[Intel-gfx] [PATCH] drm/i915/execlists: Flush the post-sync breadcrumb write harder

[Chris Wilson]

Quoting Chris Wilson (2019-08-28 14:09:23)
> Quoting Mika Kuoppala (2019-08-28 13:49:55)
> > Chris Wilson <chris at chris-wilson.co.uk> writes:
> > 
> > > Quite rarely we see that the CS completion event fires before the
> > > breadcrumb is coherent, which presumably is a result of the CS_STALL not
> > > waiting for the post-sync operation. Try following in a DC_FLUSH into
> > > the following pipecontrol to see if that makes any difference.
> > >
> > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > > Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> > 
> > Acked-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> 
> Yup, there's only way to find out if this helps... Ta,

And the answer came back straight away. Nope.

Sigh,
-Chris