linux-kernel - Re: [PATCH 5/5] drm/msm/a5xx: Enable optional icc voting from OPP tables

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Date:   Wed, 22 Feb 2023 23:14:15 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] drm/msm/a5xx: Enable optional icc voting from OPP
 tables



On 22.02.2023 23:12, Dmitry Baryshkov wrote:
> On 22/02/2023 23:47, Konrad Dybcio wrote:
>> Add the dev_pm_opp_of_find_icc_paths() call to let the OPP framework
>> handle bus voting as part of power level setting.
> 
> This can probably go to the generic code path rather than sticking it into a5xx only.
The reasoning is explained in the cover letter, a3xx/a4xx already
have "raw" icc set calls which would require more work (and above
all, testing) to untangle while keeping backwards compat, this is
a midterm solution that would allow getting scaling to work earlier.

Konrad
> 
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>   drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> index d09221f97f71..a33af0cc27b6 100644
>> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
>> @@ -1775,5 +1775,9 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
>>       /* Set up the preemption specific bits and pieces for each ringbuffer */
>>       a5xx_preempt_init(gpu);
>>   +    ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);
>> +    if (ret)
>> +        return ERR_PTR(ret);
>> +
>>       return gpu;
>>   }
>>
>