video: Introduce video_sync operation
Some drivers like LCD connected via SPI requires explicit sync function
which copy framebuffer content over SPI to controller to display.
This hook doesn't exist yet that's why introduce it via video operations.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/video.h b/include/video.h
index 1bfe684..12fc525 100644
--- a/include/video.h
+++ b/include/video.h
@@ -114,8 +114,16 @@
u8 bg_col_idx;
};
-/* Placeholder - there are no video operations at present */
+/**
+ * struct video_ops - structure for keeping video operations
+ * @video_sync: Synchronize FB with device. Some device like SPI based LCD
+ * displays needs synchronization when data in an FB is available.
+ * For these devices implement video_sync hook to call a sync
+ * function. vid is pointer to video device udevice. Function
+ * should return 0 on success video_sync and error code otherwise
+ */
struct video_ops {
+ int (*video_sync)(struct udevice *vid);
};
#define video_get_ops(dev) ((struct video_ops *)(dev)->driver->ops)
@@ -155,7 +163,7 @@
* @force: True to force a sync even if there was one recently (this is
* very expensive on sandbox)
*
- * @return: 0 always
+ * @return: 0 on success, error code otherwise
*
* Some frame buffers are cached or have a secondary frame buffer. This
* function syncs these up so that the current contents of the U-Boot frame