drm/panel: support drm_find_panel_by_connector

Change-Id: Iee970e013ff8b1558a060f334c700dea36c38d0f
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>

Author: Mark Yao

drivers/gpu/drm/drm_panel.c

@@ -75,6 +75,24 @@ int drm_panel_detach(struct drm_panel *panel)
 }
 EXPORT_SYMBOL(drm_panel_detach);
 
+struct drm_panel *drm_find_panel_by_connector(struct drm_connector *connector)
+{
+	struct drm_panel *panel;
+
+	mutex_lock(&panel_lock);
+
+	list_for_each_entry(panel, &panel_list, list) {
+		if (panel->connector == connector) {
+			mutex_unlock(&panel_lock);
+			return panel;
+		}
+	}
+
+	mutex_unlock(&panel_lock);
+	return NULL;
+}
+EXPORT_SYMBOL(drm_find_panel_by_connector);
+
 #ifdef CONFIG_OF
 struct drm_panel *of_drm_find_panel(struct device_node *np)
 {

include/drm/drm_panel.h

@@ -143,6 +143,7 @@ void drm_panel_remove(struct drm_panel *panel);
 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
 int drm_panel_detach(struct drm_panel *panel);
 
+struct drm_panel *drm_find_panel_by_connector(struct drm_connector *connector);
 #ifdef CONFIG_OF
 struct drm_panel *of_drm_find_panel(struct device_node *np);
 #else