On Mon, Feb 24, 2014 at 12:48:55PM +0900, Michel Dänzer wrote:
> On Fre, 2014-02-21 at 21:03 +0200, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> >
> > We can kill of the drm_vblank_{pre,post}_modeset() calls since those are
> > there simply to make drm_vblank_get() fail during a modeset.
>
> Actually, their original purpose was to keep the DRM vblank counter
> consistent across modesets, assuming the modeset resets the hardware
> vblank counter.
I see. Well, actually I really don't. The code is too funky for me to
tell what it actually ends up doing. The obvious way would be to
resample the hardware counter at drm_vblank_post_modeset(), which the
code certainly doesn't do. But maybe it did something sensible in the
past.
--
Ville Syrjälä
Intel OTC
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