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drm/atomic: Add new reverse iterator over all plane state (V2) 

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 <shirish.s@amd.com>
Signed-off-by: Pratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1520392203-6885-1-git-send-email-shirish.s@amd.com
This commit is contained in:
Shirish S 2018-03-07 08:40:03 +05:30 committed by Harry Wentland
parent 100bc0d996
commit 55de292384
1 changed files with 22 additions and 0 deletions
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22
include/drm/drm_atomic.h
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@ -753,6 +753,28 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(old_plane_state) = (__state)->planes[__i].old_state,\
(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