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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/display
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/display')
-rw-r--r--drivers/gpu/drm/display/Kconfig51
-rw-r--r--drivers/gpu/drm/display/Makefile16
-rw-r--r--drivers/gpu/drm/display/drm_display_helper_mod.c22
-rw-r--r--drivers/gpu/drm/display/drm_dp_aux_bus.c386
-rw-r--r--drivers/gpu/drm/display/drm_dp_aux_dev.c354
-rw-r--r--drivers/gpu/drm/display/drm_dp_cec.c451
-rw-r--r--drivers/gpu/drm/display/drm_dp_dual_mode_helper.c537
-rw-r--r--drivers/gpu/drm/display/drm_dp_helper.c3893
-rw-r--r--drivers/gpu/drm/display/drm_dp_helper_internal.h33
-rw-r--r--drivers/gpu/drm/display/drm_dp_mst_topology.c5929
-rw-r--r--drivers/gpu/drm/display/drm_dp_mst_topology_internal.h24
-rw-r--r--drivers/gpu/drm/display/drm_dsc_helper.c409
-rw-r--r--drivers/gpu/drm/display/drm_hdcp_helper.c421
-rw-r--r--drivers/gpu/drm/display/drm_hdmi_helper.c197
-rw-r--r--drivers/gpu/drm/display/drm_scdc_helper.c263
15 files changed, 12986 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig
new file mode 100644
index 000000000..09712b88a
--- /dev/null
+++ b/drivers/gpu/drm/display/Kconfig
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: MIT
+
+config DRM_DP_AUX_BUS
+ tristate
+ depends on DRM
+ depends on OF || COMPILE_TEST
+
+config DRM_DISPLAY_HELPER
+ tristate
+ depends on DRM
+ help
+ DRM helpers for display adapters.
+
+config DRM_DISPLAY_DP_HELPER
+ bool
+ depends on DRM_DISPLAY_HELPER
+ help
+ DRM display helpers for DisplayPort.
+
+config DRM_DISPLAY_HDCP_HELPER
+ bool
+ depends on DRM_DISPLAY_HELPER
+ help
+ DRM display helpers for HDCP.
+
+config DRM_DISPLAY_HDMI_HELPER
+ bool
+ depends on DRM_DISPLAY_HELPER
+ help
+ DRM display helpers for HDMI.
+
+config DRM_DP_AUX_CHARDEV
+ bool "DRM DP AUX Interface"
+ depends on DRM && DRM_DISPLAY_HELPER
+ select DRM_DISPLAY_DP_HELPER
+ help
+ Choose this option to enable a /dev/drm_dp_auxN node that allows to
+ read and write values to arbitrary DPCD registers on the DP aux
+ channel.
+
+config DRM_DP_CEC
+ bool "Enable DisplayPort CEC-Tunneling-over-AUX HDMI support"
+ depends on DRM && DRM_DISPLAY_HELPER
+ select DRM_DISPLAY_DP_HELPER
+ select CEC_CORE
+ help
+ Choose this option if you want to enable HDMI CEC support for
+ DisplayPort/USB-C to HDMI adapters.
+
+ Note: not all adapters support this feature, and even for those
+ that do support this they often do not hook up the CEC pin.
diff --git a/drivers/gpu/drm/display/Makefile b/drivers/gpu/drm/display/Makefile
new file mode 100644
index 000000000..52cdda118
--- /dev/null
+++ b/drivers/gpu/drm/display/Makefile
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: MIT
+
+obj-$(CONFIG_DRM_DP_AUX_BUS) += drm_dp_aux_bus.o
+
+drm_display_helper-y := drm_display_helper_mod.o
+drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_HELPER) += drm_dp_dual_mode_helper.o \
+ drm_dp_helper.o \
+ drm_dp_mst_topology.o \
+ drm_dsc_helper.o
+drm_display_helper-$(CONFIG_DRM_DISPLAY_HDCP_HELPER) += drm_hdcp_helper.o
+drm_display_helper-$(CONFIG_DRM_DISPLAY_HDMI_HELPER) += drm_hdmi_helper.o \
+ drm_scdc_helper.o
+drm_display_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
+drm_display_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o
+
+obj-$(CONFIG_DRM_DISPLAY_HELPER) += drm_display_helper.o
diff --git a/drivers/gpu/drm/display/drm_display_helper_mod.c b/drivers/gpu/drm/display/drm_display_helper_mod.c
new file mode 100644
index 000000000..d8a6e6228
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_display_helper_mod.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: MIT
+
+#include <linux/module.h>
+
+#include "drm_dp_helper_internal.h"
+
+MODULE_DESCRIPTION("DRM display adapter helper");
+MODULE_LICENSE("GPL and additional rights");
+
+static int __init drm_display_helper_module_init(void)
+{
+ return drm_dp_aux_dev_init();
+}
+
+static void __exit drm_display_helper_module_exit(void)
+{
+ /* Call exit functions from specific dp helpers here */
+ drm_dp_aux_dev_exit();
+}
+
+module_init(drm_display_helper_module_init);
+module_exit(drm_display_helper_module_exit);
diff --git a/drivers/gpu/drm/display/drm_dp_aux_bus.c b/drivers/gpu/drm/display/drm_dp_aux_bus.c
new file mode 100644
index 000000000..f5741b45c
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_aux_bus.c
@@ -0,0 +1,386 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2021 Google Inc.
+ *
+ * The DP AUX bus is used for devices that are connected over a DisplayPort
+ * AUX bus. The device on the far side of the bus is referred to as an
+ * endpoint in this code.
+ *
+ * There is only one device connected to the DP AUX bus: an eDP panel.
+ * Though historically panels (even DP panels) have been modeled as simple
+ * platform devices, putting them under the DP AUX bus allows the panel driver
+ * to perform transactions on that bus.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/display/drm_dp_aux_bus.h>
+#include <drm/display/drm_dp_helper.h>
+
+struct dp_aux_ep_device_with_data {
+ struct dp_aux_ep_device aux_ep;
+ int (*done_probing)(struct drm_dp_aux *aux);
+};
+
+/**
+ * dp_aux_ep_match() - The match function for the dp_aux_bus.
+ * @dev: The device to match.
+ * @drv: The driver to try to match against.
+ *
+ * At the moment, we just match on device tree.
+ *
+ * Return: True if this driver matches this device; false otherwise.
+ */
+static int dp_aux_ep_match(struct device *dev, struct device_driver *drv)
+{
+ return !!of_match_device(drv->of_match_table, dev);
+}
+
+/**
+ * dp_aux_ep_probe() - The probe function for the dp_aux_bus.
+ * @dev: The device to probe.
+ *
+ * Calls through to the endpoint driver probe.
+ *
+ * Return: 0 if no error or negative error code.
+ */
+static int dp_aux_ep_probe(struct device *dev)
+{
+ struct dp_aux_ep_driver *aux_ep_drv = to_dp_aux_ep_drv(dev->driver);
+ struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(dev);
+ struct dp_aux_ep_device_with_data *aux_ep_with_data =
+ container_of(aux_ep, struct dp_aux_ep_device_with_data, aux_ep);
+ int ret;
+
+ ret = dev_pm_domain_attach(dev, true);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to attach to PM Domain\n");
+
+ ret = aux_ep_drv->probe(aux_ep);
+ if (ret)
+ goto err_attached;
+
+ if (aux_ep_with_data->done_probing) {
+ ret = aux_ep_with_data->done_probing(aux_ep->aux);
+ if (ret) {
+ /*
+ * The done_probing() callback should not return
+ * -EPROBE_DEFER to us. If it does, we treat it as an
+ * error. Passing it on as-is would cause the _panel_
+ * to defer.
+ */
+ if (ret == -EPROBE_DEFER) {
+ dev_err(dev,
+ "DP AUX done_probing() can't defer\n");
+ ret = -EINVAL;
+ }
+ goto err_probed;
+ }
+ }
+
+ return 0;
+err_probed:
+ if (aux_ep_drv->remove)
+ aux_ep_drv->remove(aux_ep);
+err_attached:
+ dev_pm_domain_detach(dev, true);
+
+ return ret;
+}
+
+/**
+ * dp_aux_ep_remove() - The remove function for the dp_aux_bus.
+ * @dev: The device to remove.
+ *
+ * Calls through to the endpoint driver remove.
+ */
+static void dp_aux_ep_remove(struct device *dev)
+{
+ struct dp_aux_ep_driver *aux_ep_drv = to_dp_aux_ep_drv(dev->driver);
+ struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(dev);
+
+ if (aux_ep_drv->remove)
+ aux_ep_drv->remove(aux_ep);
+ dev_pm_domain_detach(dev, true);
+}
+
+/**
+ * dp_aux_ep_shutdown() - The shutdown function for the dp_aux_bus.
+ * @dev: The device to shutdown.
+ *
+ * Calls through to the endpoint driver shutdown.
+ */
+static void dp_aux_ep_shutdown(struct device *dev)
+{
+ struct dp_aux_ep_driver *aux_ep_drv;
+
+ if (!dev->driver)
+ return;
+
+ aux_ep_drv = to_dp_aux_ep_drv(dev->driver);
+ if (aux_ep_drv->shutdown)
+ aux_ep_drv->shutdown(to_dp_aux_ep_dev(dev));
+}
+
+static struct bus_type dp_aux_bus_type = {
+ .name = "dp-aux",
+ .match = dp_aux_ep_match,
+ .probe = dp_aux_ep_probe,
+ .remove = dp_aux_ep_remove,
+ .shutdown = dp_aux_ep_shutdown,
+};
+
+static ssize_t modalias_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return of_device_modalias(dev, buf, PAGE_SIZE);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *dp_aux_ep_dev_attrs[] = {
+ &dev_attr_modalias.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(dp_aux_ep_dev);
+
+/**
+ * dp_aux_ep_dev_release() - Free memory for the dp_aux_ep device
+ * @dev: The device to free.
+ */
+static void dp_aux_ep_dev_release(struct device *dev)
+{
+ struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(dev);
+ struct dp_aux_ep_device_with_data *aux_ep_with_data =
+ container_of(aux_ep, struct dp_aux_ep_device_with_data, aux_ep);
+
+ kfree(aux_ep_with_data);
+}
+
+static struct device_type dp_aux_device_type_type = {
+ .groups = dp_aux_ep_dev_groups,
+ .uevent = of_device_uevent_modalias,
+ .release = dp_aux_ep_dev_release,
+};
+
+/**
+ * of_dp_aux_ep_destroy() - Destroy an DP AUX endpoint device
+ * @dev: The device to destroy.
+ * @data: Not used
+ *
+ * This is just used as a callback by of_dp_aux_depopulate_bus() and
+ * is called for _all_ of the child devices of the device providing the AUX bus.
+ * We'll only act on those that are of type "dp_aux_bus_type".
+ *
+ * This function is effectively an inverse of what's in
+ * of_dp_aux_populate_bus(). NOTE: since we only populate one child
+ * then it's expected that only one device will match all the "if" tests in
+ * this function and get to the device_unregister().
+ *
+ * Return: 0 if no error or negative error code.
+ */
+static int of_dp_aux_ep_destroy(struct device *dev, void *data)
+{
+ struct device_node *np = dev->of_node;
+
+ if (dev->bus != &dp_aux_bus_type)
+ return 0;
+
+ if (!of_node_check_flag(np, OF_POPULATED))
+ return 0;
+
+ of_node_clear_flag(np, OF_POPULATED);
+ of_node_put(np);
+
+ device_unregister(dev);
+
+ return 0;
+}
+
+/**
+ * of_dp_aux_depopulate_bus() - Undo of_dp_aux_populate_bus
+ * @aux: The AUX channel whose device we want to depopulate
+ *
+ * This will destroy the device that was created
+ * by of_dp_aux_populate_bus().
+ */
+void of_dp_aux_depopulate_bus(struct drm_dp_aux *aux)
+{
+ device_for_each_child_reverse(aux->dev, NULL, of_dp_aux_ep_destroy);
+}
+EXPORT_SYMBOL_GPL(of_dp_aux_depopulate_bus);
+
+/**
+ * of_dp_aux_populate_bus() - Populate the endpoint device on the DP AUX
+ * @aux: The AUX channel whose device we want to populate. It is required that
+ * drm_dp_aux_init() has already been called for this AUX channel.
+ * @done_probing: Callback functions to call after EP device finishes probing.
+ * Will not be called if there are no EP devices and this
+ * function will return -ENODEV.
+ *
+ * This will populate the device (expected to be an eDP panel) under the
+ * "aux-bus" node of the device providing the AUX channel (AKA aux->dev).
+ *
+ * When this function finishes, it is _possible_ (but not guaranteed) that
+ * our sub-device will have finished probing. It should be noted that if our
+ * sub-device returns -EPROBE_DEFER or is probing asynchronously for some
+ * reason that we will not return any error codes ourselves but our
+ * sub-device will _not_ have actually probed successfully yet.
+ *
+ * In many cases it's important for the caller of this function to be notified
+ * when our sub device finishes probing. Our sub device is expected to be an
+ * eDP panel and the caller is expected to be an eDP controller. The eDP
+ * controller needs to be able to get a reference to the panel when it finishes
+ * probing. For this reason the caller can pass in a function pointer that
+ * will be called when our sub-device finishes probing.
+ *
+ * If this function succeeds you should later make sure you call
+ * of_dp_aux_depopulate_bus() to undo it, or just use the devm version
+ * of this function.
+ *
+ * Return: 0 if no error or negative error code; returns -ENODEV if there are
+ * no children. The done_probing() function won't be called in that
+ * case.
+ */
+int of_dp_aux_populate_bus(struct drm_dp_aux *aux,
+ int (*done_probing)(struct drm_dp_aux *aux))
+{
+ struct device_node *bus = NULL, *np = NULL;
+ struct dp_aux_ep_device *aux_ep;
+ struct dp_aux_ep_device_with_data *aux_ep_with_data;
+ int ret;
+
+ /* drm_dp_aux_init() should have been called already; warn if not */
+ WARN_ON_ONCE(!aux->ddc.algo);
+
+ if (!aux->dev->of_node)
+ return -ENODEV;
+ bus = of_get_child_by_name(aux->dev->of_node, "aux-bus");
+ if (!bus)
+ return -ENODEV;
+
+ np = of_get_next_available_child(bus, NULL);
+ of_node_put(bus);
+ if (!np)
+ return -ENODEV;
+
+ if (of_node_test_and_set_flag(np, OF_POPULATED)) {
+ dev_err(aux->dev, "DP AUX EP device already populated\n");
+ ret = -EINVAL;
+ goto err_did_get_np;
+ }
+
+ aux_ep_with_data = kzalloc(sizeof(*aux_ep_with_data), GFP_KERNEL);
+ if (!aux_ep_with_data) {
+ ret = -ENOMEM;
+ goto err_did_set_populated;
+ }
+
+ aux_ep_with_data->done_probing = done_probing;
+
+ aux_ep = &aux_ep_with_data->aux_ep;
+ aux_ep->aux = aux;
+ aux_ep->dev.parent = aux->dev;
+ aux_ep->dev.bus = &dp_aux_bus_type;
+ aux_ep->dev.type = &dp_aux_device_type_type;
+ aux_ep->dev.of_node = of_node_get(np);
+ dev_set_name(&aux_ep->dev, "aux-%s", dev_name(aux->dev));
+
+ ret = device_register(&aux_ep->dev);
+ if (ret) {
+ dev_err(aux->dev, "Failed to create AUX EP for %pOF: %d\n", np, ret);
+
+ /*
+ * As per docs of device_register(), call this instead
+ * of kfree() directly for error cases.
+ */
+ put_device(&aux_ep->dev);
+
+ goto err_did_set_populated;
+ }
+
+ return 0;
+
+err_did_set_populated:
+ of_node_clear_flag(np, OF_POPULATED);
+
+err_did_get_np:
+ of_node_put(np);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_dp_aux_populate_bus);
+
+static void of_dp_aux_depopulate_bus_void(void *data)
+{
+ of_dp_aux_depopulate_bus(data);
+}
+
+/**
+ * devm_of_dp_aux_populate_bus() - devm wrapper for of_dp_aux_populate_bus()
+ * @aux: The AUX channel whose device we want to populate
+ * @done_probing: Callback functions to call after EP device finishes probing.
+ * Will not be called if there are no EP devices and this
+ * function will return -ENODEV.
+ *
+ * Handles freeing w/ devm on the device "aux->dev".
+ *
+ * Return: 0 if no error or negative error code; returns -ENODEV if there are
+ * no children. The done_probing() function won't be called in that
+ * case.
+ */
+int devm_of_dp_aux_populate_bus(struct drm_dp_aux *aux,
+ int (*done_probing)(struct drm_dp_aux *aux))
+{
+ int ret;
+
+ ret = of_dp_aux_populate_bus(aux, done_probing);
+ if (ret)
+ return ret;
+
+ return devm_add_action_or_reset(aux->dev,
+ of_dp_aux_depopulate_bus_void, aux);
+}
+EXPORT_SYMBOL_GPL(devm_of_dp_aux_populate_bus);
+
+int __dp_aux_dp_driver_register(struct dp_aux_ep_driver *drv, struct module *owner)
+{
+ drv->driver.owner = owner;
+ drv->driver.bus = &dp_aux_bus_type;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(__dp_aux_dp_driver_register);
+
+void dp_aux_dp_driver_unregister(struct dp_aux_ep_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(dp_aux_dp_driver_unregister);
+
+static int __init dp_aux_bus_init(void)
+{
+ int ret;
+
+ ret = bus_register(&dp_aux_bus_type);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void __exit dp_aux_bus_exit(void)
+{
+ bus_unregister(&dp_aux_bus_type);
+}
+
+subsys_initcall(dp_aux_bus_init);
+module_exit(dp_aux_bus_exit);
+
+MODULE_AUTHOR("Douglas Anderson <dianders@chromium.org>");
+MODULE_DESCRIPTION("DRM DisplayPort AUX bus");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/display/drm_dp_aux_dev.c b/drivers/gpu/drm/display/drm_dp_aux_dev.c
new file mode 100644
index 000000000..098e482e6
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_aux_dev.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Rafael Antognolli <rafael.antognolli@intel.com>
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/uio.h>
+
+#include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_dp_mst_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_print.h>
+
+#include "drm_dp_helper_internal.h"
+
+struct drm_dp_aux_dev {
+ unsigned index;
+ struct drm_dp_aux *aux;
+ struct device *dev;
+ struct kref refcount;
+ atomic_t usecount;
+};
+
+#define DRM_AUX_MINORS 256
+#define AUX_MAX_OFFSET (1 << 20)
+static DEFINE_IDR(aux_idr);
+static DEFINE_MUTEX(aux_idr_mutex);
+static struct class *drm_dp_aux_dev_class;
+static int drm_dev_major = -1;
+
+static struct drm_dp_aux_dev *drm_dp_aux_dev_get_by_minor(unsigned index)
+{
+ struct drm_dp_aux_dev *aux_dev = NULL;
+
+ mutex_lock(&aux_idr_mutex);
+ aux_dev = idr_find(&aux_idr, index);
+ if (aux_dev && !kref_get_unless_zero(&aux_dev->refcount))
+ aux_dev = NULL;
+ mutex_unlock(&aux_idr_mutex);
+
+ return aux_dev;
+}
+
+static struct drm_dp_aux_dev *alloc_drm_dp_aux_dev(struct drm_dp_aux *aux)
+{
+ struct drm_dp_aux_dev *aux_dev;
+ int index;
+
+ aux_dev = kzalloc(sizeof(*aux_dev), GFP_KERNEL);
+ if (!aux_dev)
+ return ERR_PTR(-ENOMEM);
+ aux_dev->aux = aux;
+ atomic_set(&aux_dev->usecount, 1);
+ kref_init(&aux_dev->refcount);
+
+ mutex_lock(&aux_idr_mutex);
+ index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);
+ mutex_unlock(&aux_idr_mutex);
+ if (index < 0) {
+ kfree(aux_dev);
+ return ERR_PTR(index);
+ }
+ aux_dev->index = index;
+
+ return aux_dev;
+}
+
+static void release_drm_dp_aux_dev(struct kref *ref)
+{
+ struct drm_dp_aux_dev *aux_dev =
+ container_of(ref, struct drm_dp_aux_dev, refcount);
+
+ kfree(aux_dev);
+}
+
+static ssize_t name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ ssize_t res;
+ struct drm_dp_aux_dev *aux_dev =
+ drm_dp_aux_dev_get_by_minor(MINOR(dev->devt));
+
+ if (!aux_dev)
+ return -ENODEV;
+
+ res = sprintf(buf, "%s\n", aux_dev->aux->name);
+ kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
+
+ return res;
+}
+static DEVICE_ATTR_RO(name);
+
+static struct attribute *drm_dp_aux_attrs[] = {
+ &dev_attr_name.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(drm_dp_aux);
+
+static int auxdev_open(struct inode *inode, struct file *file)
+{
+ unsigned int minor = iminor(inode);
+ struct drm_dp_aux_dev *aux_dev;
+
+ aux_dev = drm_dp_aux_dev_get_by_minor(minor);
+ if (!aux_dev)
+ return -ENODEV;
+
+ file->private_data = aux_dev;
+ return 0;
+}
+
+static loff_t auxdev_llseek(struct file *file, loff_t offset, int whence)
+{
+ return fixed_size_llseek(file, offset, whence, AUX_MAX_OFFSET);
+}
+
+static ssize_t auxdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
+ loff_t pos = iocb->ki_pos;
+ ssize_t res = 0;
+
+ if (!atomic_inc_not_zero(&aux_dev->usecount))
+ return -ENODEV;
+
+ iov_iter_truncate(to, AUX_MAX_OFFSET - pos);
+
+ while (iov_iter_count(to)) {
+ uint8_t buf[DP_AUX_MAX_PAYLOAD_BYTES];
+ ssize_t todo = min(iov_iter_count(to), sizeof(buf));
+
+ if (signal_pending(current)) {
+ res = -ERESTARTSYS;
+ break;
+ }
+
+ res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);
+
+ if (res <= 0)
+ break;
+
+ if (copy_to_iter(buf, res, to) != res) {
+ res = -EFAULT;
+ break;
+ }
+
+ pos += res;
+ }
+
+ if (pos != iocb->ki_pos)
+ res = pos - iocb->ki_pos;
+ iocb->ki_pos = pos;
+
+ if (atomic_dec_and_test(&aux_dev->usecount))
+ wake_up_var(&aux_dev->usecount);
+
+ return res;
+}
+
+static ssize_t auxdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;
+ loff_t pos = iocb->ki_pos;
+ ssize_t res = 0;
+
+ if (!atomic_inc_not_zero(&aux_dev->usecount))
+ return -ENODEV;
+
+ iov_iter_truncate(from, AUX_MAX_OFFSET - pos);
+
+ while (iov_iter_count(from)) {
+ uint8_t buf[DP_AUX_MAX_PAYLOAD_BYTES];
+ ssize_t todo = min(iov_iter_count(from), sizeof(buf));
+
+ if (signal_pending(current)) {
+ res = -ERESTARTSYS;
+ break;
+ }
+
+ if (!copy_from_iter_full(buf, todo, from)) {
+ res = -EFAULT;
+ break;
+ }
+
+ res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);
+
+ if (res <= 0)
+ break;
+
+ pos += res;
+ }
+
+ if (pos != iocb->ki_pos)
+ res = pos - iocb->ki_pos;
+ iocb->ki_pos = pos;
+
+ if (atomic_dec_and_test(&aux_dev->usecount))
+ wake_up_var(&aux_dev->usecount);
+
+ return res;
+}
+
+static int auxdev_release(struct inode *inode, struct file *file)
+{
+ struct drm_dp_aux_dev *aux_dev = file->private_data;
+
+ kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
+ return 0;
+}
+
+static const struct file_operations auxdev_fops = {
+ .owner = THIS_MODULE,
+ .llseek = auxdev_llseek,
+ .read_iter = auxdev_read_iter,
+ .write_iter = auxdev_write_iter,
+ .open = auxdev_open,
+ .release = auxdev_release,
+};
+
+#define to_auxdev(d) container_of(d, struct drm_dp_aux_dev, aux)
+
+static struct drm_dp_aux_dev *drm_dp_aux_dev_get_by_aux(struct drm_dp_aux *aux)
+{
+ struct drm_dp_aux_dev *iter, *aux_dev = NULL;
+ int id;
+
+ /* don't increase kref count here because this function should only be
+ * used by drm_dp_aux_unregister_devnode. Thus, it will always have at
+ * least one reference - the one that drm_dp_aux_register_devnode
+ * created
+ */
+ mutex_lock(&aux_idr_mutex);
+ idr_for_each_entry(&aux_idr, iter, id) {
+ if (iter->aux == aux) {
+ aux_dev = iter;
+ break;
+ }
+ }
+ mutex_unlock(&aux_idr_mutex);
+ return aux_dev;
+}
+
+void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
+{
+ struct drm_dp_aux_dev *aux_dev;
+ unsigned int minor;
+
+ aux_dev = drm_dp_aux_dev_get_by_aux(aux);
+ if (!aux_dev) /* attach must have failed */
+ return;
+
+ /*
+ * As some AUX adapters may exist as platform devices which outlive their respective DRM
+ * devices, we clear drm_dev to ensure that we never accidentally reference a stale pointer
+ */
+ aux->drm_dev = NULL;
+
+ mutex_lock(&aux_idr_mutex);
+ idr_remove(&aux_idr, aux_dev->index);
+ mutex_unlock(&aux_idr_mutex);
+
+ atomic_dec(&aux_dev->usecount);
+ wait_var_event(&aux_dev->usecount, !atomic_read(&aux_dev->usecount));
+
+ minor = aux_dev->index;
+ if (aux_dev->dev)
+ device_destroy(drm_dp_aux_dev_class,
+ MKDEV(drm_dev_major, minor));
+
+ DRM_DEBUG("drm_dp_aux_dev: aux [%s] unregistering\n", aux->name);
+ kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);
+}
+
+int drm_dp_aux_register_devnode(struct drm_dp_aux *aux)
+{
+ struct drm_dp_aux_dev *aux_dev;
+ int res;
+
+ aux_dev = alloc_drm_dp_aux_dev(aux);
+ if (IS_ERR(aux_dev))
+ return PTR_ERR(aux_dev);
+
+ aux_dev->dev = device_create(drm_dp_aux_dev_class, aux->dev,
+ MKDEV(drm_dev_major, aux_dev->index), NULL,
+ "drm_dp_aux%d", aux_dev->index);
+ if (IS_ERR(aux_dev->dev)) {
+ res = PTR_ERR(aux_dev->dev);
+ aux_dev->dev = NULL;
+ goto error;
+ }
+
+ DRM_DEBUG("drm_dp_aux_dev: aux [%s] registered as minor %d\n",
+ aux->name, aux_dev->index);
+ return 0;
+error:
+ drm_dp_aux_unregister_devnode(aux);
+ return res;
+}
+
+int drm_dp_aux_dev_init(void)
+{
+ int res;
+
+ drm_dp_aux_dev_class = class_create(THIS_MODULE, "drm_dp_aux_dev");
+ if (IS_ERR(drm_dp_aux_dev_class)) {
+ return PTR_ERR(drm_dp_aux_dev_class);
+ }
+ drm_dp_aux_dev_class->dev_groups = drm_dp_aux_groups;
+
+ res = register_chrdev(0, "aux", &auxdev_fops);
+ if (res < 0)
+ goto out;
+ drm_dev_major = res;
+
+ return 0;
+out:
+ class_destroy(drm_dp_aux_dev_class);
+ return res;
+}
+
+void drm_dp_aux_dev_exit(void)
+{
+ unregister_chrdev(drm_dev_major, "aux");
+ class_destroy(drm_dp_aux_dev_class);
+}
diff --git a/drivers/gpu/drm/display/drm_dp_cec.c b/drivers/gpu/drm/display/drm_dp_cec.c
new file mode 100644
index 000000000..ae39dc794
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_cec.c
@@ -0,0 +1,451 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DisplayPort CEC-Tunneling-over-AUX support
+ *
+ * Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <media/cec.h>
+
+#include <drm/display/drm_dp_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_device.h>
+
+/*
+ * Unfortunately it turns out that we have a chicken-and-egg situation
+ * here. Quite a few active (mini-)DP-to-HDMI or USB-C-to-HDMI adapters
+ * have a converter chip that supports CEC-Tunneling-over-AUX (usually the
+ * Parade PS176), but they do not wire up the CEC pin, thus making CEC
+ * useless. Note that MegaChips 2900-based adapters appear to have good
+ * support for CEC tunneling. Those adapters that I have tested using
+ * this chipset all have the CEC line connected.
+ *
+ * Sadly there is no way for this driver to know this. What happens is
+ * that a /dev/cecX device is created that is isolated and unable to see
+ * any of the other CEC devices. Quite literally the CEC wire is cut
+ * (or in this case, never connected in the first place).
+ *
+ * The reason so few adapters support this is that this tunneling protocol
+ * was never supported by any OS. So there was no easy way of testing it,
+ * and no incentive to correctly wire up the CEC pin.
+ *
+ * Hopefully by creating this driver it will be easier for vendors to
+ * finally fix their adapters and test the CEC functionality.
+ *
+ * I keep a list of known working adapters here:
+ *
+ * https://hverkuil.home.xs4all.nl/cec-status.txt
+ *
+ * Please mail me (hverkuil@xs4all.nl) if you find an adapter that works
+ * and is not yet listed there.
+ *
+ * Note that the current implementation does not support CEC over an MST hub.
+ * As far as I can see there is no mechanism defined in the DisplayPort
+ * standard to transport CEC interrupts over an MST device. It might be
+ * possible to do this through polling, but I have not been able to get that
+ * to work.
+ */
+
+/**
+ * DOC: dp cec helpers
+ *
+ * These functions take care of supporting the CEC-Tunneling-over-AUX
+ * feature of DisplayPort-to-HDMI adapters.
+ */
+
+/*
+ * When the EDID is unset because the HPD went low, then the CEC DPCD registers
+ * typically can no longer be read (true for a DP-to-HDMI adapter since it is
+ * powered by the HPD). However, some displays toggle the HPD off and on for a
+ * short period for one reason or another, and that would cause the CEC adapter
+ * to be removed and added again, even though nothing else changed.
+ *
+ * This module parameter sets a delay in seconds before the CEC adapter is
+ * actually unregistered. Only if the HPD does not return within that time will
+ * the CEC adapter be unregistered.
+ *
+ * If it is set to a value >= NEVER_UNREG_DELAY, then the CEC adapter will never
+ * be unregistered for as long as the connector remains registered.
+ *
+ * If it is set to 0, then the CEC adapter will be unregistered immediately as
+ * soon as the HPD disappears.
+ *
+ * The default is one second to prevent short HPD glitches from unregistering
+ * the CEC adapter.
+ *
+ * Note that for integrated HDMI branch devices that support CEC the DPCD
+ * registers remain available even if the HPD goes low since it is not powered
+ * by the HPD. In that case the CEC adapter will never be unregistered during
+ * the life time of the connector. At least, this is the theory since I do not
+ * have hardware with an integrated HDMI branch device that supports CEC.
+ */
+#define NEVER_UNREG_DELAY 1000
+static unsigned int drm_dp_cec_unregister_delay = 1;
+module_param(drm_dp_cec_unregister_delay, uint, 0600);
+MODULE_PARM_DESC(drm_dp_cec_unregister_delay,
+ "CEC unregister delay in seconds, 0: no delay, >= 1000: never unregister");
+
+static int drm_dp_cec_adap_enable(struct cec_adapter *adap, bool enable)
+{
+ struct drm_dp_aux *aux = cec_get_drvdata(adap);
+ u32 val = enable ? DP_CEC_TUNNELING_ENABLE : 0;
+ ssize_t err = 0;
+
+ err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
+ return (enable && err < 0) ? err : 0;
+}
+
+static int drm_dp_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
+{
+ struct drm_dp_aux *aux = cec_get_drvdata(adap);
+ /* Bit 15 (logical address 15) should always be set */
+ u16 la_mask = 1 << CEC_LOG_ADDR_BROADCAST;
+ u8 mask[2];
+ ssize_t err;
+
+ if (addr != CEC_LOG_ADDR_INVALID)
+ la_mask |= adap->log_addrs.log_addr_mask | (1 << addr);
+ mask[0] = la_mask & 0xff;
+ mask[1] = la_mask >> 8;
+ err = drm_dp_dpcd_write(aux, DP_CEC_LOGICAL_ADDRESS_MASK, mask, 2);
+ return (addr != CEC_LOG_ADDR_INVALID && err < 0) ? err : 0;
+}
+
+static int drm_dp_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
+ u32 signal_free_time, struct cec_msg *msg)
+{
+ struct drm_dp_aux *aux = cec_get_drvdata(adap);
+ unsigned int retries = min(5, attempts - 1);
+ ssize_t err;
+
+ err = drm_dp_dpcd_write(aux, DP_CEC_TX_MESSAGE_BUFFER,
+ msg->msg, msg->len);
+ if (err < 0)
+ return err;
+
+ err = drm_dp_dpcd_writeb(aux, DP_CEC_TX_MESSAGE_INFO,
+ (msg->len - 1) | (retries << 4) |
+ DP_CEC_TX_MESSAGE_SEND);
+ return err < 0 ? err : 0;
+}
+
+static int drm_dp_cec_adap_monitor_all_enable(struct cec_adapter *adap,
+ bool enable)
+{
+ struct drm_dp_aux *aux = cec_get_drvdata(adap);
+ ssize_t err;
+ u8 val;
+
+ if (!(adap->capabilities & CEC_CAP_MONITOR_ALL))
+ return 0;
+
+ err = drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CONTROL, &val);
+ if (err >= 0) {
+ if (enable)
+ val |= DP_CEC_SNOOPING_ENABLE;
+ else
+ val &= ~DP_CEC_SNOOPING_ENABLE;
+ err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
+ }
+ return (enable && err < 0) ? err : 0;
+}
+
+static void drm_dp_cec_adap_status(struct cec_adapter *adap,
+ struct seq_file *file)
+{
+ struct drm_dp_aux *aux = cec_get_drvdata(adap);
+ struct drm_dp_desc desc;
+ struct drm_dp_dpcd_ident *id = &desc.ident;
+
+ if (drm_dp_read_desc(aux, &desc, true))
+ return;
+ seq_printf(file, "OUI: %*phD\n",
+ (int)sizeof(id->oui), id->oui);
+ seq_printf(file, "ID: %*pE\n",
+ (int)strnlen(id->device_id, sizeof(id->device_id)),
+ id->device_id);
+ seq_printf(file, "HW Rev: %d.%d\n", id->hw_rev >> 4, id->hw_rev & 0xf);
+ /*
+ * Show this both in decimal and hex: at least one vendor
+ * always reports this in hex.
+ */
+ seq_printf(file, "FW/SW Rev: %d.%d (0x%02x.0x%02x)\n",
+ id->sw_major_rev, id->sw_minor_rev,
+ id->sw_major_rev, id->sw_minor_rev);
+}
+
+static const struct cec_adap_ops drm_dp_cec_adap_ops = {
+ .adap_enable = drm_dp_cec_adap_enable,
+ .adap_log_addr = drm_dp_cec_adap_log_addr,
+ .adap_transmit = drm_dp_cec_adap_transmit,
+ .adap_monitor_all_enable = drm_dp_cec_adap_monitor_all_enable,
+ .adap_status = drm_dp_cec_adap_status,
+};
+
+static int drm_dp_cec_received(struct drm_dp_aux *aux)
+{
+ struct cec_adapter *adap = aux->cec.adap;
+ struct cec_msg msg;
+ u8 rx_msg_info;
+ ssize_t err;
+
+ err = drm_dp_dpcd_readb(aux, DP_CEC_RX_MESSAGE_INFO, &rx_msg_info);
+ if (err < 0)
+ return err;
+
+ if (!(rx_msg_info & DP_CEC_RX_MESSAGE_ENDED))
+ return 0;
+
+ msg.len = (rx_msg_info & DP_CEC_RX_MESSAGE_LEN_MASK) + 1;
+ err = drm_dp_dpcd_read(aux, DP_CEC_RX_MESSAGE_BUFFER, msg.msg, msg.len);
+ if (err < 0)
+ return err;
+
+ cec_received_msg(adap, &msg);
+ return 0;
+}
+
+static void drm_dp_cec_handle_irq(struct drm_dp_aux *aux)
+{
+ struct cec_adapter *adap = aux->cec.adap;
+ u8 flags;
+
+ if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, &flags) < 0)
+ return;
+
+ if (flags & DP_CEC_RX_MESSAGE_INFO_VALID)
+ drm_dp_cec_received(aux);
+
+ if (flags & DP_CEC_TX_MESSAGE_SENT)
+ cec_transmit_attempt_done(adap, CEC_TX_STATUS_OK);
+ else if (flags & DP_CEC_TX_LINE_ERROR)
+ cec_transmit_attempt_done(adap, CEC_TX_STATUS_ERROR |
+ CEC_TX_STATUS_MAX_RETRIES);
+ else if (flags &
+ (DP_CEC_TX_ADDRESS_NACK_ERROR | DP_CEC_TX_DATA_NACK_ERROR))
+ cec_transmit_attempt_done(adap, CEC_TX_STATUS_NACK |
+ CEC_TX_STATUS_MAX_RETRIES);
+ drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, flags);
+}
+
+/**
+ * drm_dp_cec_irq() - handle CEC interrupt, if any
+ * @aux: DisplayPort AUX channel
+ *
+ * Should be called when handling an IRQ_HPD request. If CEC-tunneling-over-AUX
+ * is present, then it will check for a CEC_IRQ and handle it accordingly.
+ */
+void drm_dp_cec_irq(struct drm_dp_aux *aux)
+{
+ u8 cec_irq;
+ int ret;
+
+ /* No transfer function was set, so not a DP connector */
+ if (!aux->transfer)
+ return;
+
+ mutex_lock(&aux->cec.lock);
+ if (!aux->cec.adap)
+ goto unlock;
+
+ ret = drm_dp_dpcd_readb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1,
+ &cec_irq);
+ if (ret < 0 || !(cec_irq & DP_CEC_IRQ))
+ goto unlock;
+
+ drm_dp_cec_handle_irq(aux);
+ drm_dp_dpcd_writeb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1, DP_CEC_IRQ);
+unlock:
+ mutex_unlock(&aux->cec.lock);
+}
+EXPORT_SYMBOL(drm_dp_cec_irq);
+
+static bool drm_dp_cec_cap(struct drm_dp_aux *aux, u8 *cec_cap)
+{
+ u8 cap = 0;
+
+ if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CAPABILITY, &cap) != 1 ||
+ !(cap & DP_CEC_TUNNELING_CAPABLE))
+ return false;
+ if (cec_cap)
+ *cec_cap = cap;
+ return true;
+}
+
+/*
+ * Called if the HPD was low for more than drm_dp_cec_unregister_delay
+ * seconds. This unregisters the CEC adapter.
+ */
+static void drm_dp_cec_unregister_work(struct work_struct *work)
+{
+ struct drm_dp_aux *aux = container_of(work, struct drm_dp_aux,
+ cec.unregister_work.work);
+
+ mutex_lock(&aux->cec.lock);
+ cec_unregister_adapter(aux->cec.adap);
+ aux->cec.adap = NULL;
+ mutex_unlock(&aux->cec.lock);
+}
+
+/*
+ * A new EDID is set. If there is no CEC adapter, then create one. If
+ * there was a CEC adapter, then check if the CEC adapter properties
+ * were unchanged and just update the CEC physical address. Otherwise
+ * unregister the old CEC adapter and create a new one.
+ */
+void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
+{
+ struct drm_connector *connector = aux->cec.connector;
+ u32 cec_caps = CEC_CAP_DEFAULTS | CEC_CAP_NEEDS_HPD |
+ CEC_CAP_CONNECTOR_INFO;
+ struct cec_connector_info conn_info;
+ unsigned int num_las = 1;
+ u8 cap;
+
+ /* No transfer function was set, so not a DP connector */
+ if (!aux->transfer)
+ return;
+
+#ifndef CONFIG_MEDIA_CEC_RC
+ /*
+ * CEC_CAP_RC is part of CEC_CAP_DEFAULTS, but it is stripped by
+ * cec_allocate_adapter() if CONFIG_MEDIA_CEC_RC is undefined.
+ *
+ * Do this here as well to ensure the tests against cec_caps are
+ * correct.
+ */
+ cec_caps &= ~CEC_CAP_RC;
+#endif
+ cancel_delayed_work_sync(&aux->cec.unregister_work);
+
+ mutex_lock(&aux->cec.lock);
+ if (!drm_dp_cec_cap(aux, &cap)) {
+ /* CEC is not supported, unregister any existing adapter */
+ cec_unregister_adapter(aux->cec.adap);
+ aux->cec.adap = NULL;
+ goto unlock;
+ }
+
+ if (cap & DP_CEC_SNOOPING_CAPABLE)
+ cec_caps |= CEC_CAP_MONITOR_ALL;
+ if (cap & DP_CEC_MULTIPLE_LA_CAPABLE)
+ num_las = CEC_MAX_LOG_ADDRS;
+
+ if (aux->cec.adap) {
+ if (aux->cec.adap->capabilities == cec_caps &&
+ aux->cec.adap->available_log_addrs == num_las) {
+ /* Unchanged, so just set the phys addr */
+ cec_s_phys_addr_from_edid(aux->cec.adap, edid);
+ goto unlock;
+ }
+ /*
+ * The capabilities changed, so unregister the old
+ * adapter first.
+ */
+ cec_unregister_adapter(aux->cec.adap);
+ }
+
+ /* Create a new adapter */
+ aux->cec.adap = cec_allocate_adapter(&drm_dp_cec_adap_ops,
+ aux, connector->name, cec_caps,
+ num_las);
+ if (IS_ERR(aux->cec.adap)) {
+ aux->cec.adap = NULL;
+ goto unlock;
+ }
+
+ cec_fill_conn_info_from_drm(&conn_info, connector);
+ cec_s_conn_info(aux->cec.adap, &conn_info);
+
+ if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
+ cec_delete_adapter(aux->cec.adap);
+ aux->cec.adap = NULL;
+ } else {
+ /*
+ * Update the phys addr for the new CEC adapter. When called
+ * from drm_dp_cec_register_connector() edid == NULL, so in
+ * that case the phys addr is just invalidated.
+ */
+ cec_s_phys_addr_from_edid(aux->cec.adap, edid);
+ }
+unlock:
+ mutex_unlock(&aux->cec.lock);
+}
+EXPORT_SYMBOL(drm_dp_cec_set_edid);
+
+/*
+ * The EDID disappeared (likely because of the HPD going down).
+ */
+void drm_dp_cec_unset_edid(struct drm_dp_aux *aux)
+{
+ /* No transfer function was set, so not a DP connector */
+ if (!aux->transfer)
+ return;
+
+ cancel_delayed_work_sync(&aux->cec.unregister_work);
+
+ mutex_lock(&aux->cec.lock);
+ if (!aux->cec.adap)
+ goto unlock;
+
+ cec_phys_addr_invalidate(aux->cec.adap);
+ /*
+ * We're done if we want to keep the CEC device
+ * (drm_dp_cec_unregister_delay is >= NEVER_UNREG_DELAY) or if the
+ * DPCD still indicates the CEC capability (expected for an integrated
+ * HDMI branch device).
+ */
+ if (drm_dp_cec_unregister_delay < NEVER_UNREG_DELAY &&
+ !drm_dp_cec_cap(aux, NULL)) {
+ /*
+ * Unregister the CEC adapter after drm_dp_cec_unregister_delay
+ * seconds. This to debounce short HPD off-and-on cycles from
+ * displays.
+ */
+ schedule_delayed_work(&aux->cec.unregister_work,
+ drm_dp_cec_unregister_delay * HZ);
+ }
+unlock:
+ mutex_unlock(&aux->cec.lock);
+}
+EXPORT_SYMBOL(drm_dp_cec_unset_edid);
+
+/**
+ * drm_dp_cec_register_connector() - register a new connector
+ * @aux: DisplayPort AUX channel
+ * @connector: drm connector
+ *
+ * A new connector was registered with associated CEC adapter name and
+ * CEC adapter parent device. After registering the name and parent
+ * drm_dp_cec_set_edid() is called to check if the connector supports
+ * CEC and to register a CEC adapter if that is the case.
+ */
+void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
+ struct drm_connector *connector)
+{
+ WARN_ON(aux->cec.adap);
+ if (WARN_ON(!aux->transfer))
+ return;
+ aux->cec.connector = connector;
+ INIT_DELAYED_WORK(&aux->cec.unregister_work,
+ drm_dp_cec_unregister_work);
+}
+EXPORT_SYMBOL(drm_dp_cec_register_connector);
+
+/**
+ * drm_dp_cec_unregister_connector() - unregister the CEC adapter, if any
+ * @aux: DisplayPort AUX channel
+ */
+void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux)
+{
+ if (!aux->cec.adap)
+ return;
+ cancel_delayed_work_sync(&aux->cec.unregister_work);
+ cec_unregister_adapter(aux->cec.adap);
+ aux->cec.adap = NULL;
+}
+EXPORT_SYMBOL(drm_dp_cec_unregister_connector);
diff --git a/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
new file mode 100644
index 000000000..bd61e2077
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
@@ -0,0 +1,537 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <drm/display/drm_dp_dual_mode_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+
+/**
+ * DOC: dp dual mode helpers
+ *
+ * Helper functions to deal with DP dual mode (aka. DP++) adaptors.
+ *
+ * Type 1:
+ * Adaptor registers (if any) and the sink DDC bus may be accessed via I2C.
+ *
+ * Type 2:
+ * Adaptor registers and sink DDC bus can be accessed either via I2C or
+ * I2C-over-AUX. Source devices may choose to implement either of these
+ * access methods.
+ */
+
+#define DP_DUAL_MODE_SLAVE_ADDRESS 0x40
+
+/**
+ * drm_dp_dual_mode_read - Read from the DP dual mode adaptor register(s)
+ * @adapter: I2C adapter for the DDC bus
+ * @offset: register offset
+ * @buffer: buffer for return data
+ * @size: sizo of the buffer
+ *
+ * Reads @size bytes from the DP dual mode adaptor registers
+ * starting at @offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure
+ */
+ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
+ u8 offset, void *buffer, size_t size)
+{
+ u8 zero = 0;
+ char *tmpbuf = NULL;
+ /*
+ * As sub-addressing is not supported by all adaptors,
+ * always explicitly read from the start and discard
+ * any bytes that come before the requested offset.
+ * This way, no matter whether the adaptor supports it
+ * or not, we'll end up reading the proper data.
+ */
+ struct i2c_msg msgs[] = {
+ {
+ .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1,
+ .buf = &zero,
+ },
+ {
+ .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
+ .flags = I2C_M_RD,
+ .len = size + offset,
+ .buf = buffer,
+ },
+ };
+ int ret;
+
+ if (offset) {
+ tmpbuf = kmalloc(size + offset, GFP_KERNEL);
+ if (!tmpbuf)
+ return -ENOMEM;
+
+ msgs[1].buf = tmpbuf;
+ }
+
+ ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
+ if (tmpbuf)
+ memcpy(buffer, tmpbuf + offset, size);
+
+ kfree(tmpbuf);
+
+ if (ret < 0)
+ return ret;
+ if (ret != ARRAY_SIZE(msgs))
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_read);
+
+/**
+ * drm_dp_dual_mode_write - Write to the DP dual mode adaptor register(s)
+ * @adapter: I2C adapter for the DDC bus
+ * @offset: register offset
+ * @buffer: buffer for write data
+ * @size: sizo of the buffer
+ *
+ * Writes @size bytes to the DP dual mode adaptor registers
+ * starting at @offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure
+ */
+ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
+ u8 offset, const void *buffer, size_t size)
+{
+ struct i2c_msg msg = {
+ .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1 + size,
+ .buf = NULL,
+ };
+ void *data;
+ int ret;
+
+ data = kmalloc(msg.len, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ msg.buf = data;
+
+ memcpy(data, &offset, 1);
+ memcpy(data + 1, buffer, size);
+
+ ret = i2c_transfer(adapter, &msg, 1);
+
+ kfree(data);
+
+ if (ret < 0)
+ return ret;
+ if (ret != 1)
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_write);
+
+static bool is_hdmi_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN])
+{
+ static const char dp_dual_mode_hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] =
+ "DP-HDMI ADAPTOR\x04";
+
+ return memcmp(hdmi_id, dp_dual_mode_hdmi_id,
+ sizeof(dp_dual_mode_hdmi_id)) == 0;
+}
+
+static bool is_type1_adaptor(uint8_t adaptor_id)
+{
+ return adaptor_id == 0 || adaptor_id == 0xff;
+}
+
+static bool is_type2_adaptor(uint8_t adaptor_id)
+{
+ return adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
+ DP_DUAL_MODE_REV_TYPE2);
+}
+
+static bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN],
+ const uint8_t adaptor_id)
+{
+ return is_hdmi_adaptor(hdmi_id) &&
+ (adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
+ DP_DUAL_MODE_TYPE_HAS_DPCD));
+}
+
+/**
+ * drm_dp_dual_mode_detect - Identify the DP dual mode adaptor
+ * @dev: &drm_device to use
+ * @adapter: I2C adapter for the DDC bus
+ *
+ * Attempt to identify the type of the DP dual mode adaptor used.
+ *
+ * Note that when the answer is @DRM_DP_DUAL_MODE_UNKNOWN it's not
+ * certain whether we're dealing with a native HDMI port or
+ * a type 1 DVI dual mode adaptor. The driver will have to use
+ * some other hardware/driver specific mechanism to make that
+ * distinction.
+ *
+ * Returns:
+ * The type of the DP dual mode adaptor used
+ */
+enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(const struct drm_device *dev,
+ struct i2c_adapter *adapter)
+{
+ char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] = {};
+ uint8_t adaptor_id = 0x00;
+ ssize_t ret;
+
+ /*
+ * Let's see if the adaptor is there the by reading the
+ * HDMI ID registers.
+ *
+ * Note that type 1 DVI adaptors are not required to implemnt
+ * any registers, and that presents a problem for detection.
+ * If the i2c transfer is nacked, we may or may not be dealing
+ * with a type 1 DVI adaptor. Some other mechanism of detecting
+ * the presence of the adaptor is required. One way would be
+ * to check the state of the CONFIG1 pin, Another method would
+ * simply require the driver to know whether the port is a DP++
+ * port or a native HDMI port. Both of these methods are entirely
+ * hardware/driver specific so we can't deal with them here.
