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From: =?UTF-8?B?QmFybmFiw6FzIEN6w6ltw6Fu?= <trabarni@gmail.com>
Date: Tue, 4 Jun 2024 19:45:42 +0200
Message-ID: <CAGsSOWVoO2JTcWNR0GH=OeyH8EzqOr64Bv=FZTrbSu6ZbD-=Eg@mail.gmail.com>
Subject: Re: [PATCH] drm/msm/adreno: Add support for Adreno 505 GPU
To: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>, 
	Abhinav Kumar <quic_abhinavk@quicinc.com>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, 
	Marijn Suijten <marijn.suijten@somainline.org>, David Airlie <airlied@gmail.com>, 
	Daniel Vetter <daniel@ffwll.ch>, linux-arm-msm@vger.kernel.org, 
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, 
	linux-kernel@vger.kernel.org, Daniil Titov <daniilt971@gmail.com>
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On Tue, Jun 4, 2024 at 7:38=E2=80=AFPM Konrad Dybcio <konrad.dybcio@linaro.=
org> wrote:
>
>
>
> On 6/4/24 19:33, Barnab=C3=A1s Cz=C3=A9m=C3=A1n wrote:
> > On Tue, Jun 4, 2024 at 7:06=E2=80=AFPM Konrad Dybcio <konrad.dybcio@lin=
aro.org> wrote:
> >>
> >>
> >>
> >> On 6/4/24 18:45, Barnab=C3=A1s Cz=C3=A9m=C3=A1n wrote:
> >>> On Tue, Jun 4, 2024 at 2:27=E2=80=AFPM Barnab=C3=A1s Cz=C3=A9m=C3=A1n=
 <trabarni@gmail.com> wrote:
> >>>>
> >>>> On Tue, Jun 4, 2024 at 1:55=E2=80=AFPM Konrad Dybcio <konrad.dybcio@=
linaro.org> wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 6/4/24 02:20, Barnab=C3=A1s Cz=C3=A9m=C3=A1n wrote:
> >>>>>> From: Daniil Titov <daniilt971@gmail.com>
> >>>>>>
> >>>>>> This GPU is found on SoCs such as MSM8937 (450 MHz), MSM8940 (475 =
MHz),
> >>>>>> SDM439 (650 MHz).
> >>>>>>
> >>>>>> Signed-off-by: Daniil Titov <daniilt971@gmail.com>
> >>>>>> Signed-off-by: Barnab=C3=A1s Cz=C3=A9m=C3=A1n <trabarni@gmail.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 =3D 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 closi=
ng
> >> kmscube in a rapid fashion and checking if the GPU starts crashing for
> >> unknown reasons (the dmesg would denote that)
> >>
> > I have checked on a505 and a506 with this small script
> > while true; do kmscube; kill kmscube; done
> > none of them crashing, so i am going to change it.
>
> Hmm.. not sure if it actually idled when tested in a tight loop.. If you'=
re
> running bash, try "while true; do kmscube &; sleep 0.08; pkill -f kmscube=
; sleep 0.08;done"
>
I see no crash
> Konrad