[Intel-gfx] [PATCH] drm/i915: Revert "drm/i915/tgl: Wa_1607138340"

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Quoting Tvrtko Ursulin (2020-01-08 16:19:54)
>> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>> 
>> This reverts commit 08fff7aeddc9dd72161b4c8fc27fbab12b4b9352.
>> 
>> For some yet unexplained reason not having this improves stability of some
>> media workloads.
>> 
>> Promise is that the media hang will be root caused properly and in the
>> meantime absence of this workaround is unlikely to cause problems.
>
> I suspect this is shooting the messenger. The danger is that we rely on
> FORCE_RESTORE for preemption, and so if this bit is triggering the issue,
> their problem just becomes more sporadic.

Noted. But lets get a sample point with A0. We kind
of know where to focus our gaze from now on.

Acked-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>