[Intel-gfx] [PATCH i-g-t v4 4/5] kms_vblank: Switch from using crtc0 statically to explicitly setting mode.

[Chris Wilson]

On Tue, May 10, 2016 at 08:19:50PM +0300, Ville Syrjälä wrote:
> > [46796.049127] [drm:drm_update_vblank_count] updating vblank count on crtc 1: current=72, diff=1, hw=72 hw_last=71
> > [46796.049129] [drm:drm_handle_vblank_events] vblank event on 73, current 73
> 
> Either we had a stale event in the queue, or something else is busted.
> Did someone really request an event on seq==73?

Yes, it uses an event a short while after the expected end of the test
for two purposes: a timing check, to keep the vblank alive (for
measuring the overhead of doing vblank_get on each query).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre