linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Fix screen flickering on X

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Date:	Thu, 7 May 2015 15:18:27 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	Matt Roper <matthew.d.roper@...el.com>,
	Ismael Luceno <ismael@...ev.co.uk>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Fix screen flickering on X

On Thu, May 07, 2015 at 04:41:48PM +0300, Jani Nikula wrote:
> On Thu, 07 May 2015, Matt Roper <matthew.d.roper@...el.com> wrote:
> > On Thu, May 07, 2015 at 12:12:18PM +0300, Jani Nikula wrote:
> >> On Thu, 23 Apr 2015, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> >> > [cc'ing the authors]
> >> 
> >> This has been posted earlier [1] and it has review to be addressed [2].
> >> 
> >> BR,
> >> Jani.
> >
> > I agree with Ander's response in [2]...we can't call
> > intel_update_watermarks() in the commit function because we're under
> > vblank evasion.  We should already be flagging the transaction as
> > needing a watermark update in intel_check_cursor_plane(), and that flag
> > will be acted upon immediately after the commit functions are done
> > running, once we've re-enabled interrupts.
> >
> > Note that our current codebase looks a bit different since we've dropped
> > intel_crtc->cursor_{width,height}.  So the relevant check in
> > intel_check_cursor_plane() now looks like:
> >
> >         if (plane->state->crtc_w != state->base.crtc_w)
> >                 intel_crtc->atomic.update_wm = true;
> >
> > Is there a bugzilla open on this issue with more details?
> 
> Not that I know of. Ismael?
> 

Probably:
https://bugs.freedesktop.org/show_bug.cgi?id=88944
https://bugzilla.redhat.com/show_bug.cgi?id=1199890
are related.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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