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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/bridge/parade-ps8622.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/bridge/parade-ps8622.c')
-rw-r--r--drivers/gpu/drm/bridge/parade-ps8622.c551
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
new file mode 100644
index 0000000000..ae3ab9262e
--- /dev/null
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -0,0 +1,551 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Parade PS8622 eDP/LVDS bridge driver
+ *
+ * Copyright (C) 2014 Google, Inc.
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+/* Brightness scale on the Parade chip */
+#define PS8622_MAX_BRIGHTNESS 0xff
+
+/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
+#define PS8622_POWER_RISE_T1_MIN_US 10
+#define PS8622_POWER_RISE_T1_MAX_US 10000
+#define PS8622_RST_HIGH_T2_MIN_US 3000
+#define PS8622_RST_HIGH_T2_MAX_US 30000
+#define PS8622_PWMO_END_T12_MS 200
+#define PS8622_POWER_FALL_T16_MAX_US 10000
+#define PS8622_POWER_OFF_T17_MS 500
+
+#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
+ (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
+#error "T2.min + T1.max must be less than T2.max + T1.min"
+#endif
+
+struct ps8622_bridge {
+ struct i2c_client *client;
+ struct drm_bridge bridge;
+ struct drm_bridge *panel_bridge;
+ struct regulator *v12;
+ struct backlight_device *bl;
+
+ struct gpio_desc *gpio_slp;
+ struct gpio_desc *gpio_rst;
+
+ u32 max_lane_count;
+ u32 lane_count;
+
+ bool enabled;
+};
+
+static inline struct ps8622_bridge *
+ bridge_to_ps8622(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct ps8622_bridge, bridge);
+}
+
+static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
+{
+ int ret;
+ struct i2c_adapter *adap = client->adapter;
+ struct i2c_msg msg;
+ u8 data[] = {reg, val};
+
+ msg.addr = client->addr + page;
+ msg.flags = 0;
+ msg.len = sizeof(data);
+ msg.buf = data;
+
+ ret = i2c_transfer(adap, &msg, 1);
+ if (ret != 1)
+ pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
+ client->addr + page, reg, val, ret);
+ return !(ret == 1);
+}
+
+static int ps8622_send_config(struct ps8622_bridge *ps8622)
+{
+ struct i2c_client *cl = ps8622->client;
+ int err = 0;
+
+ /* HPD low */
+ err = ps8622_set(cl, 0x02, 0xa1, 0x01);
+ if (err)
+ goto error;
+
+ /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
+ err = ps8622_set(cl, 0x04, 0x14, 0x01);
+ if (err)
+ goto error;
+
+ /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
+ err = ps8622_set(cl, 0x04, 0xe3, 0x20);
+ if (err)
+ goto error;
+
+ /* [7] RCO SS enable */
+ err = ps8622_set(cl, 0x04, 0xe2, 0x80);
+ if (err)
+ goto error;
+
+ /* RPHY Setting
+ * [3:2] CDR tune wait cycle before measure for fine tune
+ * b00: 1us b01: 0.5us b10:2us, b11: 4us
+ */
+ err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
+ if (err)
+ goto error;
+
+ /* [3] RFD always on */
+ err = ps8622_set(cl, 0x04, 0x89, 0x08);
+ if (err)
+ goto error;
+
+ /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
+ err = ps8622_set(cl, 0x04, 0x71, 0x2d);
+ if (err)
+ goto error;
+
+ /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
+ err = ps8622_set(cl, 0x04, 0x7d, 0x07);
+ if (err)
+ goto error;
+
