[Libva] [PATCH] va/x11: Require synchronisation to vblank with DRI2SwapBuffers

[Xiang, Haihao]

Hi,

Someone got lockup with this patch and I don't see the issue is
resolved, please check the thread below

https://lists.freedesktop.org/archives/intel-gfx/2015-December/083572.h
tml  ([Intel-gfx] vsync + vaapi question).

and this is the last response:

https://lists.freedesktop.org/archives/intel-gfx/2015-December/083862.h
tml

I will revert this patch until we root the cause.

Thanks
Haihao


> On Wed, Nov 16, 2016 at 1:35 AM, Chris Wilson <chris at chris-wilson.co.
> uk> wrote:
> > On Thu, Dec 24, 2015 at 03:48:07PM +0000, Chris Wilson wrote:
> > > On Thu, Dec 24, 2015 at 03:42:37PM +0000, Chris Wilson wrote:
> > > > By passing divisor=0, we imply we do not care about
> > > > synchronisation of
> > > > this request to the vertical refresh - the spec says that if we
> > > > miss the
> > > > target frame, the swap will be presented as quickly as possible
> > > > and may
> > > > forgo waiting until the next vblank. By using divisor=1, we
> > > > request that
> > > > the swap be presented upon the vertical refresh immediately
> > > > following
> > > > recipe, enforcing the synchronisation to vblank and avoiding
> > > > tearing.
> > >   ^receipt
> > 
> > Ping.
> > -Chris
> > 
> 
> 
> This fell through, this is fine.
> 
> lgtm, applied.
> 
> Sean
> 
> 
> > --
> > Chris Wilson, Intel Open Source Technology Centre
> > _______________________________________________
> > Libva mailing list
> > Libva at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/libva
> 
> 
>