drm/vblank: Add helper to get next vblank time
Will be used in the next commit to set a deadline on fences that an atomic update is waiting on. v2: Calculate time at *start* of vblank period, not end v3: Fix kbuild complaints Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
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