+ */
+ ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_HDMI_ID,
+ hdmi_id, sizeof(hdmi_id));
+ drm_dbg_kms(dev, "DP dual mode HDMI ID: %*pE (err %zd)\n",
+ ret ? 0 : (int)sizeof(hdmi_id), hdmi_id, ret);
+ if (ret)
+ return DRM_DP_DUAL_MODE_UNKNOWN;
+
+ ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_ADAPTOR_ID,
+ &adaptor_id, sizeof(adaptor_id));
+ drm_dbg_kms(dev, "DP dual mode adaptor ID: %02x (err %zd)\n", adaptor_id, ret);
+ if (ret == 0) {
+ if (is_lspcon_adaptor(hdmi_id, adaptor_id))
+ return DRM_DP_DUAL_MODE_LSPCON;
+ if (is_type2_adaptor(adaptor_id)) {
+ if (is_hdmi_adaptor(hdmi_id))
+ return DRM_DP_DUAL_MODE_TYPE2_HDMI;
+ else
+ return DRM_DP_DUAL_MODE_TYPE2_DVI;
+ }
+ /*
+ * If not a proper type 1 ID, still assume type 1, but let
+ * the user know that we may have misdetected the type.
+ */
+ if (!is_type1_adaptor(adaptor_id))
+ drm_err(dev, "Unexpected DP dual mode adaptor ID %02x\n", adaptor_id);
+
+ }
+
+ if (is_hdmi_adaptor(hdmi_id))
+ return DRM_DP_DUAL_MODE_TYPE1_HDMI;
+ else
+ return DRM_DP_DUAL_MODE_TYPE1_DVI;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_detect);
+
+/**
+ * drm_dp_dual_mode_max_tmds_clock - Max TMDS clock for DP dual mode adaptor
+ * @dev: &drm_device to use
+ * @type: DP dual mode adaptor type
+ * @adapter: I2C adapter for the DDC bus
+ *
+ * Determine the max TMDS clock the adaptor supports based on the
+ * type of the dual mode adaptor and the DP_DUAL_MODE_MAX_TMDS_CLOCK
+ * register (on type2 adaptors). As some type 1 adaptors have
+ * problems with registers (see comments in drm_dp_dual_mode_detect())
+ * we don't read the register on those, instead we simply assume
+ * a 165 MHz limit based on the specification.
+ *
+ * Returns:
+ * Maximum supported TMDS clock rate for the DP dual mode adaptor in kHz.
+ */
+int drm_dp_dual_mode_max_tmds_clock(const struct drm_device *dev, enum drm_dp_dual_mode_type type,
+ struct i2c_adapter *adapter)
+{
+ uint8_t max_tmds_clock;
+ ssize_t ret;
+
+ /* native HDMI so no limit */
+ if (type == DRM_DP_DUAL_MODE_NONE)
+ return 0;
+
+ /*
+ * Type 1 adaptors are limited to 165MHz
+ * Type 2 adaptors can tells us their limit
+ */
+ if (type < DRM_DP_DUAL_MODE_TYPE2_DVI)
+ return 165000;
+
+ ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_MAX_TMDS_CLOCK,
+ &max_tmds_clock, sizeof(max_tmds_clock));
+ if (ret || max_tmds_clock == 0x00 || max_tmds_clock == 0xff) {
+ drm_dbg_kms(dev, "Failed to query max TMDS clock\n");
+ return 165000;
+ }
+
+ return max_tmds_clock * 5000 / 2;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_max_tmds_clock);
+
+/**
+ * drm_dp_dual_mode_get_tmds_output - Get the state of the TMDS output buffers in the DP dual mode adaptor
+ * @dev: &drm_device to use
+ * @type: DP dual mode adaptor type
+ * @adapter: I2C adapter for the DDC bus
+ * @enabled: current state of the TMDS output buffers
+ *
+ * Get the state of the TMDS output buffers in the adaptor. For
+ * type2 adaptors this is queried from the DP_DUAL_MODE_TMDS_OEN
+ * register. As some type 1 adaptors have problems with registers
+ * (see comments in drm_dp_dual_mode_detect()) we don't read the
+ * register on those, instead we simply assume that the buffers
+ * are always enabled.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure
+ */
+int drm_dp_dual_mode_get_tmds_output(const struct drm_device *dev,
+ enum drm_dp_dual_mode_type type, struct i2c_adapter *adapter,
+ bool *enabled)
+{
+ uint8_t tmds_oen;
+ ssize_t ret;
+
+ if (type < DRM_DP_DUAL_MODE_TYPE2_DVI) {
+ *enabled = true;
+ return 0;
+ }
+
+ ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_TMDS_OEN,
+ &tmds_oen, sizeof(tmds_oen));
+ if (ret) {
+ drm_dbg_kms(dev, "Failed to query state of TMDS output buffers\n");
+ return ret;
+ }
+
+ *enabled = !(tmds_oen & DP_DUAL_MODE_TMDS_DISABLE);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_get_tmds_output);
+
+/**
+ * drm_dp_dual_mode_set_tmds_output - Enable/disable TMDS output buffers in the DP dual mode adaptor
+ * @dev: &drm_device to use
+ * @type: DP dual mode adaptor type
+ * @adapter: I2C adapter for the DDC bus
+ * @enable: enable (as opposed to disable) the TMDS output buffers
+ *
+ * Set the state of the TMDS output buffers in the adaptor. For
+ * type2 this is set via the DP_DUAL_MODE_TMDS_OEN register.
+ * Type1 adaptors do not support any register writes.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure
+ */
+int drm_dp_dual_mode_set_tmds_output(const struct drm_device *dev, enum drm_dp_dual_mode_type type,
+ struct i2c_adapter *adapter, bool enable)
+{
+ uint8_t tmds_oen = enable ? 0 : DP_DUAL_MODE_TMDS_DISABLE;
+ ssize_t ret;
+ int retry;
+
+ if (type < DRM_DP_DUAL_MODE_TYPE2_DVI)
+ return 0;
+
+ /*
+ * LSPCON adapters in low-power state may ignore the first write, so
+ * read back and verify the written value a few times.
+ */
+ for (retry = 0; retry < 3; retry++) {
+ uint8_t tmp;
+
+ ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_TMDS_OEN,
+ &tmds_oen, sizeof(tmds_oen));
+ if (ret) {
+ drm_dbg_kms(dev, "Failed to %s TMDS output buffers (%d attempts)\n",
+ enable ? "enable" : "disable", retry + 1);
+ return ret;
+ }
+
+ ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_TMDS_OEN,
+ &tmp, sizeof(tmp));
+ if (ret) {
+ drm_dbg_kms(dev,
+ "I2C read failed during TMDS output buffer %s (%d attempts)\n",
+ enable ? "enabling" : "disabling", retry + 1);
+ return ret;
+ }
+
+ if (tmp == tmds_oen)
+ return 0;
+ }
+
+ drm_dbg_kms(dev, "I2C write value mismatch during TMDS output buffer %s\n",
+ enable ? "enabling" : "disabling");
+
+ return -EIO;
+}
+EXPORT_SYMBOL(drm_dp_dual_mode_set_tmds_output);
+
+/**
+ * drm_dp_get_dual_mode_type_name - Get the name of the DP dual mode adaptor type as a string
+ * @type: DP dual mode adaptor type
+ *
+ * Returns:
+ * String representation of the DP dual mode adaptor type
+ */
+const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type)
+{
+ switch (type) {
+ case DRM_DP_DUAL_MODE_NONE:
+ return "none";
+ case DRM_DP_DUAL_MODE_TYPE1_DVI:
+ return "type 1 DVI";
+ case DRM_DP_DUAL_MODE_TYPE1_HDMI:
+ return "type 1 HDMI";
+ case DRM_DP_DUAL_MODE_TYPE2_DVI:
+ return "type 2 DVI";
+ case DRM_DP_DUAL_MODE_TYPE2_HDMI:
+ return "type 2 HDMI";
+ case DRM_DP_DUAL_MODE_LSPCON:
+ return "lspcon";
+ default:
+ WARN_ON(type != DRM_DP_DUAL_MODE_UNKNOWN);
+ return "unknown";
+ }
+}
+EXPORT_SYMBOL(drm_dp_get_dual_mode_type_name);
+
+/**
+ * drm_lspcon_get_mode: Get LSPCON's current mode of operation by
+ * reading offset (0x80, 0x41)
+ * @dev: &drm_device to use
+ * @adapter: I2C-over-aux adapter
+ * @mode: current lspcon mode of operation output variable
+ *
+ * Returns:
+ * 0 on success, sets the current_mode value to appropriate mode
+ * -error on failure
+ */
+int drm_lspcon_get_mode(const struct drm_device *dev, struct i2c_adapter *adapter,
+ enum drm_lspcon_mode *mode)
+{
+ u8 data;
+ int ret = 0;
+ int retry;
+
+ if (!mode) {
+ drm_err(dev, "NULL input\n");
+ return -EINVAL;
+ }
+
+ /* Read Status: i2c over aux */
+ for (retry = 0; retry < 6; retry++) {
+ if (retry)
+ usleep_range(500, 1000);
+
+ ret = drm_dp_dual_mode_read(adapter,
+ DP_DUAL_MODE_LSPCON_CURRENT_MODE,
+ &data, sizeof(data));
+ if (!ret)
+ break;
+ }
+
+ if (ret < 0) {
+ drm_dbg_kms(dev, "LSPCON read(0x80, 0x41) failed\n");
+ return -EFAULT;
+ }
+
+ if (data & DP_DUAL_MODE_LSPCON_MODE_PCON)
+ *mode = DRM_LSPCON_MODE_PCON;
+ else
+ *mode = DRM_LSPCON_MODE_LS;
+ return 0;
+}
+EXPORT_SYMBOL(drm_lspcon_get_mode);
+
+/**
+ * drm_lspcon_set_mode: Change LSPCON's mode of operation by
+ * writing offset (0x80, 0x40)
+ * @dev: &drm_device to use
+ * @adapter: I2C-over-aux adapter
+ * @mode: required mode of operation
+ *
+ * Returns:
+ * 0 on success, -error on failure/timeout
+ */
+int drm_lspcon_set_mode(const struct drm_device *dev, struct i2c_adapter *adapter,
+ enum drm_lspcon_mode mode)
+{
+ u8 data = 0;
+ int ret;
+ int time_out = 200;
+ enum drm_lspcon_mode current_mode;
+
+ if (mode == DRM_LSPCON_MODE_PCON)
+ data = DP_DUAL_MODE_LSPCON_MODE_PCON;
+
+ /* Change mode */
+ ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_LSPCON_MODE_CHANGE,
+ &data, sizeof(data));
+ if (ret < 0) {
+ drm_err(dev, "LSPCON mode change failed\n");
+ return ret;
+ }
+
+ /*
+ * Confirm mode change by reading the status bit.
+ * Sometimes, it takes a while to change the mode,
+ * so wait and retry until time out or done.
+ */
+ do {
+ ret = drm_lspcon_get_mode(dev, adapter, &current_mode);
+ if (ret) {
+ drm_err(dev, "can't confirm LSPCON mode change\n");
+ return ret;
+ } else {
+ if (current_mode != mode) {
+ msleep(10);
+ time_out -= 10;
+ } else {
+ drm_dbg_kms(dev, "LSPCON mode changed to %s\n",
+ mode == DRM_LSPCON_MODE_LS ? "LS" : "PCON");
+ return 0;
+ }
+ }
+ } while (time_out);
+
+ drm_err(dev, "LSPCON mode change timed out\n");
+ return -ETIMEDOUT;
+}
+EXPORT_SYMBOL(drm_lspcon_set_mode);
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
new file mode 100644
index 000000000..16565a0a5
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -0,0 +1,3893 @@
+/*
+ * Copyright © 2009 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/string_helpers.h>
+#include <linux/dynamic_debug.h>
+
+#include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_dp_mst_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_print.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_panel.h>
+
+#include "drm_dp_helper_internal.h"
+
+DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
+ "DRM_UT_CORE",
+ "DRM_UT_DRIVER",
+ "DRM_UT_KMS",
+ "DRM_UT_PRIME",
+ "DRM_UT_ATOMIC",
+ "DRM_UT_VBL",
+ "DRM_UT_STATE",
+ "DRM_UT_LEASE",
+ "DRM_UT_DP",
+ "DRM_UT_DRMRES");
+
+struct dp_aux_backlight {
+ struct backlight_device *base;
+ struct drm_dp_aux *aux;
+ struct drm_edp_backlight_info info;
+ bool enabled;
+};
+
+/**
+ * DOC: dp helpers
+ *
+ * These functions contain some common logic and helpers at various abstraction
+ * levels to deal with Display Port sink devices and related things like DP aux
+ * channel transfers, EDID reading over DP aux channels, decoding certain DPCD
+ * blocks, ...
+ */
+
+/* Helpers for DP link training */
+static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
+{
+ return link_status[r - DP_LANE0_1_STATUS];
+}
+
+static u8 dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_LANE0_1_STATUS + (lane >> 1);
+ int s = (lane & 1) * 4;
+ u8 l = dp_link_status(link_status, i);
+
+ return (l >> s) & 0xf;
+}
+
+bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ u8 lane_align;
+ u8 lane_status;
+ int lane;
+
+ lane_align = dp_link_status(link_status,
+ DP_LANE_ALIGN_STATUS_UPDATED);
+ if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
+ return false;
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL(drm_dp_channel_eq_ok);
+
+bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ int lane;
+ u8 lane_status;
+
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if ((lane_status & DP_LANE_CR_DONE) == 0)
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL(drm_dp_clock_recovery_ok);
+
+u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
+ DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
+ u8 l = dp_link_status(link_status, i);
+
+ return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
+}
+EXPORT_SYMBOL(drm_dp_get_adjust_request_voltage);
+
+u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
+ DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
+ u8 l = dp_link_status(link_status, i);
+
+ return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+}
+EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis);
+
+/* DP 2.0 128b/132b */
+u8 drm_dp_get_adjust_tx_ffe_preset(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane)
+{
+ int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
+ int s = ((lane & 1) ?
+ DP_ADJUST_TX_FFE_PRESET_LANE1_SHIFT :
+ DP_ADJUST_TX_FFE_PRESET_LANE0_SHIFT);
+ u8 l = dp_link_status(link_status, i);
+
+ return (l >> s) & 0xf;
+}
+EXPORT_SYMBOL(drm_dp_get_adjust_tx_ffe_preset);
+
+/* DP 2.0 errata for 128b/132b */
+bool drm_dp_128b132b_lane_channel_eq_done(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ u8 lane_align, lane_status;
+ int lane;
+
+ lane_align = dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED);
+ if (!(lane_align & DP_INTERLANE_ALIGN_DONE))
+ return false;
+
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if (!(lane_status & DP_LANE_CHANNEL_EQ_DONE))
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_lane_channel_eq_done);
+
+/* DP 2.0 errata for 128b/132b */
+bool drm_dp_128b132b_lane_symbol_locked(const u8 link_status[DP_LINK_STATUS_SIZE],
+ int lane_count)
+{
+ u8 lane_status;
+ int lane;
+
+ for (lane = 0; lane < lane_count; lane++) {
+ lane_status = dp_get_lane_status(link_status, lane);
+ if (!(lane_status & DP_LANE_SYMBOL_LOCKED))
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_lane_symbol_locked);
+
+/* DP 2.0 errata for 128b/132b */
+bool drm_dp_128b132b_eq_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ u8 status = dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED);
+
+ return status & DP_128B132B_DPRX_EQ_INTERLANE_ALIGN_DONE;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_eq_interlane_align_done);
+
+/* DP 2.0 errata for 128b/132b */
+bool drm_dp_128b132b_cds_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ u8 status = dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED);
+
+ return status & DP_128B132B_DPRX_CDS_INTERLANE_ALIGN_DONE;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_cds_interlane_align_done);
+
+/* DP 2.0 errata for 128b/132b */
+bool drm_dp_128b132b_link_training_failed(const u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ u8 status = dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED);
+
+ return status & DP_128B132B_LT_FAILED;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_link_training_failed);
+
+static int __8b10b_clock_recovery_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)
+{
+ if (rd_interval > 4)
+ drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x (max 4)\n",
+ aux->name, rd_interval);
+
+ if (rd_interval == 0)
+ return 100;
+
+ return rd_interval * 4 * USEC_PER_MSEC;
+}
+
+static int __8b10b_channel_eq_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)
+{
+ if (rd_interval > 4)
+ drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x (max 4)\n",
+ aux->name, rd_interval);
+
+ if (rd_interval == 0)
+ return 400;
+
+ return rd_interval * 4 * USEC_PER_MSEC;
+}
+
+static int __128b132b_channel_eq_delay_us(const struct drm_dp_aux *aux, u8 rd_interval)
+{
+ switch (rd_interval) {
+ default:
+ drm_dbg_kms(aux->drm_dev, "%s: invalid AUX interval 0x%02x\n",
+ aux->name, rd_interval);
+ fallthrough;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_400_US:
+ return 400;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_4_MS:
+ return 4000;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_8_MS:
+ return 8000;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_12_MS:
+ return 12000;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_16_MS:
+ return 16000;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_32_MS:
+ return 32000;
+ case DP_128B132B_TRAINING_AUX_RD_INTERVAL_64_MS:
+ return 64000;
+ }
+}
+
+/*
+ * The link training delays are different for:
+ *
+ * - Clock recovery vs. channel equalization
+ * - DPRX vs. LTTPR
+ * - 128b/132b vs. 8b/10b
+ * - DPCD rev 1.3 vs. later
+ *
+ * Get the correct delay in us, reading DPCD if necessary.
+ */
+static int __read_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ enum drm_dp_phy dp_phy, bool uhbr, bool cr)
+{
+ int (*parse)(const struct drm_dp_aux *aux, u8 rd_interval);
+ unsigned int offset;
+ u8 rd_interval, mask;
+
+ if (dp_phy == DP_PHY_DPRX) {
+ if (uhbr) {
+ if (cr)
+ return 100;
+
+ offset = DP_128B132B_TRAINING_AUX_RD_INTERVAL;
+ mask = DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK;
+ parse = __128b132b_channel_eq_delay_us;
+ } else {
+ if (cr && dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14)
+ return 100;
+
+ offset = DP_TRAINING_AUX_RD_INTERVAL;
+ mask = DP_TRAINING_AUX_RD_MASK;
+ if (cr)
+ parse = __8b10b_clock_recovery_delay_us;
+ else
+ parse = __8b10b_channel_eq_delay_us;
+ }
+ } else {
+ if (uhbr) {
+ offset = DP_128B132B_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER(dp_phy);
+ mask = DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK;
+ parse = __128b132b_channel_eq_delay_us;
+ } else {
+ if (cr)
+ return 100;
+
+ offset = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER(dp_phy);
+ mask = DP_TRAINING_AUX_RD_MASK;
+ parse = __8b10b_channel_eq_delay_us;
+ }
+ }
+
+ if (offset < DP_RECEIVER_CAP_SIZE) {
+ rd_interval = dpcd[offset];
+ } else {
+ if (drm_dp_dpcd_readb(aux, offset, &rd_interval) != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: failed rd interval read\n",
+ aux->name);
+ /* arbitrary default delay */
+ return 400;
+ }
+ }
+
+ return parse(aux, rd_interval & mask);
+}
+
+int drm_dp_read_clock_recovery_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ enum drm_dp_phy dp_phy, bool uhbr)
+{
+ return __read_delay(aux, dpcd, dp_phy, uhbr, true);
+}
+EXPORT_SYMBOL(drm_dp_read_clock_recovery_delay);
+
+int drm_dp_read_channel_eq_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ enum drm_dp_phy dp_phy, bool uhbr)
+{
+ return __read_delay(aux, dpcd, dp_phy, uhbr, false);
+}
+EXPORT_SYMBOL(drm_dp_read_channel_eq_delay);
+
+/* Per DP 2.0 Errata */
+int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux)
+{
+ int unit;
+ u8 val;
+
+ if (drm_dp_dpcd_readb(aux, DP_128B132B_TRAINING_AUX_RD_INTERVAL, &val) != 1) {
+ drm_err(aux->drm_dev, "%s: failed rd interval read\n",
+ aux->name);
+ /* default to max */
+ val = DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK;
+ }
+
+ unit = (val & DP_128B132B_TRAINING_AUX_RD_INTERVAL_1MS_UNIT) ? 1 : 2;
+ val &= DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK;
+
+ return (val + 1) * unit * 1000;
+}
+EXPORT_SYMBOL(drm_dp_128b132b_read_aux_rd_interval);
+
+void drm_dp_link_train_clock_recovery_delay(const struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ u8 rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
+ DP_TRAINING_AUX_RD_MASK;
+ int delay_us;
+
+ if (dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14)
+ delay_us = 100;
+ else
+ delay_us = __8b10b_clock_recovery_delay_us(aux, rd_interval);
+
+ usleep_range(delay_us, delay_us * 2);
+}
+EXPORT_SYMBOL(drm_dp_link_train_clock_recovery_delay);
+
+static void __drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux,
+ u8 rd_interval)
+{
+ int delay_us = __8b10b_channel_eq_delay_us(aux, rd_interval);
+
+ usleep_range(delay_us, delay_us * 2);
+}
+
+void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ __drm_dp_link_train_channel_eq_delay(aux,
+ dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
+ DP_TRAINING_AUX_RD_MASK);
+}
+EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay);
+
+/**
+ * drm_dp_phy_name() - Get the name of the given DP PHY
+ * @dp_phy: The DP PHY identifier
+ *
+ * Given the @dp_phy, get a user friendly name of the DP PHY, either "DPRX" or
+ * "LTTPR <N>", or "<INVALID DP PHY>" on errors. The returned string is always
+ * non-NULL and valid.
+ *
+ * Returns: Name of the DP PHY.
+ */
+const char *drm_dp_phy_name(enum drm_dp_phy dp_phy)
+{
+ static const char * const phy_names[] = {
+ [DP_PHY_DPRX] = "DPRX",
+ [DP_PHY_LTTPR1] = "LTTPR 1",
+ [DP_PHY_LTTPR2] = "LTTPR 2",
+ [DP_PHY_LTTPR3] = "LTTPR 3",
+ [DP_PHY_LTTPR4] = "LTTPR 4",
+ [DP_PHY_LTTPR5] = "LTTPR 5",
+ [DP_PHY_LTTPR6] = "LTTPR 6",
+ [DP_PHY_LTTPR7] = "LTTPR 7",
+ [DP_PHY_LTTPR8] = "LTTPR 8",
+ };
+
+ if (dp_phy < 0 || dp_phy >= ARRAY_SIZE(phy_names) ||
+ WARN_ON(!phy_names[dp_phy]))
+ return "<INVALID DP PHY>";
+
+ return phy_names[dp_phy];
+}
+EXPORT_SYMBOL(drm_dp_phy_name);
+
+void drm_dp_lttpr_link_train_clock_recovery_delay(void)
+{
+ usleep_range(100, 200);
+}
+EXPORT_SYMBOL(drm_dp_lttpr_link_train_clock_recovery_delay);
+
+static u8 dp_lttpr_phy_cap(const u8 phy_cap[DP_LTTPR_PHY_CAP_SIZE], int r)
+{
+ return phy_cap[r - DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1];
+}
+
+void drm_dp_lttpr_link_train_channel_eq_delay(const struct drm_dp_aux *aux,
+ const u8 phy_cap[DP_LTTPR_PHY_CAP_SIZE])
+{
+ u8 interval = dp_lttpr_phy_cap(phy_cap,
+ DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1) &
+ DP_TRAINING_AUX_RD_MASK;
+
+ __drm_dp_link_train_channel_eq_delay(aux, interval);
+}
+EXPORT_SYMBOL(drm_dp_lttpr_link_train_channel_eq_delay);
+
+u8 drm_dp_link_rate_to_bw_code(int link_rate)
+{
+ switch (link_rate) {
+ case 1000000:
+ return DP_LINK_BW_10;
+ case 1350000:
+ return DP_LINK_BW_13_5;
+ case 2000000:
+ return DP_LINK_BW_20;
+ default:
+ /* Spec says link_bw = link_rate / 0.27Gbps */
+ return link_rate / 27000;
+ }
+}
+EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
+
+int drm_dp_bw_code_to_link_rate(u8 link_bw)
+{
+ switch (link_bw) {
+ case DP_LINK_BW_10:
+ return 1000000;
+ case DP_LINK_BW_13_5:
+ return 1350000;
+ case DP_LINK_BW_20:
+ return 2000000;
+ default:
+ /* Spec says link_rate = link_bw * 0.27Gbps */
+ return link_bw * 27000;
+ }
+}
+EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
+
+#define AUX_RETRY_INTERVAL 500 /* us */
+
+static inline void
+drm_dp_dump_access(const struct drm_dp_aux *aux,
+ u8 request, uint offset, void *buffer, int ret)
+{
+ const char *arrow = request == DP_AUX_NATIVE_READ ? "->" : "<-";
+
+ if (ret > 0)
+ drm_dbg_dp(aux->drm_dev, "%s: 0x%05x AUX %s (ret=%3d) %*ph\n",
+ aux->name, offset, arrow, ret, min(ret, 20), buffer);
+ else
+ drm_dbg_dp(aux->drm_dev, "%s: 0x%05x AUX %s (ret=%3d)\n",
+ aux->name, offset, arrow, ret);
+}
+
+/**
+ * DOC: dp helpers
+ *
+ * The DisplayPort AUX channel is an abstraction to allow generic, driver-
+ * independent access to AUX functionality. Drivers can take advantage of
+ * this by filling in the fields of the drm_dp_aux structure.
+ *
+ * Transactions are described using a hardware-independent drm_dp_aux_msg
+ * structure, which is passed into a driver's .transfer() implementation.
+ * Both native and I2C-over-AUX transactions are supported.
+ */
+
+static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
+ unsigned int offset, void *buffer, size_t size)
+{
+ struct drm_dp_aux_msg msg;
+ unsigned int retry, native_reply;
+ int err = 0, ret = 0;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.address = offset;
+ msg.request = request;
+ msg.buffer = buffer;
+ msg.size = size;
+
+ mutex_lock(&aux->hw_mutex);
+
+ /*
+ * The specification doesn't give any recommendation on how often to
+ * retry native transactions. We used to retry 7 times like for
+ * aux i2c transactions but real world devices this wasn't
+ * sufficient, bump to 32 which makes Dell 4k monitors happier.
+ */
+ for (retry = 0; retry < 32; retry++) {
+ if (ret != 0 && ret != -ETIMEDOUT) {
+ usleep_range(AUX_RETRY_INTERVAL,
+ AUX_RETRY_INTERVAL + 100);
+ }
+
+ ret = aux->transfer(aux, &msg);
+ if (ret >= 0) {
+ native_reply = msg.reply & DP_AUX_NATIVE_REPLY_MASK;
+ if (native_reply == DP_AUX_NATIVE_REPLY_ACK) {
+ if (ret == size)
+ goto unlock;
+
+ ret = -EPROTO;
+ } else
+ ret = -EIO;
+ }
+
+ /*
+ * We want the error we return to be the error we received on
+ * the first transaction, since we may get a different error the
+ * next time we retry
+ */
+ if (!err)
+ err = ret;
+ }
+
+ drm_dbg_kms(aux->drm_dev, "%s: Too many retries, giving up. First error: %d\n",
+ aux->name, err);
+ ret = err;
+
+unlock:
+ mutex_unlock(&aux->hw_mutex);
+ return ret;
+}
+
+/**
+ * drm_dp_dpcd_probe() - probe a given DPCD address with a 1-byte read access
+ * @aux: DisplayPort AUX channel (SST)
+ * @offset: address of the register to probe
+ *
+ * Probe the provided DPCD address by reading 1 byte from it. The function can
+ * be used to trigger some side-effect the read access has, like waking up the
+ * sink, without the need for the read-out value.
+ *
+ * Returns 0 if the read access suceeded, or a negative error code on failure.
+ */
+int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset)
+{
+ u8 buffer;
+ int ret;
+
+ ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, &buffer, 1);
+ WARN_ON(ret == 0);
+
+ drm_dp_dump_access(aux, DP_AUX_NATIVE_READ, offset, &buffer, ret);
+
+ return ret < 0 ? ret : 0;
+}
+EXPORT_SYMBOL(drm_dp_dpcd_probe);
+
+/**
+ * drm_dp_dpcd_read() - read a series of bytes from the DPCD
+ * @aux: DisplayPort AUX channel (SST or MST)
+ * @offset: address of the (first) register to read
+ * @buffer: buffer to store the register values
+ * @size: number of bytes in @buffer
+ *
+ * Returns the number of bytes transferred on success, or a negative error
+ * code on failure. -EIO is returned if the request was NAKed by the sink or
+ * if the retry count was exceeded. If not all bytes were transferred, this
+ * function returns -EPROTO. Errors from the underlying AUX channel transfer
+ * function, with the exception of -EBUSY (which causes the transaction to
+ * be retried), are propagated to the caller.
+ */
+ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
+ void *buffer, size_t size)
+{
+ int ret;
+
+ /*
+ * HP ZR24w corrupts the first DPCD access after entering power save
+ * mode. Eg. on a read, the entire buffer will be filled with the same
+ * byte. Do a throw away read to avoid corrupting anything we care
+ * about. Afterwards things will work correctly until the monitor
+ * gets woken up and subsequently re-enters power save mode.
+ *
+ * The user pressing any button on the monitor is enough to wake it
+ * up, so there is no particularly good place to do the workaround.
+ * We just have to do it before any DPCD access and hope that the
+ * monitor doesn't power down exactly after the throw away read.
+ */
+ if (!aux->is_remote) {
+ ret = drm_dp_dpcd_probe(aux, DP_DPCD_REV);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (aux->is_remote)
+ ret = drm_dp_mst_dpcd_read(aux, offset, buffer, size);
+ else
+ ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset,
+ buffer, size);
+
+ drm_dp_dump_access(aux, DP_AUX_NATIVE_READ, offset, buffer, ret);
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_dpcd_read);
+
+/**
+ * drm_dp_dpcd_write() - write a series of bytes to the DPCD
+ * @aux: DisplayPort AUX channel (SST or MST)
+ * @offset: address of the (first) register to write
+ * @buffer: buffer containing the values to write
+ * @size: number of bytes in @buffer
+ *
+ * Returns the number of bytes transferred on success, or a negative error
+ * code on failure. -EIO is returned if the request was NAKed by the sink or
+ * if the retry count was exceeded. If not all bytes were transferred, this
+ * function returns -EPROTO. Errors from the underlying AUX channel transfer
+ * function, with the exception of -EBUSY (which causes the transaction to
+ * be retried), are propagated to the caller.
+ */
+ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,
+ void *buffer, size_t size)
+{
+ int ret;
+
+ if (aux->is_remote)
+ ret = drm_dp_mst_dpcd_write(aux, offset, buffer, size);
+ else
+ ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset,
+ buffer, size);
+
+ drm_dp_dump_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer, ret);
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_dpcd_write);
+
+/**
+ * drm_dp_dpcd_read_link_status() - read DPCD link status (bytes 0x202-0x207)
+ * @aux: DisplayPort AUX channel
+ * @status: buffer to store the link status in (must be at least 6 bytes)
+ *
+ * Returns the number of bytes transferred on success or a negative error
+ * code on failure.
+ */
+int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
+ u8 status[DP_LINK_STATUS_SIZE])
+{
+ return drm_dp_dpcd_read(aux, DP_LANE0_1_STATUS, status,
+ DP_LINK_STATUS_SIZE);
+}
+EXPORT_SYMBOL(drm_dp_dpcd_read_link_status);
+
+/**
+ * drm_dp_dpcd_read_phy_link_status - get the link status information for a DP PHY
+ * @aux: DisplayPort AUX channel
+ * @dp_phy: the DP PHY to get the link status for
+ * @link_status: buffer to return the status in
+ *
+ * Fetch the AUX DPCD registers for the DPRX or an LTTPR PHY link status. The
+ * layout of the returned @link_status matches the DPCD register layout of the
+ * DPRX PHY link status.
+ *
+ * Returns 0 if the information was read successfully or a negative error code
+ * on failure.
+ */
+int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux,
+ enum drm_dp_phy dp_phy,
+ u8 link_status[DP_LINK_STATUS_SIZE])
+{
+ int ret;
+
+ if (dp_phy == DP_PHY_DPRX) {
+ ret = drm_dp_dpcd_read(aux,
+ DP_LANE0_1_STATUS,
+ link_status,
+ DP_LINK_STATUS_SIZE);
+
+ if (ret < 0)
+ return ret;
+
+ WARN_ON(ret != DP_LINK_STATUS_SIZE);
+
+ return 0;
+ }
+
+ ret = drm_dp_dpcd_read(aux,
+ DP_LANE0_1_STATUS_PHY_REPEATER(dp_phy),
+ link_status,
+ DP_LINK_STATUS_SIZE - 1);
+
+ if (ret < 0)
+ return ret;
+
+ WARN_ON(ret != DP_LINK_STATUS_SIZE - 1);
+
+ /* Convert the LTTPR to the sink PHY link status layout */
+ memmove(&link_status[DP_SINK_STATUS - DP_LANE0_1_STATUS + 1],
+ &link_status[DP_SINK_STATUS - DP_LANE0_1_STATUS],
+ DP_LINK_STATUS_SIZE - (DP_SINK_STATUS - DP_LANE0_1_STATUS) - 1);
+ link_status[DP_SINK_STATUS - DP_LANE0_1_STATUS] = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dpcd_read_phy_link_status);
+
+static bool is_edid_digital_input_dp(const struct edid *edid)
+{
+ return edid && edid->revision >= 4 &&
+ edid->input & DRM_EDID_INPUT_DIGITAL &&
+ (edid->input & DRM_EDID_DIGITAL_TYPE_MASK) == DRM_EDID_DIGITAL_TYPE_DP;
+}
+
+/**
+ * drm_dp_downstream_is_type() - is the downstream facing port of certain type?
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @type: port type to be checked. Can be:
+ * %DP_DS_PORT_TYPE_DP, %DP_DS_PORT_TYPE_VGA, %DP_DS_PORT_TYPE_DVI,
+ * %DP_DS_PORT_TYPE_HDMI, %DP_DS_PORT_TYPE_NON_EDID,
+ * %DP_DS_PORT_TYPE_DP_DUALMODE or %DP_DS_PORT_TYPE_WIRELESS.
+ *
+ * Caveat: Only works with DPCD 1.1+ port caps.
+ *
+ * Returns: whether the downstream facing port matches the type.
+ */
+bool drm_dp_downstream_is_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4], u8 type)
+{
+ return drm_dp_is_branch(dpcd) &&
+ dpcd[DP_DPCD_REV] >= 0x11 &&
+ (port_cap[0] & DP_DS_PORT_TYPE_MASK) == type;
+}
+EXPORT_SYMBOL(drm_dp_downstream_is_type);
+
+/**
+ * drm_dp_downstream_is_tmds() - is the downstream facing port TMDS?
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @edid: EDID
+ *
+ * Returns: whether the downstream facing port is TMDS (HDMI/DVI).
+ */
+bool drm_dp_downstream_is_tmds(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ const struct edid *edid)
+{
+ if (dpcd[DP_DPCD_REV] < 0x11) {
+ switch (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) {
+ case DP_DWN_STRM_PORT_TYPE_TMDS:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ if (is_edid_digital_input_dp(edid))
+ return false;
+ fallthrough;
+ case DP_DS_PORT_TYPE_DVI:
+ case DP_DS_PORT_TYPE_HDMI:
+ return true;
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_is_tmds);
+
+/**
+ * drm_dp_send_real_edid_checksum() - send back real edid checksum value
+ * @aux: DisplayPort AUX channel
+ * @real_edid_checksum: real edid checksum for the last block
+ *
+ * Returns:
+ * True on success
+ */
+bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux,
+ u8 real_edid_checksum)
+{
+ u8 link_edid_read = 0, auto_test_req = 0, test_resp = 0;
+
+ if (drm_dp_dpcd_read(aux, DP_DEVICE_SERVICE_IRQ_VECTOR,
+ &auto_test_req, 1) < 1) {
+ drm_err(aux->drm_dev, "%s: DPCD failed read at register 0x%x\n",
+ aux->name, DP_DEVICE_SERVICE_IRQ_VECTOR);
+ return false;
+ }
+ auto_test_req &= DP_AUTOMATED_TEST_REQUEST;
+
+ if (drm_dp_dpcd_read(aux, DP_TEST_REQUEST, &link_edid_read, 1) < 1) {
+ drm_err(aux->drm_dev, "%s: DPCD failed read at register 0x%x\n",
+ aux->name, DP_TEST_REQUEST);
+ return false;
+ }
+ link_edid_read &= DP_TEST_LINK_EDID_READ;
+
+ if (!auto_test_req || !link_edid_read) {
+ drm_dbg_kms(aux->drm_dev, "%s: Source DUT does not support TEST_EDID_READ\n",
+ aux->name);
+ return false;
+ }
+
+ if (drm_dp_dpcd_write(aux, DP_DEVICE_SERVICE_IRQ_VECTOR,
+ &auto_test_req, 1) < 1) {
+ drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",
+ aux->name, DP_DEVICE_SERVICE_IRQ_VECTOR);
+ return false;
+ }
+
+ /* send back checksum for the last edid extension block data */
+ if (drm_dp_dpcd_write(aux, DP_TEST_EDID_CHECKSUM,
+ &real_edid_checksum, 1) < 1) {
+ drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",
+ aux->name, DP_TEST_EDID_CHECKSUM);
+ return false;
+ }
+
+ test_resp |= DP_TEST_EDID_CHECKSUM_WRITE;
+ if (drm_dp_dpcd_write(aux, DP_TEST_RESPONSE, &test_resp, 1) < 1) {
+ drm_err(aux->drm_dev, "%s: DPCD failed write at register 0x%x\n",
+ aux->name, DP_TEST_RESPONSE);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(drm_dp_send_real_edid_checksum);
+
+static u8 drm_dp_downstream_port_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ u8 port_count = dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_PORT_COUNT_MASK;
+
+ if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE && port_count > 4)
+ port_count = 4;
+
+ return port_count;
+}
+
+static int drm_dp_read_extended_dpcd_caps(struct drm_dp_aux *aux,
+ u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ u8 dpcd_ext[DP_RECEIVER_CAP_SIZE];
+ int ret;
+
+ /*
+ * Prior to DP1.3 the bit represented by
+ * DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT was reserved.
+ * If it is set DP_DPCD_REV at 0000h could be at a value less than
+ * the true capability of the panel. The only way to check is to
+ * then compare 0000h and 2200h.
+ */
+ if (!(dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
+ DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT))
+ return 0;
+
+ ret = drm_dp_dpcd_read(aux, DP_DP13_DPCD_REV, &dpcd_ext,
+ sizeof(dpcd_ext));
+ if (ret < 0)
+ return ret;
+ if (ret != sizeof(dpcd_ext))
+ return -EIO;
+
+ if (dpcd[DP_DPCD_REV] > dpcd_ext[DP_DPCD_REV]) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Extended DPCD rev less than base DPCD rev (%d > %d)\n",
+ aux->name, dpcd[DP_DPCD_REV], dpcd_ext[DP_DPCD_REV]);
+ return 0;
+ }
+
+ if (!memcmp(dpcd, dpcd_ext, sizeof(dpcd_ext)))
+ return 0;
+
+ drm_dbg_kms(aux->drm_dev, "%s: Base DPCD: %*ph\n", aux->name, DP_RECEIVER_CAP_SIZE, dpcd);
+
+ memcpy(dpcd, dpcd_ext, sizeof(dpcd_ext));
+
+ return 0;
+}
+
+/**
+ * drm_dp_read_dpcd_caps() - read DPCD caps and extended DPCD caps if
+ * available
+ * @aux: DisplayPort AUX channel
+ * @dpcd: Buffer to store the resulting DPCD in
+ *
+ * Attempts to read the base DPCD caps for @aux. Additionally, this function
+ * checks for and reads the extended DPRX caps (%DP_DP13_DPCD_REV) if
+ * present.
+ *
+ * Returns: %0 if the DPCD was read successfully, negative error code
+ * otherwise.
+ */
+int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux,
+ u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ int ret;
+
+ ret = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, DP_RECEIVER_CAP_SIZE);
+ if (ret < 0)
+ return ret;
+ if (ret != DP_RECEIVER_CAP_SIZE || dpcd[DP_DPCD_REV] == 0)
+ return -EIO;
+
+ ret = drm_dp_read_extended_dpcd_caps(aux, dpcd);
+ if (ret < 0)
+ return ret;
+
+ drm_dbg_kms(aux->drm_dev, "%s: DPCD: %*ph\n", aux->name, DP_RECEIVER_CAP_SIZE, dpcd);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_read_dpcd_caps);
+
+/**
+ * drm_dp_read_downstream_info() - read DPCD downstream port info if available
+ * @aux: DisplayPort AUX channel
+ * @dpcd: A cached copy of the port's DPCD
+ * @downstream_ports: buffer to store the downstream port info in
+ *
+ * See also:
+ * drm_dp_downstream_max_clock()
+ * drm_dp_downstream_max_bpc()
+ *
+ * Returns: 0 if either the downstream port info was read successfully or
+ * there was no downstream info to read, or a negative error code otherwise.
+ */
+int drm_dp_read_downstream_info(struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS])
+{
+ int ret;
+ u8 len;
+
+ memset(downstream_ports, 0, DP_MAX_DOWNSTREAM_PORTS);
+
+ /* No downstream info to read */
+ if (!drm_dp_is_branch(dpcd) || dpcd[DP_DPCD_REV] == DP_DPCD_REV_10)
+ return 0;
+
+ /* Some branches advertise having 0 downstream ports, despite also advertising they have a
+ * downstream port present. The DP spec isn't clear on if this is allowed or not, but since
+ * some branches do it we need to handle it regardless.
+ */
+ len = drm_dp_downstream_port_count(dpcd);
+ if (!len)
+ return 0;
+
+ if (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE)
+ len *= 4;
+
+ ret = drm_dp_dpcd_read(aux, DP_DOWNSTREAM_PORT_0, downstream_ports, len);
+ if (ret < 0)
+ return ret;
+ if (ret != len)
+ return -EIO;
+
+ drm_dbg_kms(aux->drm_dev, "%s: DPCD DFP: %*ph\n", aux->name, len, downstream_ports);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_read_downstream_info);
+
+/**
+ * drm_dp_downstream_max_dotclock() - extract downstream facing port max dot clock
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Returns: Downstream facing port max dot clock in kHz on success,
+ * or 0 if max clock not defined
+ */
+int drm_dp_downstream_max_dotclock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+{
+ if (!drm_dp_is_branch(dpcd))
+ return 0;
+
+ if (dpcd[DP_DPCD_REV] < 0x11)
+ return 0;
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_VGA:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return 0;
+ return port_cap[1] * 8000;
+ default:
+ return 0;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_dotclock);
+
+/**
+ * drm_dp_downstream_max_tmds_clock() - extract downstream facing port max TMDS clock
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @edid: EDID
+ *
+ * Returns: HDMI/DVI downstream facing port max TMDS clock in kHz on success,
+ * or 0 if max TMDS clock not defined
+ */
+int drm_dp_downstream_max_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ const struct edid *edid)
+{
+ if (!drm_dp_is_branch(dpcd))
+ return 0;
+
+ if (dpcd[DP_DPCD_REV] < 0x11) {
+ switch (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) {
+ case DP_DWN_STRM_PORT_TYPE_TMDS:
+ return 165000;
+ default:
+ return 0;
+ }
+ }
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ if (is_edid_digital_input_dp(edid))
+ return 0;
+ /*
+ * It's left up to the driver to check the
+ * DP dual mode adapter's max TMDS clock.
+ *
+ * Unfortunately it looks like branch devices
+ * may not fordward that the DP dual mode i2c
+ * access so we just usually get i2c nak :(
+ */
+ fallthrough;
+ case DP_DS_PORT_TYPE_HDMI:
+ /*
+ * We should perhaps assume 165 MHz when detailed cap
+ * info is not available. But looks like many typical
+ * branch devices fall into that category and so we'd
+ * probably end up with users complaining that they can't
+ * get high resolution modes with their favorite dongle.
+ *
+ * So let's limit to 300 MHz instead since DPCD 1.4
+ * HDMI 2.0 DFPs are required to have the detailed cap
+ * info. So it's more likely we're dealing with a HDMI 1.4
+ * compatible* device here.
+ */
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return 300000;
+ return port_cap[1] * 2500;
+ case DP_DS_PORT_TYPE_DVI:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return 165000;
+ /* FIXME what to do about DVI dual link? */
+ return port_cap[1] * 2500;
+ default:
+ return 0;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_tmds_clock);
+
+/**
+ * drm_dp_downstream_min_tmds_clock() - extract downstream facing port min TMDS clock
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @edid: EDID
+ *
+ * Returns: HDMI/DVI downstream facing port min TMDS clock in kHz on success,
+ * or 0 if max TMDS clock not defined
+ */
+int drm_dp_downstream_min_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ const struct edid *edid)
+{
+ if (!drm_dp_is_branch(dpcd))
+ return 0;
+
+ if (dpcd[DP_DPCD_REV] < 0x11) {
+ switch (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) {
+ case DP_DWN_STRM_PORT_TYPE_TMDS:
+ return 25000;
+ default:
+ return 0;
+ }
+ }
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ if (is_edid_digital_input_dp(edid))
+ return 0;
+ fallthrough;
+ case DP_DS_PORT_TYPE_DVI:
+ case DP_DS_PORT_TYPE_HDMI:
+ /*
+ * Unclear whether the protocol converter could
+ * utilize pixel replication. Assume it won't.
+ */
+ return 25000;
+ default:
+ return 0;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_min_tmds_clock);
+
+/**
+ * drm_dp_downstream_max_bpc() - extract downstream facing port max
+ * bits per component
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: downstream facing port capabilities
+ * @edid: EDID
+ *
+ * Returns: Max bpc on success or 0 if max bpc not defined
+ */
+int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ const struct edid *edid)
+{
+ if (!drm_dp_is_branch(dpcd))
+ return 0;
+
+ if (dpcd[DP_DPCD_REV] < 0x11) {
+ switch (dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK) {
+ case DP_DWN_STRM_PORT_TYPE_DP:
+ return 0;
+ default:
+ return 8;
+ }
+ }
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_DP:
+ return 0;
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ if (is_edid_digital_input_dp(edid))
+ return 0;
+ fallthrough;
+ case DP_DS_PORT_TYPE_HDMI:
+ case DP_DS_PORT_TYPE_DVI:
+ case DP_DS_PORT_TYPE_VGA:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return 8;
+
+ switch (port_cap[2] & DP_DS_MAX_BPC_MASK) {
+ case DP_DS_8BPC:
+ return 8;
+ case DP_DS_10BPC:
+ return 10;
+ case DP_DS_12BPC:
+ return 12;
+ case DP_DS_16BPC:
+ return 16;
+ default:
+ return 8;
+ }
+ break;
+ default:
+ return 8;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_max_bpc);
+
+/**
+ * drm_dp_downstream_420_passthrough() - determine downstream facing port
+ * YCbCr 4:2:0 pass-through capability
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: downstream facing port capabilities
+ *
+ * Returns: whether the downstream facing port can pass through YCbCr 4:2:0
+ */
+bool drm_dp_downstream_420_passthrough(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+{
+ if (!drm_dp_is_branch(dpcd))
+ return false;
+
+ if (dpcd[DP_DPCD_REV] < 0x13)
+ return false;
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_DP:
+ return true;
+ case DP_DS_PORT_TYPE_HDMI:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return false;
+
+ return port_cap[3] & DP_DS_HDMI_YCBCR420_PASS_THROUGH;
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_420_passthrough);
+
+/**
+ * drm_dp_downstream_444_to_420_conversion() - determine downstream facing port
+ * YCbCr 4:4:4->4:2:0 conversion capability
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: downstream facing port capabilities
+ *
+ * Returns: whether the downstream facing port can convert YCbCr 4:4:4 to 4:2:0
+ */
+bool drm_dp_downstream_444_to_420_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+{
+ if (!drm_dp_is_branch(dpcd))
+ return false;
+
+ if (dpcd[DP_DPCD_REV] < 0x13)
+ return false;
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_HDMI:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return false;
+
+ return port_cap[3] & DP_DS_HDMI_YCBCR444_TO_420_CONV;
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_444_to_420_conversion);
+
+/**
+ * drm_dp_downstream_rgb_to_ycbcr_conversion() - determine downstream facing port
+ * RGB->YCbCr conversion capability
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: downstream facing port capabilities
+ * @color_spc: Colorspace for which conversion cap is sought
+ *
+ * Returns: whether the downstream facing port can convert RGB->YCbCr for a given
+ * colorspace.
+ */
+bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ u8 color_spc)
+{
+ if (!drm_dp_is_branch(dpcd))
+ return false;
+
+ if (dpcd[DP_DPCD_REV] < 0x13)
+ return false;
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_HDMI:
+ if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DETAILED_CAP_INFO_AVAILABLE) == 0)
+ return false;
+
+ return port_cap[3] & color_spc;
+ default:
+ return false;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_rgb_to_ycbcr_conversion);
+
+/**
+ * drm_dp_downstream_mode() - return a mode for downstream facing port
+ * @dev: DRM device
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Provides a suitable mode for downstream facing ports without EDID.
+ *
+ * Returns: A new drm_display_mode on success or NULL on failure
+ */
+struct drm_display_mode *
+drm_dp_downstream_mode(struct drm_device *dev,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+
+{
+ u8 vic;
+
+ if (!drm_dp_is_branch(dpcd))
+ return NULL;
+
+ if (dpcd[DP_DPCD_REV] < 0x11)
+ return NULL;
+
+ switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) {
+ case DP_DS_PORT_TYPE_NON_EDID:
+ switch (port_cap[0] & DP_DS_NON_EDID_MASK) {
+ case DP_DS_NON_EDID_720x480i_60:
+ vic = 6;
+ break;
+ case DP_DS_NON_EDID_720x480i_50:
+ vic = 21;
+ break;
+ case DP_DS_NON_EDID_1920x1080i_60:
+ vic = 5;
+ break;
+ case DP_DS_NON_EDID_1920x1080i_50:
+ vic = 20;
+ break;
+ case DP_DS_NON_EDID_1280x720_60:
+ vic = 4;
+ break;
+ case DP_DS_NON_EDID_1280x720_50:
+ vic = 19;
+ break;
+ default:
+ return NULL;
+ }
+ return drm_display_mode_from_cea_vic(dev, vic);
+ default:
+ return NULL;
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_mode);
+
+/**
+ * drm_dp_downstream_id() - identify branch device
+ * @aux: DisplayPort AUX channel
+ * @id: DisplayPort branch device id
+ *
+ * Returns branch device id on success or NULL on failure
+ */
+int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6])
+{
+ return drm_dp_dpcd_read(aux, DP_BRANCH_ID, id, 6);
+}
+EXPORT_SYMBOL(drm_dp_downstream_id);
+
+/**
+ * drm_dp_downstream_debug() - debug DP branch devices
+ * @m: pointer for debugfs file
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ * @edid: EDID
+ * @aux: DisplayPort AUX channel
+ *
+ */
+void drm_dp_downstream_debug(struct seq_file *m,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4],
+ const struct edid *edid,
+ struct drm_dp_aux *aux)
+{
+ bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+ DP_DETAILED_CAP_INFO_AVAILABLE;
+ int clk;
+ int bpc;
+ char id[7];
+ int len;
+ uint8_t rev[2];
+ int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+ bool branch_device = drm_dp_is_branch(dpcd);
+
+ seq_printf(m, "\tDP branch device present: %s\n",
+ str_yes_no(branch_device));
+
+ if (!branch_device)
+ return;
+
+ switch (type) {
+ case DP_DS_PORT_TYPE_DP:
+ seq_puts(m, "\t\tType: DisplayPort\n");
+ break;
+ case DP_DS_PORT_TYPE_VGA:
+ seq_puts(m, "\t\tType: VGA\n");
+ break;
+ case DP_DS_PORT_TYPE_DVI:
+ seq_puts(m, "\t\tType: DVI\n");
+ break;
+ case DP_DS_PORT_TYPE_HDMI:
+ seq_puts(m, "\t\tType: HDMI\n");
+ break;
+ case DP_DS_PORT_TYPE_NON_EDID:
+ seq_puts(m, "\t\tType: others without EDID support\n");
+ break;
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ seq_puts(m, "\t\tType: DP++\n");
+ break;
+ case DP_DS_PORT_TYPE_WIRELESS:
+ seq_puts(m, "\t\tType: Wireless\n");
+ break;
+ default:
+ seq_puts(m, "\t\tType: N/A\n");
+ }
+
+ memset(id, 0, sizeof(id));
+ drm_dp_downstream_id(aux, id);
+ seq_printf(m, "\t\tID: %s\n", id);
+
+ len = drm_dp_dpcd_read(aux, DP_BRANCH_HW_REV, &rev[0], 1);
+ if (len > 0)
+ seq_printf(m, "\t\tHW: %d.%d\n",
+ (rev[0] & 0xf0) >> 4, rev[0] & 0xf);
+
+ len = drm_dp_dpcd_read(aux, DP_BRANCH_SW_REV, rev, 2);
+ if (len > 0)
+ seq_printf(m, "\t\tSW: %d.%d\n", rev[0], rev[1]);
+
+ if (detailed_cap_info) {
+ clk = drm_dp_downstream_max_dotclock(dpcd, port_cap);
+ if (clk > 0)
+ seq_printf(m, "\t\tMax dot clock: %d kHz\n", clk);
+
+ clk = drm_dp_downstream_max_tmds_clock(dpcd, port_cap, edid);
+ if (clk > 0)
+ seq_printf(m, "\t\tMax TMDS clock: %d kHz\n", clk);
+
+ clk = drm_dp_downstream_min_tmds_clock(dpcd, port_cap, edid);
+ if (clk > 0)
+ seq_printf(m, "\t\tMin TMDS clock: %d kHz\n", clk);
+
+ bpc = drm_dp_downstream_max_bpc(dpcd, port_cap, edid);
+
+ if (bpc > 0)
+ seq_printf(m, "\t\tMax bpc: %d\n", bpc);
+ }
+}
+EXPORT_SYMBOL(drm_dp_downstream_debug);
+
+/**
+ * drm_dp_subconnector_type() - get DP branch device type
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ */
+enum drm_mode_subconnector
+drm_dp_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+{
+ int type;
+ if (!drm_dp_is_branch(dpcd))
+ return DRM_MODE_SUBCONNECTOR_Native;
+ /* DP 1.0 approach */
+ if (dpcd[DP_DPCD_REV] == DP_DPCD_REV_10) {
+ type = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+ DP_DWN_STRM_PORT_TYPE_MASK;
+
+ switch (type) {
+ case DP_DWN_STRM_PORT_TYPE_TMDS:
+ /* Can be HDMI or DVI-D, DVI-D is a safer option */
+ return DRM_MODE_SUBCONNECTOR_DVID;
+ case DP_DWN_STRM_PORT_TYPE_ANALOG:
+ /* Can be VGA or DVI-A, VGA is more popular */
+ return DRM_MODE_SUBCONNECTOR_VGA;
+ case DP_DWN_STRM_PORT_TYPE_DP:
+ return DRM_MODE_SUBCONNECTOR_DisplayPort;
+ case DP_DWN_STRM_PORT_TYPE_OTHER:
+ default:
+ return DRM_MODE_SUBCONNECTOR_Unknown;
+ }
+ }
+ type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
+
+ switch (type) {
+ case DP_DS_PORT_TYPE_DP:
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ return DRM_MODE_SUBCONNECTOR_DisplayPort;
+ case DP_DS_PORT_TYPE_VGA:
+ return DRM_MODE_SUBCONNECTOR_VGA;
+ case DP_DS_PORT_TYPE_DVI:
+ return DRM_MODE_SUBCONNECTOR_DVID;
+ case DP_DS_PORT_TYPE_HDMI:
+ return DRM_MODE_SUBCONNECTOR_HDMIA;
+ case DP_DS_PORT_TYPE_WIRELESS:
+ return DRM_MODE_SUBCONNECTOR_Wireless;
+ case DP_DS_PORT_TYPE_NON_EDID:
+ default:
+ return DRM_MODE_SUBCONNECTOR_Unknown;
+ }
+}
+EXPORT_SYMBOL(drm_dp_subconnector_type);
+
+/**
+ * drm_dp_set_subconnector_property - set subconnector for DP connector
+ * @connector: connector to set property on
+ * @status: connector status
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Called by a driver on every detect event.
+ */
+void drm_dp_set_subconnector_property(struct drm_connector *connector,
+ enum drm_connector_status status,
+ const u8 *dpcd,
+ const u8 port_cap[4])
+{
+ enum drm_mode_subconnector subconnector = DRM_MODE_SUBCONNECTOR_Unknown;
+
+ if (status == connector_status_connected)
+ subconnector = drm_dp_subconnector_type(dpcd, port_cap);
+ drm_object_property_set_value(&connector->base,
+ connector->dev->mode_config.dp_subconnector_property,
+ subconnector);
+}
+EXPORT_SYMBOL(drm_dp_set_subconnector_property);
+
+/**
+ * drm_dp_read_sink_count_cap() - Check whether a given connector has a valid sink
+ * count
+ * @connector: The DRM connector to check
+ * @dpcd: A cached copy of the connector's DPCD RX capabilities
+ * @desc: A cached copy of the connector's DP descriptor
+ *
+ * See also: drm_dp_read_sink_count()
+ *
+ * Returns: %True if the (e)DP connector has a valid sink count that should
+ * be probed, %false otherwise.
+ */
+bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const struct drm_dp_desc *desc)
+{
+ /* Some eDP panels don't set a valid value for the sink count */
+ return connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
+ dpcd[DP_DPCD_REV] >= DP_DPCD_REV_11 &&
+ dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT &&
+ !drm_dp_has_quirk(desc, DP_DPCD_QUIRK_NO_SINK_COUNT);
+}
+EXPORT_SYMBOL(drm_dp_read_sink_count_cap);
+
+/**
+ * drm_dp_read_sink_count() - Retrieve the sink count for a given sink
+ * @aux: The DP AUX channel to use
+ *
+ * See also: drm_dp_read_sink_count_cap()
+ *
+ * Returns: The current sink count reported by @aux, or a negative error code
+ * otherwise.
+ */
+int drm_dp_read_sink_count(struct drm_dp_aux *aux)
+{
+ u8 count;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_SINK_COUNT, &count);
+ if (ret < 0)
+ return ret;
+ if (ret != 1)
+ return -EIO;
+
+ return DP_GET_SINK_COUNT(count);
+}
+EXPORT_SYMBOL(drm_dp_read_sink_count);
+
+/*
+ * I2C-over-AUX implementation
+ */
+
+static u32 drm_dp_i2c_functionality(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+ I2C_FUNC_SMBUS_READ_BLOCK_DATA |
+ I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
+ I2C_FUNC_10BIT_ADDR;
+}
+
+static void drm_dp_i2c_msg_write_status_update(struct drm_dp_aux_msg *msg)
+{
+ /*
+ * In case of i2c defer or short i2c ack reply to a write,
+ * we need to switch to WRITE_STATUS_UPDATE to drain the
+ * rest of the message
+ */
+ if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_I2C_WRITE) {
+ msg->request &= DP_AUX_I2C_MOT;
+ msg->request |= DP_AUX_I2C_WRITE_STATUS_UPDATE;
+ }
+}
+
+#define AUX_PRECHARGE_LEN 10 /* 10 to 16 */
+#define AUX_SYNC_LEN (16 + 4) /* preamble + AUX_SYNC_END */
+#define AUX_STOP_LEN 4
+#define AUX_CMD_LEN 4
+#define AUX_ADDRESS_LEN 20
+#define AUX_REPLY_PAD_LEN 4
+#define AUX_LENGTH_LEN 8
+
+/*
+ * Calculate the duration of the AUX request/reply in usec. Gives the
+ * "best" case estimate, ie. successful while as short as possible.
+ */
+static int drm_dp_aux_req_duration(const struct drm_dp_aux_msg *msg)
+{
+ int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
+ AUX_CMD_LEN + AUX_ADDRESS_LEN + AUX_LENGTH_LEN;
+
+ if ((msg->request & DP_AUX_I2C_READ) == 0)
+ len += msg->size * 8;
+
+ return len;
+}
+
+static int drm_dp_aux_reply_duration(const struct drm_dp_aux_msg *msg)
+{
+ int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
+ AUX_CMD_LEN + AUX_REPLY_PAD_LEN;
+
+ /*
+ * For read we expect what was asked. For writes there will
+ * be 0 or 1 data bytes. Assume 0 for the "best" case.
+ */
+ if (msg->request & DP_AUX_I2C_READ)
+ len += msg->size * 8;
+
+ return len;
+}
+
+#define I2C_START_LEN 1
+#define I2C_STOP_LEN 1
+#define I2C_ADDR_LEN 9 /* ADDRESS + R/W + ACK/NACK */
+#define I2C_DATA_LEN 9 /* DATA + ACK/NACK */
+
+/*
+ * Calculate the length of the i2c transfer in usec, assuming
+ * the i2c bus speed is as specified. Gives the "worst"
+ * case estimate, ie. successful while as long as possible.
+ * Doesn't account the "MOT" bit, and instead assumes each
+ * message includes a START, ADDRESS and STOP. Neither does it
+ * account for additional random variables such as clock stretching.
+ */
+static int drm_dp_i2c_msg_duration(const struct drm_dp_aux_msg *msg,
+ int i2c_speed_khz)
+{
+ /* AUX bitrate is 1MHz, i2c bitrate as specified */
+ return DIV_ROUND_UP((I2C_START_LEN + I2C_ADDR_LEN +
+ msg->size * I2C_DATA_LEN +
+ I2C_STOP_LEN) * 1000, i2c_speed_khz);
+}
+
+/*
+ * Determine how many retries should be attempted to successfully transfer
+ * the specified message, based on the estimated durations of the
+ * i2c and AUX transfers.
+ */
+static int drm_dp_i2c_retry_count(const struct drm_dp_aux_msg *msg,
+ int i2c_speed_khz)
+{
+ int aux_time_us = drm_dp_aux_req_duration(msg) +
+ drm_dp_aux_reply_duration(msg);
+ int i2c_time_us = drm_dp_i2c_msg_duration(msg, i2c_speed_khz);
+
+ return DIV_ROUND_UP(i2c_time_us, aux_time_us + AUX_RETRY_INTERVAL);
+}
+
+/*
+ * FIXME currently assumes 10 kHz as some real world devices seem
+ * to require it. We should query/set the speed via DPCD if supported.
+ */
+static int dp_aux_i2c_speed_khz __read_mostly = 10;
+module_param_unsafe(dp_aux_i2c_speed_khz, int, 0644);
+MODULE_PARM_DESC(dp_aux_i2c_speed_khz,
+ "Assumed speed of the i2c bus in kHz, (1-400, default 10)");
+
+/*
+ * Transfer a single I2C-over-AUX message and handle various error conditions,
+ * retrying the transaction as appropriate. It is assumed that the
+ * &drm_dp_aux.transfer function does not modify anything in the msg other than the
+ * reply field.
+ *
+ * Returns bytes transferred on success, or a negative error code on failure.
+ */
+static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+{
+ unsigned int retry, defer_i2c;
+ int ret;
+ /*
+ * DP1.2 sections 2.7.7.1.5.6.1 and 2.7.7.1.6.6.1: A DP Source device
+ * is required to retry at least seven times upon receiving AUX_DEFER
+ * before giving up the AUX transaction.
+ *
+ * We also try to account for the i2c bus speed.
+ */
+ int max_retries = max(7, drm_dp_i2c_retry_count(msg, dp_aux_i2c_speed_khz));
+
+ for (retry = 0, defer_i2c = 0; retry < (max_retries + defer_i2c); retry++) {
+ ret = aux->transfer(aux, msg);
+ if (ret < 0) {
+ if (ret == -EBUSY)
+ continue;
+
+ /*
+ * While timeouts can be errors, they're usually normal
+ * behavior (for instance, when a driver tries to
+ * communicate with a non-existent DisplayPort device).
+ * Avoid spamming the kernel log with timeout errors.
+ */
+ if (ret == -ETIMEDOUT)
+ drm_dbg_kms_ratelimited(aux->drm_dev, "%s: transaction timed out\n",
+ aux->name);
+ else
+ drm_dbg_kms(aux->drm_dev, "%s: transaction failed: %d\n",
+ aux->name, ret);
+ return ret;
+ }
+
+
+ switch (msg->reply & DP_AUX_NATIVE_REPLY_MASK) {
+ case DP_AUX_NATIVE_REPLY_ACK:
+ /*
+ * For I2C-over-AUX transactions this isn't enough, we
+ * need to check for the I2C ACK reply.
+ */
+ break;
+
+ case DP_AUX_NATIVE_REPLY_NACK:
+ drm_dbg_kms(aux->drm_dev, "%s: native nack (result=%d, size=%zu)\n",
+ aux->name, ret, msg->size);
+ return -EREMOTEIO;
+
+ case DP_AUX_NATIVE_REPLY_DEFER:
+ drm_dbg_kms(aux->drm_dev, "%s: native defer\n", aux->name);
+ /*
+ * We could check for I2C bit rate capabilities and if
+ * available adjust this interval. We could also be
+ * more careful with DP-to-legacy adapters where a
+ * long legacy cable may force very low I2C bit rates.
+ *
+ * For now just defer for long enough to hopefully be
+ * safe for all use-cases.
+ */
+ usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100);
+ continue;
+
+ default:
+ drm_err(aux->drm_dev, "%s: invalid native reply %#04x\n",
+ aux->name, msg->reply);
+ return -EREMOTEIO;
+ }
+
+ switch (msg->reply & DP_AUX_I2C_REPLY_MASK) {
+ case DP_AUX_I2C_REPLY_ACK:
+ /*
+ * Both native ACK and I2C ACK replies received. We
+ * can assume the transfer was successful.
+ */
+ if (ret != msg->size)
+ drm_dp_i2c_msg_write_status_update(msg);
+ return ret;
+
+ case DP_AUX_I2C_REPLY_NACK:
+ drm_dbg_kms(aux->drm_dev, "%s: I2C nack (result=%d, size=%zu)\n",
+ aux->name, ret, msg->size);
+ aux->i2c_nack_count++;
+ return -EREMOTEIO;
+
+ case DP_AUX_I2C_REPLY_DEFER:
+ drm_dbg_kms(aux->drm_dev, "%s: I2C defer\n", aux->name);
+ /* DP Compliance Test 4.2.2.5 Requirement:
+ * Must have at least 7 retries for I2C defers on the
+ * transaction to pass this test
+ */
+ aux->i2c_defer_count++;
+ if (defer_i2c < 7)
+ defer_i2c++;
+ usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100);
+ drm_dp_i2c_msg_write_status_update(msg);
+
+ continue;
+
+ default:
+ drm_err(aux->drm_dev, "%s: invalid I2C reply %#04x\n",
+ aux->name, msg->reply);
+ return -EREMOTEIO;
+ }
+ }
+
+ drm_dbg_kms(aux->drm_dev, "%s: Too many retries, giving up\n", aux->name);
+ return -EREMOTEIO;
+}
+
+static void drm_dp_i2c_msg_set_request(struct drm_dp_aux_msg *msg,
+ const struct i2c_msg *i2c_msg)
+{
+ msg->request = (i2c_msg->flags & I2C_M_RD) ?
+ DP_AUX_I2C_READ : DP_AUX_I2C_WRITE;
+ if (!(i2c_msg->flags & I2C_M_STOP))
+ msg->request |= DP_AUX_I2C_MOT;
+}
+
+/*
+ * Keep retrying drm_dp_i2c_do_msg until all data has been transferred.
+ *
+ * Returns an error code on failure, or a recommended transfer size on success.
+ */
+static int drm_dp_i2c_drain_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *orig_msg)
+{
+ int err, ret = orig_msg->size;
+ struct drm_dp_aux_msg msg = *orig_msg;
+
+ while (msg.size > 0) {
+ err = drm_dp_i2c_do_msg(aux, &msg);
+ if (err <= 0)
+ return err == 0 ? -EPROTO : err;
+
+ if (err < msg.size && err < ret) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Partial I2C reply: requested %zu bytes got %d bytes\n",
+ aux->name, msg.size, err);
+ ret = err;
+ }
+
+ msg.size -= err;
+ msg.buffer += err;
+ }
+
+ return ret;
+}
+
+/*
+ * Bizlink designed DP->DVI-D Dual Link adapters require the I2C over AUX
+ * packets to be as large as possible. If not, the I2C transactions never
+ * succeed. Hence the default is maximum.
+ */
+static int dp_aux_i2c_transfer_size __read_mostly = DP_AUX_MAX_PAYLOAD_BYTES;
+module_param_unsafe(dp_aux_i2c_transfer_size, int, 0644);
+MODULE_PARM_DESC(dp_aux_i2c_transfer_size,
+ "Number of bytes to transfer in a single I2C over DP AUX CH message, (1-16, default 16)");
+
+static int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
+ int num)
+{
+ struct drm_dp_aux *aux = adapter->algo_data;
+ unsigned int i, j;
+ unsigned transfer_size;
+ struct drm_dp_aux_msg msg;
+ int err = 0;
+
+ dp_aux_i2c_transfer_size = clamp(dp_aux_i2c_transfer_size, 1, DP_AUX_MAX_PAYLOAD_BYTES);
+
+ memset(&msg, 0, sizeof(msg));
+
+ for (i = 0; i < num; i++) {
+ msg.address = msgs[i].addr;
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
+ /* Send a bare address packet to start the transaction.
+ * Zero sized messages specify an address only (bare
+ * address) transaction.
+ */
+ msg.buffer = NULL;
+ msg.size = 0;
+ err = drm_dp_i2c_do_msg(aux, &msg);
+
+ /*
+ * Reset msg.request in case in case it got
+ * changed into a WRITE_STATUS_UPDATE.
+ */
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
+
+ if (err < 0)
+ break;
+ /* We want each transaction to be as large as possible, but
+ * we'll go to smaller sizes if the hardware gives us a
+ * short reply.
+ */
+ transfer_size = dp_aux_i2c_transfer_size;
+ for (j = 0; j < msgs[i].len; j += msg.size) {
+ msg.buffer = msgs[i].buf + j;
+ msg.size = min(transfer_size, msgs[i].len - j);
+
+ err = drm_dp_i2c_drain_msg(aux, &msg);
+
+ /*
+ * Reset msg.request in case in case it got
+ * changed into a WRITE_STATUS_UPDATE.
+ */
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
+
+ if (err < 0)
+ break;
+ transfer_size = err;
+ }
+ if (err < 0)
+ break;
+ }
+ if (err >= 0)
+ err = num;
+ /* Send a bare address packet to close out the transaction.
+ * Zero sized messages specify an address only (bare
+ * address) transaction.
+ */
+ msg.request &= ~DP_AUX_I2C_MOT;
+ msg.buffer = NULL;
+ msg.size = 0;
+ (void)drm_dp_i2c_do_msg(aux, &msg);
+
+ return err;
+}
+
+static const struct i2c_algorithm drm_dp_i2c_algo = {
+ .functionality = drm_dp_i2c_functionality,
+ .master_xfer = drm_dp_i2c_xfer,
+};
+
+static struct drm_dp_aux *i2c_to_aux(struct i2c_adapter *i2c)
+{
+ return container_of(i2c, struct drm_dp_aux, ddc);
+}
+
+static void lock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ mutex_lock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
+static int trylock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ return mutex_trylock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
+static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ mutex_unlock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
+static const struct i2c_lock_operations drm_dp_i2c_lock_ops = {
+ .lock_bus = lock_bus,
+ .trylock_bus = trylock_bus,
+ .unlock_bus = unlock_bus,
+};
+
+static int drm_dp_aux_get_crc(struct drm_dp_aux *aux, u8 *crc)
+{
+ u8 buf, count;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);
+ if (ret < 0)
+ return ret;
+
+ WARN_ON(!(buf & DP_TEST_SINK_START));
+
+ ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK_MISC, &buf);
+ if (ret < 0)
+ return ret;
+
+ count = buf & DP_TEST_COUNT_MASK;
+ if (count == aux->crc_count)
+ return -EAGAIN; /* No CRC yet */
+
+ aux->crc_count = count;
+
+ /*
+ * At DP_TEST_CRC_R_CR, there's 6 bytes containing CRC data, 2 bytes
+ * per component (RGB or CrYCb).
+ */
+ ret = drm_dp_dpcd_read(aux, DP_TEST_CRC_R_CR, crc, 6);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void drm_dp_aux_crc_work(struct work_struct *work)
+{
+ struct drm_dp_aux *aux = container_of(work, struct drm_dp_aux,
+ crc_work);
+ struct drm_crtc *crtc;
+ u8 crc_bytes[6];
+ uint32_t crcs[3];
+ int ret;
+
+ if (WARN_ON(!aux->crtc))
+ return;
+
+ crtc = aux->crtc;
+ while (crtc->crc.opened) {
+ drm_crtc_wait_one_vblank(crtc);
+ if (!crtc->crc.opened)
+ break;
+
+ ret = drm_dp_aux_get_crc(aux, crc_bytes);
+ if (ret == -EAGAIN) {
+ usleep_range(1000, 2000);
+ ret = drm_dp_aux_get_crc(aux, crc_bytes);
+ }
+
+ if (ret == -EAGAIN) {
+ drm_dbg_kms(aux->drm_dev, "%s: Get CRC failed after retrying: %d\n",
+ aux->name, ret);
+ continue;
+ } else if (ret) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to get a CRC: %d\n", aux->name, ret);
+ continue;
+ }
+
+ crcs[0] = crc_bytes[0] | crc_bytes[1] << 8;
+ crcs[1] = crc_bytes[2] | crc_bytes[3] << 8;
+ crcs[2] = crc_bytes[4] | crc_bytes[5] << 8;
+ drm_crtc_add_crc_entry(crtc, false, 0, crcs);
+ }
+}
+
+/**
+ * drm_dp_remote_aux_init() - minimally initialise a remote aux channel
+ * @aux: DisplayPort AUX channel
+ *
+ * Used for remote aux channel in general. Merely initialize the crc work
+ * struct.
+ */
+void drm_dp_remote_aux_init(struct drm_dp_aux *aux)
+{
+ INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
+}
+EXPORT_SYMBOL(drm_dp_remote_aux_init);
+
+/**
+ * drm_dp_aux_init() - minimally initialise an aux channel
+ * @aux: DisplayPort AUX channel
+ *
+ * If you need to use the drm_dp_aux's i2c adapter prior to registering it with
+ * the outside world, call drm_dp_aux_init() first. For drivers which are
+ * grandparents to their AUX adapters (e.g. the AUX adapter is parented by a
+ * &drm_connector), you must still call drm_dp_aux_register() once the connector
+ * has been registered to allow userspace access to the auxiliary DP channel.
+ * Likewise, for such drivers you should also assign &drm_dp_aux.drm_dev as
+ * early as possible so that the &drm_device that corresponds to the AUX adapter
+ * may be mentioned in debugging output from the DRM DP helpers.
+ *
+ * For devices which use a separate platform device for their AUX adapters, this
+ * may be called as early as required by the driver.
+ *
+ */
+void drm_dp_aux_init(struct drm_dp_aux *aux)
+{
+ mutex_init(&aux->hw_mutex);
+ mutex_init(&aux->cec.lock);
+ INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
+
+ aux->ddc.algo = &drm_dp_i2c_algo;
+ aux->ddc.algo_data = aux;
+ aux->ddc.retries = 3;
+
+ aux->ddc.lock_ops = &drm_dp_i2c_lock_ops;
+}
+EXPORT_SYMBOL(drm_dp_aux_init);
+
+/**
+ * drm_dp_aux_register() - initialise and register aux channel
+ * @aux: DisplayPort AUX channel
+ *
+ * Automatically calls drm_dp_aux_init() if this hasn't been done yet. This
+ * should only be called once the parent of @aux, &drm_dp_aux.dev, is
+ * initialized. For devices which are grandparents of their AUX channels,
+ * &drm_dp_aux.dev will typically be the &drm_connector &device which
+ * corresponds to @aux. For these devices, it's advised to call
+ * drm_dp_aux_register() in &drm_connector_funcs.late_register, and likewise to
+ * call drm_dp_aux_unregister() in &drm_connector_funcs.early_unregister.
+ * Functions which don't follow this will likely Oops when
+ * %CONFIG_DRM_DP_AUX_CHARDEV is enabled.
+ *
+ * For devices where the AUX channel is a device that exists independently of
+ * the &drm_device that uses it, such as SoCs and bridge devices, it is
+ * recommended to call drm_dp_aux_register() after a &drm_device has been
+ * assigned to &drm_dp_aux.drm_dev, and likewise to call
+ * drm_dp_aux_unregister() once the &drm_device should no longer be associated
+ * with the AUX channel (e.g. on bridge detach).
+ *
+ * Drivers which need to use the aux channel before either of the two points
+ * mentioned above need to call drm_dp_aux_init() in order to use the AUX
+ * channel before registration.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_aux_register(struct drm_dp_aux *aux)
+{
+ int ret;
+
+ WARN_ON_ONCE(!aux->drm_dev);
+
+ if (!aux->ddc.algo)
+ drm_dp_aux_init(aux);
+
+ aux->ddc.class = I2C_CLASS_DDC;
+ aux->ddc.owner = THIS_MODULE;
+ aux->ddc.dev.parent = aux->dev;
+
+ strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
+ sizeof(aux->ddc.name));
+
+ ret = drm_dp_aux_register_devnode(aux);
+ if (ret)
+ return ret;
+
+ ret = i2c_add_adapter(&aux->ddc);
+ if (ret) {
+ drm_dp_aux_unregister_devnode(aux);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_aux_register);
+
+/**
+ * drm_dp_aux_unregister() - unregister an AUX adapter
+ * @aux: DisplayPort AUX channel
+ */
+void drm_dp_aux_unregister(struct drm_dp_aux *aux)
+{
+ drm_dp_aux_unregister_devnode(aux);
+ i2c_del_adapter(&aux->ddc);
+}
+EXPORT_SYMBOL(drm_dp_aux_unregister);
+
+#define PSR_SETUP_TIME(x) [DP_PSR_SETUP_TIME_ ## x >> DP_PSR_SETUP_TIME_SHIFT] = (x)
+
+/**
+ * drm_dp_psr_setup_time() - PSR setup in time usec
+ * @psr_cap: PSR capabilities from DPCD
+ *
+ * Returns:
+ * PSR setup time for the panel in microseconds, negative
+ * error code on failure.
+ */
+int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE])
+{
+ static const u16 psr_setup_time_us[] = {
+ PSR_SETUP_TIME(330),
+ PSR_SETUP_TIME(275),
+ PSR_SETUP_TIME(220),
+ PSR_SETUP_TIME(165),
+ PSR_SETUP_TIME(110),
+ PSR_SETUP_TIME(55),
+ PSR_SETUP_TIME(0),
+ };
+ int i;
+
+ i = (psr_cap[1] & DP_PSR_SETUP_TIME_MASK) >> DP_PSR_SETUP_TIME_SHIFT;
+ if (i >= ARRAY_SIZE(psr_setup_time_us))
+ return -EINVAL;
+
+ return psr_setup_time_us[i];
+}
+EXPORT_SYMBOL(drm_dp_psr_setup_time);
+
+#undef PSR_SETUP_TIME
+
+/**
+ * drm_dp_start_crc() - start capture of frame CRCs
+ * @aux: DisplayPort AUX channel
+ * @crtc: CRTC displaying the frames whose CRCs are to be captured
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc)
+{
+ u8 buf;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_TEST_SINK, buf | DP_TEST_SINK_START);
+ if (ret < 0)
+ return ret;
+
+ aux->crc_count = 0;
+ aux->crtc = crtc;
+ schedule_work(&aux->crc_work);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_start_crc);
+
+/**
+ * drm_dp_stop_crc() - stop capture of frame CRCs
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_stop_crc(struct drm_dp_aux *aux)
+{
+ u8 buf;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_TEST_SINK, &buf);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_TEST_SINK, buf & ~DP_TEST_SINK_START);
+ if (ret < 0)
+ return ret;
+
+ flush_work(&aux->crc_work);
+ aux->crtc = NULL;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_stop_crc);
+
+struct dpcd_quirk {
+ u8 oui[3];
+ u8 device_id[6];
+ bool is_branch;
+ u32 quirks;
+};
+
+#define OUI(first, second, third) { (first), (second), (third) }
+#define DEVICE_ID(first, second, third, fourth, fifth, sixth) \
+ { (first), (second), (third), (fourth), (fifth), (sixth) }
+
+#define DEVICE_ID_ANY DEVICE_ID(0, 0, 0, 0, 0, 0)
+
+static const struct dpcd_quirk dpcd_quirk_list[] = {
+ /* Analogix 7737 needs reduced M and N at HBR2 link rates */
+ { OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
+ /* LG LP140WF6-SPM1 eDP panel */
+ { OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
+ /* Apple panels need some additional handling to support PSR */
+ { OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) },
+ /* CH7511 seems to leave SINK_COUNT zeroed */
+ { OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) },
+ /* Synaptics DP1.4 MST hubs can support DSC without virtual DPCD */
+ { OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) },
+ /* Apple MacBookPro 2017 15 inch eDP Retina panel reports too low DP_MAX_LINK_RATE */
+ { OUI(0x00, 0x10, 0xfa), DEVICE_ID(101, 68, 21, 101, 98, 97), false, BIT(DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS) },
+};
+
+#undef OUI
+
+/*
+ * Get a bit mask of DPCD quirks for the sink/branch device identified by
+ * ident. The quirk data is shared but it's up to the drivers to act on the
+ * data.
+ *
+ * For now, only the OUI (first three bytes) is used, but this may be extended
+ * to device identification string and hardware/firmware revisions later.
+ */
+static u32
+drm_dp_get_quirks(const struct drm_dp_dpcd_ident *ident, bool is_branch)
+{
+ const struct dpcd_quirk *quirk;
+ u32 quirks = 0;
+ int i;
+ u8 any_device[] = DEVICE_ID_ANY;
+
+ for (i = 0; i < ARRAY_SIZE(dpcd_quirk_list); i++) {
+ quirk = &dpcd_quirk_list[i];
+
+ if (quirk->is_branch != is_branch)
+ continue;
+
+ if (memcmp(quirk->oui, ident->oui, sizeof(ident->oui)) != 0)
+ continue;
+
+ if (memcmp(quirk->device_id, any_device, sizeof(any_device)) != 0 &&
+ memcmp(quirk->device_id, ident->device_id, sizeof(ident->device_id)) != 0)
+ continue;
+
+ quirks |= quirk->quirks;
+ }
+
+ return quirks;
+}
+
+#undef DEVICE_ID_ANY
+#undef DEVICE_ID
+
+/**
+ * drm_dp_read_desc - read sink/branch descriptor from DPCD
+ * @aux: DisplayPort AUX channel
+ * @desc: Device descriptor to fill from DPCD
+ * @is_branch: true for branch devices, false for sink devices
+ *
+ * Read DPCD 0x400 (sink) or 0x500 (branch) into @desc. Also debug log the
+ * identification.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
+ bool is_branch)
+{
+ struct drm_dp_dpcd_ident *ident = &desc->ident;
+ unsigned int offset = is_branch ? DP_BRANCH_OUI : DP_SINK_OUI;
+ int ret, dev_id_len;
+
+ ret = drm_dp_dpcd_read(aux, offset, ident, sizeof(*ident));
+ if (ret < 0)
+ return ret;
+
+ desc->quirks = drm_dp_get_quirks(ident, is_branch);
+
+ dev_id_len = strnlen(ident->device_id, sizeof(ident->device_id));
+
+ drm_dbg_kms(aux->drm_dev,
+ "%s: DP %s: OUI %*phD dev-ID %*pE HW-rev %d.%d SW-rev %d.%d quirks 0x%04x\n",
+ aux->name, is_branch ? "branch" : "sink",
+ (int)sizeof(ident->oui), ident->oui, dev_id_len,
+ ident->device_id, ident->hw_rev >> 4, ident->hw_rev & 0xf,
+ ident->sw_major_rev, ident->sw_minor_rev, desc->quirks);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_read_desc);
+
+/**
+ * drm_dp_dsc_sink_max_slice_count() - Get the max slice count
+ * supported by the DSC sink.
+ * @dsc_dpcd: DSC capabilities from DPCD
+ * @is_edp: true if its eDP, false for DP
+ *
+ * Read the slice capabilities DPCD register from DSC sink to get
+ * the maximum slice count supported. This is used to populate
+ * the DSC parameters in the &struct drm_dsc_config by the driver.
+ * Driver creates an infoframe using these parameters to populate
+ * &struct drm_dsc_pps_infoframe. These are sent to the sink using DSC
+ * infoframe using the helper function drm_dsc_pps_infoframe_pack()
+ *
+ * Returns:
+ * Maximum slice count supported by DSC sink or 0 its invalid
+ */
+u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
+ bool is_edp)
+{
+ u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
+
+ if (is_edp) {
+ /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
+ if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
+ return 4;
+ if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
+ return 2;
+ if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
+ return 1;
+ } else {
+ /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
+ u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
+
+ if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
+ return 24;
+ if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
+ return 20;
+ if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
+ return 16;
+ if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
+ return 12;
+ if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
+ return 10;
+ if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
+ return 8;
+ if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
+ return 6;
+ if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
+ return 4;
+ if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
+ return 2;
+ if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
+ return 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
+
+/**
+ * drm_dp_dsc_sink_line_buf_depth() - Get the line buffer depth in bits
+ * @dsc_dpcd: DSC capabilities from DPCD
+ *
+ * Read the DSC DPCD register to parse the line buffer depth in bits which is
+ * number of bits of precision within the decoder line buffer supported by
+ * the DSC sink. This is used to populate the DSC parameters in the
+ * &struct drm_dsc_config by the driver.
+ * Driver creates an infoframe using these parameters to populate
+ * &struct drm_dsc_pps_infoframe. These are sent to the sink using DSC
+ * infoframe using the helper function drm_dsc_pps_infoframe_pack()
+ *
+ * Returns:
+ * Line buffer depth supported by DSC panel or 0 its invalid
+ */
+u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
+{
+ u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
+
+ switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
+ case DP_DSC_LINE_BUF_BIT_DEPTH_9:
+ return 9;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_10:
+ return 10;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_11:
+ return 11;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_12:
+ return 12;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_13:
+ return 13;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_14:
+ return 14;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_15:
+ return 15;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_16:
+ return 16;
+ case DP_DSC_LINE_BUF_BIT_DEPTH_8:
+ return 8;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
+
+/**
+ * drm_dp_dsc_sink_supported_input_bpcs() - Get all the input bits per component
+ * values supported by the DSC sink.
+ * @dsc_dpcd: DSC capabilities from DPCD
+ * @dsc_bpc: An array to be filled by this helper with supported
+ * input bpcs.
+ *
+ * Read the DSC DPCD from the sink device to parse the supported bits per
+ * component values. This is used to populate the DSC parameters
+ * in the &struct drm_dsc_config by the driver.
+ * Driver creates an infoframe using these parameters to populate
+ * &struct drm_dsc_pps_infoframe. These are sent to the sink using DSC
+ * infoframe using the helper function drm_dsc_pps_infoframe_pack()
+ *
+ * Returns:
+ * Number of input BPC values parsed from the DPCD
+ */
+int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
+ u8 dsc_bpc[3])
+{
+ int num_bpc = 0;
+ u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
+
+ if (color_depth & DP_DSC_12_BPC)
+ dsc_bpc[num_bpc++] = 12;
+ if (color_depth & DP_DSC_10_BPC)
+ dsc_bpc[num_bpc++] = 10;
+ if (color_depth & DP_DSC_8_BPC)
+ dsc_bpc[num_bpc++] = 8;
+
+ return num_bpc;
+}
+EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs);
+
+static int drm_dp_read_lttpr_regs(struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE], int address,
+ u8 *buf, int buf_size)
+{
+ /*
+ * At least the DELL P2715Q monitor with a DPCD_REV < 0x14 returns
+ * corrupted values when reading from the 0xF0000- range with a block
+ * size bigger than 1.
+ */
+ int block_size = dpcd[DP_DPCD_REV] < 0x14 ? 1 : buf_size;
+ int offset;
+ int ret;
+
+ for (offset = 0; offset < buf_size; offset += block_size) {
+ ret = drm_dp_dpcd_read(aux,
+ address + offset,
+ &buf[offset], block_size);
+ if (ret < 0)
+ return ret;
+
+ WARN_ON(ret != block_size);
+ }
+
+ return 0;
+}
+
+/**
+ * drm_dp_read_lttpr_common_caps - read the LTTPR common capabilities
+ * @aux: DisplayPort AUX channel
+ * @dpcd: DisplayPort configuration data
+ * @caps: buffer to return the capability info in
+ *
+ * Read capabilities common to all LTTPRs.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_read_lttpr_common_caps(struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ u8 caps[DP_LTTPR_COMMON_CAP_SIZE])
+{
+ return drm_dp_read_lttpr_regs(aux, dpcd,
+ DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
+ caps, DP_LTTPR_COMMON_CAP_SIZE);
+}
+EXPORT_SYMBOL(drm_dp_read_lttpr_common_caps);
+
+/**
+ * drm_dp_read_lttpr_phy_caps - read the capabilities for a given LTTPR PHY
+ * @aux: DisplayPort AUX channel
+ * @dpcd: DisplayPort configuration data
+ * @dp_phy: LTTPR PHY to read the capabilities for
+ * @caps: buffer to return the capability info in
+ *
+ * Read the capabilities for the given LTTPR PHY.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ enum drm_dp_phy dp_phy,
+ u8 caps[DP_LTTPR_PHY_CAP_SIZE])
+{
+ return drm_dp_read_lttpr_regs(aux, dpcd,
+ DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER(dp_phy),
+ caps, DP_LTTPR_PHY_CAP_SIZE);
+}
+EXPORT_SYMBOL(drm_dp_read_lttpr_phy_caps);
+
+static u8 dp_lttpr_common_cap(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE], int r)
+{
+ return caps[r - DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
+}
+
+/**
+ * drm_dp_lttpr_count - get the number of detected LTTPRs
+ * @caps: LTTPR common capabilities
+ *
+ * Get the number of detected LTTPRs from the LTTPR common capabilities info.
+ *
+ * Returns:
+ * -ERANGE if more than supported number (8) of LTTPRs are detected
+ * -EINVAL if the DP_PHY_REPEATER_CNT register contains an invalid value
+ * otherwise the number of detected LTTPRs
+ */
+int drm_dp_lttpr_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE])
+{
+ u8 count = dp_lttpr_common_cap(caps, DP_PHY_REPEATER_CNT);
+
+ switch (hweight8(count)) {
+ case 0:
+ return 0;
+ case 1:
+ return 8 - ilog2(count);
+ case 8:
+ return -ERANGE;
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(drm_dp_lttpr_count);
+
+/**
+ * drm_dp_lttpr_max_link_rate - get the maximum link rate supported by all LTTPRs
+ * @caps: LTTPR common capabilities
+ *
+ * Returns the maximum link rate supported by all detected LTTPRs.
+ */
+int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE])
+{
+ u8 rate = dp_lttpr_common_cap(caps, DP_MAX_LINK_RATE_PHY_REPEATER);
+
+ return drm_dp_bw_code_to_link_rate(rate);
+}
+EXPORT_SYMBOL(drm_dp_lttpr_max_link_rate);
+
+/**
+ * drm_dp_lttpr_max_lane_count - get the maximum lane count supported by all LTTPRs
+ * @caps: LTTPR common capabilities
+ *
+ * Returns the maximum lane count supported by all detected LTTPRs.
+ */
+int drm_dp_lttpr_max_lane_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE])
+{
+ u8 max_lanes = dp_lttpr_common_cap(caps, DP_MAX_LANE_COUNT_PHY_REPEATER);
+
+ return max_lanes & DP_MAX_LANE_COUNT_MASK;
+}
+EXPORT_SYMBOL(drm_dp_lttpr_max_lane_count);
+
+/**
+ * drm_dp_lttpr_voltage_swing_level_3_supported - check for LTTPR vswing3 support
+ * @caps: LTTPR PHY capabilities
+ *
+ * Returns true if the @caps for an LTTPR TX PHY indicate support for
+ * voltage swing level 3.
+ */
+bool
+drm_dp_lttpr_voltage_swing_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE])
+{
+ u8 txcap = dp_lttpr_phy_cap(caps, DP_TRANSMITTER_CAPABILITY_PHY_REPEATER1);
+
+ return txcap & DP_VOLTAGE_SWING_LEVEL_3_SUPPORTED;
+}
+EXPORT_SYMBOL(drm_dp_lttpr_voltage_swing_level_3_supported);
+
+/**
+ * drm_dp_lttpr_pre_emphasis_level_3_supported - check for LTTPR preemph3 support
+ * @caps: LTTPR PHY capabilities
+ *
+ * Returns true if the @caps for an LTTPR TX PHY indicate support for
+ * pre-emphasis level 3.
+ */
+bool
+drm_dp_lttpr_pre_emphasis_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE])
+{
+ u8 txcap = dp_lttpr_phy_cap(caps, DP_TRANSMITTER_CAPABILITY_PHY_REPEATER1);
+
+ return txcap & DP_PRE_EMPHASIS_LEVEL_3_SUPPORTED;
+}
+EXPORT_SYMBOL(drm_dp_lttpr_pre_emphasis_level_3_supported);
+
+/**
+ * drm_dp_get_phy_test_pattern() - get the requested pattern from the sink.
+ * @aux: DisplayPort AUX channel
+ * @data: DP phy compliance test parameters.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data)
+{
+ int err;
+ u8 rate, lanes;
+
+ err = drm_dp_dpcd_readb(aux, DP_TEST_LINK_RATE, &rate);
+ if (err < 0)
+ return err;
+ data->link_rate = drm_dp_bw_code_to_link_rate(rate);
+
+ err = drm_dp_dpcd_readb(aux, DP_TEST_LANE_COUNT, &lanes);
+ if (err < 0)
+ return err;
+ data->num_lanes = lanes & DP_MAX_LANE_COUNT_MASK;
+
+ if (lanes & DP_ENHANCED_FRAME_CAP)
+ data->enhanced_frame_cap = true;
+
+ err = drm_dp_dpcd_readb(aux, DP_PHY_TEST_PATTERN, &data->phy_pattern);
+ if (err < 0)
+ return err;
+
+ switch (data->phy_pattern) {
+ case DP_PHY_TEST_PATTERN_80BIT_CUSTOM:
+ err = drm_dp_dpcd_read(aux, DP_TEST_80BIT_CUSTOM_PATTERN_7_0,
+ &data->custom80, sizeof(data->custom80));
+ if (err < 0)
+ return err;
+
+ break;
+ case DP_PHY_TEST_PATTERN_CP2520:
+ err = drm_dp_dpcd_read(aux, DP_TEST_HBR2_SCRAMBLER_RESET,
+ &data->hbr2_reset,
+ sizeof(data->hbr2_reset));
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_get_phy_test_pattern);
+
+/**
+ * drm_dp_set_phy_test_pattern() - set the pattern to the sink.
+ * @aux: DisplayPort AUX channel
+ * @data: DP phy compliance test parameters.
+ * @dp_rev: DP revision to use for compliance testing
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux,
+ struct drm_dp_phy_test_params *data, u8 dp_rev)
+{
+ int err, i;
+ u8 test_pattern;
+
+ test_pattern = data->phy_pattern;
+ if (dp_rev < 0x12) {
+ test_pattern = (test_pattern << 2) &
+ DP_LINK_QUAL_PATTERN_11_MASK;
+ err = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET,
+ test_pattern);
+ if (err < 0)
+ return err;
+ } else {
+ for (i = 0; i < data->num_lanes; i++) {
+ err = drm_dp_dpcd_writeb(aux,
+ DP_LINK_QUAL_LANE0_SET + i,
+ test_pattern);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_set_phy_test_pattern);
+
+static const char *dp_pixelformat_get_name(enum dp_pixelformat pixelformat)
+{
+ if (pixelformat < 0 || pixelformat > DP_PIXELFORMAT_RESERVED)
+ return "Invalid";
+
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "RGB";
+ case DP_PIXELFORMAT_YUV444:
+ return "YUV444";
+ case DP_PIXELFORMAT_YUV422:
+ return "YUV422";
+ case DP_PIXELFORMAT_YUV420:
+ return "YUV420";
+ case DP_PIXELFORMAT_Y_ONLY:
+ return "Y_ONLY";
+ case DP_PIXELFORMAT_RAW:
+ return "RAW";
+ default:
+ return "Reserved";
+ }
+}
+
+static const char *dp_colorimetry_get_name(enum dp_pixelformat pixelformat,
+ enum dp_colorimetry colorimetry)
+{
+ if (pixelformat < 0 || pixelformat > DP_PIXELFORMAT_RESERVED)
+ return "Invalid";
+
+ switch (colorimetry) {
+ case DP_COLORIMETRY_DEFAULT:
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "sRGB";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "BT.601";
+ case DP_PIXELFORMAT_Y_ONLY:
+ return "DICOM PS3.14";
+ case DP_PIXELFORMAT_RAW:
+ return "Custom Color Profile";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_RGB_WIDE_FIXED: /* and DP_COLORIMETRY_BT709_YCC */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "Wide Fixed";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "BT.709";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_RGB_WIDE_FLOAT: /* and DP_COLORIMETRY_XVYCC_601 */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "Wide Float";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "xvYCC 601";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_OPRGB: /* and DP_COLORIMETRY_XVYCC_709 */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "OpRGB";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "xvYCC 709";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_DCI_P3_RGB: /* and DP_COLORIMETRY_SYCC_601 */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "DCI-P3";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "sYCC 601";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_RGB_CUSTOM: /* and DP_COLORIMETRY_OPYCC_601 */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "Custom Profile";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "OpYCC 601";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_BT2020_RGB: /* and DP_COLORIMETRY_BT2020_CYCC */
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_RGB:
+ return "BT.2020 RGB";
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "BT.2020 CYCC";
+ default:
+ return "Reserved";
+ }
+ case DP_COLORIMETRY_BT2020_YCC:
+ switch (pixelformat) {
+ case DP_PIXELFORMAT_YUV444:
+ case DP_PIXELFORMAT_YUV422:
+ case DP_PIXELFORMAT_YUV420:
+ return "BT.2020 YCC";
+ default:
+ return "Reserved";
+ }
+ default:
+ return "Invalid";
+ }
+}
+
+static const char *dp_dynamic_range_get_name(enum dp_dynamic_range dynamic_range)
+{
+ switch (dynamic_range) {
+ case DP_DYNAMIC_RANGE_VESA:
+ return "VESA range";
+ case DP_DYNAMIC_RANGE_CTA:
+ return "CTA range";
+ default:
+ return "Invalid";
+ }
+}
+
+static const char *dp_content_type_get_name(enum dp_content_type content_type)
+{
+ switch (content_type) {
+ case DP_CONTENT_TYPE_NOT_DEFINED:
+ return "Not defined";
+ case DP_CONTENT_TYPE_GRAPHICS:
+ return "Graphics";
+ case DP_CONTENT_TYPE_PHOTO:
+ return "Photo";
+ case DP_CONTENT_TYPE_VIDEO:
+ return "Video";
+ case DP_CONTENT_TYPE_GAME:
+ return "Game";
+ default:
+ return "Reserved";
+ }
+}
+
+void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
+ const struct drm_dp_vsc_sdp *vsc)
+{
+#define DP_SDP_LOG(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
+ DP_SDP_LOG("DP SDP: %s, revision %u, length %u\n", "VSC",
+ vsc->revision, vsc->length);
+ DP_SDP_LOG(" pixelformat: %s\n",
+ dp_pixelformat_get_name(vsc->pixelformat));
+ DP_SDP_LOG(" colorimetry: %s\n",
+ dp_colorimetry_get_name(vsc->pixelformat, vsc->colorimetry));
+ DP_SDP_LOG(" bpc: %u\n", vsc->bpc);
+ DP_SDP_LOG(" dynamic range: %s\n",
+ dp_dynamic_range_get_name(vsc->dynamic_range));
+ DP_SDP_LOG(" content type: %s\n",
+ dp_content_type_get_name(vsc->content_type));
+#undef DP_SDP_LOG
+}
+EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
+
+/**
+ * drm_dp_get_pcon_max_frl_bw() - maximum frl supported by PCON
+ * @dpcd: DisplayPort configuration data
+ * @port_cap: port capabilities
+ *
+ * Returns maximum frl bandwidth supported by PCON in GBPS,
+ * returns 0 if not supported.
+ */
+int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
+ const u8 port_cap[4])
+{
+ int bw;
+ u8 buf;
+
+ buf = port_cap[2];
+ bw = buf & DP_PCON_MAX_FRL_BW;
+
+ switch (bw) {
+ case DP_PCON_MAX_9GBPS:
+ return 9;
+ case DP_PCON_MAX_18GBPS:
+ return 18;
+ case DP_PCON_MAX_24GBPS:
+ return 24;
+ case DP_PCON_MAX_32GBPS:
+ return 32;
+ case DP_PCON_MAX_40GBPS:
+ return 40;
+ case DP_PCON_MAX_48GBPS:
+ return 48;
+ case DP_PCON_MAX_0GBPS:
+ default:
+ return 0;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_get_pcon_max_frl_bw);
+
+/**
+ * drm_dp_pcon_frl_prepare() - Prepare PCON for FRL.
+ * @aux: DisplayPort AUX channel
+ * @enable_frl_ready_hpd: Configure DP_PCON_ENABLE_HPD_READY.
+ *
+ * Returns 0 if success, else returns negative error code.
