]> git.baikalelectronics.ru Git - kernel.git/commit
drm: Add drm_rotation_simplify()
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 8 Jul 2014 05:01:56 +0000 (10:31 +0530)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 11 Jul 2014 21:44:20 +0000 (23:44 +0200)
commitba4812240bafae0661176d59712cce7a374a1f53
tree498d4cdc426a6ec39cbc3da562f75c3d20cbef25
parent401d69376ca6b0e837f28f183825e00d927ee722
drm: Add drm_rotation_simplify()

drm_rotation_simplify() can be used to eliminate unsupported rotation
flags. It will check if any unsupported flags are present, and if so
it will modify the rotation to an alternate form by adding 180 degrees
to rotation angle, and flipping the reflect x and y bits. The hope is
that this identity transform will eliminate the unsupported flags.

Of course that might not result in any more supported rotation, so
the caller is still responsible for checking the result afterwards.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/drm_crtc.c
include/drm/drm_crtc.h