1 files changed, 497 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
new file mode 100644
index 000000000..216af76d0
--- /dev/null
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ * Copyright (C) 2017 Broadcom
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+struct panel_bridge {
+	struct drm_bridge bridge;
+	struct drm_connector connector;
+	struct drm_panel *panel;
+	u32 connector_type;
+};
+
+static inline struct panel_bridge *
+drm_bridge_to_panel_bridge(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct panel_bridge, bridge);
+}
+
+static inline struct panel_bridge *
+drm_connector_to_panel_bridge(struct drm_connector *connector)
+{
+	return container_of(connector, struct panel_bridge, connector);
+}
+
+static int panel_bridge_connector_get_modes(struct drm_connector *connector)
+{
+	struct panel_bridge *panel_bridge =
+		drm_connector_to_panel_bridge(connector);
+
+	return drm_panel_get_modes(panel_bridge->panel, connector);
+}
+
+static const struct drm_connector_helper_funcs
+panel_bridge_connector_helper_funcs = {
+	.get_modes = panel_bridge_connector_get_modes,
+};
+
+static const struct drm_connector_funcs panel_bridge_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int panel_bridge_attach(struct drm_bridge *bridge,
+			       enum drm_bridge_attach_flags flags)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_connector *connector = &panel_bridge->connector;
+	int ret;
+
+	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
+		return 0;
+
+	if (!bridge->encoder) {
+		DRM_ERROR("Missing encoder\n");
+		return -ENODEV;
+	}
+
+	drm_connector_helper_add(connector,
+				 &panel_bridge_connector_helper_funcs);
+
+	ret = drm_connector_init(bridge->dev, connector,
+				 &panel_bridge_connector_funcs,
+				 panel_bridge->connector_type);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector\n");
+		return ret;
+	}
+
+	drm_connector_attach_encoder(&panel_bridge->connector,
+					  bridge->encoder);
+
+	if (bridge->dev->registered) {
+		if (connector->funcs->reset)
+			connector->funcs->reset(connector);
+		drm_connector_register(connector);
+	}
+
+	return 0;
+}
+
+static void panel_bridge_detach(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_connector *connector = &panel_bridge->connector;
+
+	/*
+	 * Cleanup the connector if we know it was initialized.
+	 *
+	 * FIXME: This wouldn't be needed if the panel_bridge structure was
+	 * allocated with drmm_kzalloc(). This might be tricky since the
+	 * drm_device pointer can only be retrieved when the bridge is attached.
+	 */
+	if (connector->dev)
+		drm_connector_cleanup(connector);
+}
+
+static void panel_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	drm_panel_prepare(panel_bridge->panel);
+}
+
+static void panel_bridge_enable(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	drm_panel_enable(panel_bridge->panel);
+}
+
+static void panel_bridge_disable(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	drm_panel_disable(panel_bridge->panel);
+}
+
+static void panel_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	drm_panel_unprepare(panel_bridge->panel);
+}
+
+static int panel_bridge_get_modes(struct drm_bridge *bridge,
+				  struct drm_connector *connector)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	return drm_panel_get_modes(panel_bridge->panel, connector);
+}
+
+static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
+				      struct dentry *root)
+{
+	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_panel *panel = panel_bridge->panel;
+
+	root = debugfs_create_dir("panel", root);
+	if (panel->funcs->debugfs_init)
+		panel->funcs->debugfs_init(panel, root);
+}
+
+static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
+	.attach = panel_bridge_attach,
+	.detach = panel_bridge_detach,
+	.pre_enable = panel_bridge_pre_enable,
+	.enable = panel_bridge_enable,
+	.disable = panel_bridge_disable,
+	.post_disable = panel_bridge_post_disable,
+	.get_modes = panel_bridge_get_modes,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
+	.debugfs_init = panel_bridge_debugfs_init,
+};
+
+/**
+ * drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge.
+ *
+ * @bridge: The drm_bridge to be checked.
+ *
+ * Returns true if the bridge is a panel bridge, or false otherwise.
+ */
+bool drm_bridge_is_panel(const struct drm_bridge *bridge)
+{
+	return bridge->funcs == &panel_bridge_bridge_funcs;
+}
+EXPORT_SYMBOL(drm_bridge_is_panel);
+
+/**
+ * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that
+ * just calls the appropriate functions from &drm_panel.
+ *
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ *
+ * For drivers converting from directly using drm_panel: The expected
+ * usage pattern is that during either encoder module probe or DSI
+ * host attach, a drm_panel will be looked up through
+ * drm_of_find_panel_or_bridge().  drm_panel_bridge_add() is used to
+ * wrap that panel in the new bridge, and the result can then be
+ * passed to drm_bridge_attach().  The drm_panel_prepare() and related
+ * functions can be dropped from the encoder driver (they're now
+ * called by the KMS helpers before calling into the encoder), along
+ * with connector creation.  When done with the bridge (after
+ * drm_mode_config_cleanup() if the bridge has already been attached), then
+ * drm_panel_bridge_remove() to free it.
+ *
+ * The connector type is set to @panel->connector_type, which must be set to a
+ * known type. Calling this function with a panel whose connector type is
+ * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL).
+ *
+ * See devm_drm_panel_bridge_add() for an automatically managed version of this
+ * function.
+ */
+struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel)
+{
+	if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
+		return ERR_PTR(-EINVAL);
+
+	return drm_panel_bridge_add_typed(panel, panel->connector_type);
+}
+EXPORT_SYMBOL(drm_panel_bridge_add);
+
+/**
+ * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with
+ * an explicit connector type.
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ * @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
+ *
+ * This is just like drm_panel_bridge_add(), but forces the connector type to
+ * @connector_type instead of infering it from the panel.
+ *
+ * This function is deprecated and should not be used in new drivers. Use
+ * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they
+ * don't report a connector type.
+ */
+struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
+					      u32 connector_type)
+{
+	struct panel_bridge *panel_bridge;
+
+	if (!panel)
+		return ERR_PTR(-EINVAL);
+
+	panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
+				    GFP_KERNEL);
+	if (!panel_bridge)
+		return ERR_PTR(-ENOMEM);
+
+	panel_bridge->connector_type = connector_type;
+	panel_bridge->panel = panel;
+
+	panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
+#ifdef CONFIG_OF
+	panel_bridge->bridge.of_node = panel->dev->of_node;
+#endif
+	panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
+	panel_bridge->bridge.type = connector_type;
+
+	drm_bridge_add(&panel_bridge->bridge);
+
+	return &panel_bridge->bridge;
+}
+EXPORT_SYMBOL(drm_panel_bridge_add_typed);
+
+/**
+ * drm_panel_bridge_remove - Unregisters and frees a drm_bridge
+ * created by drm_panel_bridge_add().
+ *
+ * @bridge: The drm_bridge being freed.
+ */
+void drm_panel_bridge_remove(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge;
+
+	if (!bridge)
+		return;
+
+	if (bridge->funcs != &panel_bridge_bridge_funcs)
+		return;
+
+	panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	drm_bridge_remove(bridge);
+	devm_kfree(panel_bridge->panel->dev, bridge);
+}
+EXPORT_SYMBOL(drm_panel_bridge_remove);
+
+/**
+ * drm_panel_bridge_set_orientation - Set the connector's panel orientation
+ * from the bridge that can be transformed to panel bridge.
+ *
+ * @connector: The connector to be set panel orientation.
+ * @bridge: The drm_bridge to be transformed to panel bridge.
+ *
+ * Returns 0 on success, negative errno on failure.
+ */
+int drm_panel_bridge_set_orientation(struct drm_connector *connector,
+				     struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge;
+
+	panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	return drm_connector_set_orientation_from_panel(connector,
+							panel_bridge->panel);
+}
+EXPORT_SYMBOL(drm_panel_bridge_set_orientation);
+
+static void devm_drm_panel_bridge_release(struct device *dev, void *res)
+{
+	struct drm_bridge **bridge = res;
+
+	drm_panel_bridge_remove(*bridge);
+}
+
+/**
+ * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector
+ * that just calls the appropriate functions from &drm_panel.
+ * @dev: device to tie the bridge lifetime to
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ *
+ * This is the managed version of drm_panel_bridge_add() which automatically
+ * calls drm_panel_bridge_remove() when @dev is unbound.
+ */
+struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
+					     struct drm_panel *panel)
+{
+	if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
+		return ERR_PTR(-EINVAL);
+
+	return devm_drm_panel_bridge_add_typed(dev, panel,
+					       panel->connector_type);
+}
+EXPORT_SYMBOL(devm_drm_panel_bridge_add);
+
+/**
+ * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and
+ * &drm_connector with an explicit connector type.
+ * @dev: device to tie the bridge lifetime to
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ * @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
+ *
+ * This is just like devm_drm_panel_bridge_add(), but forces the connector type
+ * to @connector_type instead of infering it from the panel.
+ *
+ * This function is deprecated and should not be used in new drivers. Use
+ * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if
+ * they don't report a connector type.
+ */
+struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
+						   struct drm_panel *panel,
+						   u32 connector_type)
+{
+	struct drm_bridge **ptr, *bridge;
+
+	ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
+			   GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	bridge = drm_panel_bridge_add_typed(panel, connector_type);
+	if (!IS_ERR(bridge)) {
+		*ptr = bridge;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return bridge;
+}
+EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
+
+static void drmm_drm_panel_bridge_release(struct drm_device *drm, void *ptr)
+{
+	struct drm_bridge *bridge = ptr;
+
+	drm_panel_bridge_remove(bridge);
+}
+
+/**
+ * drmm_panel_bridge_add - Creates a DRM-managed &drm_bridge and
+ *                         &drm_connector that just calls the
+ *                         appropriate functions from &drm_panel.
+ *
+ * @drm: DRM device to tie the bridge lifetime to
+ * @panel: The drm_panel being wrapped.  Must be non-NULL.
+ *
+ * This is the DRM-managed version of drm_panel_bridge_add() which
+ * automatically calls drm_panel_bridge_remove() when @dev is cleaned
+ * up.
+ */
+struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm,
+					 struct drm_panel *panel)
+{
+	struct drm_bridge *bridge;
+	int ret;
+
+	bridge = drm_panel_bridge_add_typed(panel, panel->connector_type);
+	if (IS_ERR(bridge))
+		return bridge;
+
+	ret = drmm_add_action_or_reset(drm, drmm_drm_panel_bridge_release,
+				       bridge);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return bridge;
+}
+EXPORT_SYMBOL(drmm_panel_bridge_add);
+
+/**
+ * drm_panel_bridge_connector - return the connector for the panel bridge
+ * @bridge: The drm_bridge.
+ *
+ * drm_panel_bridge creates the connector.
+ * This function gives external access to the connector.
+ *
+ * Returns: Pointer to drm_connector
+ */
+struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge;
+
+	panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	return &panel_bridge->connector;
+}
+EXPORT_SYMBOL(drm_panel_bridge_connector);
+
+#ifdef CONFIG_OF
+/**
+ * devm_drm_of_get_bridge - Return next bridge in the chain
+ * @dev: device to tie the bridge lifetime to
+ * @np: device tree node containing encoder output ports
+ * @port: port in the device tree node
+ * @endpoint: endpoint in the device tree node
+ *
+ * Given a DT node's port and endpoint number, finds the connected node
+ * and returns the associated bridge if any, or creates and returns a
+ * drm panel bridge instance if a panel is connected.
+ *
+ * Returns a pointer to the bridge if successful, or an error pointer
+ * otherwise.
+ */
+struct drm_bridge *devm_drm_of_get_bridge(struct device *dev,
+					  struct device_node *np,
+					  u32 port, u32 endpoint)
+{
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(np, port, endpoint,
+					  &panel, &bridge);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (panel)
+		bridge = devm_drm_panel_bridge_add(dev, panel);
+
+	return bridge;
+}
+EXPORT_SYMBOL(devm_drm_of_get_bridge);
+
+/**
+ * drmm_of_get_bridge - Return next bridge in the chain
+ * @drm: device to tie the bridge lifetime to
+ * @np: device tree node containing encoder output ports
+ * @port: port in the device tree node
+ * @endpoint: endpoint in the device tree node
+ *
+ * Given a DT node's port and endpoint number, finds the connected node
+ * and returns the associated bridge if any, or creates and returns a
+ * drm panel bridge instance if a panel is connected.
+ *
+ * Returns a drmm managed pointer to the bridge if successful, or an error
+ * pointer otherwise.
+ */
+struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
+				      struct device_node *np,
+				      u32 port, u32 endpoint)
+{
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(np, port, endpoint,
+					  &panel, &bridge);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (panel)
+		bridge = drmm_panel_bridge_add(drm, panel);
+
+	return bridge;
+}
+EXPORT_SYMBOL(drmm_of_get_bridge);
+
+#endif