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

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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>

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Michel Dänzer 2015-05-26 17:53:38 +09:00 • committed by Daniel Vetter

parent 60f207a5b6

commit 5ceecb2fa7

1 changed files with 2 additions and 2 deletions

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drivers/gpu/drm/drm_irq.c

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