drm/encoder: add functionality to register encoders to a global list
From: Heiko Stuebner <heiko@...> Date: Mon, 26 Jan 2015 23:32:25 +0100
Commit-Message
This allows standalone encoders to be registered and found again through their devicetree node when going through their connection graph. Setting the of_node property is of course still optional, as it is not necessary in most cases to lookup encoders that are part of a bigger component. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
drivers/gpu/drm/drm_crtc.c | 41 +++++++++++++++++++++++++++++++++++++++++ include/drm/drm_crtc.h | 8 ++++++++ 2 files changed, 49 insertions(+)
Statistics
- 49 lines added
- 0 lines removed
Changes
-------------------------- drivers/gpu/drm/drm_crtc.c --------------------------
index f6d04c7..b63e69d 100644
@@ -1066,6 +1066,47 @@ void drm_connector_unplug_all(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_connector_unplug_all);
+static DEFINE_MUTEX(encoder_lock);
+static LIST_HEAD(encoder_list);
+
+int drm_encoder_add(struct drm_encoder *encoder)
+{
+ mutex_lock(&encoder_lock);
+ list_add_tail(&encoder->list, &encoder_list);
+ mutex_unlock(&encoder_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_encoder_add);
+
+void drm_encoder_remove(struct drm_encoder *encoder)
+{
+ mutex_lock(&encoder_lock);
+ list_del_init(&encoder->list);
+ mutex_unlock(&encoder_lock);
+}
+EXPORT_SYMBOL(drm_encoder_remove);
+
+#ifdef CONFIG_OF
+struct drm_encoder *of_drm_find_encoder(struct device_node *np)
+{
+ struct drm_encoder *encoder;
+
+ mutex_lock(&encoder_lock);
+
+ list_for_each_entry(encoder, &encoder_list, list) {
+ if (encoder->of_node == np) {
+ mutex_unlock(&encoder_lock);
+ return encoder;
+ }
+ }
+
+ mutex_unlock(&encoder_lock);
+ return NULL;
+}
+EXPORT_SYMBOL(of_drm_find_encoder);
+#endif
+
/**
* drm_encoder_init - Init a preallocated encoder
* @dev: drm device
---------------------------- include/drm/drm_crtc.h ----------------------------
index 920e21a..76994ba 100644
@@ -569,6 +569,7 @@ struct drm_encoder_funcs {
/**
* struct drm_encoder - central DRM encoder structure
* @dev: parent DRM device
+ * @of_node: device node pointer to the bridge
* @head: list management
* @base: base KMS object
* @name: encoder name
@@ -585,6 +586,10 @@ struct drm_encoder_funcs {
*/
struct drm_encoder {
struct drm_device *dev;
+#ifdef CONFIG_OF
+ struct device_node *of_node;
+#endif
+ struct list_head list;
struct list_head head;
struct drm_mode_object base;
@@ -1225,6 +1230,9 @@ extern void drm_bridge_remove(struct drm_bridge *bridge);
extern struct drm_bridge *of_drm_find_bridge(struct device_node *np);
extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge);
+extern int drm_encoder_add(struct drm_encoder *encoder);
+extern void drm_encoder_remove(struct drm_encoder *encoder);
+extern struct drm_encoder *of_drm_find_encoder(struct device_node *np);
extern int drm_encoder_init(struct drm_device *dev,
struct drm_encoder *encoder,
const struct drm_encoder_funcs *funcs,