linux-kernel - Re: [PATCH 4/4] drm/msm/a6xx: Add a comment to acd

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Message-ID: <CACSVV037e-GquRk7P1_qT7T4HF=f-TF93FpJ16NiKShqicaCfw@mail.gmail.com>
Date: Tue, 2 Sep 2025 08:57:19 -0700
From: Rob Clark <rob.clark@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Akhil P Oommen <akhilpo@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drm/msm/a6xx: Add a comment to acd_probe()

On Tue, Sep 2, 2025 at 5:33 AM Konrad Dybcio
<konrad.dybcio@....qualcomm.com> wrote:
>
> On 9/2/25 1:50 PM, Akhil P Oommen wrote:
> > It is not obvious why we can skip error checking of
> > dev_pm_opp_find_freq_exact() API. Add a comment explaining it.
> >
> > Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> > ---
> >  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > index ea52374c9fcd481d816ed9608e9f6eb1c2e3005a..de8f7051402bf0fd931fc065b5c4c49e2bfd5dc7 100644
> > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > @@ -1694,6 +1694,7 @@ static int a6xx_gmu_acd_probe(struct a6xx_gmu *gmu)
> >               u32 val;
> >
> >               freq = gmu->gpu_freqs[i];
> > +             /* This is unlikely to fail because we are passing back a known freq */
>
> This could probably mention that known == we just retrieved it a couple
> function calls above, but I suppose the reader can come up with such
> conclusions

Also, I think s/unlikely/not expected/ ?  "Unlikely" implies that it
could still happen..

BR,
-R

>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>
> Konrad