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

[Chris Wilson]

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.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre