[Intel-gfx] [PATCH 09/12] drm/i915: rip our vblank reset hacks for runtime PM
thierry.reding at gmail.com
Wed May 21 05:49:05 PDT 2014
On Tue, May 20, 2014 at 03:03:41PM +0300, Ville Syrjälä wrote:
> On Wed, May 14, 2014 at 08:51:11PM +0200, Daniel Vetter wrote:
> > Now that we unconditionally dtrt when disabling/enabling crtcs we
> > don't need any hacks any longer to keep the vblank logic sane when
> > all the registers go poof. So let's rip it all out.
> Hmm. drm_update_vblank_count() will now see some kind of diff between
> the last and current value when the registers got cloberred. So the
> vblank counter reported to userspace will jump. But I guess that's fine
> as long as userspace realizes that the counter is not at all reliable
> across modesets.
I think that's a fair assumption. Modeset is kind of a heavy operation
and I wouldn't expect applications to perform one all that often. That
should be even more true of applications that rely on the counters. At
least that would be my expectation.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 836 bytes
Desc: not available
More information about the dri-devel