+ /* [1:0] Fmin=+4bands */
+ err = ps8622_set(cl, 0x04, 0x7b, 0x00);
+ if (err)
+ goto error;
+
+ /* [7:5] DCO_FTRNG=+-40% */
+ err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
+ if (err)
+ goto error;
+
+ /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
+ err = ps8622_set(cl, 0x04, 0xc0, 0x12);
+ if (err)
+ goto error;
+
+ /* Gitune=-37% */
+ err = ps8622_set(cl, 0x04, 0xc1, 0x92);
+ if (err)
+ goto error;
+
+ /* Fbstep=100% */
+ err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
+ if (err)
+ goto error;
+
+ /* [7] LOS signal disable */
+ err = ps8622_set(cl, 0x04, 0x32, 0x80);
+ if (err)
+ goto error;
+
+ /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
+ err = ps8622_set(cl, 0x04, 0x00, 0xb0);
+ if (err)
+ goto error;
+
+ /* [7:6] Right-bar GPIO output strength is 8mA */
+ err = ps8622_set(cl, 0x04, 0x15, 0x40);
+ if (err)
+ goto error;
+
+ /* EQ Training State Machine Setting, RCO calibration start */
+ err = ps8622_set(cl, 0x04, 0x54, 0x10);
+ if (err)
+ goto error;
+
+ /* Logic, needs more than 10 I2C command */
+ /* [4:0] MAX_LANE_COUNT set to max supported lanes */
+ err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);
+ if (err)
+ goto error;
+
+ /* [4:0] LANE_COUNT_SET set to chosen lane count */
+ err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);
+ if (err)
+ goto error;
+
+ err = ps8622_set(cl, 0x00, 0x52, 0x20);
+ if (err)
+ goto error;
+
+ /* HPD CP toggle enable */
+ err = ps8622_set(cl, 0x00, 0xf1, 0x03);
+ if (err)
+ goto error;
+
+ err = ps8622_set(cl, 0x00, 0x62, 0x41);
+ if (err)
+ goto error;
+
+ /* Counter number, add 1ms counter delay */
+ err = ps8622_set(cl, 0x00, 0xf6, 0x01);
+ if (err)
+ goto error;
+
+ /* [6]PWM function control by DPCD0040f[7], default is PWM block */
+ err = ps8622_set(cl, 0x00, 0x77, 0x06);
+ if (err)
+ goto error;
+
+ /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
+ err = ps8622_set(cl, 0x00, 0x4c, 0x04);
+ if (err)
+ goto error;
+
+ /* DPCD00400='h00, Parade OUI ='h001cf8 */
+ err = ps8622_set(cl, 0x01, 0xc0, 0x00);
+ if (err)
+ goto error;
+
+ /* DPCD00401='h1c */
+ err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
+ if (err)
+ goto error;
+
+ /* DPCD00402='hf8 */
+ err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
+ if (err)
+ goto error;
+
+ /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
+ err = ps8622_set(cl, 0x01, 0xc3, 0x44);
+ if (err)
+ goto error;
+
+ /* DPCD404 */
+ err = ps8622_set(cl, 0x01, 0xc4, 0x32);
+ if (err)
+ goto error;
+
+ /* DPCD405 */
+ err = ps8622_set(cl, 0x01, 0xc5, 0x53);
+ if (err)
+ goto error;
+
+ /* DPCD406 */
+ err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
+ if (err)
+ goto error;
+
+ /* DPCD407 */
+ err = ps8622_set(cl, 0x01, 0xc7, 0x56);
+ if (err)
+ goto error;
+
+ /* DPCD408 */
+ err = ps8622_set(cl, 0x01, 0xc8, 0x35);
+ if (err)
+ goto error;
+
+ /* DPCD40A, Initial Code major revision '01' */
+ err = ps8622_set(cl, 0x01, 0xca, 0x01);
+ if (err)
+ goto error;
+
+ /* DPCD40B, Initial Code minor revision '05' */
+ err = ps8622_set(cl, 0x01, 0xcb, 0x05);
+ if (err)
+ goto error;
+
+
+ if (ps8622->bl) {
+ /* DPCD720, internal PWM */
+ err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
+ if (err)
+ goto error;
+
