1 files changed, 23 insertions, 1 deletions

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index cf13842a6dbd..a57a8aa90ffb 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -154,7 +154,7 @@ struct __drm_crtcs_state {
 	struct drm_crtc *ptr;
 	struct drm_crtc_state *state, *old_state, *new_state;
 	s32 __user *out_fence_ptr;
-	unsigned last_vblank_count;
+	u64 last_vblank_count;
 };
 
 struct __drm_connnectors_state {
@@ -754,6 +754,28 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 			      (new_plane_state) = (__state)->planes[__i].new_state, 1))
 
 /**
+ * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic
+ * update in reverse order
+ * @__state: &struct drm_atomic_state pointer
+ * @plane: &struct drm_plane iteration cursor
+ * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
+ * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
+ * @__i: int iteration cursor, for macro-internal use
+ *
+ * This iterates over all planes in an atomic update in reverse order,
+ * tracking both old and  new state. This is useful in places where the
+ * state delta needs to be considered, for example in atomic check functions.
+ */
+#define for_each_oldnew_plane_in_state_reverse(__state, plane, old_plane_state, new_plane_state, __i) \
+	for ((__i) = ((__state)->dev->mode_config.num_total_plane - 1);	\
+	     (__i) >= 0;						\
+	     (__i)--)							\
+		for_each_if ((__state)->planes[__i].ptr &&		\
+			     ((plane) = (__state)->planes[__i].ptr,	\
+			      (old_plane_state) = (__state)->planes[__i].old_state,\
+			      (new_plane_state) = (__state)->planes[__i].new_state, 1))
+
+/**
  * for_each_old_plane_in_state - iterate over all planes in an atomic update
  * @__state: &struct drm_atomic_state pointer
  * @plane: &struct drm_plane iteration cursor