From b22da3d8526a935aa31e086e63f60ff3246cb61c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 07:24:11 +0000
Subject: [PATCH] add stmac read mac form eeprom
---
kernel/drivers/gpu/drm/drm_panel.c | 277 +++++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 215 insertions(+), 62 deletions(-)
diff --git a/kernel/drivers/gpu/drm/drm_panel.c b/kernel/drivers/gpu/drm/drm_panel.c
index d37b83f..f634371 100644
--- a/kernel/drivers/gpu/drm/drm_panel.c
+++ b/kernel/drivers/gpu/drm/drm_panel.c
@@ -21,11 +21,13 @@
* DEALINGS IN THE SOFTWARE.
*/
+#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/module.h>
#include <drm/drm_crtc.h>
#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
static DEFINE_MUTEX(panel_lock);
static LIST_HEAD(panel_list);
@@ -36,19 +38,29 @@
* The DRM panel helpers allow drivers to register panel objects with a
* central registry and provide functions to retrieve those panels in display
* drivers.
+ *
+ * For easy integration into drivers using the &drm_bridge infrastructure please
+ * take look at drm_panel_bridge_add() and devm_drm_panel_bridge_add().
*/
/**
* drm_panel_init - initialize a panel
* @panel: DRM panel
+ * @dev: parent device of the panel
+ * @funcs: panel operations
+ * @connector_type: the connector type (DRM_MODE_CONNECTOR_*) corresponding to
+ * the panel interface
*
- * Sets up internal fields of the panel so that it can subsequently be added
- * to the registry.
+ * Initialize the panel structure for subsequent registration with
+ * drm_panel_add().
*/
-void drm_panel_init(struct drm_panel *panel)
+void drm_panel_init(struct drm_panel *panel, struct device *dev,
+ const struct drm_panel_funcs *funcs, int connector_type)
{
INIT_LIST_HEAD(&panel->list);
- BLOCKING_INIT_NOTIFIER_HEAD(&panel->nh);
+ panel->dev = dev;
+ panel->funcs = funcs;
+ panel->connector_type = connector_type;
}
EXPORT_SYMBOL(drm_panel_init);
@@ -58,16 +70,12 @@
*
* Add a panel to the global registry so that it can be looked up by display
* drivers.
- *
- * Return: 0 on success or a negative error code on failure.
*/
-int drm_panel_add(struct drm_panel *panel)
+void drm_panel_add(struct drm_panel *panel)
{
mutex_lock(&panel_lock);
list_add_tail(&panel->list, &panel_list);
mutex_unlock(&panel_lock);
-
- return 0;
}
EXPORT_SYMBOL(drm_panel_add);
@@ -86,52 +94,134 @@
EXPORT_SYMBOL(drm_panel_remove);
/**
- * drm_panel_attach - attach a panel to a connector
+ * drm_panel_prepare - power on a panel
+ * @panel: DRM panel
+ *
+ * Calling this function will enable power and deassert any reset signals to
+ * the panel. After this has completed it is possible to communicate with any
+ * integrated circuitry via a command bus.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_prepare(struct drm_panel *panel)
+{
+ if (!panel)
+ return -EINVAL;
+
+ if (panel->funcs && panel->funcs->prepare)
+ return panel->funcs->prepare(panel);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_panel_prepare);
+
+/**
+ * drm_panel_unprepare - power off a panel
+ * @panel: DRM panel
+ *
+ * Calling this function will completely power off a panel (assert the panel's
+ * reset, turn off power supplies, ...). After this function has completed, it
+ * is usually no longer possible to communicate with the panel until another
+ * call to drm_panel_prepare().
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_unprepare(struct drm_panel *panel)
+{
+ if (!panel)
+ return -EINVAL;
+
+ if (panel->funcs && panel->funcs->unprepare)
+ return panel->funcs->unprepare(panel);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_panel_unprepare);
+
+/**
+ * drm_panel_enable - enable a panel
+ * @panel: DRM panel
+ *
+ * Calling this function will cause the panel display drivers to be turned on
+ * and the backlight to be enabled. Content will be visible on screen after
+ * this call completes.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_enable(struct drm_panel *panel)
+{
+ int ret;
+
+ if (!panel)
+ return -EINVAL;
+
+ if (panel->funcs && panel->funcs->enable) {
+ ret = panel->funcs->enable(panel);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = backlight_enable(panel->backlight);
+ if (ret < 0)
+ DRM_DEV_INFO(panel->dev, "failed to enable backlight: %d\n",
+ ret);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_panel_enable);
+
+/**
+ * drm_panel_disable - disable a panel
+ * @panel: DRM panel
+ *
+ * This will typically turn off the panel's backlight or disable the display
+ * drivers. For smart panels it should still be possible to communicate with
+ * the integrated circuitry via any command bus after this call.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_disable(struct drm_panel *panel)
+{
+ int ret;
+
+ if (!panel)
+ return -EINVAL;
+
+ ret = backlight_disable(panel->backlight);
+ if (ret < 0)
+ DRM_DEV_INFO(panel->dev, "failed to disable backlight: %d\n",
+ ret);
+
+ if (panel->funcs && panel->funcs->disable)
+ return panel->funcs->disable(panel);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_panel_disable);
+
+/**
+ * drm_panel_get_modes - probe the available display modes of a panel
* @panel: DRM panel
* @connector: DRM connector
*
- * After obtaining a pointer to a DRM panel a display driver calls this
- * function to attach a panel to a connector.