+ /* FFh for 100% brightness, 0h for 0% brightness */
+ err = ps8622_set(cl, 0x01, 0xa7,
+ ps8622->bl->props.brightness);
+ if (err)
+ goto error;
+ } else {
+ /* DPCD720, external PWM */
+ err = ps8622_set(cl, 0x01, 0xa5, 0x80);
+ if (err)
+ goto error;
+ }
+
+ /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
+ err = ps8622_set(cl, 0x01, 0xcc, 0x13);
+ if (err)
+ goto error;
+
+ /* Enable SSC set by register */
+ err = ps8622_set(cl, 0x02, 0xb1, 0x20);
+ if (err)
+ goto error;
+
+ /* Set SSC enabled and +/-1% central spreading */
+ err = ps8622_set(cl, 0x04, 0x10, 0x16);
+ if (err)
+ goto error;
+
+ /* Logic end */
+ /* MPU Clock source: LC => RCO */
+ err = ps8622_set(cl, 0x04, 0x59, 0x60);
+ if (err)
+ goto error;
+
+ /* LC -> RCO */
+ err = ps8622_set(cl, 0x04, 0x54, 0x14);
+ if (err)
+ goto error;
+
+ /* HPD high */
+ err = ps8622_set(cl, 0x02, 0xa1, 0x91);
+
+error:
+ return err ? -EIO : 0;
+}
+
+static int ps8622_backlight_update(struct backlight_device *bl)
+{
+ struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
+ int ret, brightness = backlight_get_brightness(bl);
+
+ if (!ps8622->enabled)
+ return -EINVAL;
+
+ ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
+
+ return ret;
+}
+
+static const struct backlight_ops ps8622_backlight_ops = {
+ .update_status = ps8622_backlight_update,
+};
+
+static void ps8622_pre_enable(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
+ int ret;
+
+ if (ps8622->enabled)
+ return;
+
+ gpiod_set_value(ps8622->gpio_rst, 0);
+
+ if (ps8622->v12) {
+ ret = regulator_enable(ps8622->v12);
+ if (ret)
+ DRM_ERROR("fails to enable ps8622->v12");
+ }
+
+ gpiod_set_value(ps8622->gpio_slp, 1);
+
+ /*
+ * T1 is the range of time that it takes for the power to rise after we
+ * enable the lcd/ps8622 fet. T2 is the range of time in which the
+ * data sheet specifies we should deassert the reset pin.
+ *
+ * If it takes T1.max for the power to rise, we need to wait atleast
+ * T2.min before deasserting the reset pin. If it takes T1.min for the
+ * power to rise, we need to wait at most T2.max before deasserting the
+ * reset pin.
+ */
+ usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
+ PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
+
+ gpiod_set_value(ps8622->gpio_rst, 1);
+
+ /* wait 20ms after RST high */
+ usleep_range(20000, 30000);
+
+ ret = ps8622_send_config(ps8622);
+ if (ret) {
+ DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
+ return;
+ }
+
+ ps8622->enabled = true;
+}
+
+static void ps8622_disable(struct drm_bridge *bridge)
+{
+ /* Delay after panel is disabled */
+ msleep(PS8622_PWMO_END_T12_MS);
+}
+
+static void ps8622_post_disable(struct drm_bridge *bridge)
+{
+ struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
+
+ if (!ps8622->enabled)
+ return;
+
+ ps8622->enabled = false;
+
+ /*
+ * This doesn't matter if the regulators are turned off, but something
+ * else might keep them on. In that case, we want to assert the slp gpio
+ * to lower power.
+ */
+ gpiod_set_value(ps8622->gpio_slp, 0);
+
+ if (ps8622->v12)
+ regulator_disable(ps8622->v12);
+
+ /*
+ * Sleep for at least the amount of time that it takes the power rail to
+ * fall to prevent asserting the rst gpio from doing anything.
