Re: [PATCH 7/8] drm/irq: Implement a generic vblank_wait function

Thierry Reding
2014-07-30T15:10:42Z

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On Wed, Jul 30, 2014 at 05:06:38PM +0200, Daniel Vetter wrote:
> On Wed, Jul 30, 2014 at 04:24:06PM +0200, Thierry Reding wrote:
> > On Tue, Jul 29, 2014 at 11:32:22PM +0200, Daniel Vetter wrote:
> > [...]
> > > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> > [...]
> > > + ret = wait_event_timeout(dev->vblank[crtc].queue,
> > > + C, msecs_to_jiffies(100));
> >
> > 100 milliseconds looks like a very arbitrary choice. Theoretically we
> > support things like crtc->mode.vrefresh = 5, so I wonder if we should
> > parameterize this on the refresh rate, or simply increase it further?
>
> Once we have 10Hz panels I think we can pump/fix this. In i915 we've used
> 50ms everywhere, and never hit this. Except when driver bugs, ofc.

Okay, fair enough.

Thierry

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