tree 4a9ad864ed2ff736c7138fa997875b7944601d6e
parent 60f207a5b6d8f23c2e8388b415e8d5c7311cc79d
author Michel Dänzer <michel.daenzer@amd.com> 1432630418 +0900
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1432724408 +0200

drm: Fix off-by-one in vblank hardware counter wraparound handling

dev->max_vblank_count contains the largest value that can be represented
by the hardware counter. When the hardware counter wraps around, we have
to add that value + 1 to get the same value as if the hardware counter
didn't wrap around.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>