From: Shirish S <shiris...@amd.com>
Add reverse iterator for_each_oldnew_plane_in_state_reverse to compliment the
for_each_oldnew_plane_in_state way or reading plane states.
The plane states are required to be read in reverse order for amd drivers,
cause the z order convention followed in linux is opposite to how the planes
are supposed to be presented to DC engine, which is in common to both windows
and linux.
V2: fix compile time errors due to -Werror flag.
Signed-off-by: Shirish S <shiris...@amd.com>
Signed-off-by: Pratik Vishwakarma <pratik.vishwaka...@amd.com>
---
include/drm/drm_atomic.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index
cf13842..3fe8dde 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -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
--
2.7.4
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