linux-kernel - Re: [PATCH] drm/msm/adreno: Add support for Adreno 505 GPU

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Date: Tue, 4 Jun 2024 19:06:09 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Barnabás Czémán <trabarni@...il.com>
Cc: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 Daniil Titov <daniilt971@...il.com>
Subject: Re: [PATCH] drm/msm/adreno: Add support for Adreno 505 GPU



On 6/4/24 18:45, Barnabás Czémán wrote:
> On Tue, Jun 4, 2024 at 2:27 PM Barnabás Czémán <trabarni@...il.com> wrote:
>>
>> On Tue, Jun 4, 2024 at 1:55 PM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>>
>>>
>>>
>>> On 6/4/24 02:20, Barnabás Czémán wrote:
>>>> From: Daniil Titov <daniilt971@...il.com>
>>>>
>>>> This GPU is found on SoCs such as MSM8937 (450 MHz), MSM8940 (475 MHz),
>>>> SDM439 (650 MHz).
>>>>
>>>> Signed-off-by: Daniil Titov <daniilt971@...il.com>
>>>> Signed-off-by: Barnabás Czémán <trabarni@...il.com>
>>>> ---
>>>
>>> This all looks very good, just a nit
>>>
>>> [...]
>>>
>>>> +             /*
>>>> +              * Increase inactive period to 250 to avoid bouncing
>>>> +              * the GDSC which appears to make it grumpy
>>>> +              */
>>>> +             .inactive_period = 250,
>>>
>>> Are you sure this is actually necessary?
>> Every A5XX GPU is using the same value, but i have never tried with
>> DRM_MSM_INACTIVE_PERIOD.
> This was the original patch
> https://lore.kernel.org/all/20180507224750.9383-1-jcrouse@codeaurora.org/
> where the inactive period was increased for a530. I cannot test
> suspend on msm8937 yet.

The suspend here refers to device suspend, not system suspend. Adreno
goes into device suspend every time you stop using it, i.e. after the
rendering is done and there's no more work to do.

I suppose a good test scenario here would be to keep running and closing
kmscube in a rapid fashion and checking if the GPU starts crashing for
unknown reasons (the dmesg would denote that)

> I can check on msm8953 with a506 maybe if a506 works fine with
> DRM_MSM_INACTIVE_PERIOD
> then a505 would be fine with it also.

The more testing the merrier :)

Konrad