+ */
+int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd)
+{
+ int ret;
+ u8 buf = DP_PCON_ENABLE_SOURCE_CTL_MODE |
+ DP_PCON_ENABLE_LINK_FRL_MODE;
+
+ if (enable_frl_ready_hpd)
+ buf |= DP_PCON_ENABLE_HPD_READY;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_pcon_frl_prepare);
+
+/**
+ * drm_dp_pcon_is_frl_ready() - Is PCON ready for FRL
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns true if success, else returns false.
+ */
+bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux)
+{
+ int ret;
+ u8 buf;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf);
+ if (ret < 0)
+ return false;
+
+ if (buf & DP_PCON_FRL_READY)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL(drm_dp_pcon_is_frl_ready);
+
+/**
+ * drm_dp_pcon_frl_configure_1() - Set HDMI LINK Configuration-Step1
+ * @aux: DisplayPort AUX channel
+ * @max_frl_gbps: maximum frl bw to be configured between PCON and HDMI sink
+ * @frl_mode: FRL Training mode, it can be either Concurrent or Sequential.
+ * In Concurrent Mode, the FRL link bring up can be done along with
+ * DP Link training. In Sequential mode, the FRL link bring up is done prior to
+ * the DP Link training.
+ *
+ * Returns 0 if success, else returns negative error code.
+ */
+
+int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps,
+ u8 frl_mode)
+{
+ int ret;
+ u8 buf;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf);
+ if (ret < 0)
+ return ret;
+
+ if (frl_mode == DP_PCON_ENABLE_CONCURRENT_LINK)
+ buf |= DP_PCON_ENABLE_CONCURRENT_LINK;
+ else
+ buf &= ~DP_PCON_ENABLE_CONCURRENT_LINK;
+
+ switch (max_frl_gbps) {
+ case 9:
+ buf |= DP_PCON_ENABLE_MAX_BW_9GBPS;
+ break;
+ case 18:
+ buf |= DP_PCON_ENABLE_MAX_BW_18GBPS;
+ break;
+ case 24:
+ buf |= DP_PCON_ENABLE_MAX_BW_24GBPS;
+ break;
+ case 32:
+ buf |= DP_PCON_ENABLE_MAX_BW_32GBPS;
+ break;
+ case 40:
+ buf |= DP_PCON_ENABLE_MAX_BW_40GBPS;
+ break;
+ case 48:
+ buf |= DP_PCON_ENABLE_MAX_BW_48GBPS;
+ break;
+ case 0:
+ buf |= DP_PCON_ENABLE_MAX_BW_0GBPS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_frl_configure_1);
+
+/**
+ * drm_dp_pcon_frl_configure_2() - Set HDMI Link configuration Step-2
+ * @aux: DisplayPort AUX channel
+ * @max_frl_mask : Max FRL BW to be tried by the PCON with HDMI Sink
+ * @frl_type : FRL training type, can be Extended, or Normal.
+ * In Normal FRL training, the PCON tries each frl bw from the max_frl_mask
+ * starting from min, and stops when link training is successful. In Extended
+ * FRL training, all frl bw selected in the mask are trained by the PCON.
+ *
+ * Returns 0 if success, else returns negative error code.
+ */
+int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask,
+ u8 frl_type)
+{
+ int ret;
+ u8 buf = max_frl_mask;
+
+ if (frl_type == DP_PCON_FRL_LINK_TRAIN_EXTENDED)
+ buf |= DP_PCON_FRL_LINK_TRAIN_EXTENDED;
+ else
+ buf &= ~DP_PCON_FRL_LINK_TRAIN_EXTENDED;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_2, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_frl_configure_2);
+
+/**
+ * drm_dp_pcon_reset_frl_config() - Re-Set HDMI Link configuration.
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns 0 if success, else returns negative error code.
+ */
+int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux)
+{
+ int ret;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, 0x0);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_reset_frl_config);
+
+/**
+ * drm_dp_pcon_frl_enable() - Enable HDMI link through FRL
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns 0 if success, else returns negative error code.
+ */
+int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux)
+{
+ int ret;
+ u8 buf = 0;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf);
+ if (ret < 0)
+ return ret;
+ if (!(buf & DP_PCON_ENABLE_SOURCE_CTL_MODE)) {
+ drm_dbg_kms(aux->drm_dev, "%s: PCON in Autonomous mode, can't enable FRL\n",
+ aux->name);
+ return -EINVAL;
+ }
+ buf |= DP_PCON_ENABLE_HDMI_LINK;
+ ret = drm_dp_dpcd_writeb(aux, DP_PCON_HDMI_LINK_CONFIG_1, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_frl_enable);
+
+/**
+ * drm_dp_pcon_hdmi_link_active() - check if the PCON HDMI LINK status is active.
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns true if link is active else returns false.
+ */
+bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux)
+{
+ u8 buf;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_TX_LINK_STATUS, &buf);
+ if (ret < 0)
+ return false;
+
+ return buf & DP_PCON_HDMI_TX_LINK_ACTIVE;
+}
+EXPORT_SYMBOL(drm_dp_pcon_hdmi_link_active);
+
+/**
+ * drm_dp_pcon_hdmi_link_mode() - get the PCON HDMI LINK MODE
+ * @aux: DisplayPort AUX channel
+ * @frl_trained_mask: pointer to store bitmask of the trained bw configuration.
+ * Valid only if the MODE returned is FRL. For Normal Link training mode
+ * only 1 of the bits will be set, but in case of Extended mode, more than
+ * one bits can be set.
+ *
+ * Returns the link mode : TMDS or FRL on success, else returns negative error
+ * code.
+ */
+int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask)
+{
+ u8 buf;
+ int mode;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PCON_HDMI_POST_FRL_STATUS, &buf);
+ if (ret < 0)
+ return ret;
+
+ mode = buf & DP_PCON_HDMI_LINK_MODE;
+
+ if (frl_trained_mask && DP_PCON_HDMI_MODE_FRL == mode)
+ *frl_trained_mask = (buf & DP_PCON_HDMI_FRL_TRAINED_BW) >> 1;
+
+ return mode;
+}
+EXPORT_SYMBOL(drm_dp_pcon_hdmi_link_mode);
+
+/**
+ * drm_dp_pcon_hdmi_frl_link_error_count() - print the error count per lane
+ * during link failure between PCON and HDMI sink
+ * @aux: DisplayPort AUX channel
+ * @connector: DRM connector
+ * code.
+ **/
+
+void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux,
+ struct drm_connector *connector)
+{
+ u8 buf, error_count;
+ int i, num_error;
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+
+ for (i = 0; i < hdmi->max_lanes; i++) {
+ if (drm_dp_dpcd_readb(aux, DP_PCON_HDMI_ERROR_STATUS_LN0 + i, &buf) < 0)
+ return;
+
+ error_count = buf & DP_PCON_HDMI_ERROR_COUNT_MASK;
+ switch (error_count) {
+ case DP_PCON_HDMI_ERROR_COUNT_HUNDRED_PLUS:
+ num_error = 100;
+ break;
+ case DP_PCON_HDMI_ERROR_COUNT_TEN_PLUS:
+ num_error = 10;
+ break;
+ case DP_PCON_HDMI_ERROR_COUNT_THREE_PLUS:
+ num_error = 3;
+ break;
+ default:
+ num_error = 0;
+ }
+
+ drm_err(aux->drm_dev, "%s: More than %d errors since the last read for lane %d",
+ aux->name, num_error, i);
+ }
+}
+EXPORT_SYMBOL(drm_dp_pcon_hdmi_frl_link_error_count);
+
+/*
+ * drm_dp_pcon_enc_is_dsc_1_2 - Does PCON Encoder supports DSC 1.2
+ * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
+ *
+ * Returns true is PCON encoder is DSC 1.2 else returns false.
+ */
+bool drm_dp_pcon_enc_is_dsc_1_2(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
+{
+ u8 buf;
+ u8 major_v, minor_v;
+
+ buf = pcon_dsc_dpcd[DP_PCON_DSC_VERSION - DP_PCON_DSC_ENCODER];
+ major_v = (buf & DP_PCON_DSC_MAJOR_MASK) >> DP_PCON_DSC_MAJOR_SHIFT;
+ minor_v = (buf & DP_PCON_DSC_MINOR_MASK) >> DP_PCON_DSC_MINOR_SHIFT;
+
+ if (major_v == 1 && minor_v == 2)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL(drm_dp_pcon_enc_is_dsc_1_2);
+
+/*
+ * drm_dp_pcon_dsc_max_slices - Get max slices supported by PCON DSC Encoder
+ * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
+ *
+ * Returns maximum no. of slices supported by the PCON DSC Encoder.
+ */
+int drm_dp_pcon_dsc_max_slices(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
+{
+ u8 slice_cap1, slice_cap2;
+
+ slice_cap1 = pcon_dsc_dpcd[DP_PCON_DSC_SLICE_CAP_1 - DP_PCON_DSC_ENCODER];
+ slice_cap2 = pcon_dsc_dpcd[DP_PCON_DSC_SLICE_CAP_2 - DP_PCON_DSC_ENCODER];
+
+ if (slice_cap2 & DP_PCON_DSC_24_PER_DSC_ENC)
+ return 24;
+ if (slice_cap2 & DP_PCON_DSC_20_PER_DSC_ENC)
+ return 20;
+ if (slice_cap2 & DP_PCON_DSC_16_PER_DSC_ENC)
+ return 16;
+ if (slice_cap1 & DP_PCON_DSC_12_PER_DSC_ENC)
+ return 12;
+ if (slice_cap1 & DP_PCON_DSC_10_PER_DSC_ENC)
+ return 10;
+ if (slice_cap1 & DP_PCON_DSC_8_PER_DSC_ENC)
+ return 8;
+ if (slice_cap1 & DP_PCON_DSC_6_PER_DSC_ENC)
+ return 6;
+ if (slice_cap1 & DP_PCON_DSC_4_PER_DSC_ENC)
+ return 4;
+ if (slice_cap1 & DP_PCON_DSC_2_PER_DSC_ENC)
+ return 2;
+ if (slice_cap1 & DP_PCON_DSC_1_PER_DSC_ENC)
+ return 1;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_dsc_max_slices);
+
+/*
+ * drm_dp_pcon_dsc_max_slice_width() - Get max slice width for Pcon DSC encoder
+ * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
+ *
+ * Returns maximum width of the slices in pixel width i.e. no. of pixels x 320.
+ */
+int drm_dp_pcon_dsc_max_slice_width(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
+{
+ u8 buf;
+
+ buf = pcon_dsc_dpcd[DP_PCON_DSC_MAX_SLICE_WIDTH - DP_PCON_DSC_ENCODER];
+
+ return buf * DP_DSC_SLICE_WIDTH_MULTIPLIER;
+}
+EXPORT_SYMBOL(drm_dp_pcon_dsc_max_slice_width);
+
+/*
+ * drm_dp_pcon_dsc_bpp_incr() - Get bits per pixel increment for PCON DSC encoder
+ * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
+ *
+ * Returns the bpp precision supported by the PCON encoder.
+ */
+int drm_dp_pcon_dsc_bpp_incr(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
+{
+ u8 buf;
+
+ buf = pcon_dsc_dpcd[DP_PCON_DSC_BPP_INCR - DP_PCON_DSC_ENCODER];
+
+ switch (buf & DP_PCON_DSC_BPP_INCR_MASK) {
+ case DP_PCON_DSC_ONE_16TH_BPP:
+ return 16;
+ case DP_PCON_DSC_ONE_8TH_BPP:
+ return 8;
+ case DP_PCON_DSC_ONE_4TH_BPP:
+ return 4;
+ case DP_PCON_DSC_ONE_HALF_BPP:
+ return 2;
+ case DP_PCON_DSC_ONE_BPP:
+ return 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_dsc_bpp_incr);
+
+static
+int drm_dp_pcon_configure_dsc_enc(struct drm_dp_aux *aux, u8 pps_buf_config)
+{
+ u8 buf;
+ int ret;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, &buf);
+ if (ret < 0)
+ return ret;
+
+ buf |= DP_PCON_ENABLE_DSC_ENCODER;
+
+ if (pps_buf_config <= DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER) {
+ buf &= ~DP_PCON_ENCODER_PPS_OVERRIDE_MASK;
+ buf |= pps_buf_config << 2;
+ }
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * drm_dp_pcon_pps_default() - Let PCON fill the default pps parameters
+ * for DSC1.2 between PCON & HDMI2.1 sink
+ * @aux: DisplayPort AUX channel
+ *
+ * Returns 0 on success, else returns negative error code.
+ */
+int drm_dp_pcon_pps_default(struct drm_dp_aux *aux)
+{
+ int ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_DISABLED);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_default);
+
+/**
+ * drm_dp_pcon_pps_override_buf() - Configure PPS encoder override buffer for
+ * HDMI sink
+ * @aux: DisplayPort AUX channel
+ * @pps_buf: 128 bytes to be written into PPS buffer for HDMI sink by PCON.
+ *
+ * Returns 0 on success, else returns negative error code.
+ */
+int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128])
+{
+ int ret;
+
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVERRIDE_BASE, &pps_buf, 128);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_override_buf);
+
+/*
+ * drm_dp_pcon_pps_override_param() - Write PPS parameters to DSC encoder
+ * override registers
+ * @aux: DisplayPort AUX channel
+ * @pps_param: 3 Parameters (2 Bytes each) : Slice Width, Slice Height,
+ * bits_per_pixel.
+ *
+ * Returns 0 on success, else returns negative error code.
+ */
+int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6])
+{
+ int ret;
+
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT, &pps_param[0], 2);
+ if (ret < 0)
+ return ret;
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH, &pps_param[2], 2);
+ if (ret < 0)
+ return ret;
+ ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_BPP, &pps_param[4], 2);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_dp_pcon_configure_dsc_enc(aux, DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_pps_override_param);
+
+/*
+ * drm_dp_pcon_convert_rgb_to_ycbcr() - Configure the PCon to convert RGB to Ycbcr
+ * @aux: displayPort AUX channel
+ * @color_spc: Color-space/s for which conversion is to be enabled, 0 for disable.
+ *
+ * Returns 0 on success, else returns negative error code.
+ */
+int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc)
+{
+ int ret;
+ u8 buf;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, &buf);
+ if (ret < 0)
+ return ret;
+
+ if (color_spc & DP_CONVERSION_RGB_YCBCR_MASK)
+ buf |= (color_spc & DP_CONVERSION_RGB_YCBCR_MASK);
+ else
+ buf &= ~DP_CONVERSION_RGB_YCBCR_MASK;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, buf);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_pcon_convert_rgb_to_ycbcr);
+
+/**
+ * drm_edp_backlight_set_level() - Set the backlight level of an eDP panel via AUX
+ * @aux: The DP AUX channel to use
+ * @bl: Backlight capability info from drm_edp_backlight_init()
+ * @level: The brightness level to set
+ *
+ * Sets the brightness level of an eDP panel's backlight. Note that the panel's backlight must
+ * already have been enabled by the driver by calling drm_edp_backlight_enable().
+ *
+ * Returns: %0 on success, negative error code on failure
+ */
+int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,
+ u16 level)
+{
+ int ret;
+ u8 buf[2] = { 0 };
+
+ /* The panel uses the PWM for controlling brightness levels */
+ if (!bl->aux_set)
+ return 0;
+
+ if (bl->lsb_reg_used) {
+ buf[0] = (level & 0xff00) >> 8;
+ buf[1] = (level & 0x00ff);
+ } else {
+ buf[0] = level;
+ }
+
+ ret = drm_dp_dpcd_write(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, sizeof(buf));
+ if (ret != sizeof(buf)) {
+ drm_err(aux->drm_dev,
+ "%s: Failed to write aux backlight level: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_edp_backlight_set_level);
+
+static int
+drm_edp_backlight_set_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,
+ bool enable)
+{
+ int ret;
+ u8 buf;
+
+ /* This panel uses the EDP_BL_PWR GPIO for enablement */
+ if (!bl->aux_enable)
+ return 0;
+
+ ret = drm_dp_dpcd_readb(aux, DP_EDP_DISPLAY_CONTROL_REGISTER, &buf);
+ if (ret != 1) {
+ drm_err(aux->drm_dev, "%s: Failed to read eDP display control register: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+ if (enable)
+ buf |= DP_EDP_BACKLIGHT_ENABLE;
+ else
+ buf &= ~DP_EDP_BACKLIGHT_ENABLE;
+
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_DISPLAY_CONTROL_REGISTER, buf);
+ if (ret != 1) {
+ drm_err(aux->drm_dev, "%s: Failed to write eDP display control register: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * drm_edp_backlight_enable() - Enable an eDP panel's backlight using DPCD
+ * @aux: The DP AUX channel to use
+ * @bl: Backlight capability info from drm_edp_backlight_init()
+ * @level: The initial backlight level to set via AUX, if there is one
+ *
+ * This function handles enabling DPCD backlight controls on a panel over DPCD, while additionally
+ * restoring any important backlight state such as the given backlight level, the brightness byte
+ * count, backlight frequency, etc.
+ *
+ * Note that certain panels do not support being enabled or disabled via DPCD, but instead require
+ * that the driver handle enabling/disabling the panel through implementation-specific means using
+ * the EDP_BL_PWR GPIO. For such panels, &drm_edp_backlight_info.aux_enable will be set to %false,
+ * this function becomes a no-op, and the driver is expected to handle powering the panel on using
+ * the EDP_BL_PWR GPIO.
+ *
+ * Returns: %0 on success, negative error code on failure.
+ */
+int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl,
+ const u16 level)
+{
+ int ret;
+ u8 dpcd_buf;
+
+ if (bl->aux_set)
+ dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
+ else
+ dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_PWM;
+
+ if (bl->pwmgen_bit_count) {
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count);
+ if (ret != 1)
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",
+ aux->name, ret);
+ }
+
+ if (bl->pwm_freq_pre_divider) {
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_FREQ_SET, bl->pwm_freq_pre_divider);
+ if (ret != 1)
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Failed to write aux backlight frequency: %d\n",
+ aux->name, ret);
+ else
+ dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE;
+ }
+
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, dpcd_buf);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ ret = drm_edp_backlight_set_level(aux, bl, level);
+ if (ret < 0)
+ return ret;
+ ret = drm_edp_backlight_set_enable(aux, bl, true);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_edp_backlight_enable);
+
+/**
+ * drm_edp_backlight_disable() - Disable an eDP backlight using DPCD, if supported
+ * @aux: The DP AUX channel to use
+ * @bl: Backlight capability info from drm_edp_backlight_init()
+ *
+ * This function handles disabling DPCD backlight controls on a panel over AUX.
+ *
+ * Note that certain panels do not support being enabled or disabled via DPCD, but instead require
+ * that the driver handle enabling/disabling the panel through implementation-specific means using
+ * the EDP_BL_PWR GPIO. For such panels, &drm_edp_backlight_info.aux_enable will be set to %false,
+ * this function becomes a no-op, and the driver is expected to handle powering the panel off using
+ * the EDP_BL_PWR GPIO.
+ *
+ * Returns: %0 on success or no-op, negative error code on failure.
+ */
+int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl)
+{
+ int ret;
+
+ ret = drm_edp_backlight_set_enable(aux, bl, false);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_edp_backlight_disable);
+
+static inline int
+drm_edp_backlight_probe_max(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
+ u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE])
+{
+ int fxp, fxp_min, fxp_max, fxp_actual, f = 1;
+ int ret;
+ u8 pn, pn_min, pn_max;
+
+ if (!bl->aux_set)
+ return 0;
+
+ ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT, &pn);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap: %d\n",
+ aux->name, ret);
+ return -ENODEV;
+ }
+
+ pn &= DP_EDP_PWMGEN_BIT_COUNT_MASK;
+ bl->max = (1 << pn) - 1;
+ if (!driver_pwm_freq_hz)
+ return 0;
+
+ /*
+ * Set PWM Frequency divider to match desired frequency provided by the driver.
+ * The PWM Frequency is calculated as 27Mhz / (F x P).
+ * - Where F = PWM Frequency Pre-Divider value programmed by field 7:0 of the
+ * EDP_BACKLIGHT_FREQ_SET register (DPCD Address 00728h)
+ * - Where P = 2^Pn, where Pn is the value programmed by field 4:0 of the
+ * EDP_PWMGEN_BIT_COUNT register (DPCD Address 00724h)
+ */
+
+ /* Find desired value of (F x P)
+ * Note that, if F x P is out of supported range, the maximum value or minimum value will
+ * applied automatically. So no need to check that.
+ */
+ fxp = DIV_ROUND_CLOSEST(1000 * DP_EDP_BACKLIGHT_FREQ_BASE_KHZ, driver_pwm_freq_hz);
+
+ /* Use highest possible value of Pn for more granularity of brightness adjustment while
+ * satisfying the conditions below.
+ * - Pn is in the range of Pn_min and Pn_max
+ * - F is in the range of 1 and 255
+ * - FxP is within 25% of desired value.
+ * Note: 25% is arbitrary value and may need some tweak.
+ */
+ ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN, &pn_min);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap min: %d\n",
+ aux->name, ret);
+ return 0;
+ }
+ ret = drm_dp_dpcd_readb(aux, DP_EDP_PWMGEN_BIT_COUNT_CAP_MAX, &pn_max);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to read pwmgen bit count cap max: %d\n",
+ aux->name, ret);
+ return 0;
+ }
+ pn_min &= DP_EDP_PWMGEN_BIT_COUNT_MASK;
+ pn_max &= DP_EDP_PWMGEN_BIT_COUNT_MASK;
+
+ /* Ensure frequency is within 25% of desired value */
+ fxp_min = DIV_ROUND_CLOSEST(fxp * 3, 4);
+ fxp_max = DIV_ROUND_CLOSEST(fxp * 5, 4);
+ if (fxp_min < (1 << pn_min) || (255 << pn_max) < fxp_max) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Driver defined backlight frequency (%d) out of range\n",
+ aux->name, driver_pwm_freq_hz);
+ return 0;
+ }
+
+ for (pn = pn_max; pn >= pn_min; pn--) {
+ f = clamp(DIV_ROUND_CLOSEST(fxp, 1 << pn), 1, 255);
+ fxp_actual = f << pn;
+ if (fxp_min <= fxp_actual && fxp_actual <= fxp_max)
+ break;
+ }
+
+ ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, pn);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n",
+ aux->name, ret);
+ return 0;
+ }
+ bl->pwmgen_bit_count = pn;
+ bl->max = (1 << pn) - 1;
+
+ if (edp_dpcd[2] & DP_EDP_BACKLIGHT_FREQ_AUX_SET_CAP) {
+ bl->pwm_freq_pre_divider = f;
+ drm_dbg_kms(aux->drm_dev, "%s: Using backlight frequency from driver (%dHz)\n",
+ aux->name, driver_pwm_freq_hz);
+ }
+
+ return 0;
+}
+
+static inline int
+drm_edp_backlight_probe_state(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
+ u8 *current_mode)
+{
+ int ret;
+ u8 buf[2];
+ u8 mode_reg;
+
+ ret = drm_dp_dpcd_readb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &mode_reg);
+ if (ret != 1) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to read backlight mode: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ *current_mode = (mode_reg & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK);
+ if (!bl->aux_set)
+ return 0;
+
+ if (*current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
+ int size = 1 + bl->lsb_reg_used;
+
+ ret = drm_dp_dpcd_read(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, size);
+ if (ret != size) {
+ drm_dbg_kms(aux->drm_dev, "%s: Failed to read backlight level: %d\n",
+ aux->name, ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ if (bl->lsb_reg_used)
+ return (buf[0] << 8) | buf[1];
+ else
+ return buf[0];
+ }
+
+ /*
+ * If we're not in DPCD control mode yet, the programmed brightness value is meaningless and
+ * the driver should assume max brightness
+ */
+ return bl->max;
+}
+
+/**
+ * drm_edp_backlight_init() - Probe a display panel's TCON using the standard VESA eDP backlight
+ * interface.
+ * @aux: The DP aux device to use for probing
+ * @bl: The &drm_edp_backlight_info struct to fill out with information on the backlight
+ * @driver_pwm_freq_hz: Optional PWM frequency from the driver in hz
+ * @edp_dpcd: A cached copy of the eDP DPCD
+ * @current_level: Where to store the probed brightness level, if any
+ * @current_mode: Where to store the currently set backlight control mode
+ *
+ * Initializes a &drm_edp_backlight_info struct by probing @aux for it's backlight capabilities,
+ * along with also probing the current and maximum supported brightness levels.
+ *
+ * If @driver_pwm_freq_hz is non-zero, this will be used as the backlight frequency. Otherwise, the
+ * default frequency from the panel is used.
+ *
+ * Returns: %0 on success, negative error code on failure.
+ */
+int
+drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl,
+ u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE],
+ u16 *current_level, u8 *current_mode)
+{
+ int ret;
+
+ if (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP)
+ bl->aux_enable = true;
+ if (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)
+ bl->aux_set = true;
+ if (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
+ bl->lsb_reg_used = true;
+
+ /* Sanity check caps */
+ if (!bl->aux_set && !(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Panel supports neither AUX or PWM brightness control? Aborting\n",
+ aux->name);
+ return -EINVAL;
+ }
+
+ ret = drm_edp_backlight_probe_max(aux, bl, driver_pwm_freq_hz, edp_dpcd);
+ if (ret < 0)
+ return ret;
+
+ ret = drm_edp_backlight_probe_state(aux, bl, current_mode);
+ if (ret < 0)
+ return ret;
+ *current_level = ret;
+
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Found backlight: aux_set=%d aux_enable=%d mode=%d\n",
+ aux->name, bl->aux_set, bl->aux_enable, *current_mode);
+ if (bl->aux_set) {
+ drm_dbg_kms(aux->drm_dev,
+ "%s: Backlight caps: level=%d/%d pwm_freq_pre_divider=%d lsb_reg_used=%d\n",
+ aux->name, *current_level, bl->max, bl->pwm_freq_pre_divider,
+ bl->lsb_reg_used);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_edp_backlight_init);
+
+#if IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
+ (IS_MODULE(CONFIG_DRM_KMS_HELPER) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE))
+
+static int dp_aux_backlight_update_status(struct backlight_device *bd)
+{
+ struct dp_aux_backlight *bl = bl_get_data(bd);
+ u16 brightness = backlight_get_brightness(bd);
+ int ret = 0;
+
+ if (!backlight_is_blank(bd)) {
+ if (!bl->enabled) {
+ drm_edp_backlight_enable(bl->aux, &bl->info, brightness);
+ bl->enabled = true;
+ return 0;
+ }
+ ret = drm_edp_backlight_set_level(bl->aux, &bl->info, brightness);
+ } else {
+ if (bl->enabled) {
+ drm_edp_backlight_disable(bl->aux, &bl->info);
+ bl->enabled = false;
+ }
+ }
+
+ return ret;
+}
+
+static const struct backlight_ops dp_aux_bl_ops = {
+ .update_status = dp_aux_backlight_update_status,
+};
+
+/**
+ * drm_panel_dp_aux_backlight - create and use DP AUX backlight
+ * @panel: DRM panel
+ * @aux: The DP AUX channel to use
+ *
+ * Use this function to create and handle backlight if your panel
+ * supports backlight control over DP AUX channel using DPCD
+ * registers as per VESA's standard backlight control interface.
+ *
+ * When the panel is enabled backlight will be enabled after a
+ * successful call to &drm_panel_funcs.enable()
+ *
+ * When the panel is disabled backlight will be disabled before the
+ * call to &drm_panel_funcs.disable().
+ *
+ * A typical implementation for a panel driver supporting backlight
+ * control over DP AUX will call this function at probe time.
+ * Backlight will then be handled transparently without requiring
+ * any intervention from the driver.
+ *
+ * drm_panel_dp_aux_backlight() must be called after the call to drm_panel_init().
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux)
+{
+ struct dp_aux_backlight *bl;
+ struct backlight_properties props = { 0 };
+ u16 current_level;
+ u8 current_mode;
+ u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
+ int ret;
+
+ if (!panel || !panel->dev || !aux)
+ return -EINVAL;
+
+ ret = drm_dp_dpcd_read(aux, DP_EDP_DPCD_REV, edp_dpcd,
+ EDP_DISPLAY_CTL_CAP_SIZE);
+ if (ret < 0)
+ return ret;
+
+ if (!drm_edp_backlight_supported(edp_dpcd)) {
+ DRM_DEV_INFO(panel->dev, "DP AUX backlight is not supported\n");
+ return 0;
+ }
+
+ bl = devm_kzalloc(panel->dev, sizeof(*bl), GFP_KERNEL);
+ if (!bl)
+ return -ENOMEM;
+
+ bl->aux = aux;
+
+ ret = drm_edp_backlight_init(aux, &bl->info, 0, edp_dpcd,
+ &current_level, &current_mode);
+ if (ret < 0)
+ return ret;
+
+ props.type = BACKLIGHT_RAW;
+ props.brightness = current_level;
+ props.max_brightness = bl->info.max;
+
+ bl->base = devm_backlight_device_register(panel->dev, "dp_aux_backlight",
+ panel->dev, bl,
+ &dp_aux_bl_ops, &props);
+ if (IS_ERR(bl->base))
+ return PTR_ERR(bl->base);
+
+ backlight_disable(bl->base);
+
+ panel->backlight = bl->base;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_panel_dp_aux_backlight);
+
+#endif
diff --git a/drivers/gpu/drm/display/drm_dp_helper_internal.h b/drivers/gpu/drm/display/drm_dp_helper_internal.h
new file mode 100644
index 000000000..8917fc3af
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_helper_internal.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef DRM_DP_HELPER_INTERNAL_H
+#define DRM_DP_HELPER_INTERNAL_H
+
+struct drm_dp_aux;
+
+#ifdef CONFIG_DRM_DP_AUX_CHARDEV
+int drm_dp_aux_dev_init(void);
+void drm_dp_aux_dev_exit(void);
+int drm_dp_aux_register_devnode(struct drm_dp_aux *aux);
+void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux);
+#else
+static inline int drm_dp_aux_dev_init(void)
+{
+ return 0;
+}
+
+static inline void drm_dp_aux_dev_exit(void)
+{
+}
+
+static inline int drm_dp_aux_register_devnode(struct drm_dp_aux *aux)
+{
+ return 0;
+}
+
+static inline void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
+{
+}
+#endif
+
+#endif
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
new file mode 100644
index 000000000..72b2b171e
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -0,0 +1,5929 @@
+/*
+ * Copyright © 2014 Red Hat
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/iopoll.h>
+
+#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
+#include <linux/stacktrace.h>
+#include <linux/sort.h>
+#include <linux/timekeeping.h>
+#include <linux/math64.h>
+#endif
+
+#include <drm/display/drm_dp_mst_helper.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#include "drm_dp_helper_internal.h"
+#include "drm_dp_mst_topology_internal.h"
+
+/**
+ * DOC: dp mst helper
+ *
+ * These functions contain parts of the DisplayPort 1.2a MultiStream Transport
+ * protocol. The helpers contain a topology manager and bandwidth manager.
+ * The helpers encapsulate the sending and received of sideband msgs.
+ */
+struct drm_dp_pending_up_req {
+ struct drm_dp_sideband_msg_hdr hdr;
+ struct drm_dp_sideband_msg_req_body msg;
+ struct list_head next;
+};
+
+static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
+ char *buf);
+
+static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port);
+
+static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
+ int id, u8 start_slot, u8 num_slots);
+
+static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ int offset, int size, u8 *bytes);
+static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ int offset, int size, u8 *bytes);
+
+static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb);
+
+static void
+drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb);
+
+static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port);
+static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
+ u8 *guid);
+
+static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port);
+static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port);
+static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
+
+static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port,
+ struct drm_dp_mst_branch *branch);
+
+#define DBG_PREFIX "[dp_mst]"
+
+#define DP_STR(x) [DP_ ## x] = #x
+
+static const char *drm_dp_mst_req_type_str(u8 req_type)
+{
+ static const char * const req_type_str[] = {
+ DP_STR(GET_MSG_TRANSACTION_VERSION),
+ DP_STR(LINK_ADDRESS),
+ DP_STR(CONNECTION_STATUS_NOTIFY),
+ DP_STR(ENUM_PATH_RESOURCES),
+ DP_STR(ALLOCATE_PAYLOAD),
+ DP_STR(QUERY_PAYLOAD),
+ DP_STR(RESOURCE_STATUS_NOTIFY),
+ DP_STR(CLEAR_PAYLOAD_ID_TABLE),
+ DP_STR(REMOTE_DPCD_READ),
+ DP_STR(REMOTE_DPCD_WRITE),
+ DP_STR(REMOTE_I2C_READ),
+ DP_STR(REMOTE_I2C_WRITE),
+ DP_STR(POWER_UP_PHY),
+ DP_STR(POWER_DOWN_PHY),
+ DP_STR(SINK_EVENT_NOTIFY),
+ DP_STR(QUERY_STREAM_ENC_STATUS),
+ };
+
+ if (req_type >= ARRAY_SIZE(req_type_str) ||
+ !req_type_str[req_type])
+ return "unknown";
+
+ return req_type_str[req_type];
+}
+
+#undef DP_STR
+#define DP_STR(x) [DP_NAK_ ## x] = #x
+
+static const char *drm_dp_mst_nak_reason_str(u8 nak_reason)
+{
+ static const char * const nak_reason_str[] = {
+ DP_STR(WRITE_FAILURE),
+ DP_STR(INVALID_READ),
+ DP_STR(CRC_FAILURE),
+ DP_STR(BAD_PARAM),
+ DP_STR(DEFER),
+ DP_STR(LINK_FAILURE),
+ DP_STR(NO_RESOURCES),
+ DP_STR(DPCD_FAIL),
+ DP_STR(I2C_NAK),
+ DP_STR(ALLOCATE_FAIL),
+ };
+
+ if (nak_reason >= ARRAY_SIZE(nak_reason_str) ||
+ !nak_reason_str[nak_reason])
+ return "unknown";
+
+ return nak_reason_str[nak_reason];
+}
+
+#undef DP_STR
+#define DP_STR(x) [DRM_DP_SIDEBAND_TX_ ## x] = #x
+
+static const char *drm_dp_mst_sideband_tx_state_str(int state)
+{
+ static const char * const sideband_reason_str[] = {
+ DP_STR(QUEUED),
+ DP_STR(START_SEND),
+ DP_STR(SENT),
+ DP_STR(RX),
+ DP_STR(TIMEOUT),
+ };
+
+ if (state >= ARRAY_SIZE(sideband_reason_str) ||
+ !sideband_reason_str[state])
+ return "unknown";
+
+ return sideband_reason_str[state];
+}
+
+static int
+drm_dp_mst_rad_to_str(const u8 rad[8], u8 lct, char *out, size_t len)
+{
+ int i;
+ u8 unpacked_rad[16];
+
+ for (i = 0; i < lct; i++) {
+ if (i % 2)
+ unpacked_rad[i] = rad[i / 2] >> 4;
+ else
+ unpacked_rad[i] = rad[i / 2] & BIT_MASK(4);
+ }
+
+ /* TODO: Eventually add something to printk so we can format the rad
+ * like this: 1.2.3
+ */
+ return snprintf(out, len, "%*phC", lct, unpacked_rad);
+}
+
+/* sideband msg handling */
+static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
+{
+ u8 bitmask = 0x80;
+ u8 bitshift = 7;
+ u8 array_index = 0;
+ int number_of_bits = num_nibbles * 4;
+ u8 remainder = 0;
+
+ while (number_of_bits != 0) {
+ number_of_bits--;
+ remainder <<= 1;
+ remainder |= (data[array_index] & bitmask) >> bitshift;
+ bitmask >>= 1;
+ bitshift--;
+ if (bitmask == 0) {
+ bitmask = 0x80;
+ bitshift = 7;
+ array_index++;
+ }
+ if ((remainder & 0x10) == 0x10)
+ remainder ^= 0x13;
+ }
+
+ number_of_bits = 4;
+ while (number_of_bits != 0) {
+ number_of_bits--;
+ remainder <<= 1;
+ if ((remainder & 0x10) != 0)
+ remainder ^= 0x13;
+ }
+
+ return remainder;
+}
+
+static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
+{
+ u8 bitmask = 0x80;
+ u8 bitshift = 7;
+ u8 array_index = 0;
+ int number_of_bits = number_of_bytes * 8;
+ u16 remainder = 0;
+
+ while (number_of_bits != 0) {
+ number_of_bits--;
+ remainder <<= 1;
+ remainder |= (data[array_index] & bitmask) >> bitshift;
+ bitmask >>= 1;
+ bitshift--;
+ if (bitmask == 0) {
+ bitmask = 0x80;
+ bitshift = 7;
+ array_index++;
+ }
+ if ((remainder & 0x100) == 0x100)
+ remainder ^= 0xd5;
+ }
+
+ number_of_bits = 8;
+ while (number_of_bits != 0) {
+ number_of_bits--;
+ remainder <<= 1;
+ if ((remainder & 0x100) != 0)
+ remainder ^= 0xd5;
+ }
+
+ return remainder & 0xff;
+}
+static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
+{
+ u8 size = 3;
+
+ size += (hdr->lct / 2);
+ return size;
+}
+
+static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
+ u8 *buf, int *len)
+{
+ int idx = 0;
+ int i;
+ u8 crc4;
+
+ buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
+ for (i = 0; i < (hdr->lct / 2); i++)
+ buf[idx++] = hdr->rad[i];
+ buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
+ (hdr->msg_len & 0x3f);
+ buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
+
+ crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
+ buf[idx - 1] |= (crc4 & 0xf);
+
+ *len = idx;
+}
+
+static bool drm_dp_decode_sideband_msg_hdr(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_hdr *hdr,
+ u8 *buf, int buflen, u8 *hdrlen)
+{
+ u8 crc4;
+ u8 len;
+ int i;
+ u8 idx;
+
+ if (buf[0] == 0)
+ return false;
+ len = 3;
+ len += ((buf[0] & 0xf0) >> 4) / 2;
+ if (len > buflen)
+ return false;
+ crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
+
+ if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
+ drm_dbg_kms(mgr->dev, "crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
+ return false;
+ }
+
+ hdr->lct = (buf[0] & 0xf0) >> 4;
+ hdr->lcr = (buf[0] & 0xf);
+ idx = 1;
+ for (i = 0; i < (hdr->lct / 2); i++)
+ hdr->rad[i] = buf[idx++];
+ hdr->broadcast = (buf[idx] >> 7) & 0x1;
+ hdr->path_msg = (buf[idx] >> 6) & 0x1;
+ hdr->msg_len = buf[idx] & 0x3f;
+ idx++;
+ hdr->somt = (buf[idx] >> 7) & 0x1;
+ hdr->eomt = (buf[idx] >> 6) & 0x1;
+ hdr->seqno = (buf[idx] >> 4) & 0x1;
+ idx++;
+ *hdrlen = idx;
+ return true;
+}
+
+void
+drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req,
+ struct drm_dp_sideband_msg_tx *raw)
+{
+ int idx = 0;
+ int i;
+ u8 *buf = raw->msg;
+
+ buf[idx++] = req->req_type & 0x7f;
+
+ switch (req->req_type) {
+ case DP_ENUM_PATH_RESOURCES:
+ case DP_POWER_DOWN_PHY:
+ case DP_POWER_UP_PHY:
+ buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
+ idx++;
+ break;
+ case DP_ALLOCATE_PAYLOAD:
+ buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
+ (req->u.allocate_payload.number_sdp_streams & 0xf);
+ idx++;
+ buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
+ idx++;
+ buf[idx] = (req->u.allocate_payload.pbn >> 8);
+ idx++;
+ buf[idx] = (req->u.allocate_payload.pbn & 0xff);
+ idx++;
+ for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
+ buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
+ (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
+ idx++;
+ }
+ if (req->u.allocate_payload.number_sdp_streams & 1) {
+ i = req->u.allocate_payload.number_sdp_streams - 1;
+ buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
+ idx++;
+ }
+ break;
+ case DP_QUERY_PAYLOAD:
+ buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
+ idx++;
+ buf[idx] = (req->u.query_payload.vcpi & 0x7f);
+ idx++;
+ break;
+ case DP_REMOTE_DPCD_READ:
+ buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
+ buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
+ idx++;
+ buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
+ idx++;
+ buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
+ idx++;
+ buf[idx] = (req->u.dpcd_read.num_bytes);
+ idx++;
+ break;
+
+ case DP_REMOTE_DPCD_WRITE:
+ buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
+ buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
+ idx++;
+ buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
+ idx++;
+ buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
+ idx++;
+ buf[idx] = (req->u.dpcd_write.num_bytes);
+ idx++;
+ memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
+ idx += req->u.dpcd_write.num_bytes;
+ break;
+ case DP_REMOTE_I2C_READ:
+ buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
+ buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
+ idx++;
+ for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
+ buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
+ idx++;
+ buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
+ idx++;
+ memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
+ idx += req->u.i2c_read.transactions[i].num_bytes;
+
+ buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 4;
+ buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
+ idx++;
+ }
+ buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
+ idx++;
+ buf[idx] = (req->u.i2c_read.num_bytes_read);
+ idx++;
+ break;
+
+ case DP_REMOTE_I2C_WRITE:
+ buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
+ idx++;
+ buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
+ idx++;
+ buf[idx] = (req->u.i2c_write.num_bytes);
+ idx++;
+ memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
+ idx += req->u.i2c_write.num_bytes;
+ break;
+ case DP_QUERY_STREAM_ENC_STATUS: {
+ const struct drm_dp_query_stream_enc_status *msg;
+
+ msg = &req->u.enc_status;
+ buf[idx] = msg->stream_id;
+ idx++;
+ memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id));
+ idx += sizeof(msg->client_id);
+ buf[idx] = 0;
+ buf[idx] |= FIELD_PREP(GENMASK(1, 0), msg->stream_event);
+ buf[idx] |= msg->valid_stream_event ? BIT(2) : 0;
+ buf[idx] |= FIELD_PREP(GENMASK(4, 3), msg->stream_behavior);
+ buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0;
+ idx++;
+ }
+ break;
+ }
+ raw->cur_len = idx;
+}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_encode_sideband_req);
+
+/* Decode a sideband request we've encoded, mainly used for debugging */
+int
+drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw,
+ struct drm_dp_sideband_msg_req_body *req)
+{
+ const u8 *buf = raw->msg;
+ int i, idx = 0;
+
+ req->req_type = buf[idx++] & 0x7f;
+ switch (req->req_type) {
+ case DP_ENUM_PATH_RESOURCES:
+ case DP_POWER_DOWN_PHY:
+ case DP_POWER_UP_PHY:
+ req->u.port_num.port_number = (buf[idx] >> 4) & 0xf;
+ break;
+ case DP_ALLOCATE_PAYLOAD:
+ {
+ struct drm_dp_allocate_payload *a =
+ &req->u.allocate_payload;
+
+ a->number_sdp_streams = buf[idx] & 0xf;
+ a->port_number = (buf[idx] >> 4) & 0xf;
+
+ WARN_ON(buf[++idx] & 0x80);
+ a->vcpi = buf[idx] & 0x7f;
+
+ a->pbn = buf[++idx] << 8;
+ a->pbn |= buf[++idx];
+
+ idx++;
+ for (i = 0; i < a->number_sdp_streams; i++) {
+ a->sdp_stream_sink[i] =
+ (buf[idx + (i / 2)] >> ((i % 2) ? 0 : 4)) & 0xf;
+ }
+ }
+ break;
+ case DP_QUERY_PAYLOAD:
+ req->u.query_payload.port_number = (buf[idx] >> 4) & 0xf;
+ WARN_ON(buf[++idx] & 0x80);
+ req->u.query_payload.vcpi = buf[idx] & 0x7f;
+ break;
+ case DP_REMOTE_DPCD_READ:
+ {
+ struct drm_dp_remote_dpcd_read *r = &req->u.dpcd_read;
+
+ r->port_number = (buf[idx] >> 4) & 0xf;
+
+ r->dpcd_address = (buf[idx] << 16) & 0xf0000;
+ r->dpcd_address |= (buf[++idx] << 8) & 0xff00;
+ r->dpcd_address |= buf[++idx] & 0xff;
+
+ r->num_bytes = buf[++idx];
+ }
+ break;
+ case DP_REMOTE_DPCD_WRITE:
+ {
+ struct drm_dp_remote_dpcd_write *w =
+ &req->u.dpcd_write;
+
+ w->port_number = (buf[idx] >> 4) & 0xf;
+
+ w->dpcd_address = (buf[idx] << 16) & 0xf0000;
+ w->dpcd_address |= (buf[++idx] << 8) & 0xff00;
+ w->dpcd_address |= buf[++idx] & 0xff;
+
+ w->num_bytes = buf[++idx];
+
+ w->bytes = kmemdup(&buf[++idx], w->num_bytes,
+ GFP_KERNEL);
+ if (!w->bytes)
+ return -ENOMEM;
+ }
+ break;
+ case DP_REMOTE_I2C_READ:
+ {
+ struct drm_dp_remote_i2c_read *r = &req->u.i2c_read;
+ struct drm_dp_remote_i2c_read_tx *tx;
+ bool failed = false;
+
+ r->num_transactions = buf[idx] & 0x3;
+ r->port_number = (buf[idx] >> 4) & 0xf;
+ for (i = 0; i < r->num_transactions; i++) {
+ tx = &r->transactions[i];
+
+ tx->i2c_dev_id = buf[++idx] & 0x7f;
+ tx->num_bytes = buf[++idx];
+ tx->bytes = kmemdup(&buf[++idx],
+ tx->num_bytes,
+ GFP_KERNEL);
+ if (!tx->bytes) {
+ failed = true;
+ break;
+ }
+ idx += tx->num_bytes;
+ tx->no_stop_bit = (buf[idx] >> 5) & 0x1;
+ tx->i2c_transaction_delay = buf[idx] & 0xf;
+ }
+
+ if (failed) {
+ for (i = 0; i < r->num_transactions; i++) {
+ tx = &r->transactions[i];
+ kfree(tx->bytes);
+ }
+ return -ENOMEM;
+ }
+
+ r->read_i2c_device_id = buf[++idx] & 0x7f;
+ r->num_bytes_read = buf[++idx];
+ }
+ break;
+ case DP_REMOTE_I2C_WRITE:
+ {
+ struct drm_dp_remote_i2c_write *w = &req->u.i2c_write;
+
+ w->port_number = (buf[idx] >> 4) & 0xf;
+ w->write_i2c_device_id = buf[++idx] & 0x7f;
+ w->num_bytes = buf[++idx];
+ w->bytes = kmemdup(&buf[++idx], w->num_bytes,
+ GFP_KERNEL);
+ if (!w->bytes)
+ return -ENOMEM;
+ }
+ break;
+ case DP_QUERY_STREAM_ENC_STATUS:
+ req->u.enc_status.stream_id = buf[idx++];
+ for (i = 0; i < sizeof(req->u.enc_status.client_id); i++)
+ req->u.enc_status.client_id[i] = buf[idx++];
+
+ req->u.enc_status.stream_event = FIELD_GET(GENMASK(1, 0),
+ buf[idx]);
+ req->u.enc_status.valid_stream_event = FIELD_GET(BIT(2),
+ buf[idx]);
+ req->u.enc_status.stream_behavior = FIELD_GET(GENMASK(4, 3),
+ buf[idx]);
+ req->u.enc_status.valid_stream_behavior = FIELD_GET(BIT(5),
+ buf[idx]);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_decode_sideband_req);
+
+void
+drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req,
+ int indent, struct drm_printer *printer)
+{
+ int i;
+
+#define P(f, ...) drm_printf_indent(printer, indent, f, ##__VA_ARGS__)
+ if (req->req_type == DP_LINK_ADDRESS) {
+ /* No contents to print */
+ P("type=%s\n", drm_dp_mst_req_type_str(req->req_type));
+ return;
+ }
+
+ P("type=%s contents:\n", drm_dp_mst_req_type_str(req->req_type));
+ indent++;
+
+ switch (req->req_type) {
+ case DP_ENUM_PATH_RESOURCES:
+ case DP_POWER_DOWN_PHY:
+ case DP_POWER_UP_PHY:
+ P("port=%d\n", req->u.port_num.port_number);
+ break;
+ case DP_ALLOCATE_PAYLOAD:
+ P("port=%d vcpi=%d pbn=%d sdp_streams=%d %*ph\n",
+ req->u.allocate_payload.port_number,
+ req->u.allocate_payload.vcpi, req->u.allocate_payload.pbn,
+ req->u.allocate_payload.number_sdp_streams,
+ req->u.allocate_payload.number_sdp_streams,
+ req->u.allocate_payload.sdp_stream_sink);
+ break;
+ case DP_QUERY_PAYLOAD:
+ P("port=%d vcpi=%d\n",
+ req->u.query_payload.port_number,
+ req->u.query_payload.vcpi);
+ break;
+ case DP_REMOTE_DPCD_READ:
+ P("port=%d dpcd_addr=%05x len=%d\n",
+ req->u.dpcd_read.port_number, req->u.dpcd_read.dpcd_address,
+ req->u.dpcd_read.num_bytes);
+ break;
+ case DP_REMOTE_DPCD_WRITE:
+ P("port=%d addr=%05x len=%d: %*ph\n",
+ req->u.dpcd_write.port_number,
+ req->u.dpcd_write.dpcd_address,
+ req->u.dpcd_write.num_bytes, req->u.dpcd_write.num_bytes,
+ req->u.dpcd_write.bytes);
+ break;
+ case DP_REMOTE_I2C_READ:
+ P("port=%d num_tx=%d id=%d size=%d:\n",
+ req->u.i2c_read.port_number,
+ req->u.i2c_read.num_transactions,
+ req->u.i2c_read.read_i2c_device_id,
+ req->u.i2c_read.num_bytes_read);
+
+ indent++;
+ for (i = 0; i < req->u.i2c_read.num_transactions; i++) {
+ const struct drm_dp_remote_i2c_read_tx *rtx =
+ &req->u.i2c_read.transactions[i];
+
+ P("%d: id=%03d size=%03d no_stop_bit=%d tx_delay=%03d: %*ph\n",
+ i, rtx->i2c_dev_id, rtx->num_bytes,
+ rtx->no_stop_bit, rtx->i2c_transaction_delay,
+ rtx->num_bytes, rtx->bytes);
+ }
+ break;
+ case DP_REMOTE_I2C_WRITE:
+ P("port=%d id=%d size=%d: %*ph\n",
+ req->u.i2c_write.port_number,
+ req->u.i2c_write.write_i2c_device_id,
+ req->u.i2c_write.num_bytes, req->u.i2c_write.num_bytes,
+ req->u.i2c_write.bytes);
+ break;
+ case DP_QUERY_STREAM_ENC_STATUS:
+ P("stream_id=%u client_id=%*ph stream_event=%x "
+ "valid_event=%d stream_behavior=%x valid_behavior=%d",
+ req->u.enc_status.stream_id,
+ (int)ARRAY_SIZE(req->u.enc_status.client_id),
+ req->u.enc_status.client_id, req->u.enc_status.stream_event,
+ req->u.enc_status.valid_stream_event,
+ req->u.enc_status.stream_behavior,
+ req->u.enc_status.valid_stream_behavior);
+ break;
+ default:
+ P("???\n");
+ break;
+ }
+#undef P
+}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_dp_dump_sideband_msg_req_body);
+
+static inline void
+drm_dp_mst_dump_sideband_msg_tx(struct drm_printer *p,
+ const struct drm_dp_sideband_msg_tx *txmsg)
+{
+ struct drm_dp_sideband_msg_req_body req;
+ char buf[64];
+ int ret;
+ int i;
+
+ drm_dp_mst_rad_to_str(txmsg->dst->rad, txmsg->dst->lct, buf,
+ sizeof(buf));
+ drm_printf(p, "txmsg cur_offset=%x cur_len=%x seqno=%x state=%s path_msg=%d dst=%s\n",
+ txmsg->cur_offset, txmsg->cur_len, txmsg->seqno,
+ drm_dp_mst_sideband_tx_state_str(txmsg->state),
+ txmsg->path_msg, buf);
+
+ ret = drm_dp_decode_sideband_req(txmsg, &req);
+ if (ret) {
+ drm_printf(p, "<failed to decode sideband req: %d>\n", ret);
+ return;
+ }
+ drm_dp_dump_sideband_msg_req_body(&req, 1, p);
+
+ switch (req.req_type) {
+ case DP_REMOTE_DPCD_WRITE:
+ kfree(req.u.dpcd_write.bytes);
+ break;
+ case DP_REMOTE_I2C_READ:
+ for (i = 0; i < req.u.i2c_read.num_transactions; i++)
+ kfree(req.u.i2c_read.transactions[i].bytes);
+ break;
+ case DP_REMOTE_I2C_WRITE:
+ kfree(req.u.i2c_write.bytes);
+ break;
+ }
+}
+
+static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
+{
+ u8 crc4;
+
+ crc4 = drm_dp_msg_data_crc4(msg, len);
+ msg[len] = crc4;
+}
+
+static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
+ struct drm_dp_sideband_msg_tx *raw)
+{
+ int idx = 0;
+ u8 *buf = raw->msg;
+
+ buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
+
+ raw->cur_len = idx;
+}
+
+static int drm_dp_sideband_msg_set_header(struct drm_dp_sideband_msg_rx *msg,
+ struct drm_dp_sideband_msg_hdr *hdr,
+ u8 hdrlen)
+{
+ /*
+ * ignore out-of-order messages or messages that are part of a
+ * failed transaction
+ */
+ if (!hdr->somt && !msg->have_somt)
+ return false;
+
+ /* get length contained in this portion */
+ msg->curchunk_idx = 0;
+ msg->curchunk_len = hdr->msg_len;
+ msg->curchunk_hdrlen = hdrlen;
+
+ /* we have already gotten an somt - don't bother parsing */
+ if (hdr->somt && msg->have_somt)
+ return false;
+
+ if (hdr->somt) {
+ memcpy(&msg->initial_hdr, hdr,
+ sizeof(struct drm_dp_sideband_msg_hdr));
+ msg->have_somt = true;
+ }
+ if (hdr->eomt)
+ msg->have_eomt = true;
+
+ return true;
+}
+
+/* this adds a chunk of msg to the builder to get the final msg */
+static bool drm_dp_sideband_append_payload(struct drm_dp_sideband_msg_rx *msg,
+ u8 *replybuf, u8 replybuflen)
+{
+ u8 crc4;
+
+ memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
+ msg->curchunk_idx += replybuflen;
+
+ if (msg->curchunk_idx >= msg->curchunk_len) {
+ /* do CRC */
+ crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
+ if (crc4 != msg->chunk[msg->curchunk_len - 1])
+ print_hex_dump(KERN_DEBUG, "wrong crc",
+ DUMP_PREFIX_NONE, 16, 1,
+ msg->chunk, msg->curchunk_len, false);
+ /* copy chunk into bigger msg */
+ memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
+ msg->curlen += msg->curchunk_len - 1;
+ }
+ return true;
+}
+
+static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+ int i;
+
+ memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
+ idx += 16;
+ repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ for (i = 0; i < repmsg->u.link_addr.nports; i++) {
+ if (raw->msg[idx] & 0x80)
+ repmsg->u.link_addr.ports[i].input_port = 1;
+
+ repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
+ repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
+
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
+ repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
+ if (repmsg->u.link_addr.ports[i].input_port == 0)
+ repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ if (repmsg->u.link_addr.ports[i].input_port == 0) {
+ repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
+ idx += 16;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
+ repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
+ idx++;
+
+ }
+ if (idx > raw->curlen)
+ goto fail_len;
+ }
+
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+
+ memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
+ idx++;
+ /* TODO check */
+ memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
+ repmsg->u.path_resources.fec_capable = raw->msg[idx] & 0x1;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
+ idx += 2;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
+ idx += 2;
+ if (idx > raw->curlen)
+ goto fail_len;
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.allocate_payload.vcpi = raw->msg[idx];
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
+ idx += 2;
+ if (idx > raw->curlen)
+ goto fail_len;
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+ repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
+ idx += 2;
+ if (idx > raw->curlen)
+ goto fail_len;
+ return true;
+fail_len:
+ DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ int idx = 1;
+
+ repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf;
+ idx++;
+ if (idx > raw->curlen) {
+ DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n",
+ idx, raw->curlen);
+ return false;
+ }
+ return true;
+}
+
+static bool
+drm_dp_sideband_parse_query_stream_enc_status(
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+ struct drm_dp_query_stream_enc_status_ack_reply *reply;
+
+ reply = &repmsg->u.enc_status;
+
+ reply->stream_id = raw->msg[3];
+
+ reply->reply_signed = raw->msg[2] & BIT(0);
+
+ /*
+ * NOTE: It's my impression from reading the spec that the below parsing
+ * is correct. However I noticed while testing with an HDCP 1.4 display
+ * through an HDCP 2.2 hub that only bit 3 was set. In that case, I
+ * would expect both bits to be set. So keep the parsing following the
+ * spec, but beware reality might not match the spec (at least for some
+ * configurations).
