video: Track whether a display is in use
Mark a display as in use when display_enable() is called. This can avoid
a display being used by multiple video-output devices.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/display.h b/include/display.h
index b1c4766..d0a08d4 100644
--- a/include/display.h
+++ b/include/display.h
@@ -16,10 +16,12 @@
* @source_id: ID for the source of the display data, typically a video
* controller
* @src_dev: Source device providing the video
+ * @in_use: Display is being used
*/
struct display_plat {
int source_id;
struct udevice *src_dev;
+ bool in_use;
};
/**
@@ -41,6 +43,14 @@
int display_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing);
+/**
+ * display_in_use() - Check if a display is in use by any device
+ *
+ * @return true if the device is in use (display_enable() has been called
+ * successfully), else false
+ */
+bool display_in_use(struct udevice *dev);
+
struct dm_display_ops {
/**
* read_timing() - Read information directly