Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> On Thu, Apr 13, 2017 at 02:15:27PM +0300, Mika Kuoppala wrote:
>> Previously with commit a9c1f90c8e17
>> ("drm/i915: Don't mask EI UP interrupt on IVB|SNB") certain,
>> seemingly unrelated bit (GEN6_PM_RP_UP_EI_EXPIRED) was needed
>> to be unmasked for IVB and SNB in order to prevent system hang
>> with chained batchbuffers.
>>
>> Our CI was seeing incomplete results with tests that used
>> chained batches and it was found out that HSW needs to have this
>> same bit unmasked to reliably survive chained batches.
>>
>> Always unmask GEN6_PM_RP_UP_EI_EXPIRED on Haswell to
>> prevent system hang with batch chaining.
>>
>> Testcase: igt/gem_exec_fence/nb-await-default
>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100672
>> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>> Cc: stable@xxxxxxxxxxxxxxx
>> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
>
> * facepalm.
>
> I am amazed that took so long for us to notice.
> Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>
Pushed to drm-intel-next-queued. Thanks.
-Mika
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