+ */
+ reply->hdcp_1x_device_present = raw->msg[2] & BIT(4);
+ reply->hdcp_2x_device_present = raw->msg[2] & BIT(3);
+
+ reply->query_capable_device_present = raw->msg[2] & BIT(5);
+ reply->legacy_device_present = raw->msg[2] & BIT(6);
+ reply->unauthorizable_device_present = raw->msg[2] & BIT(7);
+
+ reply->auth_completed = !!(raw->msg[1] & BIT(3));
+ reply->encryption_enabled = !!(raw->msg[1] & BIT(4));
+ reply->repeater_present = !!(raw->msg[1] & BIT(5));
+ reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6;
+
+ return true;
+}
+
+static bool drm_dp_sideband_parse_reply(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_reply_body *msg)
+{
+ memset(msg, 0, sizeof(*msg));
+ msg->reply_type = (raw->msg[0] & 0x80) >> 7;
+ msg->req_type = (raw->msg[0] & 0x7f);
+
+ if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) {
+ memcpy(msg->u.nak.guid, &raw->msg[1], 16);
+ msg->u.nak.reason = raw->msg[17];
+ msg->u.nak.nak_data = raw->msg[18];
+ return false;
+ }
+
+ switch (msg->req_type) {
+ case DP_LINK_ADDRESS:
+ return drm_dp_sideband_parse_link_address(mgr, raw, msg);
+ case DP_QUERY_PAYLOAD:
+ return drm_dp_sideband_parse_query_payload_ack(raw, msg);
+ case DP_REMOTE_DPCD_READ:
+ return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
+ case DP_REMOTE_DPCD_WRITE:
+ return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
+ case DP_REMOTE_I2C_READ:
+ return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
+ case DP_REMOTE_I2C_WRITE:
+ return true; /* since there's nothing to parse */
+ case DP_ENUM_PATH_RESOURCES:
+ return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
+ case DP_ALLOCATE_PAYLOAD:
+ return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
+ case DP_POWER_DOWN_PHY:
+ case DP_POWER_UP_PHY:
+ return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg);
+ case DP_CLEAR_PAYLOAD_ID_TABLE:
+ return true; /* since there's nothing to parse */
+ case DP_QUERY_STREAM_ENC_STATUS:
+ return drm_dp_sideband_parse_query_stream_enc_status(raw, msg);
+ default:
+ drm_err(mgr->dev, "Got unknown reply 0x%02x (%s)\n",
+ msg->req_type, drm_dp_mst_req_type_str(msg->req_type));
+ return false;
+ }
+}
+
+static bool
+drm_dp_sideband_parse_connection_status_notify(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_req_body *msg)
+{
+ int idx = 1;
+
+ msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+
+ memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
+ idx += 16;
+ if (idx > raw->curlen)
+ goto fail_len;
+
+ msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
+ msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
+ msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
+ msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
+ msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
+ idx++;
+ return true;
+fail_len:
+ drm_dbg_kms(mgr->dev, "connection status reply parse length fail %d %d\n",
+ idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_req_body *msg)
+{
+ int idx = 1;
+
+ msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
+ idx++;
+ if (idx > raw->curlen)
+ goto fail_len;
+
+ memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
+ idx += 16;
+ if (idx > raw->curlen)
+ goto fail_len;
+
+ msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
+ idx++;
+ return true;
+fail_len:
+ drm_dbg_kms(mgr->dev, "resource status reply parse length fail %d %d\n", idx, raw->curlen);
+ return false;
+}
+
+static bool drm_dp_sideband_parse_req(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_rx *raw,
+ struct drm_dp_sideband_msg_req_body *msg)
+{
+ memset(msg, 0, sizeof(*msg));
+ msg->req_type = (raw->msg[0] & 0x7f);
+
+ switch (msg->req_type) {
+ case DP_CONNECTION_STATUS_NOTIFY:
+ return drm_dp_sideband_parse_connection_status_notify(mgr, raw, msg);
+ case DP_RESOURCE_STATUS_NOTIFY:
+ return drm_dp_sideband_parse_resource_status_notify(mgr, raw, msg);
+ default:
+ drm_err(mgr->dev, "Got unknown request 0x%02x (%s)\n",
+ msg->req_type, drm_dp_mst_req_type_str(msg->req_type));
+ return false;
+ }
+}
+
+static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg,
+ u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_REMOTE_DPCD_WRITE;
+ req.u.dpcd_write.port_number = port_num;
+ req.u.dpcd_write.dpcd_address = offset;
+ req.u.dpcd_write.num_bytes = num_bytes;
+ req.u.dpcd_write.bytes = bytes;
+ drm_dp_encode_sideband_req(&req, msg);
+}
+
+static void build_link_address(struct drm_dp_sideband_msg_tx *msg)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_LINK_ADDRESS;
+ drm_dp_encode_sideband_req(&req, msg);
+}
+
+static void build_clear_payload_id_table(struct drm_dp_sideband_msg_tx *msg)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_CLEAR_PAYLOAD_ID_TABLE;
+ drm_dp_encode_sideband_req(&req, msg);
+ msg->path_msg = true;
+}
+
+static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg,
+ int port_num)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_ENUM_PATH_RESOURCES;
+ req.u.port_num.port_number = port_num;
+ drm_dp_encode_sideband_req(&req, msg);
+ msg->path_msg = true;
+ return 0;
+}
+
+static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg,
+ int port_num,
+ u8 vcpi, uint16_t pbn,
+ u8 number_sdp_streams,
+ u8 *sdp_stream_sink)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ memset(&req, 0, sizeof(req));
+ req.req_type = DP_ALLOCATE_PAYLOAD;
+ req.u.allocate_payload.port_number = port_num;
+ req.u.allocate_payload.vcpi = vcpi;
+ req.u.allocate_payload.pbn = pbn;
+ req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
+ memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
+ number_sdp_streams);
+ drm_dp_encode_sideband_req(&req, msg);
+ msg->path_msg = true;
+}
+
+static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
+ int port_num, bool power_up)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ if (power_up)
+ req.req_type = DP_POWER_UP_PHY;
+ else
+ req.req_type = DP_POWER_DOWN_PHY;
+
+ req.u.port_num.port_number = port_num;
+ drm_dp_encode_sideband_req(&req, msg);
+ msg->path_msg = true;
+}
+
+static int
+build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id,
+ u8 *q_id)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_QUERY_STREAM_ENC_STATUS;
+ req.u.enc_status.stream_id = stream_id;
+ memcpy(req.u.enc_status.client_id, q_id,
+ sizeof(req.u.enc_status.client_id));
+ req.u.enc_status.stream_event = 0;
+ req.u.enc_status.valid_stream_event = false;
+ req.u.enc_status.stream_behavior = 0;
+ req.u.enc_status.valid_stream_behavior = false;
+
+ drm_dp_encode_sideband_req(&req, msg);
+ return 0;
+}
+
+static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_tx *txmsg)
+{
+ unsigned int state;
+
+ /*
+ * All updates to txmsg->state are protected by mgr->qlock, and the two
+ * cases we check here are terminal states. For those the barriers
+ * provided by the wake_up/wait_event pair are enough.
+ */
+ state = READ_ONCE(txmsg->state);
+ return (state == DRM_DP_SIDEBAND_TX_RX ||
+ state == DRM_DP_SIDEBAND_TX_TIMEOUT);
+}
+
+static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_sideband_msg_tx *txmsg)
+{
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
+ unsigned long wait_timeout = msecs_to_jiffies(4000);
+ unsigned long wait_expires = jiffies + wait_timeout;
+ int ret;
+
+ for (;;) {
+ /*
+ * If the driver provides a way for this, change to
+ * poll-waiting for the MST reply interrupt if we didn't receive
+ * it for 50 msec. This would cater for cases where the HPD
+ * pulse signal got lost somewhere, even though the sink raised
+ * the corresponding MST interrupt correctly. One example is the
+ * Club 3D CAC-1557 TypeC -> DP adapter which for some reason
+ * filters out short pulses with a duration less than ~540 usec.
+ *
+ * The poll period is 50 msec to avoid missing an interrupt
+ * after the sink has cleared it (after a 110msec timeout
+ * since it raised the interrupt).
+ */
+ ret = wait_event_timeout(mgr->tx_waitq,
+ check_txmsg_state(mgr, txmsg),
+ mgr->cbs->poll_hpd_irq ?
+ msecs_to_jiffies(50) :
+ wait_timeout);
+
+ if (ret || !mgr->cbs->poll_hpd_irq ||
+ time_after(jiffies, wait_expires))
+ break;
+
+ mgr->cbs->poll_hpd_irq(mgr);
+ }
+
+ mutex_lock(&mgr->qlock);
+ if (ret > 0) {
+ if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
+ ret = -EIO;
+ goto out;
+ }
+ } else {
+ drm_dbg_kms(mgr->dev, "timedout msg send %p %d %d\n",
+ txmsg, txmsg->state, txmsg->seqno);
+
+ /* dump some state */
+ ret = -EIO;
+
+ /* remove from q */
+ if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
+ txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
+ txmsg->state == DRM_DP_SIDEBAND_TX_SENT)
+ list_del(&txmsg->next);
+ }
+out:
+ if (unlikely(ret == -EIO) && drm_debug_enabled(DRM_UT_DP)) {
+ struct drm_printer p = drm_debug_printer(DBG_PREFIX);
+
+ drm_dp_mst_dump_sideband_msg_tx(&p, txmsg);
+ }
+ mutex_unlock(&mgr->qlock);
+
+ drm_dp_mst_kick_tx(mgr);
+ return ret;
+}
+
+static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
+{
+ struct drm_dp_mst_branch *mstb;
+
+ mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
+ if (!mstb)
+ return NULL;
+
+ mstb->lct = lct;
+ if (lct > 1)
+ memcpy(mstb->rad, rad, lct / 2);
+ INIT_LIST_HEAD(&mstb->ports);
+ kref_init(&mstb->topology_kref);
+ kref_init(&mstb->malloc_kref);
+ return mstb;
+}
+
+static void drm_dp_free_mst_branch_device(struct kref *kref)
+{
+ struct drm_dp_mst_branch *mstb =
+ container_of(kref, struct drm_dp_mst_branch, malloc_kref);
+
+ if (mstb->port_parent)
+ drm_dp_mst_put_port_malloc(mstb->port_parent);
+
+ kfree(mstb);
+}
+
+/**
+ * DOC: Branch device and port refcounting
+ *
+ * Topology refcount overview
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * The refcounting schemes for &struct drm_dp_mst_branch and &struct
+ * drm_dp_mst_port are somewhat unusual. Both ports and branch devices have
+ * two different kinds of refcounts: topology refcounts, and malloc refcounts.
+ *
+ * Topology refcounts are not exposed to drivers, and are handled internally
+ * by the DP MST helpers. The helpers use them in order to prevent the
+ * in-memory topology state from being changed in the middle of critical
+ * operations like changing the internal state of payload allocations. This
+ * means each branch and port will be considered to be connected to the rest
+ * of the topology until its topology refcount reaches zero. Additionally,
+ * for ports this means that their associated &struct drm_connector will stay
+ * registered with userspace until the port's refcount reaches 0.
+ *
+ * Malloc refcount overview
+ * ~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Malloc references are used to keep a &struct drm_dp_mst_port or &struct
+ * drm_dp_mst_branch allocated even after all of its topology references have
+ * been dropped, so that the driver or MST helpers can safely access each
+ * branch's last known state before it was disconnected from the topology.
+ * When the malloc refcount of a port or branch reaches 0, the memory
+ * allocation containing the &struct drm_dp_mst_branch or &struct
+ * drm_dp_mst_port respectively will be freed.
+ *
+ * For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed
+ * to drivers. As of writing this documentation, there are no drivers that
+ * have a usecase for accessing &struct drm_dp_mst_branch outside of the MST
+ * helpers. Exposing this API to drivers in a race-free manner would take more
+ * tweaking of the refcounting scheme, however patches are welcome provided
+ * there is a legitimate driver usecase for this.
+ *
+ * Refcount relationships in a topology
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Let's take a look at why the relationship between topology and malloc
+ * refcounts is designed the way it is.
+ *
+ * .. kernel-figure:: dp-mst/topology-figure-1.dot
+ *
+ * An example of topology and malloc refs in a DP MST topology with two
+ * active payloads. Topology refcount increments are indicated by solid
+ * lines, and malloc refcount increments are indicated by dashed lines.
+ * Each starts from the branch which incremented the refcount, and ends at
+ * the branch to which the refcount belongs to, i.e. the arrow points the
+ * same way as the C pointers used to reference a structure.
+ *
+ * As you can see in the above figure, every branch increments the topology
+ * refcount of its children, and increments the malloc refcount of its
+ * parent. Additionally, every payload increments the malloc refcount of its
+ * assigned port by 1.
+ *
+ * So, what would happen if MSTB #3 from the above figure was unplugged from
+ * the system, but the driver hadn't yet removed payload #2 from port #3? The
+ * topology would start to look like the figure below.
+ *
+ * .. kernel-figure:: dp-mst/topology-figure-2.dot
+ *
+ * Ports and branch devices which have been released from memory are
+ * colored grey, and references which have been removed are colored red.
+ *
+ * Whenever a port or branch device's topology refcount reaches zero, it will
+ * decrement the topology refcounts of all its children, the malloc refcount
+ * of its parent, and finally its own malloc refcount. For MSTB #4 and port
+ * #4, this means they both have been disconnected from the topology and freed
+ * from memory. But, because payload #2 is still holding a reference to port
+ * #3, port #3 is removed from the topology but its &struct drm_dp_mst_port
+ * is still accessible from memory. This also means port #3 has not yet
+ * decremented the malloc refcount of MSTB #3, so its &struct
+ * drm_dp_mst_branch will also stay allocated in memory until port #3's
+ * malloc refcount reaches 0.
+ *
+ * This relationship is necessary because in order to release payload #2, we
+ * need to be able to figure out the last relative of port #3 that's still
+ * connected to the topology. In this case, we would travel up the topology as
+ * shown below.
+ *
+ * .. kernel-figure:: dp-mst/topology-figure-3.dot
+ *
+ * And finally, remove payload #2 by communicating with port #2 through
+ * sideband transactions.
+ */
+
+/**
+ * drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch
+ * device
+ * @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of
+ *
+ * Increments &drm_dp_mst_branch.malloc_kref. When
+ * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb
+ * will be released and @mstb may no longer be used.
+ *
+ * See also: drm_dp_mst_put_mstb_malloc()
+ */
+static void
+drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb)
+{
+ kref_get(&mstb->malloc_kref);
+ drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref));
+}
+
+/**
+ * drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch
+ * device
+ * @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of
+ *
+ * Decrements &drm_dp_mst_branch.malloc_kref. When
+ * &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb
+ * will be released and @mstb may no longer be used.
+ *
+ * See also: drm_dp_mst_get_mstb_malloc()
+ */
+static void
+drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb)
+{
+ drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1);
+ kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device);
+}
+
+static void drm_dp_free_mst_port(struct kref *kref)
+{
+ struct drm_dp_mst_port *port =
+ container_of(kref, struct drm_dp_mst_port, malloc_kref);
+
+ drm_dp_mst_put_mstb_malloc(port->parent);
+ kfree(port);
+}
+
+/**
+ * drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port
+ * @port: The &struct drm_dp_mst_port to increment the malloc refcount of
+ *
+ * Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref
+ * reaches 0, the memory allocation for @port will be released and @port may
+ * no longer be used.
+ *
+ * Because @port could potentially be freed at any time by the DP MST helpers
+ * if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this
+ * function, drivers that which to make use of &struct drm_dp_mst_port should
+ * ensure that they grab at least one main malloc reference to their MST ports
+ * in &drm_dp_mst_topology_cbs.add_connector. This callback is called before
+ * there is any chance for &drm_dp_mst_port.malloc_kref to reach 0.
+ *
+ * See also: drm_dp_mst_put_port_malloc()
+ */
+void
+drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port)
+{
+ kref_get(&port->malloc_kref);
+ drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref));
+}
+EXPORT_SYMBOL(drm_dp_mst_get_port_malloc);
+
+/**
+ * drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port
+ * @port: The &struct drm_dp_mst_port to decrement the malloc refcount of
+ *
+ * Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref
+ * reaches 0, the memory allocation for @port will be released and @port may
+ * no longer be used.
+ *
+ * See also: drm_dp_mst_get_port_malloc()
+ */
+void
+drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port)
+{
+ drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1);
+ kref_put(&port->malloc_kref, drm_dp_free_mst_port);
+}
+EXPORT_SYMBOL(drm_dp_mst_put_port_malloc);
+
+#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
+
+#define STACK_DEPTH 8
+
+static noinline void
+__topology_ref_save(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_topology_ref_history *history,
+ enum drm_dp_mst_topology_ref_type type)
+{
+ struct drm_dp_mst_topology_ref_entry *entry = NULL;
+ depot_stack_handle_t backtrace;
+ ulong stack_entries[STACK_DEPTH];
+ uint n;
+ int i;
+
+ n = stack_trace_save(stack_entries, ARRAY_SIZE(stack_entries), 1);
+ backtrace = stack_depot_save(stack_entries, n, GFP_KERNEL);
+ if (!backtrace)
+ return;
+
+ /* Try to find an existing entry for this backtrace */
+ for (i = 0; i < history->len; i++) {
+ if (history->entries[i].backtrace == backtrace) {
+ entry = &history->entries[i];
+ break;
+ }
+ }
+
+ /* Otherwise add one */
+ if (!entry) {
+ struct drm_dp_mst_topology_ref_entry *new;
+ int new_len = history->len + 1;
+
+ new = krealloc(history->entries, sizeof(*new) * new_len,
+ GFP_KERNEL);
+ if (!new)
+ return;
+
+ entry = &new[history->len];
+ history->len = new_len;
+ history->entries = new;
+
+ entry->backtrace = backtrace;
+ entry->type = type;
+ entry->count = 0;
+ }
+ entry->count++;
+ entry->ts_nsec = ktime_get_ns();
+}
+
+static int
+topology_ref_history_cmp(const void *a, const void *b)
+{
+ const struct drm_dp_mst_topology_ref_entry *entry_a = a, *entry_b = b;
+
+ if (entry_a->ts_nsec > entry_b->ts_nsec)
+ return 1;
+ else if (entry_a->ts_nsec < entry_b->ts_nsec)
+ return -1;
+ else
+ return 0;
+}
+
+static inline const char *
+topology_ref_type_to_str(enum drm_dp_mst_topology_ref_type type)
+{
+ if (type == DRM_DP_MST_TOPOLOGY_REF_GET)
+ return "get";
+ else
+ return "put";
+}
+
+static void
+__dump_topology_ref_history(struct drm_dp_mst_topology_ref_history *history,
+ void *ptr, const char *type_str)
+{
+ struct drm_printer p = drm_debug_printer(DBG_PREFIX);
+ char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ int i;
+
+ if (!buf)
+ return;
+
+ if (!history->len)
+ goto out;
+
+ /* First, sort the list so that it goes from oldest to newest
+ * reference entry
+ */
+ sort(history->entries, history->len, sizeof(*history->entries),
+ topology_ref_history_cmp, NULL);
+
+ drm_printf(&p, "%s (%p) topology count reached 0, dumping history:\n",
+ type_str, ptr);
+
+ for (i = 0; i < history->len; i++) {
+ const struct drm_dp_mst_topology_ref_entry *entry =
+ &history->entries[i];
+ u64 ts_nsec = entry->ts_nsec;
+ u32 rem_nsec = do_div(ts_nsec, 1000000000);
+
+ stack_depot_snprint(entry->backtrace, buf, PAGE_SIZE, 4);
+
+ drm_printf(&p, " %d %ss (last at %5llu.%06u):\n%s",
+ entry->count,
+ topology_ref_type_to_str(entry->type),
+ ts_nsec, rem_nsec / 1000, buf);
+ }
+
+ /* Now free the history, since this is the only time we expose it */
+ kfree(history->entries);
+out:
+ kfree(buf);
+}
+
+static __always_inline void
+drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb)
+{
+ __dump_topology_ref_history(&mstb->topology_ref_history, mstb,
+ "MSTB");
+}
+
+static __always_inline void
+drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port)
+{
+ __dump_topology_ref_history(&port->topology_ref_history, port,
+ "Port");
+}
+
+static __always_inline void
+save_mstb_topology_ref(struct drm_dp_mst_branch *mstb,
+ enum drm_dp_mst_topology_ref_type type)
+{
+ __topology_ref_save(mstb->mgr, &mstb->topology_ref_history, type);
+}
+
+static __always_inline void
+save_port_topology_ref(struct drm_dp_mst_port *port,
+ enum drm_dp_mst_topology_ref_type type)
+{
+ __topology_ref_save(port->mgr, &port->topology_ref_history, type);
+}
+
+static inline void
+topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr)
+{
+ mutex_lock(&mgr->topology_ref_history_lock);
+}
+
+static inline void
+topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr)
+{
+ mutex_unlock(&mgr->topology_ref_history_lock);
+}
+#else
+static inline void
+topology_ref_history_lock(struct drm_dp_mst_topology_mgr *mgr) {}
+static inline void
+topology_ref_history_unlock(struct drm_dp_mst_topology_mgr *mgr) {}
+static inline void
+drm_dp_mst_dump_mstb_topology_history(struct drm_dp_mst_branch *mstb) {}
+static inline void
+drm_dp_mst_dump_port_topology_history(struct drm_dp_mst_port *port) {}
+#define save_mstb_topology_ref(mstb, type)
+#define save_port_topology_ref(port, type)
+#endif
+
+struct drm_dp_mst_atomic_payload *
+drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_atomic_payload *payload;
+
+ list_for_each_entry(payload, &state->payloads, next)
+ if (payload->port == port)
+ return payload;
+
+ return NULL;
+}
+EXPORT_SYMBOL(drm_atomic_get_mst_payload_state);
+
+static void drm_dp_destroy_mst_branch_device(struct kref *kref)
+{
+ struct drm_dp_mst_branch *mstb =
+ container_of(kref, struct drm_dp_mst_branch, topology_kref);
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
+
+ drm_dp_mst_dump_mstb_topology_history(mstb);
+
+ INIT_LIST_HEAD(&mstb->destroy_next);
+
+ /*
+ * This can get called under mgr->mutex, so we need to perform the
+ * actual destruction of the mstb in another worker
+ */
+ mutex_lock(&mgr->delayed_destroy_lock);
+ list_add(&mstb->destroy_next, &mgr->destroy_branch_device_list);
+ mutex_unlock(&mgr->delayed_destroy_lock);
+ queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);
+}
+
+/**
+ * drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a
+ * branch device unless it's zero
+ * @mstb: &struct drm_dp_mst_branch to increment the topology refcount of
+ *
+ * Attempts to grab a topology reference to @mstb, if it hasn't yet been
+ * removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has
+ * reached 0). Holding a topology reference implies that a malloc reference
+ * will be held to @mstb as long as the user holds the topology reference.
+ *
+ * Care should be taken to ensure that the user has at least one malloc
+ * reference to @mstb. If you already have a topology reference to @mstb, you
+ * should use drm_dp_mst_topology_get_mstb() instead.
+ *
+ * See also:
+ * drm_dp_mst_topology_get_mstb()
+ * drm_dp_mst_topology_put_mstb()
+ *
+ * Returns:
+ * * 1: A topology reference was grabbed successfully
+ * * 0: @port is no longer in the topology, no reference was grabbed
+ */
+static int __must_check
+drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb)
+{
+ int ret;
+
+ topology_ref_history_lock(mstb->mgr);
+ ret = kref_get_unless_zero(&mstb->topology_kref);
+ if (ret) {
+ drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));
+ save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET);
+ }
+
+ topology_ref_history_unlock(mstb->mgr);
+
+ return ret;
+}
+
+/**
+ * drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a
+ * branch device
+ * @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of
+ *
+ * Increments &drm_dp_mst_branch.topology_refcount without checking whether or
+ * not it's already reached 0. This is only valid to use in scenarios where
+ * you are already guaranteed to have at least one active topology reference
+ * to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used.
+ *
+ * See also:
+ * drm_dp_mst_topology_try_get_mstb()
+ * drm_dp_mst_topology_put_mstb()
+ */
+static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb)
+{
+ topology_ref_history_lock(mstb->mgr);
+
+ save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_GET);
+ WARN_ON(kref_read(&mstb->topology_kref) == 0);
+ kref_get(&mstb->topology_kref);
+ drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));
+
+ topology_ref_history_unlock(mstb->mgr);
+}
+
+/**
+ * drm_dp_mst_topology_put_mstb() - release a topology reference to a branch
+ * device
+ * @mstb: The &struct drm_dp_mst_branch to release the topology reference from
+ *
+ * Releases a topology reference from @mstb by decrementing
+ * &drm_dp_mst_branch.topology_kref.
+ *
+ * See also:
+ * drm_dp_mst_topology_try_get_mstb()
+ * drm_dp_mst_topology_get_mstb()
+ */
+static void
+drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb)
+{
+ topology_ref_history_lock(mstb->mgr);
+
+ drm_dbg(mstb->mgr->dev, "mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref) - 1);
+ save_mstb_topology_ref(mstb, DRM_DP_MST_TOPOLOGY_REF_PUT);
+
+ topology_ref_history_unlock(mstb->mgr);
+ kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device);
+}
+
+static void drm_dp_destroy_port(struct kref *kref)
+{
+ struct drm_dp_mst_port *port =
+ container_of(kref, struct drm_dp_mst_port, topology_kref);
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+
+ drm_dp_mst_dump_port_topology_history(port);
+
+ /* There's nothing that needs locking to destroy an input port yet */
+ if (port->input) {
+ drm_dp_mst_put_port_malloc(port);
+ return;
+ }
+
+ kfree(port->cached_edid);
+
+ /*
+ * we can't destroy the connector here, as we might be holding the
+ * mode_config.mutex from an EDID retrieval
+ */
+ mutex_lock(&mgr->delayed_destroy_lock);
+ list_add(&port->next, &mgr->destroy_port_list);
+ mutex_unlock(&mgr->delayed_destroy_lock);
+ queue_work(mgr->delayed_destroy_wq, &mgr->delayed_destroy_work);
+}
+
+/**
+ * drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a
+ * port unless it's zero
+ * @port: &struct drm_dp_mst_port to increment the topology refcount of
+ *
+ * Attempts to grab a topology reference to @port, if it hasn't yet been
+ * removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached
+ * 0). Holding a topology reference implies that a malloc reference will be
+ * held to @port as long as the user holds the topology reference.
+ *
+ * Care should be taken to ensure that the user has at least one malloc
+ * reference to @port. If you already have a topology reference to @port, you
+ * should use drm_dp_mst_topology_get_port() instead.
+ *
+ * See also:
+ * drm_dp_mst_topology_get_port()
+ * drm_dp_mst_topology_put_port()
+ *
+ * Returns:
+ * * 1: A topology reference was grabbed successfully
+ * * 0: @port is no longer in the topology, no reference was grabbed
+ */
+static int __must_check
+drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port)
+{
+ int ret;
+
+ topology_ref_history_lock(port->mgr);
+ ret = kref_get_unless_zero(&port->topology_kref);
+ if (ret) {
+ drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));
+ save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET);
+ }
+
+ topology_ref_history_unlock(port->mgr);
+ return ret;
+}
+
+/**
+ * drm_dp_mst_topology_get_port() - Increment the topology refcount of a port
+ * @port: The &struct drm_dp_mst_port to increment the topology refcount of
+ *
+ * Increments &drm_dp_mst_port.topology_refcount without checking whether or
+ * not it's already reached 0. This is only valid to use in scenarios where
+ * you are already guaranteed to have at least one active topology reference
+ * to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used.
+ *
+ * See also:
+ * drm_dp_mst_topology_try_get_port()
+ * drm_dp_mst_topology_put_port()
+ */
+static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port)
+{
+ topology_ref_history_lock(port->mgr);
+
+ WARN_ON(kref_read(&port->topology_kref) == 0);
+ kref_get(&port->topology_kref);
+ drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref));
+ save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_GET);
+
+ topology_ref_history_unlock(port->mgr);
+}
+
+/**
+ * drm_dp_mst_topology_put_port() - release a topology reference to a port
+ * @port: The &struct drm_dp_mst_port to release the topology reference from
+ *
+ * Releases a topology reference from @port by decrementing
+ * &drm_dp_mst_port.topology_kref.
+ *
+ * See also:
+ * drm_dp_mst_topology_try_get_port()
+ * drm_dp_mst_topology_get_port()
+ */
+static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port)
+{
+ topology_ref_history_lock(port->mgr);
+
+ drm_dbg(port->mgr->dev, "port %p (%d)\n", port, kref_read(&port->topology_kref) - 1);
+ save_port_topology_ref(port, DRM_DP_MST_TOPOLOGY_REF_PUT);
+
+ topology_ref_history_unlock(port->mgr);
+ kref_put(&port->topology_kref, drm_dp_destroy_port);
+}
+
+static struct drm_dp_mst_branch *
+drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_branch *to_find)
+{
+ struct drm_dp_mst_port *port;
+ struct drm_dp_mst_branch *rmstb;
+
+ if (to_find == mstb)
+ return mstb;
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ if (port->mstb) {
+ rmstb = drm_dp_mst_topology_get_mstb_validated_locked(
+ port->mstb, to_find);
+ if (rmstb)
+ return rmstb;
+ }
+ }
+ return NULL;
+}
+
+static struct drm_dp_mst_branch *
+drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_mst_branch *rmstb = NULL;
+
+ mutex_lock(&mgr->lock);
+ if (mgr->mst_primary) {
+ rmstb = drm_dp_mst_topology_get_mstb_validated_locked(
+ mgr->mst_primary, mstb);
+
+ if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb))
+ rmstb = NULL;
+ }
+ mutex_unlock(&mgr->lock);
+ return rmstb;
+}
+
+static struct drm_dp_mst_port *
+drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *to_find)
+{
+ struct drm_dp_mst_port *port, *mport;
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ if (port == to_find)
+ return port;
+
+ if (port->mstb) {
+ mport = drm_dp_mst_topology_get_port_validated_locked(
+ port->mstb, to_find);
+ if (mport)
+ return mport;
+ }
+ }
+ return NULL;
+}
+
+static struct drm_dp_mst_port *
+drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_port *rport = NULL;
+
+ mutex_lock(&mgr->lock);
+ if (mgr->mst_primary) {
+ rport = drm_dp_mst_topology_get_port_validated_locked(
+ mgr->mst_primary, port);
+
+ if (rport && !drm_dp_mst_topology_try_get_port(rport))
+ rport = NULL;
+ }
+ mutex_unlock(&mgr->lock);
+ return rport;
+}
+
+static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
+{
+ struct drm_dp_mst_port *port;
+ int ret;
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ if (port->port_num == port_num) {
+ ret = drm_dp_mst_topology_try_get_port(port);
+ return ret ? port : NULL;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * calculate a new RAD for this MST branch device
+ * if parent has an LCT of 2 then it has 1 nibble of RAD,
+ * if parent has an LCT of 3 then it has 2 nibbles of RAD,
+ */
+static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
+ u8 *rad)
+{
+ int parent_lct = port->parent->lct;
+ int shift = 4;
+ int idx = (parent_lct - 1) / 2;
+
+ if (parent_lct > 1) {
+ memcpy(rad, port->parent->rad, idx + 1);
+ shift = (parent_lct % 2) ? 4 : 0;
+ } else
+ rad[0] = 0;
+
+ rad[idx] |= port->port_num << shift;
+ return parent_lct + 1;
+}
+
+static bool drm_dp_mst_is_end_device(u8 pdt, bool mcs)
+{
+ switch (pdt) {
+ case DP_PEER_DEVICE_DP_LEGACY_CONV:
+ case DP_PEER_DEVICE_SST_SINK:
+ return true;
+ case DP_PEER_DEVICE_MST_BRANCHING:
+ /* For sst branch device */
+ if (!mcs)
+ return true;
+
+ return false;
+ }
+ return true;
+}
+
+static int
+drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt,
+ bool new_mcs)
+{
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ struct drm_dp_mst_branch *mstb;
+ u8 rad[8], lct;
+ int ret = 0;
+
+ if (port->pdt == new_pdt && port->mcs == new_mcs)
+ return 0;
+
+ /* Teardown the old pdt, if there is one */
+ if (port->pdt != DP_PEER_DEVICE_NONE) {
+ if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
+ /*
+ * If the new PDT would also have an i2c bus,
+ * don't bother with reregistering it
+ */
+ if (new_pdt != DP_PEER_DEVICE_NONE &&
+ drm_dp_mst_is_end_device(new_pdt, new_mcs)) {
+ port->pdt = new_pdt;
+ port->mcs = new_mcs;
+ return 0;
+ }
+
+ /* remove i2c over sideband */
+ drm_dp_mst_unregister_i2c_bus(port);
+ } else {
+ mutex_lock(&mgr->lock);
+ drm_dp_mst_topology_put_mstb(port->mstb);
+ port->mstb = NULL;
+ mutex_unlock(&mgr->lock);
+ }
+ }
+
+ port->pdt = new_pdt;
+ port->mcs = new_mcs;
+
+ if (port->pdt != DP_PEER_DEVICE_NONE) {
+ if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
+ /* add i2c over sideband */
+ ret = drm_dp_mst_register_i2c_bus(port);
+ } else {
+ lct = drm_dp_calculate_rad(port, rad);
+ mstb = drm_dp_add_mst_branch_device(lct, rad);
+ if (!mstb) {
+ ret = -ENOMEM;
+ drm_err(mgr->dev, "Failed to create MSTB for port %p", port);
+ goto out;
+ }
+
+ mutex_lock(&mgr->lock);
+ port->mstb = mstb;
+ mstb->mgr = port->mgr;
+ mstb->port_parent = port;
+
+ /*
+ * Make sure this port's memory allocation stays
+ * around until its child MSTB releases it
+ */
+ drm_dp_mst_get_port_malloc(port);
+ mutex_unlock(&mgr->lock);
+
+ /* And make sure we send a link address for this */
+ ret = 1;
+ }
+ }
+
+out:
+ if (ret < 0)
+ port->pdt = DP_PEER_DEVICE_NONE;
+ return ret;
+}
+
+/**
+ * drm_dp_mst_dpcd_read() - read a series of bytes from the DPCD via sideband
+ * @aux: Fake sideband AUX CH
+ * @offset: address of the (first) register to read
+ * @buffer: buffer to store the register values
+ * @size: number of bytes in @buffer
+ *
+ * Performs the same functionality for remote devices via
+ * sideband messaging as drm_dp_dpcd_read() does for local
+ * devices via actual AUX CH.
+ *
+ * Return: Number of bytes read, or negative error code on failure.
+ */
+ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,
+ unsigned int offset, void *buffer, size_t size)
+{
+ struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port,
+ aux);
+
+ return drm_dp_send_dpcd_read(port->mgr, port,
+ offset, size, buffer);
+}
+
+/**
+ * drm_dp_mst_dpcd_write() - write a series of bytes to the DPCD via sideband
+ * @aux: Fake sideband AUX CH
+ * @offset: address of the (first) register to write
+ * @buffer: buffer containing the values to write
+ * @size: number of bytes in @buffer
+ *
+ * Performs the same functionality for remote devices via
+ * sideband messaging as drm_dp_dpcd_write() does for local
+ * devices via actual AUX CH.
+ *
+ * Return: number of bytes written on success, negative error code on failure.
+ */
+ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
+ unsigned int offset, void *buffer, size_t size)
+{
+ struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port,
+ aux);
+
+ return drm_dp_send_dpcd_write(port->mgr, port,
+ offset, size, buffer);
+}
+
+static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
+{
+ int ret = 0;
+
+ memcpy(mstb->guid, guid, 16);
+
+ if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
+ if (mstb->port_parent) {
+ ret = drm_dp_send_dpcd_write(mstb->mgr,
+ mstb->port_parent,
+ DP_GUID, 16, mstb->guid);
+ } else {
+ ret = drm_dp_dpcd_write(mstb->mgr->aux,
+ DP_GUID, mstb->guid, 16);
+ }
+ }
+
+ if (ret < 16 && ret > 0)
+ return -EPROTO;
+
+ return ret == 16 ? 0 : ret;
+}
+
+static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
+ int pnum,
+ char *proppath,
+ size_t proppath_size)
+{
+ int i;
+ char temp[8];
+
+ snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
+ for (i = 0; i < (mstb->lct - 1); i++) {
+ int shift = (i % 2) ? 0 : 4;
+ int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
+
+ snprintf(temp, sizeof(temp), "-%d", port_num);
+ strlcat(proppath, temp, proppath_size);
+ }
+ snprintf(temp, sizeof(temp), "-%d", pnum);
+ strlcat(proppath, temp, proppath_size);
+}
+
+/**
+ * drm_dp_mst_connector_late_register() - Late MST connector registration
+ * @connector: The MST connector
+ * @port: The MST port for this connector
+ *
+ * Helper to register the remote aux device for this MST port. Drivers should
+ * call this from their mst connector's late_register hook to enable MST aux
+ * devices.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int drm_dp_mst_connector_late_register(struct drm_connector *connector,
+ struct drm_dp_mst_port *port)
+{
+ drm_dbg_kms(port->mgr->dev, "registering %s remote bus for %s\n",
+ port->aux.name, connector->kdev->kobj.name);
+
+ port->aux.dev = connector->kdev;
+ return drm_dp_aux_register_devnode(&port->aux);
+}
+EXPORT_SYMBOL(drm_dp_mst_connector_late_register);
+
+/**
+ * drm_dp_mst_connector_early_unregister() - Early MST connector unregistration
+ * @connector: The MST connector
+ * @port: The MST port for this connector
+ *
+ * Helper to unregister the remote aux device for this MST port, registered by
+ * drm_dp_mst_connector_late_register(). Drivers should call this from their mst
+ * connector's early_unregister hook.
+ */
+void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
+ struct drm_dp_mst_port *port)
+{
+ drm_dbg_kms(port->mgr->dev, "unregistering %s remote bus for %s\n",
+ port->aux.name, connector->kdev->kobj.name);
+ drm_dp_aux_unregister_devnode(&port->aux);
+}
+EXPORT_SYMBOL(drm_dp_mst_connector_early_unregister);
+
+static void
+drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ char proppath[255];
+ int ret;
+
+ build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
+ port->connector = mgr->cbs->add_connector(mgr, port, proppath);
+ if (!port->connector) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if (port->pdt != DP_PEER_DEVICE_NONE &&
+ drm_dp_mst_is_end_device(port->pdt, port->mcs) &&
+ port->port_num >= DP_MST_LOGICAL_PORT_0)
+ port->cached_edid = drm_get_edid(port->connector,
+ &port->aux.ddc);
+
+ drm_connector_register(port->connector);
+ return;
+
+error:
+ drm_err(mgr->dev, "Failed to create connector for port %p: %d\n", port, ret);
+}
+
+/*
+ * Drop a topology reference, and unlink the port from the in-memory topology
+ * layout
+ */
+static void
+drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
+{
+ mutex_lock(&mgr->lock);
+ port->parent->num_ports--;
+ list_del(&port->next);
+ mutex_unlock(&mgr->lock);
+ drm_dp_mst_topology_put_port(port);
+}
+
+static struct drm_dp_mst_port *
+drm_dp_mst_add_port(struct drm_device *dev,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb, u8 port_number)
+{
+ struct drm_dp_mst_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
+
+ if (!port)
+ return NULL;
+
+ kref_init(&port->topology_kref);
+ kref_init(&port->malloc_kref);
+ port->parent = mstb;
+ port->port_num = port_number;
+ port->mgr = mgr;
+ port->aux.name = "DPMST";
+ port->aux.dev = dev->dev;
+ port->aux.is_remote = true;
+
+ /* initialize the MST downstream port's AUX crc work queue */
+ port->aux.drm_dev = dev;
+ drm_dp_remote_aux_init(&port->aux);
+
+ /*
+ * Make sure the memory allocation for our parent branch stays
+ * around until our own memory allocation is released
+ */
+ drm_dp_mst_get_mstb_malloc(mstb);
+
+ return port;
+}
+
+static int
+drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb,
+ struct drm_device *dev,
+ struct drm_dp_link_addr_reply_port *port_msg)
+{
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
+ struct drm_dp_mst_port *port;
+ int old_ddps = 0, ret;
+ u8 new_pdt = DP_PEER_DEVICE_NONE;
+ bool new_mcs = 0;
+ bool created = false, send_link_addr = false, changed = false;
+
+ port = drm_dp_get_port(mstb, port_msg->port_number);
+ if (!port) {
+ port = drm_dp_mst_add_port(dev, mgr, mstb,
+ port_msg->port_number);
+ if (!port)
+ return -ENOMEM;
+ created = true;
+ changed = true;
+ } else if (!port->input && port_msg->input_port && port->connector) {
+ /* Since port->connector can't be changed here, we create a
+ * new port if input_port changes from 0 to 1
+ */
+ drm_dp_mst_topology_unlink_port(mgr, port);
+ drm_dp_mst_topology_put_port(port);
+ port = drm_dp_mst_add_port(dev, mgr, mstb,
+ port_msg->port_number);
+ if (!port)
+ return -ENOMEM;
+ changed = true;
+ created = true;
+ } else if (port->input && !port_msg->input_port) {
+ changed = true;
+ } else if (port->connector) {
+ /* We're updating a port that's exposed to userspace, so do it
+ * under lock
+ */
+ drm_modeset_lock(&mgr->base.lock, NULL);
+
+ old_ddps = port->ddps;
+ changed = port->ddps != port_msg->ddps ||
+ (port->ddps &&
+ (port->ldps != port_msg->legacy_device_plug_status ||
+ port->dpcd_rev != port_msg->dpcd_revision ||
+ port->mcs != port_msg->mcs ||
+ port->pdt != port_msg->peer_device_type ||
+ port->num_sdp_stream_sinks !=
+ port_msg->num_sdp_stream_sinks));
+ }
+
+ port->input = port_msg->input_port;
+ if (!port->input)
+ new_pdt = port_msg->peer_device_type;
+ new_mcs = port_msg->mcs;
+ port->ddps = port_msg->ddps;
+ port->ldps = port_msg->legacy_device_plug_status;
+ port->dpcd_rev = port_msg->dpcd_revision;
+ port->num_sdp_streams = port_msg->num_sdp_streams;
+ port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
+
+ /* manage mstb port lists with mgr lock - take a reference
+ for this list */
+ if (created) {
+ mutex_lock(&mgr->lock);
+ drm_dp_mst_topology_get_port(port);
+ list_add(&port->next, &mstb->ports);
+ mstb->num_ports++;
+ mutex_unlock(&mgr->lock);
+ }
+
+ /*
+ * Reprobe PBN caps on both hotplug, and when re-probing the link
+ * for our parent mstb
+ */
+ if (old_ddps != port->ddps || !created) {
+ if (port->ddps && !port->input) {
+ ret = drm_dp_send_enum_path_resources(mgr, mstb,
+ port);
+ if (ret == 1)
+ changed = true;
+ } else {
+ port->full_pbn = 0;
+ }
+ }
+
+ ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs);
+ if (ret == 1) {
+ send_link_addr = true;
+ } else if (ret < 0) {
+ drm_err(dev, "Failed to change PDT on port %p: %d\n", port, ret);
+ goto fail;
+ }
+
+ /*
+ * If this port wasn't just created, then we're reprobing because
+ * we're coming out of suspend. In this case, always resend the link
+ * address if there's an MSTB on this port
+ */
+ if (!created && port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&
+ port->mcs)
+ send_link_addr = true;
+
+ if (port->connector)
+ drm_modeset_unlock(&mgr->base.lock);
+ else if (!port->input)
+ drm_dp_mst_port_add_connector(mstb, port);
+
+ if (send_link_addr && port->mstb) {
+ ret = drm_dp_send_link_address(mgr, port->mstb);
+ if (ret == 1) /* MSTB below us changed */
+ changed = true;
+ else if (ret < 0)
+ goto fail_put;
+ }
+
+ /* put reference to this port */
+ drm_dp_mst_topology_put_port(port);
+ return changed;
+
+fail:
+ drm_dp_mst_topology_unlink_port(mgr, port);
+ if (port->connector)
+ drm_modeset_unlock(&mgr->base.lock);
+fail_put:
+ drm_dp_mst_topology_put_port(port);
+ return ret;
+}
+
+static int
+drm_dp_mst_handle_conn_stat(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_connection_status_notify *conn_stat)
+{
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
+ struct drm_dp_mst_port *port;
+ int old_ddps, ret;
+ u8 new_pdt;
+ bool new_mcs;
+ bool dowork = false, create_connector = false;
+
+ port = drm_dp_get_port(mstb, conn_stat->port_number);
+ if (!port)
+ return 0;
+
+ if (port->connector) {
+ if (!port->input && conn_stat->input_port) {
+ /*
+ * We can't remove a connector from an already exposed
+ * port, so just throw the port out and make sure we
+ * reprobe the link address of it's parent MSTB
+ */
+ drm_dp_mst_topology_unlink_port(mgr, port);
+ mstb->link_address_sent = false;
+ dowork = true;
+ goto out;
+ }
+
+ /* Locking is only needed if the port's exposed to userspace */
+ drm_modeset_lock(&mgr->base.lock, NULL);
+ } else if (port->input && !conn_stat->input_port) {
+ create_connector = true;
+ /* Reprobe link address so we get num_sdp_streams */
+ mstb->link_address_sent = false;
+ dowork = true;
+ }
+
+ old_ddps = port->ddps;
+ port->input = conn_stat->input_port;
+ port->ldps = conn_stat->legacy_device_plug_status;
+ port->ddps = conn_stat->displayport_device_plug_status;
+
+ if (old_ddps != port->ddps) {
+ if (port->ddps && !port->input)
+ drm_dp_send_enum_path_resources(mgr, mstb, port);
+ else
+ port->full_pbn = 0;
+ }
+
+ new_pdt = port->input ? DP_PEER_DEVICE_NONE : conn_stat->peer_device_type;
+ new_mcs = conn_stat->message_capability_status;
+ ret = drm_dp_port_set_pdt(port, new_pdt, new_mcs);
+ if (ret == 1) {
+ dowork = true;
+ } else if (ret < 0) {
+ drm_err(mgr->dev, "Failed to change PDT for port %p: %d\n", port, ret);
+ dowork = false;
+ }
+
+ if (port->connector)
+ drm_modeset_unlock(&mgr->base.lock);
+ else if (create_connector)
+ drm_dp_mst_port_add_connector(mstb, port);
+
+out:
+ drm_dp_mst_topology_put_port(port);
+ return dowork;
+}
+
+static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
+ u8 lct, u8 *rad)
+{
+ struct drm_dp_mst_branch *mstb;
+ struct drm_dp_mst_port *port;
+ int i, ret;
+ /* find the port by iterating down */
+
+ mutex_lock(&mgr->lock);
+ mstb = mgr->mst_primary;
+
+ if (!mstb)
+ goto out;
+
+ for (i = 0; i < lct - 1; i++) {
+ int shift = (i % 2) ? 0 : 4;
+ int port_num = (rad[i / 2] >> shift) & 0xf;
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ if (port->port_num == port_num) {
+ mstb = port->mstb;
+ if (!mstb) {
+ drm_err(mgr->dev,
+ "failed to lookup MSTB with lct %d, rad %02x\n",
+ lct, rad[0]);
+ goto out;
+ }
+
+ break;
+ }
+ }
+ }
+ ret = drm_dp_mst_topology_try_get_mstb(mstb);
+ if (!ret)
+ mstb = NULL;
+out:
+ mutex_unlock(&mgr->lock);
+ return mstb;
+}
+
+static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
+ struct drm_dp_mst_branch *mstb,
+ const uint8_t *guid)
+{
+ struct drm_dp_mst_branch *found_mstb;
+ struct drm_dp_mst_port *port;
+
+ if (!mstb)
+ return NULL;
+
+ if (memcmp(mstb->guid, guid, 16) == 0)
+ return mstb;
+
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
+
+ if (found_mstb)
+ return found_mstb;
+ }
+
+ return NULL;
+}
+
+static struct drm_dp_mst_branch *
+drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr,
+ const uint8_t *guid)
+{
+ struct drm_dp_mst_branch *mstb;
+ int ret;
+
+ /* find the port by iterating down */
+ mutex_lock(&mgr->lock);
+
+ mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
+ if (mstb) {
+ ret = drm_dp_mst_topology_try_get_mstb(mstb);
+ if (!ret)
+ mstb = NULL;
+ }
+
+ mutex_unlock(&mgr->lock);
+ return mstb;
+}
+
+static int drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_mst_port *port;
+ int ret;
+ bool changed = false;
+
+ if (!mstb->link_address_sent) {
+ ret = drm_dp_send_link_address(mgr, mstb);
+ if (ret == 1)
+ changed = true;
+ else if (ret < 0)
+ return ret;
+ }
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ if (port->input || !port->ddps || !port->mstb)
+ continue;
+
+ ret = drm_dp_check_and_send_link_address(mgr, port->mstb);
+ if (ret == 1)
+ changed = true;
+ else if (ret < 0)
+ return ret;
+ }
+
+ return changed;
+}
+
+static void drm_dp_mst_link_probe_work(struct work_struct *work)
+{
+ struct drm_dp_mst_topology_mgr *mgr =
+ container_of(work, struct drm_dp_mst_topology_mgr, work);
+ struct drm_device *dev = mgr->dev;
+ struct drm_dp_mst_branch *mstb;
+ int ret;
+ bool clear_payload_id_table;
+
+ mutex_lock(&mgr->probe_lock);
+
+ mutex_lock(&mgr->lock);
+ clear_payload_id_table = !mgr->payload_id_table_cleared;
+ mgr->payload_id_table_cleared = true;
+
+ mstb = mgr->mst_primary;
+ if (mstb) {
+ ret = drm_dp_mst_topology_try_get_mstb(mstb);
+ if (!ret)
+ mstb = NULL;
+ }
+ mutex_unlock(&mgr->lock);
+ if (!mstb) {
+ mutex_unlock(&mgr->probe_lock);
+ return;
+ }
+
+ /*
+ * Certain branch devices seem to incorrectly report an available_pbn
+ * of 0 on downstream sinks, even after clearing the
+ * DP_PAYLOAD_ALLOCATE_* registers in
+ * drm_dp_mst_topology_mgr_set_mst(). Namely, the CableMatters USB-C
+ * 2x DP hub. Sending a CLEAR_PAYLOAD_ID_TABLE message seems to make
+ * things work again.
