[Intel-gfx] [PATCH] drm/i915: Click the ACTHD three times to go home

[Chris Wilson]

On Mon, Mar 27, 2017 at 04:19:58PM +0300, Mika Kuoppala wrote:
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > On Mon, Mar 27, 2017 at 01:12:30PM +0300, Mika Kuoppala wrote:
> >> Chris Wilson <chris at chris-wilson.co.uk> writes:
> >> 
> >> > One POSTING_READ of ACTHD may not be enough to ensure that the seqno
> >> > write has been posted from the GPU and is now visible. So do three!
> >> >
> >> 
> >> Is this about posting read triggering or just adding enough delay
> >> that the write gets through?
> >
> > It's purely about a delay that we guess will cover 99.9999% of cases.
> 
> Acked-by: Mika Kuoppala <mika.kuoppala at intel.com>

Thanks, for checking over the idea. I'm going to apply it to
topic/core-for-CI for some extended soak testing and see if that
silences fi-snb-2600
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre