Re: [Intel-gfx] [PATCH v2 01/21] drm/core: Add drm_accurate_vblank_count, v5.

I'm fine with it. I assume the function will only be used by kms drivers, whose writers probably know when it is safe to call the function, ie. what kind of potential quirks the kms drivers timestamping implementation has. Reviewed-by: Mario Kleiner On 05/17/2016

[Intel-gfx] [PATCH v2 01/21] drm/core: Add drm_accurate_vblank_count, v5.

This function is useful for gen2 intel devices which have no frame counter, but need a way to determine the current vblank count without racing with the vblank interrupt handler. intel_pipe_update_start checks if no vblank interrupt will occur during vblank evasion, but cannot check whether the