diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
index ec0c4932f15c..c9461de06cd0 100644
--- a/drivers/gpu/drm/sun4i/sunxi_engine.h
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -114,7 +114,7 @@ struct sunxi_engine_ops {
 	void (*vblank_quirk)(struct sunxi_engine *engine);
 
 	/**
-	 * @mode_set
+	 * @mode_set:
 	 *
 	 * This callback is used to set mode related parameters
 	 * like interlacing, screen size, etc. once per mode set.
@@ -131,6 +131,7 @@ struct sunxi_engine_ops {
  * @node:	the of device node of the engine
  * @regs:	the regmap of the engine
  * @id:		the id of the engine (-1 if not used)
+ * @list:	engine list management
  */
 struct sunxi_engine {
 	const struct sunxi_engine_ops	*ops;
@@ -140,7 +141,6 @@ struct sunxi_engine {
 
 	int id;
 
-	/* Engine list management */
 	struct list_head		list;
 };
 
@@ -163,6 +163,9 @@ sunxi_engine_commit(struct sunxi_engine *engine,
  * sunxi_engine_layers_init() - Create planes (layers) for the engine
  * @drm:	pointer to the drm_device for which planes will be created
  * @engine:	pointer to the engine
+ *
+ * Returns: The array of struct drm_plane backing the layers, or an
+ *		error pointer on failure.
  */
 static inline struct drm_plane **
 sunxi_engine_layers_init(struct drm_device *drm, struct sunxi_engine *engine)