+ */
+ usleep_range(PS8622_POWER_FALL_T16_MAX_US,
+ 2 * PS8622_POWER_FALL_T16_MAX_US);
+ gpiod_set_value(ps8622->gpio_rst, 0);
+
+ msleep(PS8622_POWER_OFF_T17_MS);
+}
+
+static int ps8622_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
+
+ return drm_bridge_attach(ps8622->bridge.encoder, ps8622->panel_bridge,
+ &ps8622->bridge, flags);
+}
+
+static const struct drm_bridge_funcs ps8622_bridge_funcs = {
+ .pre_enable = ps8622_pre_enable,
+ .disable = ps8622_disable,
+ .post_disable = ps8622_post_disable,
+ .attach = ps8622_attach,
+};
+
+static const struct of_device_id ps8622_devices[] = {
+ {.compatible = "parade,ps8622",},
+ {.compatible = "parade,ps8625",},
+ {}
+};
+MODULE_DEVICE_TABLE(of, ps8622_devices);
+
+static int ps8622_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ struct device *dev = &client->dev;
+ struct ps8622_bridge *ps8622;
+ struct drm_bridge *panel_bridge;
+ int ret;
+
+ ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
+ if (!ps8622)
+ return -ENOMEM;
+
+ panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
+ if (IS_ERR(panel_bridge))
+ return PTR_ERR(panel_bridge);
+
+ ps8622->panel_bridge = panel_bridge;
+ ps8622->client = client;
+
+ ps8622->v12 = devm_regulator_get(dev, "vdd12");
+ if (IS_ERR(ps8622->v12)) {
+ dev_info(dev, "no 1.2v regulator found for PS8622\n");
+ ps8622->v12 = NULL;
+ }
+
+ ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
+ if (IS_ERR(ps8622->gpio_slp)) {
+ ret = PTR_ERR(ps8622->gpio_slp);
+ dev_err(dev, "cannot get gpio_slp %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Assert the reset pin high to avoid the bridge being
+ * initialized prematurely
+ */
+ ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ps8622->gpio_rst)) {
+ ret = PTR_ERR(ps8622->gpio_rst);
+ dev_err(dev, "cannot get gpio_rst %d\n", ret);
+ return ret;
+ }
+
+ ps8622->max_lane_count = id->driver_data;
+
+ if (of_property_read_u32(dev->of_node, "lane-count",
+ &ps8622->lane_count)) {
+ ps8622->lane_count = ps8622->max_lane_count;
+ } else if (ps8622->lane_count > ps8622->max_lane_count) {
+ dev_info(dev, "lane-count property is too high,"
+ "using max_lane_count\n");
+ ps8622->lane_count = ps8622->max_lane_count;
+ }
+
+ if (!of_property_read_bool(dev->of_node, "use-external-pwm")) {
+ ps8622->bl = backlight_device_register("ps8622-backlight",
+ dev, ps8622, &ps8622_backlight_ops,
+ NULL);
+ if (IS_ERR(ps8622->bl)) {
+ DRM_ERROR("failed to register backlight\n");
+ ret = PTR_ERR(ps8622->bl);
+ ps8622->bl = NULL;
+ return ret;
+ }
+ ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
+ ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
+ }
+
+ ps8622->bridge.funcs = &ps8622_bridge_funcs;
+ ps8622->bridge.type = DRM_MODE_CONNECTOR_LVDS;
+ ps8622->bridge.of_node = dev->of_node;
+ drm_bridge_add(&ps8622->bridge);
+
+ i2c_set_clientdata(client, ps8622);
+
+ return 0;
+}
+
+static void ps8622_remove(struct i2c_client *client)
+{
+ struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
+
+ backlight_device_unregister(ps8622->bl);
+ drm_bridge_remove(&ps8622->bridge);
+}
+
+static const struct i2c_device_id ps8622_i2c_table[] = {
+ /* Device type, max_lane_count */
+ {"ps8622", 1},
+ {"ps8625", 2},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
+
+static struct i2c_driver ps8622_driver = {
+ .id_table = ps8622_i2c_table,
+ .probe = ps8622_probe,
+ .remove = ps8622_remove,
+ .driver = {
+ .name = "ps8622",
+ .of_match_table = ps8622_devices,
+ },
+};
+module_i2c_driver(ps8622_driver);
+
+MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
+MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
+MODULE_LICENSE("GPL v2");