@@ -349,9 +349,11 @@ struct drm_bridge_funcs {
* Duplicate the current bridge state object (which is guaranteed to be
* non-NULL).
*
- * The atomic_duplicate_state() hook is optional. When not implemented
- * the core allocates a drm_bridge_state object and calls
- * __drm_atomic_helper_bridge_duplicate_state() to initialize it.
+ * The atomic_duplicate_state hook is mandatory if the bridge
+ * implements any of the atomic hooks, and should be left unassigned
+ * otherwise. For bridges that don't subclass &drm_bridge_state, the
+ * drm_atomic_helper_bridge_duplicate_state() helper function shall be
+ * used to implement this hook.
*
* RETURNS:
* A valid drm_bridge_state object or NULL if the allocation fails.
@@ -364,8 +366,11 @@ struct drm_bridge_funcs {
* Destroy a bridge state object previously allocated by
* &drm_bridge_funcs.atomic_duplicate_state().
*
- * The atomic_destroy_state hook is optional. When not implemented the
- * core calls kfree() on the state.
+ * The atomic_destroy_state hook is mandatory if the bridge implements
+ * any of the atomic hooks, and should be left unassigned otherwise.
+ * For bridges that don't subclass &drm_bridge_state, the
+ * drm_atomic_helper_bridge_destroy_state() helper function shall be
+ * used to implement this hook.
*/
void (*atomic_destroy_state)(struct drm_bridge *bridge,
struct drm_bridge_state *state);
@@ -474,7 +479,10 @@ struct drm_bridge_funcs {
* This function is called at attach time.
*
* The atomic_reset hook is mandatory if the bridge implements any of
- * the atomic hooks, and should be left unassigned otherwise.
+ * the atomic hooks, and should be left unassigned otherwise. For
+ * bridges that don't subclass &drm_bridge_state, the
+ * drm_atomic_helper_bridge_reset() helper function shall be used to
+ * implement this hook.
*
* Note that the atomic_reset() semantics is not exactly matching the
* reset() semantics found on other components (connector, plane, ...).