Re: [PATCH] drm/i915: Click the ACTHD three times to go home

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Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:

> On Mon, Mar 27, 2017 at 01:12:30PM +0300, Mika Kuoppala wrote:
>> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxx>

> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre
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