+ * The modes probed from the panel are automatically added to the connector
+ * that the panel is attached to.
*
- * An error is returned if the panel is already attached to another connector.
- *
- * When unloading, the driver should detach from the panel by calling
- * drm_panel_detach().
- *
- * Return: 0 on success or a negative error code on failure.
+ * Return: The number of modes available from the panel on success or a
+ * negative error code on failure.
*/
-int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
+int drm_panel_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
{
- if (panel->connector)
- return -EBUSY;
+ if (!panel)
+ return -EINVAL;
- panel->connector = connector;
- panel->drm = connector->dev;
+ if (panel->funcs && panel->funcs->get_modes)
+ return panel->funcs->get_modes(panel, connector);
- return 0;
+ return -EOPNOTSUPP;
}
-EXPORT_SYMBOL(drm_panel_attach);
-
-/**
- * drm_panel_detach - detach a panel from a connector
- * @panel: DRM panel
- *
- * Detaches a panel from the connector it is attached to. If a panel is not
- * attached to any connector this is effectively a no-op.
- *
- * This function should not be called by the panel device itself. It
- * is only for the drm device that called drm_panel_attach().
- *
- * Return: 0 on success or a negative error code on failure.
- */
-int drm_panel_detach(struct drm_panel *panel)
-{
- panel->connector = NULL;
- panel->drm = NULL;
-
- return 0;
-}
-EXPORT_SYMBOL(drm_panel_detach);
+EXPORT_SYMBOL(drm_panel_get_modes);
#ifdef CONFIG_OF
/**
@@ -143,7 +233,9 @@
*
* Return: A pointer to the panel registered for the specified device tree
* node or an ERR_PTR() if no panel matching the device tree node can be found.
+ *
* Possible error codes returned by this function:
+ *
* - EPROBE_DEFER: the panel device has not been probed yet, and the caller
* should retry later
* - ENODEV: the device is not available (status != "okay" or "ok")
@@ -168,28 +260,89 @@
return ERR_PTR(-EPROBE_DEFER);
}
EXPORT_SYMBOL(of_drm_find_panel);
+
+/**
+ * of_drm_get_panel_orientation - look up the orientation of the panel through
+ * the "rotation" binding from a device tree node
+ * @np: device tree node of the panel
+ * @orientation: orientation enum to be filled in
+ *
+ * Looks up the rotation of a panel in the device tree. The orientation of the
+ * panel is expressed as a property name "rotation" in the device tree. The
+ * rotation in the device tree is counter clockwise.
+ *
+ * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
+ * rotation property doesn't exist. Return a negative error code on failure.
+ */
+int of_drm_get_panel_orientation(const struct device_node *np,
+ enum drm_panel_orientation *orientation)
+{
+ int rotation, ret;
+
+ ret = of_property_read_u32(np, "rotation", &rotation);
+ if (ret == -EINVAL) {
+ /* Don't return an error if there's no rotation property. */
+ *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+ return 0;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ if (rotation == 0)
+ *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
+ else if (rotation == 90)
+ *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
+ else if (rotation == 180)
+ *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
+ else if (rotation == 270)
+ *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL(of_drm_get_panel_orientation);
#endif
-int drm_panel_notifier_register(struct drm_panel *panel,
- struct notifier_block *nb)
+#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)
+/**
+ * drm_panel_of_backlight - use backlight device node for backlight
+ * @panel: DRM panel
+ *
+ * Use this function to enable backlight handling if your panel
+ * uses device tree and has a backlight phandle.
+ *
+ * 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 device tree
+ * will call this function at probe time. Backlight will then be handled
+ * transparently without requiring any intervention from the driver.
+ * drm_panel_of_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_of_backlight(struct drm_panel *panel)
{
- return blocking_notifier_chain_register(&panel->nh, nb);
-}
-EXPORT_SYMBOL_GPL(drm_panel_notifier_register);
+ struct backlight_device *backlight;
-int drm_panel_notifier_unregister(struct drm_panel *panel,
- struct notifier_block *nb)
-{
- return blocking_notifier_chain_unregister(&panel->nh, nb);
-}
-EXPORT_SYMBOL_GPL(drm_panel_notifier_unregister);
+ if (!panel || !panel->dev)
+ return -EINVAL;
-int drm_panel_notifier_call_chain(struct drm_panel *panel,
- unsigned long val, void *v)
-{
- return blocking_notifier_call_chain(&panel->nh, val, v);
+ backlight = devm_of_find_backlight(panel->dev);
+
+ if (IS_ERR(backlight))
+ return PTR_ERR(backlight);
+
+ panel->backlight = backlight;
+ return 0;
}
-EXPORT_SYMBOL_GPL(drm_panel_notifier_call_chain);
+EXPORT_SYMBOL(drm_panel_of_backlight);
+#endif
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("DRM panel infrastructure");
--
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