regression on raven (gmc9)

[Christian König]

Am 02.04.2018 um 17:00 schrieb Alex Deucher:
> On Mon, Apr 2, 2018 at 7:17 AM, Tom St Denis <tstdenis at amd.com> wrote:
>> This commit
>>
>> [root at raven linux]# git bisect bad
>> c704d7a15d292e6e222b7e990ed7e9f41617cdd8 is the first bad commit
>> commit c704d7a15d292e6e222b7e990ed7e9f41617cdd8
>> Author: Alex Deucher <alexander.deucher at amd.com>
>> Date:   Tue Mar 27 17:10:56 2018 -0500
>>
>>      drm/amdgpu/gmc9: use amdgpu_ring_emit_reg_write_reg_wait in gpu tlb
>> flush
>>
>>      Use amdgpu_ring_emit_reg_write_reg_wait.  On engines that support it,
>>      it provides a write and wait in a single packet which avoids a missed
>>      ack if a world switch happens between the request and waiting for the
>>      ack.
>>
>>      Reviewed-by: Huang Rui <ray.huang at amd.com>
>>      Reviewed-by: Christian König <christian.koenig at amd.com>
>>      Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>>
>> :040000 040000 a08a12a316d09ea231337136cc7aa076d4da44a8
>> 521c8a18b0c63e185e416a267619a92822d7f268 M      drivers
>>
>> Causes my raven1 to lockup on starting X with a gfx ring stall.
> I've reverted the patches.

Yeah, you need a specialized firmware version for this which Raven 
probably doesn't have.

Anyway the root cause of the issue which should be fixed by this patch 
set was found in the meantime, so the whole patch set shouldn't be 
necessary any more.

Christian.

>
> Alex
>
>> Tom
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