+ */
+ if (clear_payload_id_table) {
+ drm_dbg_kms(dev, "Clearing payload ID table\n");
+ drm_dp_send_clear_payload_id_table(mgr, mstb);
+ }
+
+ ret = drm_dp_check_and_send_link_address(mgr, mstb);
+ drm_dp_mst_topology_put_mstb(mstb);
+
+ mutex_unlock(&mgr->probe_lock);
+ if (ret > 0)
+ drm_kms_helper_hotplug_event(dev);
+}
+
+static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
+ u8 *guid)
+{
+ u64 salt;
+
+ if (memchr_inv(guid, 0, 16))
+ return true;
+
+ salt = get_jiffies_64();
+
+ memcpy(&guid[0], &salt, sizeof(u64));
+ memcpy(&guid[8], &salt, sizeof(u64));
+
+ return false;
+}
+
+static void build_dpcd_read(struct drm_dp_sideband_msg_tx *msg,
+ u8 port_num, u32 offset, u8 num_bytes)
+{
+ struct drm_dp_sideband_msg_req_body req;
+
+ req.req_type = DP_REMOTE_DPCD_READ;
+ req.u.dpcd_read.port_number = port_num;
+ req.u.dpcd_read.dpcd_address = offset;
+ req.u.dpcd_read.num_bytes = num_bytes;
+ drm_dp_encode_sideband_req(&req, msg);
+}
+
+static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
+ bool up, u8 *msg, int len)
+{
+ int ret;
+ int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
+ int tosend, total, offset;
+ int retries = 0;
+
+retry:
+ total = len;
+ offset = 0;
+ do {
+ tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
+
+ ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
+ &msg[offset],
+ tosend);
+ if (ret != tosend) {
+ if (ret == -EIO && retries < 5) {
+ retries++;
+ goto retry;
+ }
+ drm_dbg_kms(mgr->dev, "failed to dpcd write %d %d\n", tosend, ret);
+
+ return -EIO;
+ }
+ offset += tosend;
+ total -= tosend;
+ } while (total > 0);
+ return 0;
+}
+
+static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
+ struct drm_dp_sideband_msg_tx *txmsg)
+{
+ struct drm_dp_mst_branch *mstb = txmsg->dst;
+ u8 req_type;
+
+ req_type = txmsg->msg[0] & 0x7f;
+ if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
+ req_type == DP_RESOURCE_STATUS_NOTIFY ||
+ req_type == DP_CLEAR_PAYLOAD_ID_TABLE)
+ hdr->broadcast = 1;
+ else
+ hdr->broadcast = 0;
+ hdr->path_msg = txmsg->path_msg;
+ if (hdr->broadcast) {
+ hdr->lct = 1;
+ hdr->lcr = 6;
+ } else {
+ hdr->lct = mstb->lct;
+ hdr->lcr = mstb->lct - 1;
+ }
+
+ memcpy(hdr->rad, mstb->rad, hdr->lct / 2);
+
+ return 0;
+}
+/*
+ * process a single block of the next message in the sideband queue
+ */
+static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_tx *txmsg,
+ bool up)
+{
+ u8 chunk[48];
+ struct drm_dp_sideband_msg_hdr hdr;
+ int len, space, idx, tosend;
+ int ret;
+
+ if (txmsg->state == DRM_DP_SIDEBAND_TX_SENT)
+ return 0;
+
+ memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
+
+ if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED)
+ txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
+
+ /* make hdr from dst mst */
+ ret = set_hdr_from_dst_qlock(&hdr, txmsg);
+ if (ret < 0)
+ return ret;
+
+ /* amount left to send in this message */
+ len = txmsg->cur_len - txmsg->cur_offset;
+
+ /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
+ space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
+
+ tosend = min(len, space);
+ if (len == txmsg->cur_len)
+ hdr.somt = 1;
+ if (space >= len)
+ hdr.eomt = 1;
+
+
+ hdr.msg_len = tosend + 1;
+ drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
+ memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
+ /* add crc at end */
+ drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
+ idx += tosend + 1;
+
+ ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
+ if (ret) {
+ if (drm_debug_enabled(DRM_UT_DP)) {
+ struct drm_printer p = drm_debug_printer(DBG_PREFIX);
+
+ drm_printf(&p, "sideband msg failed to send\n");
+ drm_dp_mst_dump_sideband_msg_tx(&p, txmsg);
+ }
+ return ret;
+ }
+
+ txmsg->cur_offset += tosend;
+ if (txmsg->cur_offset == txmsg->cur_len) {
+ txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
+ return 1;
+ }
+ return 0;
+}
+
+static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ int ret;
+
+ WARN_ON(!mutex_is_locked(&mgr->qlock));
+
+ /* construct a chunk from the first msg in the tx_msg queue */
+ if (list_empty(&mgr->tx_msg_downq))
+ return;
+
+ txmsg = list_first_entry(&mgr->tx_msg_downq,
+ struct drm_dp_sideband_msg_tx, next);
+ ret = process_single_tx_qlock(mgr, txmsg, false);
+ if (ret < 0) {
+ drm_dbg_kms(mgr->dev, "failed to send msg in q %d\n", ret);
+ list_del(&txmsg->next);
+ txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
+ wake_up_all(&mgr->tx_waitq);
+ }
+}
+
+static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_sideband_msg_tx *txmsg)
+{
+ mutex_lock(&mgr->qlock);
+ list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
+
+ if (drm_debug_enabled(DRM_UT_DP)) {
+ struct drm_printer p = drm_debug_printer(DBG_PREFIX);
+
+ drm_dp_mst_dump_sideband_msg_tx(&p, txmsg);
+ }
+
+ if (list_is_singular(&mgr->tx_msg_downq))
+ process_single_down_tx_qlock(mgr);
+ mutex_unlock(&mgr->qlock);
+}
+
+static void
+drm_dp_dump_link_address(const struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_link_address_ack_reply *reply)
+{
+ struct drm_dp_link_addr_reply_port *port_reply;
+ int i;
+
+ for (i = 0; i < reply->nports; i++) {
+ port_reply = &reply->ports[i];
+ drm_dbg_kms(mgr->dev,
+ "port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n",
+ i,
+ port_reply->input_port,
+ port_reply->peer_device_type,
+ port_reply->port_number,
+ port_reply->dpcd_revision,
+ port_reply->mcs,
+ port_reply->ddps,
+ port_reply->legacy_device_plug_status,
+ port_reply->num_sdp_streams,
+ port_reply->num_sdp_stream_sinks);
+ }
+}
+
+static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ struct drm_dp_link_address_ack_reply *reply;
+ struct drm_dp_mst_port *port, *tmp;
+ int i, ret, port_mask = 0;
+ bool changed = false;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg)
+ return -ENOMEM;
+
+ txmsg->dst = mstb;
+ build_link_address(txmsg);
+
+ mstb->link_address_sent = true;
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ /* FIXME: Actually do some real error handling here */
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret <= 0) {
+ drm_err(mgr->dev, "Sending link address failed with %d\n", ret);
+ goto out;
+ }
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ drm_err(mgr->dev, "link address NAK received\n");
+ ret = -EIO;
+ goto out;
+ }
+
+ reply = &txmsg->reply.u.link_addr;
+ drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports);
+ drm_dp_dump_link_address(mgr, reply);
+
+ ret = drm_dp_check_mstb_guid(mstb, reply->guid);
+ if (ret) {
+ char buf[64];
+
+ drm_dp_mst_rad_to_str(mstb->rad, mstb->lct, buf, sizeof(buf));
+ drm_err(mgr->dev, "GUID check on %s failed: %d\n", buf, ret);
+ goto out;
+ }
+
+ for (i = 0; i < reply->nports; i++) {
+ port_mask |= BIT(reply->ports[i].port_number);
+ ret = drm_dp_mst_handle_link_address_port(mstb, mgr->dev,
+ &reply->ports[i]);
+ if (ret == 1)
+ changed = true;
+ else if (ret < 0)
+ goto out;
+ }
+
+ /* Prune any ports that are currently a part of mstb in our in-memory
+ * topology, but were not seen in this link address. Usually this
+ * means that they were removed while the topology was out of sync,
+ * e.g. during suspend/resume
+ */
+ mutex_lock(&mgr->lock);
+ list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
+ if (port_mask & BIT(port->port_num))
+ continue;
+
+ drm_dbg_kms(mgr->dev, "port %d was not in link address, removing\n",
+ port->port_num);
+ list_del(&port->next);
+ drm_dp_mst_topology_put_port(port);
+ changed = true;
+ }
+ mutex_unlock(&mgr->lock);
+
+out:
+ if (ret <= 0)
+ mstb->link_address_sent = false;
+ kfree(txmsg);
+ return ret < 0 ? ret : changed;
+}
+
+static void
+drm_dp_send_clear_payload_id_table(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ int ret;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg)
+ return;
+
+ txmsg->dst = mstb;
+ build_clear_payload_id_table(txmsg);
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0 && txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ drm_dbg_kms(mgr->dev, "clear payload table id nak received\n");
+
+ kfree(txmsg);
+}
+
+static int
+drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_enum_path_resources_ack_reply *path_res;
+ struct drm_dp_sideband_msg_tx *txmsg;
+ int ret;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg)
+ return -ENOMEM;
+
+ txmsg->dst = mstb;
+ build_enum_path_resources(txmsg, port->port_num);
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0) {
+ ret = 0;
+ path_res = &txmsg->reply.u.path_resources;
+
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ drm_dbg_kms(mgr->dev, "enum path resources nak received\n");
+ } else {
+ if (port->port_num != path_res->port_number)
+ DRM_ERROR("got incorrect port in response\n");
+
+ drm_dbg_kms(mgr->dev, "enum path resources %d: %d %d\n",
+ path_res->port_number,
+ path_res->full_payload_bw_number,
+ path_res->avail_payload_bw_number);
+
+ /*
+ * If something changed, make sure we send a
+ * hotplug
+ */
+ if (port->full_pbn != path_res->full_payload_bw_number ||
+ port->fec_capable != path_res->fec_capable)
+ ret = 1;
+
+ port->full_pbn = path_res->full_payload_bw_number;
+ port->fec_capable = path_res->fec_capable;
+ }
+ }
+
+ kfree(txmsg);
+ return ret;
+}
+
+static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
+{
+ if (!mstb->port_parent)
+ return NULL;
+
+ if (mstb->port_parent->mstb != mstb)
+ return mstb->port_parent;
+
+ return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
+}
+
+/*
+ * Searches upwards in the topology starting from mstb to try to find the
+ * closest available parent of mstb that's still connected to the rest of the
+ * topology. This can be used in order to perform operations like releasing
+ * payloads, where the branch device which owned the payload may no longer be
+ * around and thus would require that the payload on the last living relative
+ * be freed instead.
+ */
+static struct drm_dp_mst_branch *
+drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb,
+ int *port_num)
+{
+ struct drm_dp_mst_branch *rmstb = NULL;
+ struct drm_dp_mst_port *found_port;
+
+ mutex_lock(&mgr->lock);
+ if (!mgr->mst_primary)
+ goto out;
+
+ do {
+ found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
+ if (!found_port)
+ break;
+
+ if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) {
+ rmstb = found_port->parent;
+ *port_num = found_port->port_num;
+ } else {
+ /* Search again, starting from this parent */
+ mstb = found_port->parent;
+ }
+ } while (!rmstb);
+out:
+ mutex_unlock(&mgr->lock);
+ return rmstb;
+}
+
+static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ int id,
+ int pbn)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ struct drm_dp_mst_branch *mstb;
+ int ret, port_num;
+ u8 sinks[DRM_DP_MAX_SDP_STREAMS];
+ int i;
+
+ port_num = port->port_num;
+ mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
+ if (!mstb) {
+ mstb = drm_dp_get_last_connected_port_and_mstb(mgr,
+ port->parent,
+ &port_num);
+
+ if (!mstb)
+ return -EINVAL;
+ }
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ ret = -ENOMEM;
+ goto fail_put;
+ }
+
+ for (i = 0; i < port->num_sdp_streams; i++)
+ sinks[i] = i;
+
+ txmsg->dst = mstb;
+ build_allocate_payload(txmsg, port_num,
+ id,
+ pbn, port->num_sdp_streams, sinks);
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ /*
+ * FIXME: there is a small chance that between getting the last
+ * connected mstb and sending the payload message, the last connected
+ * mstb could also be removed from the topology. In the future, this
+ * needs to be fixed by restarting the
+ * drm_dp_get_last_connected_port_and_mstb() search in the event of a
+ * timeout if the topology is still connected to the system.
+ */
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0) {
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ ret = -EINVAL;
+ else
+ ret = 0;
+ }
+ kfree(txmsg);
+fail_put:
+ drm_dp_mst_topology_put_mstb(mstb);
+ return ret;
+}
+
+int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port, bool power_up)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ int ret;
+
+ port = drm_dp_mst_topology_get_port_validated(mgr, port);
+ if (!port)
+ return -EINVAL;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ drm_dp_mst_topology_put_port(port);
+ return -ENOMEM;
+ }
+
+ txmsg->dst = port->parent;
+ build_power_updown_phy(txmsg, port->port_num, power_up);
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);
+ if (ret > 0) {
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ ret = -EINVAL;
+ else
+ ret = 0;
+ }
+ kfree(txmsg);
+ drm_dp_mst_topology_put_port(port);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
+
+int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ struct drm_dp_query_stream_enc_status_ack_reply *status)
+{
+ struct drm_dp_mst_topology_state *state;
+ struct drm_dp_mst_atomic_payload *payload;
+ struct drm_dp_sideband_msg_tx *txmsg;
+ u8 nonce[7];
+ int ret;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg)
+ return -ENOMEM;
+
+ port = drm_dp_mst_topology_get_port_validated(mgr, port);
+ if (!port) {
+ ret = -EINVAL;
+ goto out_get_port;
+ }
+
+ get_random_bytes(nonce, sizeof(nonce));
+
+ drm_modeset_lock(&mgr->base.lock, NULL);
+ state = to_drm_dp_mst_topology_state(mgr->base.state);
+ payload = drm_atomic_get_mst_payload_state(state, port);
+
+ /*
+ * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message
+ * transaction at the MST Branch device directly connected to the
+ * Source"
+ */
+ txmsg->dst = mgr->mst_primary;
+
+ build_query_stream_enc_status(txmsg, payload->vcpi, nonce);
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg);
+ if (ret < 0) {
+ goto out;
+ } else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ drm_dbg_kms(mgr->dev, "query encryption status nak received\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ ret = 0;
+ memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));
+
+out:
+ drm_modeset_unlock(&mgr->base.lock);
+ drm_dp_mst_topology_put_port(port);
+out_get_port:
+ kfree(txmsg);
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status);
+
+static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_atomic_payload *payload)
+{
+ return drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot,
+ payload->time_slots);
+}
+
+static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_atomic_payload *payload)
+{
+ int ret;
+ struct drm_dp_mst_port *port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
+
+ if (!port)
+ return -EIO;
+
+ ret = drm_dp_payload_send_msg(mgr, port, payload->vcpi, payload->pbn);
+ drm_dp_mst_topology_put_port(port);
+ return ret;
+}
+
+static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_topology_state *mst_state,
+ struct drm_dp_mst_atomic_payload *payload)
+{
+ drm_dbg_kms(mgr->dev, "\n");
+
+ /* it's okay for these to fail */
+ drm_dp_payload_send_msg(mgr, payload->port, payload->vcpi, 0);
+ drm_dp_dpcd_write_payload(mgr, payload->vcpi, payload->vc_start_slot, 0);
+
+ return 0;
+}
+
+/**
+ * drm_dp_add_payload_part1() - Execute payload update part 1
+ * @mgr: Manager to use.
+ * @mst_state: The MST atomic state
+ * @payload: The payload to write
+ *
+ * Determines the starting time slot for the given payload, and programs the VCPI for this payload
+ * into hardware. After calling this, the driver should generate ACT and payload packets.
+ *
+ * Returns: 0 on success, error code on failure. In the event that this fails,
+ * @payload.vc_start_slot will also be set to -1.
+ */
+int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_topology_state *mst_state,
+ struct drm_dp_mst_atomic_payload *payload)
+{
+ struct drm_dp_mst_port *port;
+ int ret;
+
+ port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
+ if (!port) {
+ drm_dbg_kms(mgr->dev,
+ "VCPI %d for port %p not in topology, not creating a payload\n",
+ payload->vcpi, payload->port);
+ payload->vc_start_slot = -1;
+ return 0;
+ }
+
+ if (mgr->payload_count == 0)
+ mgr->next_start_slot = mst_state->start_slot;
+
+ payload->vc_start_slot = mgr->next_start_slot;
+
+ ret = drm_dp_create_payload_step1(mgr, payload);
+ drm_dp_mst_topology_put_port(port);
+ if (ret < 0) {
+ drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n",
+ payload->port, ret);
+ payload->vc_start_slot = -1;
+ return ret;
+ }
+
+ mgr->payload_count++;
+ mgr->next_start_slot += payload->time_slots;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_add_payload_part1);
+
+/**
+ * drm_dp_remove_payload() - Remove an MST payload
+ * @mgr: Manager to use.
+ * @mst_state: The MST atomic state
+ * @old_payload: The payload with its old state
+ * @new_payload: The payload to write
+ *
+ * Removes a payload from an MST topology if it was successfully assigned a start slot. Also updates
+ * the starting time slots of all other payloads which would have been shifted towards the start of
+ * the VC table as a result. After calling this, the driver should generate ACT and payload packets.
+ */
+void drm_dp_remove_payload(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_topology_state *mst_state,
+ const struct drm_dp_mst_atomic_payload *old_payload,
+ struct drm_dp_mst_atomic_payload *new_payload)
+{
+ struct drm_dp_mst_atomic_payload *pos;
+ bool send_remove = false;
+
+ /* We failed to make the payload, so nothing to do */
+ if (new_payload->vc_start_slot == -1)
+ return;
+
+ mutex_lock(&mgr->lock);
+ send_remove = drm_dp_mst_port_downstream_of_branch(new_payload->port, mgr->mst_primary);
+ mutex_unlock(&mgr->lock);
+
+ if (send_remove)
+ drm_dp_destroy_payload_step1(mgr, mst_state, new_payload);
+ else
+ drm_dbg_kms(mgr->dev, "Payload for VCPI %d not in topology, not sending remove\n",
+ new_payload->vcpi);
+
+ list_for_each_entry(pos, &mst_state->payloads, next) {
+ if (pos != new_payload && pos->vc_start_slot > new_payload->vc_start_slot)
+ pos->vc_start_slot -= old_payload->time_slots;
+ }
+ new_payload->vc_start_slot = -1;
+
+ mgr->payload_count--;
+ mgr->next_start_slot -= old_payload->time_slots;
+
+ if (new_payload->delete)
+ drm_dp_mst_put_port_malloc(new_payload->port);
+}
+EXPORT_SYMBOL(drm_dp_remove_payload);
+
+/**
+ * drm_dp_add_payload_part2() - Execute payload update part 2
+ * @mgr: Manager to use.
+ * @state: The global atomic state
+ * @payload: The payload to update
+ *
+ * If @payload was successfully assigned a starting time slot by drm_dp_add_payload_part1(), this
+ * function will send the sideband messages to finish allocating this payload.
+ *
+ * Returns: 0 on success, negative error code on failure.
+ */
+int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_atomic_state *state,
+ struct drm_dp_mst_atomic_payload *payload)
+{
+ int ret = 0;
+
+ /* Skip failed payloads */
+ if (payload->vc_start_slot == -1) {
+ drm_dbg_kms(mgr->dev, "Part 1 of payload creation for %s failed, skipping part 2\n",
+ payload->port->connector->name);
+ return -EIO;
+ }
+
+ ret = drm_dp_create_payload_step2(mgr, payload);
+ if (ret < 0) {
+ if (!payload->delete)
+ drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",
+ payload->port, ret);
+ else
+ drm_dbg_kms(mgr->dev, "Step 2 of removing MST payload for %p failed: %d\n",
+ payload->port, ret);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_add_payload_part2);
+
+static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ int offset, int size, u8 *bytes)
+{
+ int ret = 0;
+ struct drm_dp_sideband_msg_tx *txmsg;
+ struct drm_dp_mst_branch *mstb;
+
+ mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
+ if (!mstb)
+ return -EINVAL;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ ret = -ENOMEM;
+ goto fail_put;
+ }
+
+ build_dpcd_read(txmsg, port->port_num, offset, size);
+ txmsg->dst = port->parent;
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret < 0)
+ goto fail_free;
+
+ if (txmsg->reply.reply_type == 1) {
+ drm_dbg_kms(mgr->dev, "mstb %p port %d: DPCD read on addr 0x%x for %d bytes NAKed\n",
+ mstb, port->port_num, offset, size);
+ ret = -EIO;
+ goto fail_free;
+ }
+
+ if (txmsg->reply.u.remote_dpcd_read_ack.num_bytes != size) {
+ ret = -EPROTO;
+ goto fail_free;
+ }
+
+ ret = min_t(size_t, txmsg->reply.u.remote_dpcd_read_ack.num_bytes,
+ size);
+ memcpy(bytes, txmsg->reply.u.remote_dpcd_read_ack.bytes, ret);
+
+fail_free:
+ kfree(txmsg);
+fail_put:
+ drm_dp_mst_topology_put_mstb(mstb);
+
+ return ret;
+}
+
+static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port,
+ int offset, int size, u8 *bytes)
+{
+ int ret;
+ struct drm_dp_sideband_msg_tx *txmsg;
+ struct drm_dp_mst_branch *mstb;
+
+ mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
+ if (!mstb)
+ return -EINVAL;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ ret = -ENOMEM;
+ goto fail_put;
+ }
+
+ build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
+ txmsg->dst = mstb;
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0) {
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
+ ret = -EIO;
+ else
+ ret = size;
+ }
+
+ kfree(txmsg);
+fail_put:
+ drm_dp_mst_topology_put_mstb(mstb);
+ return ret;
+}
+
+static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
+{
+ struct drm_dp_sideband_msg_reply_body reply;
+
+ reply.reply_type = DP_SIDEBAND_REPLY_ACK;
+ reply.req_type = req_type;
+ drm_dp_encode_sideband_reply(&reply, msg);
+ return 0;
+}
+
+static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_branch *mstb,
+ int req_type, bool broadcast)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg)
+ return -ENOMEM;
+
+ txmsg->dst = mstb;
+ drm_dp_encode_up_ack_reply(txmsg, req_type);
+
+ mutex_lock(&mgr->qlock);
+ /* construct a chunk from the first msg in the tx_msg queue */
+ process_single_tx_qlock(mgr, txmsg, true);
+ mutex_unlock(&mgr->qlock);
+
+ kfree(txmsg);
+ return 0;
+}
+
+/**
+ * drm_dp_get_vc_payload_bw - get the VC payload BW for an MST link
+ * @mgr: The &drm_dp_mst_topology_mgr to use
+ * @link_rate: link rate in 10kbits/s units
+ * @link_lane_count: lane count
+ *
+ * Calculate the total bandwidth of a MultiStream Transport link. The returned
+ * value is in units of PBNs/(timeslots/1 MTP). This value can be used to
+ * convert the number of PBNs required for a given stream to the number of
+ * timeslots this stream requires in each MTP.
+ */
+int drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr,
+ int link_rate, int link_lane_count)
+{
+ if (link_rate == 0 || link_lane_count == 0)
+ drm_dbg_kms(mgr->dev, "invalid link rate/lane count: (%d / %d)\n",
+ link_rate, link_lane_count);
+
+ /* See DP v2.0 2.6.4.2, VCPayload_Bandwidth_for_OneTimeSlotPer_MTP_Allocation */
+ return link_rate * link_lane_count / 54000;
+}
+EXPORT_SYMBOL(drm_dp_get_vc_payload_bw);
+
+/**
+ * drm_dp_read_mst_cap() - check whether or not a sink supports MST
+ * @aux: The DP AUX channel to use
+ * @dpcd: A cached copy of the DPCD capabilities for this sink
+ *
+ * Returns: %True if the sink supports MST, %false otherwise
+ */
+bool drm_dp_read_mst_cap(struct drm_dp_aux *aux,
+ const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ u8 mstm_cap;
+
+ if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12)
+ return false;
+
+ if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1)
+ return false;
+
+ return mstm_cap & DP_MST_CAP;
+}
+EXPORT_SYMBOL(drm_dp_read_mst_cap);
+
+/**
+ * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
+ * @mgr: manager to set state for
+ * @mst_state: true to enable MST on this connector - false to disable.
+ *
+ * This is called by the driver when it detects an MST capable device plugged
+ * into a DP MST capable port, or when a DP MST capable device is unplugged.
+ */
+int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
+{
+ int ret = 0;
+ struct drm_dp_mst_branch *mstb = NULL;
+
+ mutex_lock(&mgr->lock);
+ if (mst_state == mgr->mst_state)
+ goto out_unlock;
+
+ mgr->mst_state = mst_state;
+ /* set the device into MST mode */
+ if (mst_state) {
+ WARN_ON(mgr->mst_primary);
+
+ /* get dpcd info */
+ ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
+ if (ret < 0) {
+ drm_dbg_kms(mgr->dev, "%s: failed to read DPCD, ret %d\n",
+ mgr->aux->name, ret);
+ goto out_unlock;
+ }
+
+ /* add initial branch device at LCT 1 */
+ mstb = drm_dp_add_mst_branch_device(1, NULL);
+ if (mstb == NULL) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+ mstb->mgr = mgr;
+
+ /* give this the main reference */
+ mgr->mst_primary = mstb;
+ drm_dp_mst_topology_get_mstb(mgr->mst_primary);
+
+ ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
+ DP_MST_EN |
+ DP_UP_REQ_EN |
+ DP_UPSTREAM_IS_SRC);
+ if (ret < 0)
+ goto out_unlock;
+
+ /* Write reset payload */
+ drm_dp_dpcd_write_payload(mgr, 0, 0, 0x3f);
+
+ queue_work(system_long_wq, &mgr->work);
+
+ ret = 0;
+ } else {
+ /* disable MST on the device */
+ mstb = mgr->mst_primary;
+ mgr->mst_primary = NULL;
+ /* this can fail if the device is gone */
+ drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
+ ret = 0;
+ mgr->payload_id_table_cleared = false;
+
+ memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv));
+ memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv));
+ }
+
+out_unlock:
+ mutex_unlock(&mgr->lock);
+ if (mstb)
+ drm_dp_mst_topology_put_mstb(mstb);
+ return ret;
+
+}
+EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
+
+static void
+drm_dp_mst_topology_mgr_invalidate_mstb(struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_mst_port *port;
+
+ /* The link address will need to be re-sent on resume */
+ mstb->link_address_sent = false;
+
+ list_for_each_entry(port, &mstb->ports, next)
+ if (port->mstb)
+ drm_dp_mst_topology_mgr_invalidate_mstb(port->mstb);
+}
+
+/**
+ * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
+ * @mgr: manager to suspend
+ *
+ * This function tells the MST device that we can't handle UP messages
+ * anymore. This should stop it from sending any since we are suspended.
+ */
+void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
+{
+ mutex_lock(&mgr->lock);
+ drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
+ DP_MST_EN | DP_UPSTREAM_IS_SRC);
+ mutex_unlock(&mgr->lock);
+ flush_work(&mgr->up_req_work);
+ flush_work(&mgr->work);
+ flush_work(&mgr->delayed_destroy_work);
+
+ mutex_lock(&mgr->lock);
+ if (mgr->mst_state && mgr->mst_primary)
+ drm_dp_mst_topology_mgr_invalidate_mstb(mgr->mst_primary);
+ mutex_unlock(&mgr->lock);
+}
+EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
+
+/**
+ * drm_dp_mst_topology_mgr_resume() - resume the MST manager
+ * @mgr: manager to resume
+ * @sync: whether or not to perform topology reprobing synchronously
+ *
+ * This will fetch DPCD and see if the device is still there,
+ * if it is, it will rewrite the MSTM control bits, and return.
+ *
+ * If the device fails this returns -1, and the driver should do
+ * a full MST reprobe, in case we were undocked.
+ *
+ * During system resume (where it is assumed that the driver will be calling
+ * drm_atomic_helper_resume()) this function should be called beforehand with
+ * @sync set to true. In contexts like runtime resume where the driver is not
+ * expected to be calling drm_atomic_helper_resume(), this function should be
+ * called with @sync set to false in order to avoid deadlocking.
+ *
+ * Returns: -1 if the MST topology was removed while we were suspended, 0
+ * otherwise.
+ */
+int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
+ bool sync)
+{
+ int ret;
+ u8 guid[16];
+
+ mutex_lock(&mgr->lock);
+ if (!mgr->mst_primary)
+ goto out_fail;
+
+ if (drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd) < 0) {
+ drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");
+ goto out_fail;
+ }
+
+ ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
+ DP_MST_EN |
+ DP_UP_REQ_EN |
+ DP_UPSTREAM_IS_SRC);
+ if (ret < 0) {
+ drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n");
+ goto out_fail;
+ }
+
+ /* Some hubs forget their guids after they resume */
+ ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
+ if (ret != 16) {
+ drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");
+ goto out_fail;
+ }
+
+ ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid);
+ if (ret) {
+ drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n");
+ goto out_fail;
+ }
+
+ /*
+ * For the final step of resuming the topology, we need to bring the
+ * state of our in-memory topology back into sync with reality. So,
+ * restart the probing process as if we're probing a new hub
+ */
+ queue_work(system_long_wq, &mgr->work);
+ mutex_unlock(&mgr->lock);
+
+ if (sync) {
+ drm_dbg_kms(mgr->dev,
+ "Waiting for link probe work to finish re-syncing topology...\n");
+ flush_work(&mgr->work);
+ }
+
+ return 0;
+
+out_fail:
+ mutex_unlock(&mgr->lock);
+ return -1;
+}
+EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
+
+static bool
+drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up,
+ struct drm_dp_mst_branch **mstb)
+{
+ int len;
+ u8 replyblock[32];
+ int replylen, curreply;
+ int ret;
+ u8 hdrlen;
+ struct drm_dp_sideband_msg_hdr hdr;
+ struct drm_dp_sideband_msg_rx *msg =
+ up ? &mgr->up_req_recv : &mgr->down_rep_recv;
+ int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE :
+ DP_SIDEBAND_MSG_DOWN_REP_BASE;
+
+ if (!up)
+ *mstb = NULL;
+
+ len = min(mgr->max_dpcd_transaction_bytes, 16);
+ ret = drm_dp_dpcd_read(mgr->aux, basereg, replyblock, len);
+ if (ret != len) {
+ drm_dbg_kms(mgr->dev, "failed to read DPCD down rep %d %d\n", len, ret);
+ return false;
+ }
+
+ ret = drm_dp_decode_sideband_msg_hdr(mgr, &hdr, replyblock, len, &hdrlen);
+ if (ret == false) {
+ print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16,
+ 1, replyblock, len, false);
+ drm_dbg_kms(mgr->dev, "ERROR: failed header\n");
+ return false;
+ }
+
+ if (!up) {
+ /* Caller is responsible for giving back this reference */
+ *mstb = drm_dp_get_mst_branch_device(mgr, hdr.lct, hdr.rad);
+ if (!*mstb) {
+ drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr.lct);
+ return false;
+ }
+ }
+
+ if (!drm_dp_sideband_msg_set_header(msg, &hdr, hdrlen)) {
+ drm_dbg_kms(mgr->dev, "sideband msg set header failed %d\n", replyblock[0]);
+ return false;
+ }
+
+ replylen = min(msg->curchunk_len, (u8)(len - hdrlen));
+ ret = drm_dp_sideband_append_payload(msg, replyblock + hdrlen, replylen);
+ if (!ret) {
+ drm_dbg_kms(mgr->dev, "sideband msg build failed %d\n", replyblock[0]);
+ return false;
+ }
+
+ replylen = msg->curchunk_len + msg->curchunk_hdrlen - len;
+ curreply = len;
+ while (replylen > 0) {
+ len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
+ ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
+ replyblock, len);
+ if (ret != len) {
+ drm_dbg_kms(mgr->dev, "failed to read a chunk (len %d, ret %d)\n",
+ len, ret);
+ return false;
+ }
+
+ ret = drm_dp_sideband_append_payload(msg, replyblock, len);
+ if (!ret) {
+ drm_dbg_kms(mgr->dev, "failed to build sideband msg\n");
+ return false;
+ }
+
+ curreply += len;
+ replylen -= len;
+ }
+ return true;
+}
+
+static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ struct drm_dp_mst_branch *mstb = NULL;
+ struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv;
+
+ if (!drm_dp_get_one_sb_msg(mgr, false, &mstb))
+ goto out_clear_reply;
+
+ /* Multi-packet message transmission, don't clear the reply */
+ if (!msg->have_eomt)
+ goto out;
+
+ /* find the message */
+ mutex_lock(&mgr->qlock);
+ txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,
+ struct drm_dp_sideband_msg_tx, next);
+ mutex_unlock(&mgr->qlock);
+
+ /* Were we actually expecting a response, and from this mstb? */
+ if (!txmsg || txmsg->dst != mstb) {
+ struct drm_dp_sideband_msg_hdr *hdr;
+
+ hdr = &msg->initial_hdr;
+ drm_dbg_kms(mgr->dev, "Got MST reply with no msg %p %d %d %02x %02x\n",
+ mstb, hdr->seqno, hdr->lct, hdr->rad[0], msg->msg[0]);
+ goto out_clear_reply;
+ }
+
+ drm_dp_sideband_parse_reply(mgr, msg, &txmsg->reply);
+
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ drm_dbg_kms(mgr->dev,
+ "Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n",
+ txmsg->reply.req_type,
+ drm_dp_mst_req_type_str(txmsg->reply.req_type),
+ txmsg->reply.u.nak.reason,
+ drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),
+ txmsg->reply.u.nak.nak_data);
+ }
+
+ memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
+ drm_dp_mst_topology_put_mstb(mstb);
+
+ mutex_lock(&mgr->qlock);
+ txmsg->state = DRM_DP_SIDEBAND_TX_RX;
+ list_del(&txmsg->next);
+ mutex_unlock(&mgr->qlock);
+
+ wake_up_all(&mgr->tx_waitq);
+
+ return 0;
+
+out_clear_reply:
+ memset(msg, 0, sizeof(struct drm_dp_sideband_msg_rx));
+out:
+ if (mstb)
+ drm_dp_mst_topology_put_mstb(mstb);
+
+ return 0;
+}
+
+static inline bool
+drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_pending_up_req *up_req)
+{
+ struct drm_dp_mst_branch *mstb = NULL;
+ struct drm_dp_sideband_msg_req_body *msg = &up_req->msg;
+ struct drm_dp_sideband_msg_hdr *hdr = &up_req->hdr;
+ bool hotplug = false, dowork = false;
+
+ if (hdr->broadcast) {
+ const u8 *guid = NULL;
+
+ if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY)
+ guid = msg->u.conn_stat.guid;
+ else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)
+ guid = msg->u.resource_stat.guid;
+
+ if (guid)
+ mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid);
+ } else {
+ mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad);
+ }
+
+ if (!mstb) {
+ drm_dbg_kms(mgr->dev, "Got MST reply from unknown device %d\n", hdr->lct);
+ return false;
+ }
+
+ /* TODO: Add missing handler for DP_RESOURCE_STATUS_NOTIFY events */
+ if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY) {
+ dowork = drm_dp_mst_handle_conn_stat(mstb, &msg->u.conn_stat);
+ hotplug = true;
+ }
+
+ drm_dp_mst_topology_put_mstb(mstb);
+
+ if (dowork)
+ queue_work(system_long_wq, &mgr->work);
+ return hotplug;
+}
+
+static void drm_dp_mst_up_req_work(struct work_struct *work)
+{
+ struct drm_dp_mst_topology_mgr *mgr =
+ container_of(work, struct drm_dp_mst_topology_mgr,
+ up_req_work);
+ struct drm_dp_pending_up_req *up_req;
+ bool send_hotplug = false;
+
+ mutex_lock(&mgr->probe_lock);
+ while (true) {
+ mutex_lock(&mgr->up_req_lock);
+ up_req = list_first_entry_or_null(&mgr->up_req_list,
+ struct drm_dp_pending_up_req,
+ next);
+ if (up_req)
+ list_del(&up_req->next);
+ mutex_unlock(&mgr->up_req_lock);
+
+ if (!up_req)
+ break;
+
+ send_hotplug |= drm_dp_mst_process_up_req(mgr, up_req);
+ kfree(up_req);
+ }
+ mutex_unlock(&mgr->probe_lock);
+
+ if (send_hotplug)
+ drm_kms_helper_hotplug_event(mgr->dev);
+}
+
+static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_pending_up_req *up_req;
+
+ if (!drm_dp_get_one_sb_msg(mgr, true, NULL))
+ goto out;
+
+ if (!mgr->up_req_recv.have_eomt)
+ return 0;
+
+ up_req = kzalloc(sizeof(*up_req), GFP_KERNEL);
+ if (!up_req)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&up_req->next);
+
+ drm_dp_sideband_parse_req(mgr, &mgr->up_req_recv, &up_req->msg);
+
+ if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&
+ up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) {
+ drm_dbg_kms(mgr->dev, "Received unknown up req type, ignoring: %x\n",
+ up_req->msg.req_type);
+ kfree(up_req);
+ goto out;
+ }
+
+ drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, up_req->msg.req_type,
+ false);
+
+ if (up_req->msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
+ const struct drm_dp_connection_status_notify *conn_stat =
+ &up_req->msg.u.conn_stat;
+
+ drm_dbg_kms(mgr->dev, "Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n",
+ conn_stat->port_number,
+ conn_stat->legacy_device_plug_status,
+ conn_stat->displayport_device_plug_status,
+ conn_stat->message_capability_status,
+ conn_stat->input_port,
+ conn_stat->peer_device_type);
+ } else if (up_req->msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
+ const struct drm_dp_resource_status_notify *res_stat =
+ &up_req->msg.u.resource_stat;
+
+ drm_dbg_kms(mgr->dev, "Got RSN: pn: %d avail_pbn %d\n",
+ res_stat->port_number,
+ res_stat->available_pbn);
+ }
+
+ up_req->hdr = mgr->up_req_recv.initial_hdr;
+ mutex_lock(&mgr->up_req_lock);
+ list_add_tail(&up_req->next, &mgr->up_req_list);
+ mutex_unlock(&mgr->up_req_lock);
+ queue_work(system_long_wq, &mgr->up_req_work);
+
+out:
+ memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
+ return 0;
+}
+
+/**
+ * drm_dp_mst_hpd_irq_handle_event() - MST hotplug IRQ handle MST event
+ * @mgr: manager to notify irq for.
+ * @esi: 4 bytes from SINK_COUNT_ESI
+ * @ack: 4 bytes used to ack events starting from SINK_COUNT_ESI
+ * @handled: whether the hpd interrupt was consumed or not
+ *
+ * This should be called from the driver when it detects a HPD IRQ,
+ * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
+ * topology manager will process the sideband messages received
+ * as indicated in the DEVICE_SERVICE_IRQ_VECTOR_ESI0 and set the
+ * corresponding flags that Driver has to ack the DP receiver later.
+ *
+ * Note that driver shall also call
+ * drm_dp_mst_hpd_irq_send_new_request() if the 'handled' is set
+ * after calling this function, to try to kick off a new request in
+ * the queue if the previous message transaction is completed.
+ *
+ * See also:
+ * drm_dp_mst_hpd_irq_send_new_request()
+ */
+int drm_dp_mst_hpd_irq_handle_event(struct drm_dp_mst_topology_mgr *mgr, const u8 *esi,
+ u8 *ack, bool *handled)
+{
+ int ret = 0;
+ int sc;
+ *handled = false;
+ sc = DP_GET_SINK_COUNT(esi[0]);
+
+ if (sc != mgr->sink_count) {
+ mgr->sink_count = sc;
+ *handled = true;
+ }
+
+ if (esi[1] & DP_DOWN_REP_MSG_RDY) {
+ ret = drm_dp_mst_handle_down_rep(mgr);
+ *handled = true;
+ ack[1] |= DP_DOWN_REP_MSG_RDY;
+ }
+
+ if (esi[1] & DP_UP_REQ_MSG_RDY) {
+ ret |= drm_dp_mst_handle_up_req(mgr);
+ *handled = true;
+ ack[1] |= DP_UP_REQ_MSG_RDY;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_mst_hpd_irq_handle_event);
+
+/**
+ * drm_dp_mst_hpd_irq_send_new_request() - MST hotplug IRQ kick off new request
+ * @mgr: manager to notify irq for.
+ *
+ * This should be called from the driver when mst irq event is handled
+ * and acked. Note that new down request should only be sent when
+ * previous message transaction is completed. Source is not supposed to generate
+ * interleaved message transactions.
+ */
+void drm_dp_mst_hpd_irq_send_new_request(struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_sideband_msg_tx *txmsg;
+ bool kick = true;
+
+ mutex_lock(&mgr->qlock);
+ txmsg = list_first_entry_or_null(&mgr->tx_msg_downq,
+ struct drm_dp_sideband_msg_tx, next);
+ /* If last transaction is not completed yet*/
+ if (!txmsg ||
+ txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
+ txmsg->state == DRM_DP_SIDEBAND_TX_SENT)
+ kick = false;
+ mutex_unlock(&mgr->qlock);
+
+ if (kick)
+ drm_dp_mst_kick_tx(mgr);
+}
+EXPORT_SYMBOL(drm_dp_mst_hpd_irq_send_new_request);
+/**
+ * drm_dp_mst_detect_port() - get connection status for an MST port
+ * @connector: DRM connector for this port
+ * @ctx: The acquisition context to use for grabbing locks
+ * @mgr: manager for this port
+ * @port: pointer to a port
+ *
+ * This returns the current connection state for a port.
+ */
+int
+drm_dp_mst_detect_port(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
+{
+ int ret;
+
+ /* we need to search for the port in the mgr in case it's gone */
+ port = drm_dp_mst_topology_get_port_validated(mgr, port);
+ if (!port)
+ return connector_status_disconnected;
+
+ ret = drm_modeset_lock(&mgr->base.lock, ctx);
+ if (ret)
+ goto out;
+
+ ret = connector_status_disconnected;
+
+ if (!port->ddps)
+ goto out;
+
+ switch (port->pdt) {
+ case DP_PEER_DEVICE_NONE:
+ break;
+ case DP_PEER_DEVICE_MST_BRANCHING:
+ if (!port->mcs)
+ ret = connector_status_connected;
+ break;
+
+ case DP_PEER_DEVICE_SST_SINK:
+ ret = connector_status_connected;
+ /* for logical ports - cache the EDID */
+ if (port->port_num >= DP_MST_LOGICAL_PORT_0 && !port->cached_edid)
+ port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
+ break;
+ case DP_PEER_DEVICE_DP_LEGACY_CONV:
+ if (port->ldps)
+ ret = connector_status_connected;
+ break;
+ }
+out:
+ drm_dp_mst_topology_put_port(port);
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_mst_detect_port);
+
+/**
+ * drm_dp_mst_get_edid() - get EDID for an MST port
+ * @connector: toplevel connector to get EDID for
+ * @mgr: manager for this port
+ * @port: unverified pointer to a port.
+ *
+ * This returns an EDID for the port connected to a connector,
+ * It validates the pointer still exists so the caller doesn't require a
+ * reference.
+ */
+struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
+{
+ struct edid *edid = NULL;
+
+ /* we need to search for the port in the mgr in case it's gone */
+ port = drm_dp_mst_topology_get_port_validated(mgr, port);
+ if (!port)
+ return NULL;
+
+ if (port->cached_edid)
+ edid = drm_edid_duplicate(port->cached_edid);
+ else {
+ edid = drm_get_edid(connector, &port->aux.ddc);
+ }
+ port->has_audio = drm_detect_monitor_audio(edid);
+ drm_dp_mst_topology_put_port(port);
+ return edid;
+}
+EXPORT_SYMBOL(drm_dp_mst_get_edid);
+
+/**
+ * drm_dp_atomic_find_time_slots() - Find and add time slots to the state
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: port to find time slots for
+ * @pbn: bandwidth required for the mode in PBN
+ *
+ * Allocates time slots to @port, replacing any previous time slot allocations it may
+ * have had. Any atomic drivers which support MST must call this function in
+ * their &drm_encoder_helper_funcs.atomic_check() callback unconditionally to
+ * change the current time slot allocation for the new state, and ensure the MST
+ * atomic state is added whenever the state of payloads in the topology changes.
+ *
+ * Allocations set by this function are not checked against the bandwidth
+ * restraints of @mgr until the driver calls drm_dp_mst_atomic_check().
+ *
+ * Additionally, it is OK to call this function multiple times on the same
+ * @port as needed. It is not OK however, to call this function and
+ * drm_dp_atomic_release_time_slots() in the same atomic check phase.
+ *
+ * See also:
+ * drm_dp_atomic_release_time_slots()
+ * drm_dp_mst_atomic_check()
+ *
+ * Returns:
+ * Total slots in the atomic state assigned for this port, or a negative error
+ * code if the port no longer exists
+ */
+int drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port, int pbn)
+{
+ struct drm_dp_mst_topology_state *topology_state;
+ struct drm_dp_mst_atomic_payload *payload = NULL;
+ struct drm_connector_state *conn_state;
+ int prev_slots = 0, prev_bw = 0, req_slots;
+
+ topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+ if (IS_ERR(topology_state))
+ return PTR_ERR(topology_state);
+
+ conn_state = drm_atomic_get_new_connector_state(state, port->connector);
+ topology_state->pending_crtc_mask |= drm_crtc_mask(conn_state->crtc);
+
+ /* Find the current allocation for this port, if any */
+ payload = drm_atomic_get_mst_payload_state(topology_state, port);
+ if (payload) {
+ prev_slots = payload->time_slots;
+ prev_bw = payload->pbn;
+
+ /*
+ * This should never happen, unless the driver tries
+ * releasing and allocating the same timeslot allocation,
+ * which is an error
+ */
+ if (drm_WARN_ON(mgr->dev, payload->delete)) {
+ drm_err(mgr->dev,
+ "cannot allocate and release time slots on [MST PORT:%p] in the same state\n",
+ port);
+ return -EINVAL;
+ }
+ }
+
+ req_slots = DIV_ROUND_UP(pbn, topology_state->pbn_div);
+
+ drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] TU %d -> %d\n",
+ port->connector->base.id, port->connector->name,
+ port, prev_slots, req_slots);
+ drm_dbg_atomic(mgr->dev, "[CONNECTOR:%d:%s] [MST PORT:%p] PBN %d -> %d\n",
+ port->connector->base.id, port->connector->name,
+ port, prev_bw, pbn);
+
+ /* Add the new allocation to the state, note the VCPI isn't assigned until the end */
+ if (!payload) {
+ payload = kzalloc(sizeof(*payload), GFP_KERNEL);
+ if (!payload)
+ return -ENOMEM;
+
+ drm_dp_mst_get_port_malloc(port);
+ payload->port = port;
+ payload->vc_start_slot = -1;
+ list_add(&payload->next, &topology_state->payloads);
+ }
+ payload->time_slots = req_slots;
+ payload->pbn = pbn;
+
+ return req_slots;
+}
+EXPORT_SYMBOL(drm_dp_atomic_find_time_slots);
+
+/**
+ * drm_dp_atomic_release_time_slots() - Release allocated time slots
+ * @state: global atomic state
+ * @mgr: MST topology manager for the port
+ * @port: The port to release the time slots from
+ *
+ * Releases any time slots that have been allocated to a port in the atomic
+ * state. Any atomic drivers which support MST must call this function
+ * unconditionally in their &drm_connector_helper_funcs.atomic_check() callback.
+ * This helper will check whether time slots would be released by the new state and
+ * respond accordingly, along with ensuring the MST state is always added to the
+ * atomic state whenever a new state would modify the state of payloads on the
+ * topology.
+ *
+ * It is OK to call this even if @port has been removed from the system.
+ * Additionally, it is OK to call this function multiple times on the same
+ * @port as needed. It is not OK however, to call this function and
+ * drm_dp_atomic_find_time_slots() on the same @port in a single atomic check
+ * phase.
+ *
+ * See also:
+ * drm_dp_atomic_find_time_slots()
+ * drm_dp_mst_atomic_check()
+ *
+ * Returns:
+ * 0 on success, negative error code otherwise
+ */
+int drm_dp_atomic_release_time_slots(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_topology_state *topology_state;
+ struct drm_dp_mst_atomic_payload *payload;
+ struct drm_connector_state *old_conn_state, *new_conn_state;
+ bool update_payload = true;
+
+ old_conn_state = drm_atomic_get_old_connector_state(state, port->connector);
+ if (!old_conn_state->crtc)
+ return 0;
+
+ /* If the CRTC isn't disabled by this state, don't release it's payload */
+ new_conn_state = drm_atomic_get_new_connector_state(state, port->connector);
+ if (new_conn_state->crtc) {
+ struct drm_crtc_state *crtc_state =
+ drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
+
+ /* No modeset means no payload changes, so it's safe to not pull in the MST state */
+ if (!crtc_state || !drm_atomic_crtc_needs_modeset(crtc_state))
+ return 0;
+
+ if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
+ update_payload = false;
+ }
+
+ topology_state = drm_atomic_get_mst_topology_state(state, mgr);
+ if (IS_ERR(topology_state))
+ return PTR_ERR(topology_state);
+
+ topology_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc);
+ if (!update_payload)
+ return 0;
+
+ payload = drm_atomic_get_mst_payload_state(topology_state, port);
+ if (WARN_ON(!payload)) {
+ drm_err(mgr->dev, "No payload for [MST PORT:%p] found in mst state %p\n",
+ port, &topology_state->base);
+ return -EINVAL;
+ }
+
+ if (new_conn_state->crtc)
+ return 0;
+
+ drm_dbg_atomic(mgr->dev, "[MST PORT:%p] TU %d -> 0\n", port, payload->time_slots);
+ if (!payload->delete) {
+ payload->pbn = 0;
+ payload->delete = true;
+ topology_state->payload_mask &= ~BIT(payload->vcpi - 1);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_atomic_release_time_slots);
+
+/**
+ * drm_dp_mst_atomic_setup_commit() - setup_commit hook for MST helpers
+ * @state: global atomic state
+ *
+ * This function saves all of the &drm_crtc_commit structs in an atomic state that touch any CRTCs
+ * currently assigned to an MST topology. Drivers must call this hook from their
+ * &drm_mode_config_helper_funcs.atomic_commit_setup hook.
+ *
+ * Returns:
+ * 0 if all CRTC commits were retrieved successfully, negative error code otherwise
+ */
+int drm_dp_mst_atomic_setup_commit(struct drm_atomic_state *state)
+{
+ struct drm_dp_mst_topology_mgr *mgr;
+ struct drm_dp_mst_topology_state *mst_state;
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+ int i, j, commit_idx, num_commit_deps;
+
+ for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
+ if (!mst_state->pending_crtc_mask)
+ continue;
+
+ num_commit_deps = hweight32(mst_state->pending_crtc_mask);
+ mst_state->commit_deps = kmalloc_array(num_commit_deps,
+ sizeof(*mst_state->commit_deps), GFP_KERNEL);
+ if (!mst_state->commit_deps)
+ return -ENOMEM;
+ mst_state->num_commit_deps = num_commit_deps;
+
+ commit_idx = 0;
+ for_each_new_crtc_in_state(state, crtc, crtc_state, j) {
+ if (mst_state->pending_crtc_mask & drm_crtc_mask(crtc)) {
+ mst_state->commit_deps[commit_idx++] =
+ drm_crtc_commit_get(crtc_state->commit);
+ }
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_mst_atomic_setup_commit);
+
+/**
+ * drm_dp_mst_atomic_wait_for_dependencies() - Wait for all pending commits on MST topologies,
+ * prepare new MST state for commit
+ * @state: global atomic state
+ *
+ * Goes through any MST topologies in this atomic state, and waits for any pending commits which
+ * touched CRTCs that were/are on an MST topology to be programmed to hardware and flipped to before
+ * returning. This is to prevent multiple non-blocking commits affecting an MST topology from racing
+ * with eachother by forcing them to be executed sequentially in situations where the only resources
+ * the modeset objects in these commits share are an MST topology.
+ *
+ * This function also prepares the new MST state for commit by performing some state preparation
+ * which can't be done until this point, such as reading back the final VC start slots (which are
+ * determined at commit-time) from the previous state.
+ *
+ * All MST drivers must call this function after calling drm_atomic_helper_wait_for_dependencies(),
+ * or whatever their equivalent of that is.
+ */
+void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state)
+{
+ struct drm_dp_mst_topology_state *old_mst_state, *new_mst_state;
+ struct drm_dp_mst_topology_mgr *mgr;
+ struct drm_dp_mst_atomic_payload *old_payload, *new_payload;
+ int i, j, ret;
+
+ for_each_oldnew_mst_mgr_in_state(state, mgr, old_mst_state, new_mst_state, i) {
+ for (j = 0; j < old_mst_state->num_commit_deps; j++) {
+ ret = drm_crtc_commit_wait(old_mst_state->commit_deps[j]);
+ if (ret < 0)
+ drm_err(state->dev, "Failed to wait for %s: %d\n",
+ old_mst_state->commit_deps[j]->crtc->name, ret);
+ }
+
+ /* Now that previous state is committed, it's safe to copy over the start slot
+ * assignments
+ */
+ list_for_each_entry(old_payload, &old_mst_state->payloads, next) {
+ if (old_payload->delete)
+ continue;
+
+ new_payload = drm_atomic_get_mst_payload_state(new_mst_state,
+ old_payload->port);
+ new_payload->vc_start_slot = old_payload->vc_start_slot;
+ }
+ }
+}
+EXPORT_SYMBOL(drm_dp_mst_atomic_wait_for_dependencies);
+
+/**
+ * drm_dp_mst_root_conn_atomic_check() - Serialize CRTC commits on MST-capable connectors operating
+ * in SST mode
+ * @new_conn_state: The new connector state of the &drm_connector
+ * @mgr: The MST topology manager for the &drm_connector
+ *
+ * Since MST uses fake &drm_encoder structs, the generic atomic modesetting code isn't able to
+ * serialize non-blocking commits happening on the real DP connector of an MST topology switching
+ * into/away from MST mode - as the CRTC on the real DP connector and the CRTCs on the connector's
+ * MST topology will never share the same &drm_encoder.
+ *
+ * This function takes care of this serialization issue, by checking a root MST connector's atomic
+ * state to determine if it is about to have a modeset - and then pulling in the MST topology state
+ * if so, along with adding any relevant CRTCs to &drm_dp_mst_topology_state.pending_crtc_mask.
+ *
+ * Drivers implementing MST must call this function from the
+ * &drm_connector_helper_funcs.atomic_check hook of any physical DP &drm_connector capable of
+ * driving MST sinks.
+ *
+ * Returns:
+ * 0 on success, negative error code otherwise
+ */
+int drm_dp_mst_root_conn_atomic_check(struct drm_connector_state *new_conn_state,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_atomic_state *state = new_conn_state->state;
+ struct drm_connector_state *old_conn_state =
+ drm_atomic_get_old_connector_state(state, new_conn_state->connector);
+ struct drm_crtc_state *crtc_state;
+ struct drm_dp_mst_topology_state *mst_state = NULL;
+
+ if (new_conn_state->crtc) {
+ crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
+ if (crtc_state && drm_atomic_crtc_needs_modeset(crtc_state)) {
+ mst_state = drm_atomic_get_mst_topology_state(state, mgr);
+ if (IS_ERR(mst_state))
+ return PTR_ERR(mst_state);
+
+ mst_state->pending_crtc_mask |= drm_crtc_mask(new_conn_state->crtc);
+ }
+ }
+
+ if (old_conn_state->crtc) {
+ crtc_state = drm_atomic_get_new_crtc_state(state, old_conn_state->crtc);
+ if (crtc_state && drm_atomic_crtc_needs_modeset(crtc_state)) {
+ if (!mst_state) {
+ mst_state = drm_atomic_get_mst_topology_state(state, mgr);
+ if (IS_ERR(mst_state))
+ return PTR_ERR(mst_state);
+ }
+
+ mst_state->pending_crtc_mask |= drm_crtc_mask(old_conn_state->crtc);
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_mst_root_conn_atomic_check);
+
+/**
+ * drm_dp_mst_update_slots() - updates the slot info depending on the DP ecoding format
+ * @mst_state: mst_state to update
+ * @link_encoding_cap: the ecoding format on the link
+ */
+void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap)
+{
+ if (link_encoding_cap == DP_CAP_ANSI_128B132B) {
+ mst_state->total_avail_slots = 64;
+ mst_state->start_slot = 0;
+ } else {
+ mst_state->total_avail_slots = 63;
+ mst_state->start_slot = 1;
+ }
+
+ DRM_DEBUG_KMS("%s encoding format on mst_state 0x%p\n",
+ (link_encoding_cap == DP_CAP_ANSI_128B132B) ? "128b/132b":"8b/10b",
+ mst_state);
+}
+EXPORT_SYMBOL(drm_dp_mst_update_slots);
+
+static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
+ int id, u8 start_slot, u8 num_slots)
+{
+ u8 payload_alloc[3], status;
+ int ret;
+ int retries = 0;
+
+ drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
+ DP_PAYLOAD_TABLE_UPDATED);
+
+ payload_alloc[0] = id;
+ payload_alloc[1] = start_slot;
+ payload_alloc[2] = num_slots;
+
+ ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
+ if (ret != 3) {
+ drm_dbg_kms(mgr->dev, "failed to write payload allocation %d\n", ret);
+ goto fail;
+ }
+
+retry:
+ ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
+ if (ret < 0) {
+ drm_dbg_kms(mgr->dev, "failed to read payload table status %d\n", ret);
+ goto fail;
+ }
+
+ if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
+ retries++;
+ if (retries < 20) {
+ usleep_range(10000, 20000);
+ goto retry;
+ }
+ drm_dbg_kms(mgr->dev, "status not set after read payload table status %d\n",
+ status);
+ ret = -EINVAL;
+ goto fail;
+ }
+ ret = 0;
+fail:
+ return ret;
+}
+
+static int do_get_act_status(struct drm_dp_aux *aux)
+{
+ int ret;
+ u8 status;
+
+ ret = drm_dp_dpcd_readb(aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ return status;
+}
+
+/**
+ * drm_dp_check_act_status() - Polls for ACT handled status.
+ * @mgr: manager to use
+ *
+ * Tries waiting for the MST hub to finish updating it's payload table by
+ * polling for the ACT handled bit for up to 3 seconds (yes-some hubs really
+ * take that long).
+ *
+ * Returns:
+ * 0 if the ACT was handled in time, negative error code on failure.
+ */
+int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
+{
+ /*
+ * There doesn't seem to be any recommended retry count or timeout in
+ * the MST specification. Since some hubs have been observed to take
+ * over 1 second to update their payload allocations under certain
+ * conditions, we use a rather large timeout value.
+ */
+ const int timeout_ms = 3000;
+ int ret, status;
+
+ ret = readx_poll_timeout(do_get_act_status, mgr->aux, status,
+ status & DP_PAYLOAD_ACT_HANDLED || status < 0,
+ 200, timeout_ms * USEC_PER_MSEC);
+ if (ret < 0 && status >= 0) {
+ drm_err(mgr->dev, "Failed to get ACT after %dms, last status: %02x\n",
+ timeout_ms, status);
+ return -EINVAL;
+ } else if (status < 0) {
+ /*
+ * Failure here isn't unexpected - the hub may have
+ * just been unplugged
+ */
+ drm_dbg_kms(mgr->dev, "Failed to read payload table status: %d\n", status);
+ return status;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_check_act_status);
+
+/**
+ * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
+ * @clock: dot clock for the mode
+ * @bpp: bpp for the mode.
+ * @dsc: DSC mode. If true, bpp has units of 1/16 of a bit per pixel
+ *
+ * This uses the formula in the spec to calculate the PBN value for a mode.
+ */
+int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc)
+{
+ /*
+ * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
+ * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
+ * common multiplier to render an integer PBN for all link rate/lane
+ * counts combinations
+ * calculate
+ * peak_kbps *= (1006/1000)
+ * peak_kbps *= (64/54)
+ * peak_kbps *= 8 convert to bytes
+ *
+ * If the bpp is in units of 1/16, further divide by 16. Put this
+ * factor in the numerator rather than the denominator to avoid
+ * integer overflow
+ */
+
+ if (dsc)
+ return DIV_ROUND_UP_ULL(mul_u32_u32(clock * (bpp / 16), 64 * 1006),
+ 8 * 54 * 1000 * 1000);
+
+ return DIV_ROUND_UP_ULL(mul_u32_u32(clock * bpp, 64 * 1006),
+ 8 * 54 * 1000 * 1000);
+}
+EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
+
+/* we want to kick the TX after we've ack the up/down IRQs. */
+static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
+{
+ queue_work(system_long_wq, &mgr->tx_work);
+}
+
+/*
+ * Helper function for parsing DP device types into convenient strings
+ * for use with dp_mst_topology
+ */
+static const char *pdt_to_string(u8 pdt)
+{
+ switch (pdt) {
+ case DP_PEER_DEVICE_NONE:
+ return "NONE";
+ case DP_PEER_DEVICE_SOURCE_OR_SST:
+ return "SOURCE OR SST";
+ case DP_PEER_DEVICE_MST_BRANCHING:
+ return "MST BRANCHING";
+ case DP_PEER_DEVICE_SST_SINK:
+ return "SST SINK";
+ case DP_PEER_DEVICE_DP_LEGACY_CONV:
+ return "DP LEGACY CONV";
+ default:
+ return "ERR";
+ }
+}
+
+static void drm_dp_mst_dump_mstb(struct seq_file *m,
+ struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_mst_port *port;
+ int tabs = mstb->lct;
+ char prefix[10];
+ int i;
+
+ for (i = 0; i < tabs; i++)
+ prefix[i] = '\t';
+ prefix[i] = '\0';
+
+ seq_printf(m, "%smstb - [%p]: num_ports: %d\n", prefix, mstb, mstb->num_ports);
+ list_for_each_entry(port, &mstb->ports, next) {
+ seq_printf(m, "%sport %d - [%p] (%s - %s): ddps: %d, ldps: %d, sdp: %d/%d, fec: %s, conn: %p\n",
+ prefix,
+ port->port_num,
+ port,
+ port->input ? "input" : "output",
+ pdt_to_string(port->pdt),
+ port->ddps,
+ port->ldps,
+ port->num_sdp_streams,
+ port->num_sdp_stream_sinks,
+ port->fec_capable ? "true" : "false",
+ port->connector);
+ if (port->mstb)
+ drm_dp_mst_dump_mstb(m, port->mstb);
+ }
+}
+
+#define DP_PAYLOAD_TABLE_SIZE 64
+
+static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
+ char *buf)
+{
+ int i;
+
+ for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
+ if (drm_dp_dpcd_read(mgr->aux,
+ DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
+ &buf[i], 16) != 16)
+ return false;
+ }
+ return true;
+}
+
+static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_port *port, char *name,
+ int namelen)
+{
+ struct edid *mst_edid;
+
+ mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
+ drm_edid_get_monitor_name(mst_edid, name, namelen);
+ kfree(mst_edid);
+}
+
+/**
+ * drm_dp_mst_dump_topology(): dump topology to seq file.
+ * @m: seq_file to dump output to
+ * @mgr: manager to dump current topology for.
+ *
+ * helper to dump MST topology to a seq file for debugfs.
+ */
+void drm_dp_mst_dump_topology(struct seq_file *m,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_mst_topology_state *state;
+ struct drm_dp_mst_atomic_payload *payload;
+ int i, ret;
+
+ mutex_lock(&mgr->lock);
+ if (mgr->mst_primary)
+ drm_dp_mst_dump_mstb(m, mgr->mst_primary);
+
+ /* dump VCPIs */
+ mutex_unlock(&mgr->lock);
+
+ ret = drm_modeset_lock_single_interruptible(&mgr->base.lock);
+ if (ret < 0)
+ return;
+
+ state = to_drm_dp_mst_topology_state(mgr->base.state);
+ seq_printf(m, "\n*** Atomic state info ***\n");
+ seq_printf(m, "payload_mask: %x, max_payloads: %d, start_slot: %u, pbn_div: %d\n",
+ state->payload_mask, mgr->max_payloads, state->start_slot, state->pbn_div);
+
+ seq_printf(m, "\n| idx | port | vcpi | slots | pbn | dsc | sink name |\n");
+ for (i = 0; i < mgr->max_payloads; i++) {
+ list_for_each_entry(payload, &state->payloads, next) {
+ char name[14];
+
+ if (payload->vcpi != i || payload->delete)
+ continue;
+
+ fetch_monitor_name(mgr, payload->port, name, sizeof(name));
+ seq_printf(m, " %5d %6d %6d %02d - %02d %5d %5s %19s\n",
+ i,
+ payload->port->port_num,
+ payload->vcpi,
+ payload->vc_start_slot,
+ payload->vc_start_slot + payload->time_slots - 1,
+ payload->pbn,
+ payload->dsc_enabled ? "Y" : "N",
+ (*name != 0) ? name : "Unknown");
+ }
+ }
+
+ seq_printf(m, "\n*** DPCD Info ***\n");
+ mutex_lock(&mgr->lock);
+ if (mgr->mst_primary) {
+ u8 buf[DP_PAYLOAD_TABLE_SIZE];
+ int ret;
+
+ if (drm_dp_read_dpcd_caps(mgr->aux, buf) < 0) {
+ seq_printf(m, "dpcd read failed\n");
+ goto out;
+ }
+ seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
+
+ ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
+ if (ret != 2) {
+ seq_printf(m, "faux/mst read failed\n");
+ goto out;
+ }
+ seq_printf(m, "faux/mst: %*ph\n", 2, buf);
+
+ ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
+ if (ret != 1) {
+ seq_printf(m, "mst ctrl read failed\n");
+ goto out;
+ }
+ seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
+
+ /* dump the standard OUI branch header */
+ ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
+ if (ret != DP_BRANCH_OUI_HEADER_SIZE) {
+ seq_printf(m, "branch oui read failed\n");
+ goto out;
+ }
+ seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
+
+ for (i = 0x3; i < 0x8 && buf[i]; i++)
+ seq_printf(m, "%c", buf[i]);
+ seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
+ buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
+ if (dump_dp_payload_table(mgr, buf))
+ seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
+ }
+
+out:
+ mutex_unlock(&mgr->lock);
+ drm_modeset_unlock(&mgr->base.lock);
+}
+EXPORT_SYMBOL(drm_dp_mst_dump_topology);
+
+static void drm_dp_tx_work(struct work_struct *work)
+{
+ struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
+
+ mutex_lock(&mgr->qlock);
+ if (!list_empty(&mgr->tx_msg_downq))
+ process_single_down_tx_qlock(mgr);
+ mutex_unlock(&mgr->qlock);
+}
+
+static inline void
+drm_dp_delayed_destroy_port(struct drm_dp_mst_port *port)
+{
+ drm_dp_port_set_pdt(port, DP_PEER_DEVICE_NONE, port->mcs);
+
+ if (port->connector) {
+ drm_connector_unregister(port->connector);
+ drm_connector_put(port->connector);
+ }
+
+ drm_dp_mst_put_port_malloc(port);
+}
+
+static inline void
+drm_dp_delayed_destroy_mstb(struct drm_dp_mst_branch *mstb)
+{
+ struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
+ struct drm_dp_mst_port *port, *port_tmp;
+ struct drm_dp_sideband_msg_tx *txmsg, *txmsg_tmp;
+ bool wake_tx = false;
+
+ mutex_lock(&mgr->lock);
+ list_for_each_entry_safe(port, port_tmp, &mstb->ports, next) {
+ list_del(&port->next);
+ drm_dp_mst_topology_put_port(port);
+ }
+ mutex_unlock(&mgr->lock);
+
+ /* drop any tx slot msg */
+ mutex_lock(&mstb->mgr->qlock);
+ list_for_each_entry_safe(txmsg, txmsg_tmp, &mgr->tx_msg_downq, next) {
+ if (txmsg->dst != mstb)
+ continue;
+
+ txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
+ list_del(&txmsg->next);
+ wake_tx = true;
+ }
+ mutex_unlock(&mstb->mgr->qlock);
+
+ if (wake_tx)
+ wake_up_all(&mstb->mgr->tx_waitq);
+
+ drm_dp_mst_put_mstb_malloc(mstb);
+}
+
+static void drm_dp_delayed_destroy_work(struct work_struct *work)
+{
+ struct drm_dp_mst_topology_mgr *mgr =
+ container_of(work, struct drm_dp_mst_topology_mgr,
+ delayed_destroy_work);
+ bool send_hotplug = false, go_again;
+
+ /*
+ * Not a regular list traverse as we have to drop the destroy
+ * connector lock before destroying the mstb/port, to avoid AB->BA
+ * ordering between this lock and the config mutex.
+ */
+ do {
+ go_again = false;
+
+ for (;;) {
+ struct drm_dp_mst_branch *mstb;
+
+ mutex_lock(&mgr->delayed_destroy_lock);
+ mstb = list_first_entry_or_null(&mgr->destroy_branch_device_list,
+ struct drm_dp_mst_branch,
+ destroy_next);
+ if (mstb)
+ list_del(&mstb->destroy_next);
+ mutex_unlock(&mgr->delayed_destroy_lock);
+
+ if (!mstb)
+ break;
+
+ drm_dp_delayed_destroy_mstb(mstb);
+ go_again = true;
+ }
+
+ for (;;) {
+ struct drm_dp_mst_port *port;
+
+ mutex_lock(&mgr->delayed_destroy_lock);
+ port = list_first_entry_or_null(&mgr->destroy_port_list,
+ struct drm_dp_mst_port,
+ next);
+ if (port)
+ list_del(&port->next);
+ mutex_unlock(&mgr->delayed_destroy_lock);
+
+ if (!port)
+ break;
+
+ drm_dp_delayed_destroy_port(port);
+ send_hotplug = true;
+ go_again = true;
+ }
+ } while (go_again);
+
+ if (send_hotplug)
+ drm_kms_helper_hotplug_event(mgr->dev);
+}
+
+static struct drm_private_state *
+drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
+{
+ struct drm_dp_mst_topology_state *state, *old_state =
+ to_dp_mst_topology_state(obj->state);
+ struct drm_dp_mst_atomic_payload *pos, *payload;
+
+ state = kmemdup(old_state, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return NULL;
+
+ __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
+
+ INIT_LIST_HEAD(&state->payloads);
+ state->commit_deps = NULL;
+ state->num_commit_deps = 0;
+ state->pending_crtc_mask = 0;
+
+ list_for_each_entry(pos, &old_state->payloads, next) {
+ /* Prune leftover freed timeslot allocations */
+ if (pos->delete)
+ continue;
+
+ payload = kmemdup(pos, sizeof(*payload), GFP_KERNEL);
+ if (!payload)
+ goto fail;
+
+ drm_dp_mst_get_port_malloc(payload->port);
+ list_add(&payload->next, &state->payloads);
+ }
+
+ return &state->base;
+
+fail:
+ list_for_each_entry_safe(pos, payload, &state->payloads, next) {
+ drm_dp_mst_put_port_malloc(pos->port);
+ kfree(pos);
+ }
+ kfree(state);
+
+ return NULL;
+}
+
+static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
+ struct drm_private_state *state)
+{
+ struct drm_dp_mst_topology_state *mst_state =
+ to_dp_mst_topology_state(state);
+ struct drm_dp_mst_atomic_payload *pos, *tmp;
+ int i;
+
+ list_for_each_entry_safe(pos, tmp, &mst_state->payloads, next) {
+ /* We only keep references to ports with active payloads */
+ if (!pos->delete)
+ drm_dp_mst_put_port_malloc(pos->port);
+ kfree(pos);
+ }
+
+ for (i = 0; i < mst_state->num_commit_deps; i++)
+ drm_crtc_commit_put(mst_state->commit_deps[i]);
+
+ kfree(mst_state->commit_deps);
+ kfree(mst_state);
+}
+
+static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port,
+ struct drm_dp_mst_branch *branch)
+{
+ while (port->parent) {
+ if (port->parent == branch)
+ return true;
+
+ if (port->parent->port_parent)
+ port = port->parent->port_parent;
+ else
+ break;
+ }
+ return false;
+}
+
+static int
+drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port,
+ struct drm_dp_mst_topology_state *state);
+
+static int
+drm_dp_mst_atomic_check_mstb_bw_limit(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_topology_state *state)
+{
+ struct drm_dp_mst_atomic_payload *payload;
+ struct drm_dp_mst_port *port;
+ int pbn_used = 0, ret;
+ bool found = false;
+
+ /* Check that we have at least one port in our state that's downstream
+ * of this branch, otherwise we can skip this branch
+ */
+ list_for_each_entry(payload, &state->payloads, next) {
+ if (!payload->pbn ||
+ !drm_dp_mst_port_downstream_of_branch(payload->port, mstb))
+ continue;
+
+ found = true;
+ break;
+ }
+ if (!found)
+ return 0;
+
+ if (mstb->port_parent)
+ drm_dbg_atomic(mstb->mgr->dev,
+ "[MSTB:%p] [MST PORT:%p] Checking bandwidth limits on [MSTB:%p]\n",
+ mstb->port_parent->parent, mstb->port_parent, mstb);
+ else
+ drm_dbg_atomic(mstb->mgr->dev, "[MSTB:%p] Checking bandwidth limits\n", mstb);
+
+ list_for_each_entry(port, &mstb->ports, next) {
+ ret = drm_dp_mst_atomic_check_port_bw_limit(port, state);
+ if (ret < 0)
+ return ret;
+
+ pbn_used += ret;
+ }
+
+ return pbn_used;
+}
+
+static int
+drm_dp_mst_atomic_check_port_bw_limit(struct drm_dp_mst_port *port,
+ struct drm_dp_mst_topology_state *state)
+{
+ struct drm_dp_mst_atomic_payload *payload;
+ int pbn_used = 0;
+
+ if (port->pdt == DP_PEER_DEVICE_NONE)
+ return 0;
+
+ if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
+ payload = drm_atomic_get_mst_payload_state(state, port);
+ if (!payload)
+ return 0;
+
+ /*
+ * This could happen if the sink deasserted its HPD line, but
+ * the branch device still reports it as attached (PDT != NONE).
+ */
+ if (!port->full_pbn) {
+ drm_dbg_atomic(port->mgr->dev,
+ "[MSTB:%p] [MST PORT:%p] no BW available for the port\n",
+ port->parent, port);
+ return -EINVAL;
+ }
+
+ pbn_used = payload->pbn;
+ } else {
+ pbn_used = drm_dp_mst_atomic_check_mstb_bw_limit(port->mstb,
+ state);
+ if (pbn_used <= 0)
+ return pbn_used;
+ }
+
+ if (pbn_used > port->full_pbn) {
+ drm_dbg_atomic(port->mgr->dev,
+ "[MSTB:%p] [MST PORT:%p] required PBN of %d exceeds port limit of %d\n",
+ port->parent, port, pbn_used, port->full_pbn);
+ return -ENOSPC;
+ }
+
+ drm_dbg_atomic(port->mgr->dev, "[MSTB:%p] [MST PORT:%p] uses %d out of %d PBN\n",
+ port->parent, port, pbn_used, port->full_pbn);
+
+ return pbn_used;
+}
+
+static inline int
+drm_dp_mst_atomic_check_payload_alloc_limits(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_dp_mst_topology_state *mst_state)
+{
+ struct drm_dp_mst_atomic_payload *payload;
+ int avail_slots = mst_state->total_avail_slots, payload_count = 0;
+
+ list_for_each_entry(payload, &mst_state->payloads, next) {
+ /* Releasing payloads is always OK-even if the port is gone */
+ if (payload->delete) {
+ drm_dbg_atomic(mgr->dev, "[MST PORT:%p] releases all time slots\n",
+ payload->port);
+ continue;
+ }
+
+ drm_dbg_atomic(mgr->dev, "[MST PORT:%p] requires %d time slots\n",
+ payload->port, payload->time_slots);
+
+ avail_slots -= payload->time_slots;
+ if (avail_slots < 0) {
+ drm_dbg_atomic(mgr->dev,
+ "[MST PORT:%p] not enough time slots in mst state %p (avail=%d)\n",
+ payload->port, mst_state, avail_slots + payload->time_slots);
+ return -ENOSPC;
+ }
+
+ if (++payload_count > mgr->max_payloads) {
+ drm_dbg_atomic(mgr->dev,
+ "[MST MGR:%p] state %p has too many payloads (max=%d)\n",
+ mgr, mst_state, mgr->max_payloads);
+ return -EINVAL;
+ }
+
+ /* Assign a VCPI */
+ if (!payload->vcpi) {
+ payload->vcpi = ffz(mst_state->payload_mask) + 1;
+ drm_dbg_atomic(mgr->dev, "[MST PORT:%p] assigned VCPI #%d\n",
+ payload->port, payload->vcpi);
+ mst_state->payload_mask |= BIT(payload->vcpi - 1);
+ }
+ }
+
+ if (!payload_count)
+ mst_state->pbn_div = 0;
+
+ drm_dbg_atomic(mgr->dev, "[MST MGR:%p] mst state %p TU pbn_div=%d avail=%d used=%d\n",
+ mgr, mst_state, mst_state->pbn_div, avail_slots,
+ mst_state->total_avail_slots - avail_slots);
+
+ return 0;
+}
+
+/**
+ * drm_dp_mst_add_affected_dsc_crtcs
+ * @state: Pointer to the new struct drm_dp_mst_topology_state
+ * @mgr: MST topology manager
+ *
+ * Whenever there is a change in mst topology
+ * DSC configuration would have to be recalculated
+ * therefore we need to trigger modeset on all affected
+ * CRTCs in that topology
+ *
+ * See also:
+ * drm_dp_mst_atomic_enable_dsc()
+ */
+int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_mst_topology_state *mst_state;
+ struct drm_dp_mst_atomic_payload *pos;
+ struct drm_connector *connector;
+ struct drm_connector_state *conn_state;
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+
+ mst_state = drm_atomic_get_mst_topology_state(state, mgr);
+
+ if (IS_ERR(mst_state))
+ return PTR_ERR(mst_state);
+
+ list_for_each_entry(pos, &mst_state->payloads, next) {
+
+ connector = pos->port->connector;
+
+ if (!connector)
+ return -EINVAL;
+
+ conn_state = drm_atomic_get_connector_state(state, connector);
+
+ if (IS_ERR(conn_state))
+ return PTR_ERR(conn_state);
+
+ crtc = conn_state->crtc;
+
+ if (!crtc)
+ continue;
+
+ if (!drm_dp_mst_dsc_aux_for_port(pos->port))
+ continue;
+
+ crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc);
+
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+
+ drm_dbg_atomic(mgr->dev, "[MST MGR:%p] Setting mode_changed flag on CRTC %p\n",
+ mgr, crtc);
+
+ crtc_state->mode_changed = true;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs);
+
+/**
+ * drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off
+ * @state: Pointer to the new drm_atomic_state
+ * @port: Pointer to the affected MST Port
+ * @pbn: Newly recalculated bw required for link with DSC enabled
+ * @enable: Boolean flag to enable or disable DSC on the port
+ *
+ * This function enables DSC on the given Port
+ * by recalculating its vcpi from pbn provided
+ * and sets dsc_enable flag to keep track of which
+ * ports have DSC enabled
+ *
+ */
+int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
+ struct drm_dp_mst_port *port,
+ int pbn, bool enable)
+{
+ struct drm_dp_mst_topology_state *mst_state;
+ struct drm_dp_mst_atomic_payload *payload;
+ int time_slots = 0;
+
+ mst_state = drm_atomic_get_mst_topology_state(state, port->mgr);
+ if (IS_ERR(mst_state))
+ return PTR_ERR(mst_state);
+
+ payload = drm_atomic_get_mst_payload_state(mst_state, port);
+ if (!payload) {
+ drm_dbg_atomic(state->dev,
+ "[MST PORT:%p] Couldn't find payload in mst state %p\n",
+ port, mst_state);
+ return -EINVAL;
+ }
+
+ if (payload->dsc_enabled == enable) {
+ drm_dbg_atomic(state->dev,
+ "[MST PORT:%p] DSC flag is already set to %d, returning %d time slots\n",
+ port, enable, payload->time_slots);
+ time_slots = payload->time_slots;
+ }
+
+ if (enable) {
+ time_slots = drm_dp_atomic_find_time_slots(state, port->mgr, port, pbn);
+ drm_dbg_atomic(state->dev,
+ "[MST PORT:%p] Enabling DSC flag, reallocating %d time slots on the port\n",
+ port, time_slots);
+ if (time_slots < 0)
+ return -EINVAL;
+ }
+
+ payload->dsc_enabled = enable;
+
+ return time_slots;
+}
+EXPORT_SYMBOL(drm_dp_mst_atomic_enable_dsc);
+
+/**
+ * drm_dp_mst_atomic_check - Check that the new state of an MST topology in an
+ * atomic update is valid
+ * @state: Pointer to the new &struct drm_dp_mst_topology_state
+ *
+ * Checks the given topology state for an atomic update to ensure that it's
+ * valid. This includes checking whether there's enough bandwidth to support
+ * the new timeslot allocations in the atomic update.
+ *
+ * Any atomic drivers supporting DP MST must make sure to call this after
+ * checking the rest of their state in their
+ * &drm_mode_config_funcs.atomic_check() callback.
+ *
+ * See also:
+ * drm_dp_atomic_find_time_slots()
+ * drm_dp_atomic_release_time_slots()
+ *
+ * Returns:
+ *
+ * 0 if the new state is valid, negative error code otherwise.
+ */
+int drm_dp_mst_atomic_check(struct drm_atomic_state *state)
+{
+ struct drm_dp_mst_topology_mgr *mgr;
+ struct drm_dp_mst_topology_state *mst_state;
+ int i, ret = 0;
+
+ for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
+ if (!mgr->mst_state)
+ continue;
+
+ ret = drm_dp_mst_atomic_check_payload_alloc_limits(mgr, mst_state);
+ if (ret)
+ break;
+
+ mutex_lock(&mgr->lock);
+ ret = drm_dp_mst_atomic_check_mstb_bw_limit(mgr->mst_primary,
+ mst_state);
+ mutex_unlock(&mgr->lock);
+ if (ret < 0)
+ break;
+ else
+ ret = 0;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_mst_atomic_check);
+
+const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs = {
+ .atomic_duplicate_state = drm_dp_mst_duplicate_state,
+ .atomic_destroy_state = drm_dp_mst_destroy_state,
+};
+EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs);
+
+/**
+ * drm_atomic_get_mst_topology_state: get MST topology state
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object.
+ *
+ * RETURNS:
+ *
+ * The MST topology state or error pointer.
+ */
+struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
+}
+EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
+
+/**
+ * drm_atomic_get_old_mst_topology_state: get old MST topology state in atomic state, if any
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_old_private_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object.
+ *
+ * Returns:
+ *
+ * The old MST topology state, or NULL if there's no topology state for this MST mgr
+ * in the global atomic state
+ */
+struct drm_dp_mst_topology_state *
+drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_private_state *old_priv_state =
+ drm_atomic_get_old_private_obj_state(state, &mgr->base);
+
+ return old_priv_state ? to_dp_mst_topology_state(old_priv_state) : NULL;
+}
+EXPORT_SYMBOL(drm_atomic_get_old_mst_topology_state);
+
+/**
+ * drm_atomic_get_new_mst_topology_state: get new MST topology state in atomic state, if any
+ * @state: global atomic state
+ * @mgr: MST topology manager, also the private object in this case
+ *
+ * This function wraps drm_atomic_get_new_private_obj_state() passing in the MST atomic
+ * state vtable so that the private object state returned is that of a MST
+ * topology object.
+ *
+ * Returns:
+ *
+ * The new MST topology state, or NULL if there's no topology state for this MST mgr
+ * in the global atomic state
+ */
+struct drm_dp_mst_topology_state *
+drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_private_state *new_priv_state =
+ drm_atomic_get_new_private_obj_state(state, &mgr->base);
+
+ return new_priv_state ? to_dp_mst_topology_state(new_priv_state) : NULL;
+}
+EXPORT_SYMBOL(drm_atomic_get_new_mst_topology_state);
+
+/**
+ * drm_dp_mst_topology_mgr_init - initialise a topology manager
+ * @mgr: manager struct to initialise
+ * @dev: device providing this structure - for i2c addition.
+ * @aux: DP helper aux channel to talk to this device
+ * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
+ * @max_payloads: maximum number of payloads this GPU can source
+ * @conn_base_id: the connector object ID the MST device is connected to.
+ *
+ * Return 0 for success, or negative error code on failure
+ */
+int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
+ struct drm_device *dev, struct drm_dp_aux *aux,
+ int max_dpcd_transaction_bytes, int max_payloads,
+ int conn_base_id)
+{
+ struct drm_dp_mst_topology_state *mst_state;
+
+ mutex_init(&mgr->lock);
+ mutex_init(&mgr->qlock);
+ mutex_init(&mgr->delayed_destroy_lock);
+ mutex_init(&mgr->up_req_lock);
+ mutex_init(&mgr->probe_lock);
+#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
+ mutex_init(&mgr->topology_ref_history_lock);
+ stack_depot_init();
+#endif
+ INIT_LIST_HEAD(&mgr->tx_msg_downq);
+ INIT_LIST_HEAD(&mgr->destroy_port_list);
+ INIT_LIST_HEAD(&mgr->destroy_branch_device_list);
+ INIT_LIST_HEAD(&mgr->up_req_list);
+
+ /*
+ * delayed_destroy_work will be queued on a dedicated WQ, so that any
+ * requeuing will be also flushed when deiniting the topology manager.
+ */
+ mgr->delayed_destroy_wq = alloc_ordered_workqueue("drm_dp_mst_wq", 0);
+ if (mgr->delayed_destroy_wq == NULL)
+ return -ENOMEM;
+
+ INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
+ INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
+ INIT_WORK(&mgr->delayed_destroy_work, drm_dp_delayed_destroy_work);
+ INIT_WORK(&mgr->up_req_work, drm_dp_mst_up_req_work);
+ init_waitqueue_head(&mgr->tx_waitq);
+ mgr->dev = dev;
+ mgr->aux = aux;
+ mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
+ mgr->max_payloads = max_payloads;
+ mgr->conn_base_id = conn_base_id;
+
+ mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
+ if (mst_state == NULL)
+ return -ENOMEM;
+
+ mst_state->total_avail_slots = 63;
+ mst_state->start_slot = 1;
+
+ mst_state->mgr = mgr;
+ INIT_LIST_HEAD(&mst_state->payloads);
+
+ drm_atomic_private_obj_init(dev, &mgr->base,
+ &mst_state->base,
+ &drm_dp_mst_topology_state_funcs);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
+
+/**
+ * drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
+ * @mgr: manager to destroy
+ */
+void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
+{
+ drm_dp_mst_topology_mgr_set_mst(mgr, false);
+ flush_work(&mgr->work);
+ /* The following will also drain any requeued work on the WQ. */
+ if (mgr->delayed_destroy_wq) {
+ destroy_workqueue(mgr->delayed_destroy_wq);
+ mgr->delayed_destroy_wq = NULL;
+ }
+ mgr->dev = NULL;
+ mgr->aux = NULL;
+ drm_atomic_private_obj_fini(&mgr->base);
+ mgr->funcs = NULL;
+
+ mutex_destroy(&mgr->delayed_destroy_lock);
+ mutex_destroy(&mgr->qlock);
+ mutex_destroy(&mgr->lock);
+ mutex_destroy(&mgr->up_req_lock);
+ mutex_destroy(&mgr->probe_lock);
+#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
+ mutex_destroy(&mgr->topology_ref_history_lock);
+#endif
+}
+EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
+
+static bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num)
+{
+ int i;
+
+ if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)
+ return false;
+
+ for (i = 0; i < num - 1; i++) {
+ if (msgs[i].flags & I2C_M_RD ||
+ msgs[i].len > 0xff)
+ return false;
+ }
+
+ return msgs[num - 1].flags & I2C_M_RD &&
+ msgs[num - 1].len <= 0xff;
+}
+
+static bool remote_i2c_write_ok(const struct i2c_msg msgs[], int num)
+{
+ int i;
+
+ for (i = 0; i < num - 1; i++) {
+ if (msgs[i].flags & I2C_M_RD || !(msgs[i].flags & I2C_M_STOP) ||
+ msgs[i].len > 0xff)
+ return false;
+ }
+
+ return !(msgs[num - 1].flags & I2C_M_RD) && msgs[num - 1].len <= 0xff;
+}
+
+static int drm_dp_mst_i2c_read(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port,
+ struct i2c_msg *msgs, int num)
+{
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ unsigned int i;
+ struct drm_dp_sideband_msg_req_body msg;
+ struct drm_dp_sideband_msg_tx *txmsg = NULL;
+ int ret;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.req_type = DP_REMOTE_I2C_READ;
+ msg.u.i2c_read.num_transactions = num - 1;
+ msg.u.i2c_read.port_number = port->port_num;
+ for (i = 0; i < num - 1; i++) {
+ msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
+ msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
+ msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
+ msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP);
+ }
+ msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
+ msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ txmsg->dst = mstb;
+ drm_dp_encode_sideband_req(&msg, txmsg);
+
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0) {
+
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ ret = -EREMOTEIO;
+ goto out;
+ }
+ if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
+ ret = -EIO;
+ goto out;
+ }
+ memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
+ ret = num;
+ }
+out:
+ kfree(txmsg);
+ return ret;
+}
+
+static int drm_dp_mst_i2c_write(struct drm_dp_mst_branch *mstb,
+ struct drm_dp_mst_port *port,
+ struct i2c_msg *msgs, int num)
+{
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ unsigned int i;
+ struct drm_dp_sideband_msg_req_body msg;
+ struct drm_dp_sideband_msg_tx *txmsg = NULL;
+ int ret;
+
+ txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+ if (!txmsg) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ for (i = 0; i < num; i++) {
+ memset(&msg, 0, sizeof(msg));
+ msg.req_type = DP_REMOTE_I2C_WRITE;
+ msg.u.i2c_write.port_number = port->port_num;
+ msg.u.i2c_write.write_i2c_device_id = msgs[i].addr;
+ msg.u.i2c_write.num_bytes = msgs[i].len;
+ msg.u.i2c_write.bytes = msgs[i].buf;
+
+ memset(txmsg, 0, sizeof(*txmsg));
+ txmsg->dst = mstb;
+
+ drm_dp_encode_sideband_req(&msg, txmsg);
+ drm_dp_queue_down_tx(mgr, txmsg);
+
+ ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
+ if (ret > 0) {
+ if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+ ret = -EREMOTEIO;
+ goto out;
+ }
+ } else {
+ goto out;
+ }
+ }
+ ret = num;
+out:
+ kfree(txmsg);
+ return ret;
+}
+
+/* I2C device */
+static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg *msgs, int num)
+{
+ struct drm_dp_aux *aux = adapter->algo_data;
+ struct drm_dp_mst_port *port =
+ container_of(aux, struct drm_dp_mst_port, aux);
+ struct drm_dp_mst_branch *mstb;
+ struct drm_dp_mst_topology_mgr *mgr = port->mgr;
+ int ret;
+
+ mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
+ if (!mstb)
+ return -EREMOTEIO;
+
+ if (remote_i2c_read_ok(msgs, num)) {
+ ret = drm_dp_mst_i2c_read(mstb, port, msgs, num);
+ } else if (remote_i2c_write_ok(msgs, num)) {
+ ret = drm_dp_mst_i2c_write(mstb, port, msgs, num);
+ } else {
+ drm_dbg_kms(mgr->dev, "Unsupported I2C transaction for MST device\n");
+ ret = -EIO;
+ }
+
+ drm_dp_mst_topology_put_mstb(mstb);
+ return ret;
+}
+
+static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+ I2C_FUNC_SMBUS_READ_BLOCK_DATA |
+ I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
+ I2C_FUNC_10BIT_ADDR;
+}
+
+static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
+ .functionality = drm_dp_mst_i2c_functionality,
+ .master_xfer = drm_dp_mst_i2c_xfer,
+};
+
+/**
+ * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
+ * @port: The port to add the I2C bus on
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port)
+{
+ struct drm_dp_aux *aux = &port->aux;
+ struct device *parent_dev = port->mgr->dev->dev;
+
+ aux->ddc.algo = &drm_dp_mst_i2c_algo;
+ aux->ddc.algo_data = aux;
+ aux->ddc.retries = 3;
+
+ aux->ddc.class = I2C_CLASS_DDC;
+ aux->ddc.owner = THIS_MODULE;
+ /* FIXME: set the kdev of the port's connector as parent */
+ aux->ddc.dev.parent = parent_dev;
+ aux->ddc.dev.of_node = parent_dev->of_node;
+
+ strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev),
+ sizeof(aux->ddc.name));
+
+ return i2c_add_adapter(&aux->ddc);
+}
+
+/**
+ * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
+ * @port: The port to remove the I2C bus from
+ */
+static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port)
+{
+ i2c_del_adapter(&port->aux.ddc);
+}
+
+/**
+ * drm_dp_mst_is_virtual_dpcd() - Is the given port a virtual DP Peer Device
+ * @port: The port to check
+ *
+ * A single physical MST hub object can be represented in the topology
+ * by multiple branches, with virtual ports between those branches.
+ *
+ * As of DP1.4, An MST hub with internal (virtual) ports must expose
+ * certain DPCD registers over those ports. See sections 2.6.1.1.1
+ * and 2.6.1.1.2 of Display Port specification v1.4 for details.
+ *
+ * May acquire mgr->lock
+ *
+ * Returns:
+ * true if the port is a virtual DP peer device, false otherwise
+ */
+static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_port *downstream_port;
+
+ if (!port || port->dpcd_rev < DP_DPCD_REV_14)
+ return false;
+
+ /* Virtual DP Sink (Internal Display Panel) */
+ if (port->port_num >= 8)
+ return true;
+
+ /* DP-to-HDMI Protocol Converter */
+ if (port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV &&
+ !port->mcs &&
+ port->ldps)
+ return true;
+
+ /* DP-to-DP */
+ mutex_lock(&port->mgr->lock);
+ if (port->pdt == DP_PEER_DEVICE_MST_BRANCHING &&
+ port->mstb &&
+ port->mstb->num_ports == 2) {
+ list_for_each_entry(downstream_port, &port->mstb->ports, next) {
+ if (downstream_port->pdt == DP_PEER_DEVICE_SST_SINK &&
+ !downstream_port->input) {
+ mutex_unlock(&port->mgr->lock);
+ return true;
+ }
+ }
+ }
+ mutex_unlock(&port->mgr->lock);
+
+ return false;
+}
+
+/**
+ * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC
+ * @port: The port to check. A leaf of the MST tree with an attached display.
+ *
+ * Depending on the situation, DSC may be enabled via the endpoint aux,
+ * the immediately upstream aux, or the connector's physical aux.
+ *
+ * This is both the correct aux to read DSC_CAPABILITY and the
+ * correct aux to write DSC_ENABLED.
+ *
+ * This operation can be expensive (up to four aux reads), so
+ * the caller should cache the return.
+ *
+ * Returns:
+ * NULL if DSC cannot be enabled on this port, otherwise the aux device
+ */
+struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
+{
+ struct drm_dp_mst_port *immediate_upstream_port;
+ struct drm_dp_mst_port *fec_port;
+ struct drm_dp_desc desc = {};
+ u8 endpoint_fec;
+ u8 endpoint_dsc;
+
+ if (!port)
+ return NULL;
+
+ if (port->parent->port_parent)
+ immediate_upstream_port = port->parent->port_parent;
+ else
+ immediate_upstream_port = NULL;
+
+ fec_port = immediate_upstream_port;
+ while (fec_port) {
+ /*
+ * Each physical link (i.e. not a virtual port) between the
+ * output and the primary device must support FEC
+ */
+ if (!drm_dp_mst_is_virtual_dpcd(fec_port) &&
+ !fec_port->fec_capable)
+ return NULL;
+
+ fec_port = fec_port->parent->port_parent;
+ }
+
+ /* DP-to-DP peer device */
+ if (drm_dp_mst_is_virtual_dpcd(immediate_upstream_port)) {
+ u8 upstream_dsc;
+
+ if (drm_dp_dpcd_read(&port->aux,
+ DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1)
+ return NULL;
+ if (drm_dp_dpcd_read(&port->aux,
+ DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1)
+ return NULL;
+ if (drm_dp_dpcd_read(&immediate_upstream_port->aux,
+ DP_DSC_SUPPORT, &upstream_dsc, 1) != 1)
+ return NULL;
+
+ /* Enpoint decompression with DP-to-DP peer device */
+ if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) &&
+ (endpoint_fec & DP_FEC_CAPABLE) &&
+ (upstream_dsc & DP_DSC_PASSTHROUGH_IS_SUPPORTED)) {
+ port->passthrough_aux = &immediate_upstream_port->aux;
+ return &port->aux;
+ }
+
+ /* Virtual DPCD decompression with DP-to-DP peer device */
+ return &immediate_upstream_port->aux;
+ }
+
+ /* Virtual DPCD decompression with DP-to-HDMI or Virtual DP Sink */
+ if (drm_dp_mst_is_virtual_dpcd(port))
+ return &port->aux;
+
+ /*
+ * Synaptics quirk
+ * Applies to ports for which:
+ * - Physical aux has Synaptics OUI
+ * - DPv1.4 or higher
+ * - Port is on primary branch device
+ * - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG)
+ */
+ if (drm_dp_read_desc(port->mgr->aux, &desc, true))
+ return NULL;
+
+ if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
+ port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 &&
+ port->parent == port->mgr->mst_primary) {
+ u8 dpcd_ext[DP_RECEIVER_CAP_SIZE];
+
+ if (drm_dp_read_dpcd_caps(port->mgr->aux, dpcd_ext) < 0)
+ return NULL;
+
+ if ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT) &&
+ ((dpcd_ext[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_TYPE_MASK)
+ != DP_DWN_STRM_PORT_TYPE_ANALOG))
+ return port->mgr->aux;
+ }
+
+ /*
+ * The check below verifies if the MST sink
+ * connected to the GPU is capable of DSC -
+ * therefore the endpoint needs to be
+ * both DSC and FEC capable.
+ */
+ if (drm_dp_dpcd_read(&port->aux,
+ DP_DSC_SUPPORT, &endpoint_dsc, 1) != 1)
+ return NULL;
+ if (drm_dp_dpcd_read(&port->aux,
+ DP_FEC_CAPABILITY, &endpoint_fec, 1) != 1)
+ return NULL;
+ if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) &&
+ (endpoint_fec & DP_FEC_CAPABLE))
+ return &port->aux;
+
+ return NULL;
+}
+EXPORT_SYMBOL(drm_dp_mst_dsc_aux_for_port);
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology_internal.h b/drivers/gpu/drm/display/drm_dp_mst_topology_internal.h
new file mode 100644
index 000000000..a785ccbfd
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology_internal.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Declarations for DP MST related functions which are only used in selftests
+ *
+ * Copyright © 2018 Red Hat
+ * Authors:
+ * Lyude Paul <lyude@redhat.com>
+ */
+
+#ifndef _DRM_DP_MST_HELPER_INTERNAL_H_
+#define _DRM_DP_MST_HELPER_INTERNAL_H_
+
+#include <drm/display/drm_dp_mst_helper.h>
+
+void
+drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req,
+ struct drm_dp_sideband_msg_tx *raw);
+int drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw,
+ struct drm_dp_sideband_msg_req_body *req);
+void
+drm_dp_dump_sideband_msg_req_body(const struct drm_dp_sideband_msg_req_body *req,
+ int indent, struct drm_printer *printer);
+
+#endif /* !_DRM_DP_MST_HELPER_INTERNAL_H_ */
diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c b/drivers/gpu/drm/display/drm_dsc_helper.c
new file mode 100644
index 000000000..c869c6e51
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dsc_helper.c
@@ -0,0 +1,409 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2018 Intel Corp
+ *
+ * Author:
+ * Manasi Navare <manasi.d.navare@intel.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/byteorder/generic.h>
+
+#include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_dsc_helper.h>
+#include <drm/drm_print.h>
+
+/**
+ * DOC: dsc helpers
+ *
+ * VESA specification for DP 1.4 adds a new feature called Display Stream
+ * Compression (DSC) used to compress the pixel bits before sending it on
+ * DP/eDP/MIPI DSI interface. DSC is required to be enabled so that the existing
+ * display interfaces can support high resolutions at higher frames rates uisng
+ * the maximum available link capacity of these interfaces.
+ *
+ * These functions contain some common logic and helpers to deal with VESA
+ * Display Stream Compression standard required for DSC on Display Port/eDP or
+ * MIPI display interfaces.
+ */
+
+/**
+ * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
+ * for DisplayPort as per the DP 1.4 spec.
+ * @pps_header: Secondary data packet header for DSC Picture
+ * Parameter Set as defined in &struct dp_sdp_header
+ *
+ * DP 1.4 spec defines the secondary data packet for sending the
+ * picture parameter infoframes from the source to the sink.
+ * This function populates the SDP header defined in
+ * &struct dp_sdp_header.
+ */
+void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header)
+{
+ memset(pps_header, 0, sizeof(*pps_header));
+
+ pps_header->HB1 = DP_SDP_PPS;
+ pps_header->HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
+}
+EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
+
+/**
+ * drm_dsc_dp_rc_buffer_size - get rc buffer size in bytes
+ * @rc_buffer_block_size: block size code, according to DPCD offset 62h
+ * @rc_buffer_size: number of blocks - 1, according to DPCD offset 63h
+ *
+ * return:
+ * buffer size in bytes, or 0 on invalid input
+ */
+int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size)
+{
+ int size = 1024 * (rc_buffer_size + 1);
+
+ switch (rc_buffer_block_size) {
+ case DP_DSC_RC_BUF_BLK_SIZE_1:
+ return 1 * size;
+ case DP_DSC_RC_BUF_BLK_SIZE_4:
+ return 4 * size;
+ case DP_DSC_RC_BUF_BLK_SIZE_16:
+ return 16 * size;
+ case DP_DSC_RC_BUF_BLK_SIZE_64:
+ return 64 * size;
+ default:
+ return 0;
+ }
+}
+EXPORT_SYMBOL(drm_dsc_dp_rc_buffer_size);
+
+/**
+ * drm_dsc_pps_payload_pack() - Populates the DSC PPS
+ *
+ * @pps_payload:
+ * Bitwise struct for DSC Picture Parameter Set. This is defined
+ * by &struct drm_dsc_picture_parameter_set
+ * @dsc_cfg:
+ * DSC Configuration data filled by driver as defined by
+ * &struct drm_dsc_config
+ *
+ * DSC source device sends a picture parameter set (PPS) containing the
+ * information required by the sink to decode the compressed frame. Driver
+ * populates the DSC PPS struct using the DSC configuration parameters in
+ * the order expected by the DSC Display Sink device. For the DSC, the sink
+ * device expects the PPS payload in big endian format for fields
+ * that span more than 1 byte.
+ */
+void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_payload,
+ const struct drm_dsc_config *dsc_cfg)
+{
+ int i;
+
+ /* Protect against someone accidentally changing struct size */
+ BUILD_BUG_ON(sizeof(*pps_payload) !=
+ DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1 + 1);
+
+ memset(pps_payload, 0, sizeof(*pps_payload));
+
+ /* PPS 0 */
+ pps_payload->dsc_version =
+ dsc_cfg->dsc_version_minor |
+ dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
+
+ /* PPS 1, 2 is 0 */
+
+ /* PPS 3 */
+ pps_payload->pps_3 =
+ dsc_cfg->line_buf_depth |
+ dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
+
+ /* PPS 4 */
+ pps_payload->pps_4 =
+ ((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
+ DSC_PPS_MSB_SHIFT) |
+ dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
+ dsc_cfg->simple_422 << DSC_PPS_SIMPLE422_SHIFT |
+ dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
+ dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
+
+ /* PPS 5 */
+ pps_payload->bits_per_pixel_low =
+ (dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
+
+ /*
+ * The DSC panel expects the PPS packet to have big endian format
+ * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
+ * to big endian format. If format is little endian, it will swap
+ * bytes to convert to Big endian else keep it unchanged.
+ */
+
+ /* PPS 6, 7 */
+ pps_payload->pic_height = cpu_to_be16(dsc_cfg->pic_height);
+
+ /* PPS 8, 9 */
+ pps_payload->pic_width = cpu_to_be16(dsc_cfg->pic_width);
+
+ /* PPS 10, 11 */
+ pps_payload->slice_height = cpu_to_be16(dsc_cfg->slice_height);
+
+ /* PPS 12, 13 */
+ pps_payload->slice_width = cpu_to_be16(dsc_cfg->slice_width);
+
+ /* PPS 14, 15 */
+ pps_payload->chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
+
+ /* PPS 16 */
+ pps_payload->initial_xmit_delay_high =
+ ((dsc_cfg->initial_xmit_delay &
+ DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
+ DSC_PPS_MSB_SHIFT);
+
+ /* PPS 17 */
+ pps_payload->initial_xmit_delay_low =
+ (dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
+
+ /* PPS 18, 19 */
+ pps_payload->initial_dec_delay =
+ cpu_to_be16(dsc_cfg->initial_dec_delay);
+
+ /* PPS 20 is 0 */
+
+ /* PPS 21 */
+ pps_payload->initial_scale_value =
+ dsc_cfg->initial_scale_value;
+
+ /* PPS 22, 23 */
+ pps_payload->scale_increment_interval =
+ cpu_to_be16(dsc_cfg->scale_increment_interval);
+
+ /* PPS 24 */
+ pps_payload->scale_decrement_interval_high =
+ ((dsc_cfg->scale_decrement_interval &
+ DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
+ DSC_PPS_MSB_SHIFT);
+
+ /* PPS 25 */
+ pps_payload->scale_decrement_interval_low =
+ (dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
+
+ /* PPS 26[7:0], PPS 27[7:5] RESERVED */
+
+ /* PPS 27 */
+ pps_payload->first_line_bpg_offset =
+ dsc_cfg->first_line_bpg_offset;
+
+ /* PPS 28, 29 */
+ pps_payload->nfl_bpg_offset =
+ cpu_to_be16(dsc_cfg->nfl_bpg_offset);
+
+ /* PPS 30, 31 */
+ pps_payload->slice_bpg_offset =
+ cpu_to_be16(dsc_cfg->slice_bpg_offset);
+
+ /* PPS 32, 33 */
+ pps_payload->initial_offset =
+ cpu_to_be16(dsc_cfg->initial_offset);
+
+ /* PPS 34, 35 */
+ pps_payload->final_offset = cpu_to_be16(dsc_cfg->final_offset);
+
+ /* PPS 36 */
+ pps_payload->flatness_min_qp = dsc_cfg->flatness_min_qp;
+
+ /* PPS 37 */
+ pps_payload->flatness_max_qp = dsc_cfg->flatness_max_qp;
+
+ /* PPS 38, 39 */
+ pps_payload->rc_model_size = cpu_to_be16(dsc_cfg->rc_model_size);
+
+ /* PPS 40 */
+ pps_payload->rc_edge_factor = DSC_RC_EDGE_FACTOR_CONST;
+
+ /* PPS 41 */
+ pps_payload->rc_quant_incr_limit0 =
+ dsc_cfg->rc_quant_incr_limit0;
+
+ /* PPS 42 */
+ pps_payload->rc_quant_incr_limit1 =
+ dsc_cfg->rc_quant_incr_limit1;
+
+ /* PPS 43 */
+ pps_payload->rc_tgt_offset = DSC_RC_TGT_OFFSET_LO_CONST |
+ DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
+
+ /* PPS 44 - 57 */
+ for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
+ pps_payload->rc_buf_thresh[i] =
+ dsc_cfg->rc_buf_thresh[i];
+
+ /* PPS 58 - 87 */
+ /*
+ * For DSC sink programming the RC Range parameter fields
+ * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
+ */
+ for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+ pps_payload->rc_range_parameters[i] =
+ cpu_to_be16((dsc_cfg->rc_range_params[i].range_min_qp <<
+ DSC_PPS_RC_RANGE_MINQP_SHIFT) |
+ (dsc_cfg->rc_range_params[i].range_max_qp <<
+ DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
+ (dsc_cfg->rc_range_params[i].range_bpg_offset));
+ }
+
+ /* PPS 88 */
+ pps_payload->native_422_420 = dsc_cfg->native_422 |
+ dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
+
+ /* PPS 89 */
+ pps_payload->second_line_bpg_offset =
+ dsc_cfg->second_line_bpg_offset;
+
+ /* PPS 90, 91 */
+ pps_payload->nsl_bpg_offset =
+ cpu_to_be16(dsc_cfg->nsl_bpg_offset);
+
+ /* PPS 92, 93 */
+ pps_payload->second_line_offset_adj =
+ cpu_to_be16(dsc_cfg->second_line_offset_adj);
+
+ /* PPS 94 - 127 are O */
+}
+EXPORT_SYMBOL(drm_dsc_pps_payload_pack);
+
+/**
+ * drm_dsc_compute_rc_parameters() - Write rate control
+ * parameters to the dsc configuration defined in
+ * &struct drm_dsc_config in accordance with the DSC 1.2
+ * specification. Some configuration fields must be present
+ * beforehand.
+ *
+ * @vdsc_cfg:
+ * DSC Configuration data partially filled by driver
+ */
+int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
+{
+ unsigned long groups_per_line = 0;
+ unsigned long groups_total = 0;
+ unsigned long num_extra_mux_bits = 0;
+ unsigned long slice_bits = 0;
+ unsigned long hrd_delay = 0;
+ unsigned long final_scale = 0;
+ unsigned long rbs_min = 0;
+
+ if (vdsc_cfg->native_420 || vdsc_cfg->native_422) {
+ /* Number of groups used to code each line of a slice */
+ groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width / 2,
+ DSC_RC_PIXELS_PER_GROUP);
+
+ /* chunksize in Bytes */
+ vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width / 2 *
+ vdsc_cfg->bits_per_pixel,
+ (8 * 16));
+ } else {
+ /* Number of groups used to code each line of a slice */
+ groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width,
+ DSC_RC_PIXELS_PER_GROUP);
+
+ /* chunksize in Bytes */
+ vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width *
+ vdsc_cfg->bits_per_pixel,
+ (8 * 16));
+ }
+
+ if (vdsc_cfg->convert_rgb)
+ num_extra_mux_bits = 3 * (vdsc_cfg->mux_word_size +
+ (4 * vdsc_cfg->bits_per_component + 4)
+ - 2);
+ else if (vdsc_cfg->native_422)
+ num_extra_mux_bits = 4 * vdsc_cfg->mux_word_size +
+ (4 * vdsc_cfg->bits_per_component + 4) +
+ 3 * (4 * vdsc_cfg->bits_per_component) - 2;
+ else
+ num_extra_mux_bits = 3 * vdsc_cfg->mux_word_size +
+ (4 * vdsc_cfg->bits_per_component + 4) +
+ 2 * (4 * vdsc_cfg->bits_per_component) - 2;
+ /* Number of bits in one Slice */
+ slice_bits = 8 * vdsc_cfg->slice_chunk_size * vdsc_cfg->slice_height;
+
+ while ((num_extra_mux_bits > 0) &&
+ ((slice_bits - num_extra_mux_bits) % vdsc_cfg->mux_word_size))
+ num_extra_mux_bits--;
+
+ if (groups_per_line < vdsc_cfg->initial_scale_value - 8)
+ vdsc_cfg->initial_scale_value = groups_per_line + 8;
+
+ /* scale_decrement_interval calculation according to DSC spec 1.11 */
+ if (vdsc_cfg->initial_scale_value > 8)
+ vdsc_cfg->scale_decrement_interval = groups_per_line /
+ (vdsc_cfg->initial_scale_value - 8);
+ else
+ vdsc_cfg->scale_decrement_interval = DSC_SCALE_DECREMENT_INTERVAL_MAX;
+
+ vdsc_cfg->final_offset = vdsc_cfg->rc_model_size -
+ (vdsc_cfg->initial_xmit_delay *
+ vdsc_cfg->bits_per_pixel + 8) / 16 + num_extra_mux_bits;
+
+ if (vdsc_cfg->final_offset >= vdsc_cfg->rc_model_size) {
+ DRM_DEBUG_KMS("FinalOfs < RcModelSze for this InitialXmitDelay\n");
+ return -ERANGE;
+ }
+
+ final_scale = (vdsc_cfg->rc_model_size * 8) /
+ (vdsc_cfg->rc_model_size - vdsc_cfg->final_offset);
+ if (vdsc_cfg->slice_height > 1)
+ /*
+ * NflBpgOffset is 16 bit value with 11 fractional bits
+ * hence we multiply by 2^11 for preserving the
+ * fractional part
+ */
+ vdsc_cfg->nfl_bpg_offset = DIV_ROUND_UP((vdsc_cfg->first_line_bpg_offset << 11),
+ (vdsc_cfg->slice_height - 1));
+ else
+ vdsc_cfg->nfl_bpg_offset = 0;
+
+ /* Number of groups used to code the entire slice */
+ groups_total = groups_per_line * vdsc_cfg->slice_height;
+
+ /* slice_bpg_offset is 16 bit value with 11 fractional bits */
+ vdsc_cfg->slice_bpg_offset = DIV_ROUND_UP(((vdsc_cfg->rc_model_size -
+ vdsc_cfg->initial_offset +
+ num_extra_mux_bits) << 11),
+ groups_total);
+
+ if (final_scale > 9) {
+ /*
+ * ScaleIncrementInterval =
+ * finaloffset/((NflBpgOffset + SliceBpgOffset)*8(finalscale - 1.125))
+ * as (NflBpgOffset + SliceBpgOffset) has 11 bit fractional value,
+ * we need divide by 2^11 from pstDscCfg values
+ */
+ vdsc_cfg->scale_increment_interval =
+ (vdsc_cfg->final_offset * (1 << 11)) /
+ ((vdsc_cfg->nfl_bpg_offset +
+ vdsc_cfg->slice_bpg_offset) *
+ (final_scale - 9));
+ } else {
+ /*
+ * If finalScaleValue is less than or equal to 9, a value of 0 should
+ * be used to disable the scale increment at the end of the slice
+ */
+ vdsc_cfg->scale_increment_interval = 0;
+ }
+
+ /*
+ * DSC spec mentions that bits_per_pixel specifies the target
+ * bits/pixel (bpp) rate that is used by the encoder,
+ * in steps of 1/16 of a bit per pixel
+ */
+ rbs_min = vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset +
+ DIV_ROUND_UP(vdsc_cfg->initial_xmit_delay *
+ vdsc_cfg->bits_per_pixel, 16) +
+ groups_per_line * vdsc_cfg->first_line_bpg_offset;
+
+ hrd_delay = DIV_ROUND_UP((rbs_min * 16), vdsc_cfg->bits_per_pixel);
+ vdsc_cfg->rc_bits = (hrd_delay * vdsc_cfg->bits_per_pixel) / 16;
+ vdsc_cfg->initial_dec_delay = hrd_delay - vdsc_cfg->initial_xmit_delay;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);
diff --git a/drivers/gpu/drm/display/drm_hdcp_helper.c b/drivers/gpu/drm/display/drm_hdcp_helper.c
new file mode 100644
index 000000000..e78999c72
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_hdcp_helper.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Intel Corporation.
+ *
+ * Authors:
+ * Ramalingam C <ramalingam.c@intel.com>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/firmware.h>
+
+#include <drm/display/drm_hdcp_helper.h>
+#include <drm/drm_sysfs.h>
+#include <drm/drm_print.h>
+#include <drm/drm_device.h>
+#include <drm/drm_property.h>
+#include <drm/drm_mode_object.h>
+#include <drm/drm_connector.h>
+
+static inline void drm_hdcp_print_ksv(const u8 *ksv)
+{
+ DRM_DEBUG("\t%#02x, %#02x, %#02x, %#02x, %#02x\n",
+ ksv[0], ksv[1], ksv[2], ksv[3], ksv[4]);
+}
+
+static u32 drm_hdcp_get_revoked_ksv_count(const u8 *buf, u32 vrls_length)
+{
+ u32 parsed_bytes = 0, ksv_count = 0, vrl_ksv_cnt, vrl_sz;
+
+ while (parsed_bytes < vrls_length) {
+ vrl_ksv_cnt = *buf;
+ ksv_count += vrl_ksv_cnt;
+
+ vrl_sz = (vrl_ksv_cnt * DRM_HDCP_KSV_LEN) + 1;
+ buf += vrl_sz;
+ parsed_bytes += vrl_sz;
+ }
+
+ /*
+ * When vrls are not valid, ksvs are not considered.
+ * Hence SRM will be discarded.
+ */
+ if (parsed_bytes != vrls_length)
+ ksv_count = 0;
+
+ return ksv_count;
+}
+
+static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 **revoked_ksv_list,
+ u32 vrls_length)
+{
+ u32 vrl_ksv_cnt, vrl_ksv_sz, vrl_idx = 0;
+ u32 parsed_bytes = 0, ksv_count = 0;
+
+ do {
+ vrl_ksv_cnt = *buf;
+ vrl_ksv_sz = vrl_ksv_cnt * DRM_HDCP_KSV_LEN;
+
+ buf++;
+
+ DRM_DEBUG("vrl: %d, Revoked KSVs: %d\n", vrl_idx++,
+ vrl_ksv_cnt);
+ memcpy((*revoked_ksv_list) + (ksv_count * DRM_HDCP_KSV_LEN),
+ buf, vrl_ksv_sz);
+
+ ksv_count += vrl_ksv_cnt;
+ buf += vrl_ksv_sz;
+
+ parsed_bytes += (vrl_ksv_sz + 1);
+ } while (parsed_bytes < vrls_length);
+
+ return ksv_count;
+}
+
+static inline u32 get_vrl_length(const u8 *buf)
+{
+ return drm_hdcp_be24_to_cpu(buf);
+}
+
+static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
+{
+ struct hdcp_srm_header *header;
+ u32 vrl_length, ksv_count;
+
+ if (count < (sizeof(struct hdcp_srm_header) +
+ DRM_HDCP_1_4_VRL_LENGTH_SIZE + DRM_HDCP_1_4_DCP_SIG_SIZE)) {
+ DRM_ERROR("Invalid blob length\n");
+ return -EINVAL;
+ }
+
+ header = (struct hdcp_srm_header *)buf;
+ DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n",
+ header->srm_id,
+ be16_to_cpu(header->srm_version), header->srm_gen_no);
+
+ WARN_ON(header->reserved);
+
+ buf = buf + sizeof(*header);
+ vrl_length = get_vrl_length(buf);
+ if (count < (sizeof(struct hdcp_srm_header) + vrl_length) ||
+ vrl_length < (DRM_HDCP_1_4_VRL_LENGTH_SIZE +
+ DRM_HDCP_1_4_DCP_SIG_SIZE)) {
+ DRM_ERROR("Invalid blob length or vrl length\n");
+ return -EINVAL;
+ }
+
+ /* Length of the all vrls combined */
+ vrl_length -= (DRM_HDCP_1_4_VRL_LENGTH_SIZE +
+ DRM_HDCP_1_4_DCP_SIG_SIZE);
+
+ if (!vrl_length) {
+ DRM_ERROR("No vrl found\n");
+ return -EINVAL;
+ }
+
+ buf += DRM_HDCP_1_4_VRL_LENGTH_SIZE;
+ ksv_count = drm_hdcp_get_revoked_ksv_count(buf, vrl_length);
+ if (!ksv_count) {
+ DRM_DEBUG("Revoked KSV count is 0\n");
+ return 0;
+ }
+
+ *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
+ if (!*revoked_ksv_list) {
+ DRM_ERROR("Out of Memory\n");
+ return -ENOMEM;
+ }
+
+ if (drm_hdcp_get_revoked_ksvs(buf, revoked_ksv_list,
+ vrl_length) != ksv_count) {
+ *revoked_ksv_cnt = 0;
+ kfree(*revoked_ksv_list);
+ return -EINVAL;
+ }
+
+ *revoked_ksv_cnt = ksv_count;
+ return 0;
+}
+
+static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
+{
+ struct hdcp_srm_header *header;
+ u32 vrl_length, ksv_count, ksv_sz;
+
+ if (count < (sizeof(struct hdcp_srm_header) +
+ DRM_HDCP_2_VRL_LENGTH_SIZE + DRM_HDCP_2_DCP_SIG_SIZE)) {
+ DRM_ERROR("Invalid blob length\n");
+ return -EINVAL;
+ }
+
+ header = (struct hdcp_srm_header *)buf;
+ DRM_DEBUG("SRM ID: 0x%x, SRM Ver: 0x%x, SRM Gen No: 0x%x\n",
+ header->srm_id & DRM_HDCP_SRM_ID_MASK,
+ be16_to_cpu(header->srm_version), header->srm_gen_no);
+
+ if (header->reserved)
+ return -EINVAL;
+
+ buf = buf + sizeof(*header);
+ vrl_length = get_vrl_length(buf);
+
+ if (count < (sizeof(struct hdcp_srm_header) + vrl_length) ||
+ vrl_length < (DRM_HDCP_2_VRL_LENGTH_SIZE +
+ DRM_HDCP_2_DCP_SIG_SIZE)) {
+ DRM_ERROR("Invalid blob length or vrl length\n");
+ return -EINVAL;
+ }
+
+ /* Length of the all vrls combined */
+ vrl_length -= (DRM_HDCP_2_VRL_LENGTH_SIZE +
+ DRM_HDCP_2_DCP_SIG_SIZE);
+
+ if (!vrl_length) {
+ DRM_ERROR("No vrl found\n");
+ return -EINVAL;
+ }
+
+ buf += DRM_HDCP_2_VRL_LENGTH_SIZE;
+ ksv_count = (*buf << 2) | DRM_HDCP_2_KSV_COUNT_2_LSBITS(*(buf + 1));
+ if (!ksv_count) {
+ DRM_DEBUG("Revoked KSV count is 0\n");
+ return 0;
+ }
+
+ *revoked_ksv_list = kcalloc(ksv_count, DRM_HDCP_KSV_LEN, GFP_KERNEL);
+ if (!*revoked_ksv_list) {
+ DRM_ERROR("Out of Memory\n");
+ return -ENOMEM;
+ }
+
+ ksv_sz = ksv_count * DRM_HDCP_KSV_LEN;
+ buf += DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ;
+
+ DRM_DEBUG("Revoked KSVs: %d\n", ksv_count);
+ memcpy(*revoked_ksv_list, buf, ksv_sz);
+
+ *revoked_ksv_cnt = ksv_count;
+ return 0;
+}
+
+static inline bool is_srm_version_hdcp1(const u8 *buf)
+{
+ return *buf == (u8)(DRM_HDCP_1_4_SRM_ID << 4);
+}
+
+static inline bool is_srm_version_hdcp2(const u8 *buf)
+{
+ return *buf == (u8)(DRM_HDCP_2_SRM_ID << 4 | DRM_HDCP_2_INDICATOR);
+}
+
+static int drm_hdcp_srm_update(const u8 *buf, size_t count,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
+{
+ if (count < sizeof(struct hdcp_srm_header))
+ return -EINVAL;
+
+ if (is_srm_version_hdcp1(buf))
+ return drm_hdcp_parse_hdcp1_srm(buf, count, revoked_ksv_list,
+ revoked_ksv_cnt);
+ else if (is_srm_version_hdcp2(buf))
+ return drm_hdcp_parse_hdcp2_srm(buf, count, revoked_ksv_list,
+ revoked_ksv_cnt);
+ else
+ return -EINVAL;
+}
+
+static int drm_hdcp_request_srm(struct drm_device *drm_dev,
+ u8 **revoked_ksv_list, u32 *revoked_ksv_cnt)
+{
+ char fw_name[36] = "display_hdcp_srm.bin";
+ const struct firmware *fw;
+ int ret;
+
+ ret = request_firmware_direct(&fw, (const char *)fw_name,
+ drm_dev->dev);
+ if (ret < 0) {
+ *revoked_ksv_cnt = 0;
+ *revoked_ksv_list = NULL;
+ ret = 0;
+ goto exit;
+ }
+
+ if (fw->size && fw->data)
+ ret = drm_hdcp_srm_update(fw->data, fw->size, revoked_ksv_list,
+ revoked_ksv_cnt);
+
+exit:
+ release_firmware(fw);
+ return ret;
+}
+
+/**
+ * drm_hdcp_check_ksvs_revoked - Check the revoked status of the IDs
+ *
+ * @drm_dev: drm_device for which HDCP revocation check is requested
+ * @ksvs: List of KSVs (HDCP receiver IDs)
+ * @ksv_count: KSV count passed in through @ksvs
+ *
+ * This function reads the HDCP System renewability Message(SRM Table)
+ * from userspace as a firmware and parses it for the revoked HDCP
+ * KSVs(Receiver IDs) detected by DCP LLC. Once the revoked KSVs are known,
+ * revoked state of the KSVs in the list passed in by display drivers are
+ * decided and response is sent.
+ *
+ * SRM should be presented in the name of "display_hdcp_srm.bin".
+ *
+ * Format of the SRM table, that userspace needs to write into the binary file,
+ * is defined at:
+ * 1. Renewability chapter on 55th page of HDCP 1.4 specification
+ * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20Specification%20Rev1_4_Secure.pdf
+ * 2. Renewability chapter on 63rd page of HDCP 2.2 specification
+ * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf
+ *
+ * Returns:
+ * Count of the revoked KSVs or -ve error number in case of the failure.
+ */
+int drm_hdcp_check_ksvs_revoked(struct drm_device *drm_dev, u8 *ksvs,
+ u32 ksv_count)
+{
+ u32 revoked_ksv_cnt = 0, i, j;
+ u8 *revoked_ksv_list = NULL;
+ int ret = 0;
+
+ ret = drm_hdcp_request_srm(drm_dev, &revoked_ksv_list,
+ &revoked_ksv_cnt);
+ if (ret)
+ return ret;
+
+ /* revoked_ksv_cnt will be zero when above function failed */
+ for (i = 0; i < revoked_ksv_cnt; i++)
+ for (j = 0; j < ksv_count; j++)
+ if (!memcmp(&ksvs[j * DRM_HDCP_KSV_LEN],
+ &revoked_ksv_list[i * DRM_HDCP_KSV_LEN],
+ DRM_HDCP_KSV_LEN)) {
+ DRM_DEBUG("Revoked KSV is ");
+ drm_hdcp_print_ksv(&ksvs[j * DRM_HDCP_KSV_LEN]);
+ ret++;
+ }
+
+ kfree(revoked_ksv_list);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(drm_hdcp_check_ksvs_revoked);
+
+static struct drm_prop_enum_list drm_cp_enum_list[] = {
+ { DRM_MODE_CONTENT_PROTECTION_UNDESIRED, "Undesired" },
+ { DRM_MODE_CONTENT_PROTECTION_DESIRED, "Desired" },
+ { DRM_MODE_CONTENT_PROTECTION_ENABLED, "Enabled" },
+};
+DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list)
+
+static struct drm_prop_enum_list drm_hdcp_content_type_enum_list[] = {
+ { DRM_MODE_HDCP_CONTENT_TYPE0, "HDCP Type0" },
+ { DRM_MODE_HDCP_CONTENT_TYPE1, "HDCP Type1" },
+};
+DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name,
+ drm_hdcp_content_type_enum_list)
+
+/**
+ * drm_connector_attach_content_protection_property - attach content protection
+ * property
+ *
+ * @connector: connector to attach CP property on.
+ * @hdcp_content_type: is HDCP Content Type property needed for connector
+ *
+ * This is used to add support for content protection on select connectors.
+ * Content Protection is intentionally vague to allow for different underlying
+ * technologies, however it is most implemented by HDCP.
+ *
+ * When hdcp_content_type is true enum property called HDCP Content Type is
+ * created (if it is not already) and attached to the connector.
+ *
+ * This property is used for sending the protected content's stream type
+ * from userspace to kernel on selected connectors. Protected content provider
+ * will decide their type of their content and declare the same to kernel.
+ *
+ * Content type will be used during the HDCP 2.2 authentication.
+ * Content type will be set to &drm_connector_state.hdcp_content_type.
+ *
+ * The content protection will be set to &drm_connector_state.content_protection
+ *
+ * When kernel triggered content protection state change like DESIRED->ENABLED
+ * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update
+ * the content protection state of a connector.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_attach_content_protection_property(
+ struct drm_connector *connector, bool hdcp_content_type)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_property *prop =
+ dev->mode_config.content_protection_property;
+
+ if (!prop)
+ prop = drm_property_create_enum(dev, 0, "Content Protection",
+ drm_cp_enum_list,
+ ARRAY_SIZE(drm_cp_enum_list));
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&connector->base, prop,
+ DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
+ dev->mode_config.content_protection_property = prop;
+
+ if (!hdcp_content_type)
+ return 0;
+
+ prop = dev->mode_config.hdcp_content_type_property;
+ if (!prop)
+ prop = drm_property_create_enum(dev, 0, "HDCP Content Type",
+ drm_hdcp_content_type_enum_list,
+ ARRAY_SIZE(
+ drm_hdcp_content_type_enum_list));
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&connector->base, prop,
+ DRM_MODE_HDCP_CONTENT_TYPE0);
+ dev->mode_config.hdcp_content_type_property = prop;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
+
+/**
+ * drm_hdcp_update_content_protection - Updates the content protection state
+ * of a connector
+ *
+ * @connector: drm_connector on which content protection state needs an update
+ * @val: New state of the content protection property
+ *
+ * This function can be used by display drivers, to update the kernel triggered
+ * content protection state changes of a drm_connector such as DESIRED->ENABLED
+ * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED,
+ * as userspace is triggering such state change and kernel performs it without
+ * fail.This function update the new state of the property into the connector's
+ * state and generate an uevent to notify the userspace.
+ */
+void drm_hdcp_update_content_protection(struct drm_connector *connector,
+ u64 val)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_connector_state *state = connector->state;
+
+ WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+ if (state->content_protection == val)
+ return;
+
+ state->content_protection = val;
+ drm_sysfs_connector_status_event(connector,
+ dev->mode_config.content_protection_property);
+}
+EXPORT_SYMBOL(drm_hdcp_update_content_protection);
diff --git a/drivers/gpu/drm/display/drm_hdmi_helper.c b/drivers/gpu/drm/display/drm_hdmi_helper.c
new file mode 100644
index 000000000..faf5e9efa
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_hdmi_helper.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: MIT
+
+#include <linux/module.h>
+
+#include <drm/display/drm_hdmi_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_print.h>
+#include <drm/drm_property.h>
+
+static inline bool is_eotf_supported(u8 output_eotf, u8 sink_eotf)
+{
+ return sink_eotf & BIT(output_eotf);
+}
+
+/**
+ * drm_hdmi_infoframe_set_hdr_metadata() - fill an HDMI DRM infoframe with
+ * HDR metadata from userspace
+ * @frame: HDMI DRM infoframe
+ * @conn_state: Connector state containing HDR metadata
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_hdmi_infoframe_set_hdr_metadata(struct hdmi_drm_infoframe *frame,
+ const struct drm_connector_state *conn_state)
+{
+ struct drm_connector *connector;
+ struct hdr_output_metadata *hdr_metadata;
+ int err;
+
+ if (!frame || !conn_state)
+ return -EINVAL;
+
+ connector = conn_state->connector;
+
+ if (!conn_state->hdr_output_metadata)
+ return -EINVAL;
+
+ hdr_metadata = conn_state->hdr_output_metadata->data;
+
+ if (!hdr_metadata || !connector)
+ return -EINVAL;
+
+ /* Sink EOTF is Bit map while infoframe is absolute values */
+ if (!is_eotf_supported(hdr_metadata->hdmi_metadata_type1.eotf,
+ connector->hdr_sink_metadata.hdmi_type1.eotf))
+ DRM_DEBUG_KMS("Unknown EOTF %d\n", hdr_metadata->hdmi_metadata_type1.eotf);
+
+ err = hdmi_drm_infoframe_init(frame);
+ if (err < 0)
+ return err;
+
+ frame->eotf = hdr_metadata->hdmi_metadata_type1.eotf;
+ frame->metadata_type = hdr_metadata->hdmi_metadata_type1.metadata_type;
+
+ BUILD_BUG_ON(sizeof(frame->display_primaries) !=
+ sizeof(hdr_metadata->hdmi_metadata_type1.display_primaries));
+ BUILD_BUG_ON(sizeof(frame->white_point) !=
+ sizeof(hdr_metadata->hdmi_metadata_type1.white_point));
+
+ memcpy(&frame->display_primaries,
+ &hdr_metadata->hdmi_metadata_type1.display_primaries,
+ sizeof(frame->display_primaries));
+
+ memcpy(&frame->white_point,
+ &hdr_metadata->hdmi_metadata_type1.white_point,
+ sizeof(frame->white_point));
+
+ frame->max_display_mastering_luminance =
+ hdr_metadata->hdmi_metadata_type1.max_display_mastering_luminance;
+ frame->min_display_mastering_luminance =
+ hdr_metadata->hdmi_metadata_type1.min_display_mastering_luminance;
+ frame->max_fall = hdr_metadata->hdmi_metadata_type1.max_fall;
+ frame->max_cll = hdr_metadata->hdmi_metadata_type1.max_cll;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_hdmi_infoframe_set_hdr_metadata);
+
+/* HDMI Colorspace Spec Definitions */
+#define FULL_COLORIMETRY_MASK 0x1FF
+#define NORMAL_COLORIMETRY_MASK 0x3
+#define EXTENDED_COLORIMETRY_MASK 0x7
+#define EXTENDED_ACE_COLORIMETRY_MASK 0xF
+
+#define C(x) ((x) << 0)
+#define EC(x) ((x) << 2)
+#define ACE(x) ((x) << 5)
+
+#define HDMI_COLORIMETRY_NO_DATA 0x0
+#define HDMI_COLORIMETRY_SMPTE_170M_YCC (C(1) | EC(0) | ACE(0))
+#define HDMI_COLORIMETRY_BT709_YCC (C(2) | EC(0) | ACE(0))
+#define HDMI_COLORIMETRY_XVYCC_601 (C(3) | EC(0) | ACE(0))
+#define HDMI_COLORIMETRY_XVYCC_709 (C(3) | EC(1) | ACE(0))
+#define HDMI_COLORIMETRY_SYCC_601 (C(3) | EC(2) | ACE(0))
+#define HDMI_COLORIMETRY_OPYCC_601 (C(3) | EC(3) | ACE(0))
+#define HDMI_COLORIMETRY_OPRGB (C(3) | EC(4) | ACE(0))
+#define HDMI_COLORIMETRY_BT2020_CYCC (C(3) | EC(5) | ACE(0))
+#define HDMI_COLORIMETRY_BT2020_RGB (C(3) | EC(6) | ACE(0))
+#define HDMI_COLORIMETRY_BT2020_YCC (C(3) | EC(6) | ACE(0))
+#define HDMI_COLORIMETRY_DCI_P3_RGB_D65 (C(3) | EC(7) | ACE(0))
+#define HDMI_COLORIMETRY_DCI_P3_RGB_THEATER (C(3) | EC(7) | ACE(1))
+
+static const u32 hdmi_colorimetry_val[] = {
+ [DRM_MODE_COLORIMETRY_NO_DATA] = HDMI_COLORIMETRY_NO_DATA,
+ [DRM_MODE_COLORIMETRY_SMPTE_170M_YCC] = HDMI_COLORIMETRY_SMPTE_170M_YCC,
+ [DRM_MODE_COLORIMETRY_BT709_YCC] = HDMI_COLORIMETRY_BT709_YCC,
+ [DRM_MODE_COLORIMETRY_XVYCC_601] = HDMI_COLORIMETRY_XVYCC_601,
+ [DRM_MODE_COLORIMETRY_XVYCC_709] = HDMI_COLORIMETRY_XVYCC_709,
+ [DRM_MODE_COLORIMETRY_SYCC_601] = HDMI_COLORIMETRY_SYCC_601,
+ [DRM_MODE_COLORIMETRY_OPYCC_601] = HDMI_COLORIMETRY_OPYCC_601,
+ [DRM_MODE_COLORIMETRY_OPRGB] = HDMI_COLORIMETRY_OPRGB,
+ [DRM_MODE_COLORIMETRY_BT2020_CYCC] = HDMI_COLORIMETRY_BT2020_CYCC,
+ [DRM_MODE_COLORIMETRY_BT2020_RGB] = HDMI_COLORIMETRY_BT2020_RGB,
+ [DRM_MODE_COLORIMETRY_BT2020_YCC] = HDMI_COLORIMETRY_BT2020_YCC,
+};
+
+#undef C
+#undef EC
+#undef ACE
+
+/**
+ * drm_hdmi_avi_infoframe_colorimetry() - fill the HDMI AVI infoframe
+ * colorimetry information
+ * @frame: HDMI AVI infoframe
+ * @conn_state: connector state
+ */
+void drm_hdmi_avi_infoframe_colorimetry(struct hdmi_avi_infoframe *frame,
+ const struct drm_connector_state *conn_state)
+{
+ u32 colorimetry_val;
+ u32 colorimetry_index = conn_state->colorspace & FULL_COLORIMETRY_MASK;
+
+ if (colorimetry_index >= ARRAY_SIZE(hdmi_colorimetry_val))
+ colorimetry_val = HDMI_COLORIMETRY_NO_DATA;
+ else
+ colorimetry_val = hdmi_colorimetry_val[colorimetry_index];
+
+ frame->colorimetry = colorimetry_val & NORMAL_COLORIMETRY_MASK;
+ /*
+ * ToDo: Extend it for ACE formats as well. Modify the infoframe
+ * structure and extend it in drivers/video/hdmi
+ */
+ frame->extended_colorimetry = (colorimetry_val >> 2) &
+ EXTENDED_COLORIMETRY_MASK;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_colorimetry);
+
+/**
+ * drm_hdmi_avi_infoframe_bars() - fill the HDMI AVI infoframe
+ * bar information
+ * @frame: HDMI AVI infoframe
+ * @conn_state: connector state
+ */
+void drm_hdmi_avi_infoframe_bars(struct hdmi_avi_infoframe *frame,
+ const struct drm_connector_state *conn_state)
+{
+ frame->right_bar = conn_state->tv.margins.right;
+ frame->left_bar = conn_state->tv.margins.left;
+ frame->top_bar = conn_state->tv.margins.top;
+ frame->bottom_bar = conn_state->tv.margins.bottom;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_bars);
+
+/**
+ * drm_hdmi_avi_infoframe_content_type() - fill the HDMI AVI infoframe
+ * content type information, based
+ * on correspondent DRM property.
+ * @frame: HDMI AVI infoframe
+ * @conn_state: DRM display connector state
+ *
+ */
+void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
+ const struct drm_connector_state *conn_state)
+{
+ switch (conn_state->content_type) {
+ case DRM_MODE_CONTENT_TYPE_GRAPHICS:
+ frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
+ break;
+ case DRM_MODE_CONTENT_TYPE_CINEMA:
+ frame->content_type = HDMI_CONTENT_TYPE_CINEMA;
+ break;
+ case DRM_MODE_CONTENT_TYPE_GAME:
+ frame->content_type = HDMI_CONTENT_TYPE_GAME;
+ break;
+ case DRM_MODE_CONTENT_TYPE_PHOTO:
+ frame->content_type = HDMI_CONTENT_TYPE_PHOTO;
+ break;
+ default:
+ /* Graphics is the default(0) */
+ frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
+ }
+
+ frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type);
diff --git a/drivers/gpu/drm/display/drm_scdc_helper.c b/drivers/gpu/drm/display/drm_scdc_helper.c
new file mode 100644
index 000000000..c3ad4ab2b
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_scdc_helper.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2015 NVIDIA Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <drm/display/drm_scdc_helper.h>
+#include <drm/drm_print.h>
+
+/**
+ * DOC: scdc helpers
+ *
+ * Status and Control Data Channel (SCDC) is a mechanism introduced by the
+ * HDMI 2.0 specification. It is a point-to-point protocol that allows the
+ * HDMI source and HDMI sink to exchange data. The same I2C interface that
+ * is used to access EDID serves as the transport mechanism for SCDC.
+ *
+ * Note: The SCDC status is going to be lost when the display is
+ * disconnected. This can happen physically when the user disconnects
+ * the cable, but also when a display is switched on (such as waking up
+ * a TV).
+ *
+ * This is further complicated by the fact that, upon a disconnection /
+ * reconnection, KMS won't change the mode on its own. This means that
+ * one can't just rely on setting the SCDC status on enable, but also
+ * has to track the connector status changes using interrupts and
+ * restore the SCDC status. The typical solution for this is to trigger an
+ * empty modeset in drm_connector_helper_funcs.detect_ctx(), like what vc4 does
+ * in vc4_hdmi_reset_link().
+ */
+
+#define SCDC_I2C_SLAVE_ADDRESS 0x54
+
+/**
+ * drm_scdc_read - read a block of data from SCDC
+ * @adapter: I2C controller
+ * @offset: start offset of block to read
+ * @buffer: return location for the block to read
+ * @size: size of the block to read
+ *
+ * Reads a block of data from SCDC, starting at a given offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure.
+ */
+ssize_t drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer,
+ size_t size)
+{
+ int ret;
+ struct i2c_msg msgs[2] = {
+ {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1,
+ .buf = &offset,
+ }, {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = I2C_M_RD,
+ .len = size,
+ .buf = buffer,
+ }
+ };
+
+ ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0)
+ return ret;
+ if (ret != ARRAY_SIZE(msgs))
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_scdc_read);
+
+/**
+ * drm_scdc_write - write a block of data to SCDC
+ * @adapter: I2C controller
+ * @offset: start offset of block to write
+ * @buffer: block of data to write
+ * @size: size of the block to write
+ *
+ * Writes a block of data to SCDC, starting at a given offset.
+ *
+ * Returns:
+ * 0 on success, negative error code on failure.
+ */
+ssize_t drm_scdc_write(struct i2c_adapter *adapter, u8 offset,
+ const void *buffer, size_t size)
+{
+ struct i2c_msg msg = {
+ .addr = SCDC_I2C_SLAVE_ADDRESS,
+ .flags = 0,
+ .len = 1 + size,
+ .buf = NULL,
+ };
+ void *data;
+ int err;
+
+ data = kmalloc(1 + size, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ msg.buf = data;
+
+ memcpy(data, &offset, sizeof(offset));
+ memcpy(data + 1, buffer, size);
+
+ err = i2c_transfer(adapter, &msg, 1);
+
+ kfree(data);
+
+ if (err < 0)
+ return err;
+ if (err != 1)
+ return -EPROTO;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_scdc_write);
+
+/**
+ * drm_scdc_get_scrambling_status - what is status of scrambling?
+ * @adapter: I2C adapter for DDC channel
+ *
+ * Reads the scrambler status over SCDC, and checks the
+ * scrambling status.
+ *
+ * Returns:
+ * True if the scrambling is enabled, false otherwise.
+ */
+bool drm_scdc_get_scrambling_status(struct i2c_adapter *adapter)
+{
+ u8 status;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_SCRAMBLER_STATUS, &status);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Failed to read scrambling status: %d\n", ret);
+ return false;
+ }
+
+ return status & SCDC_SCRAMBLING_STATUS;
+}
+EXPORT_SYMBOL(drm_scdc_get_scrambling_status);
+
+/**
+ * drm_scdc_set_scrambling - enable scrambling
+ * @adapter: I2C adapter for DDC channel
+ * @enable: bool to indicate if scrambling is to be enabled/disabled
+ *
+ * Writes the TMDS config register over SCDC channel, and:
+ * enables scrambling when enable = 1
+ * disables scrambling when enable = 0
+ *
+ * Returns:
+ * True if scrambling is set/reset successfully, false otherwise.
+ */
+bool drm_scdc_set_scrambling(struct i2c_adapter *adapter, bool enable)
+{
+ u8 config;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Failed to read TMDS config: %d\n", ret);
+ return false;
+ }
+
+ if (enable)
+ config |= SCDC_SCRAMBLING_ENABLE;
+ else
+ config &= ~SCDC_SCRAMBLING_ENABLE;
+
+ ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Failed to enable scrambling: %d\n", ret);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(drm_scdc_set_scrambling);
+
+/**
+ * drm_scdc_set_high_tmds_clock_ratio - set TMDS clock ratio
+ * @adapter: I2C adapter for DDC channel
+ * @set: ret or reset the high clock ratio
+ *
+ *
+ * TMDS clock ratio calculations go like this:
+ * TMDS character = 10 bit TMDS encoded value
+ *
+ * TMDS character rate = The rate at which TMDS characters are
+ * transmitted (Mcsc)
+ *
+ * TMDS bit rate = 10x TMDS character rate
+ *
+ * As per the spec:
+ * TMDS clock rate for pixel clock < 340 MHz = 1x the character
+ * rate = 1/10 pixel clock rate
+ *
+ * TMDS clock rate for pixel clock > 340 MHz = 0.25x the character
+ * rate = 1/40 pixel clock rate
+ *
+ * Writes to the TMDS config register over SCDC channel, and:
+ * sets TMDS clock ratio to 1/40 when set = 1
+ *
+ * sets TMDS clock ratio to 1/10 when set = 0
+ *
+ * Returns:
+ * True if write is successful, false otherwise.
+ */
+bool drm_scdc_set_high_tmds_clock_ratio(struct i2c_adapter *adapter, bool set)
+{
+ u8 config;
+ int ret;
+
+ ret = drm_scdc_readb(adapter, SCDC_TMDS_CONFIG, &config);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Failed to read TMDS config: %d\n", ret);
+ return false;
+ }
+
+ if (set)
+ config |= SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
+ else
+ config &= ~SCDC_TMDS_BIT_CLOCK_RATIO_BY_40;
+
+ ret = drm_scdc_writeb(adapter, SCDC_TMDS_CONFIG, config);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Failed to set TMDS clock ratio: %d\n", ret);
+ return false;
+ }
+
+ /*
+ * The spec says that a source should wait minimum 1ms and maximum
+ * 100ms after writing the TMDS config for clock ratio. Lets allow a
+ * wait of up to 2ms here.
+ */
+ usleep_range(1000, 2000);
+ return true;
+}
+EXPORT_SYMBOL(drm_scdc_set_high_tmds_clock_ratio);