[PATCH 5/5] drm/i915: Allow vblank interrupts during modeset and eliminate some vblank races (original) (raw)

Ville Syrjälä ville.syrjala at linux.intel.com
Mon Feb 24 04:11:01 PST 2014

On Mon, Feb 24, 2014 at 12:48:55PM +0900, Michel Dänzer wrote:

On Fre, 2014-02-21 at 21:03 +0200, ville.syrjala at linux.intel.com wrote: > > We can kill of the drmvblank{pre,post}modeset() calls since those are > there simply to make drmvblankget() 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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