drm: Add checks for atomic_[duplicate/destroy]_state with atomic drivers

This patch add checks for atomic_[duplicate/destroy]_state of
drm_[connector/crtc/plane]_funcs for atomic drivers in the relevant
drm_*_init functions since these callback are mandatory for atomic drivers.

Update the kerneldoc comments for those callbacks.

Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180525012555.GA8448@haneen-vb

1 files changed, 4 insertions, 0 deletions

diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 14b1607aba4b..7d4d6c7f0afd 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -288,6 +288,8 @@ struct drm_plane_funcs {
 	 * cleaned up by calling the @atomic_destroy_state hook in this
 	 * structure.
 	 *
+	 * This callback is mandatory for atomic drivers.
+	 *
 	 * Atomic drivers which don't subclass &struct drm_plane_state should use
 	 * drm_atomic_helper_plane_duplicate_state(). Drivers that subclass the
 	 * state structure to extend it with driver-private state should use
@@ -314,6 +316,8 @@ struct drm_plane_funcs {
 	 *
 	 * Destroy a state duplicated with @atomic_duplicate_state and release
 	 * or unreference all resources it references
+	 *
+	 * This callback is mandatory for atomic drivers.
 	 */
 	void (*atomic_destroy_state)(struct drm_plane *plane,
 				     struct drm_plane_state *state);