linux-kernel - Re: [PATCH AUTOSEL 5.13 113/189] drm/amdgpu/gfx9: fix the doorbell missing when in CGPG issue.

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Date:   Tue, 6 Jul 2021 19:09:37 -0400
From:   Felix Kuehling <felix.kuehling@....com>
To:     Alex Deucher <alexdeucher@...il.com>,
        Sasha Levin <sashal@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "for 3.8" <stable@...r.kernel.org>,
        Yifan Zhang <yifan1.zhang@....com>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH AUTOSEL 5.13 113/189] drm/amdgpu/gfx9: fix the doorbell
 missing when in CGPG issue.

Am 2021-07-06 um 5:44 p.m. schrieb Alex Deucher:
> On Tue, Jul 6, 2021 at 7:16 AM Sasha Levin <sashal@...nel.org> wrote:
>> From: Yifan Zhang <yifan1.zhang@....com>
>>
>> [ Upstream commit 631003101c516ea29a74aee59666708857b9a805 ]
>>
>> If GC has entered CGPG, ringing doorbell > first page doesn't wakeup GC.
>> Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround this issue.
>>
>> Signed-off-by: Yifan Zhang <yifan1.zhang@....com>
>> Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
>> Reviewed-by: Alex Deucher <alexander.deucher@....com>
>> Signed-off-by: Alex Deucher <alexander.deucher@....com>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
> This should be dropped.  It was already reverted.

Patch 146 of this series is the corresponding revert.

Regards,
  Felix

>
> Alex
>
>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>> index 516467e962b7..c09225d065c2 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
>> @@ -3673,8 +3673,12 @@ static int gfx_v9_0_kiq_init_register(struct amdgpu_ring *ring)
>>         if (ring->use_doorbell) {
>>                 WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_LOWER,
>>                                         (adev->doorbell_index.kiq * 2) << 2);
>> +               /* If GC has entered CGPG, ringing doorbell > first page doesn't
>> +                * wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround
>> +                * this issue.
>> +                */
>>                 WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
>> -                                       (adev->doorbell_index.userqueue_end * 2) << 2);
>> +                                       (adev->doorbell.size - 4));
>>         }
>>
>>         WREG32_SOC15_RLC(GC, 0, mmCP_HQD_PQ_DOORBELL_CONTROL,
>> --
>> 2.30.2
>>
>> _______________________________________________
>> amd-gfx mailing list
>> amd-gfx@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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