linux-kernel - Re: [PATCH 2/2] media: platform: mtk-mdp3: Use devicetree phandle to retrieve SCP

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Message-ID: <CAGXv+5EQYTetP8OaZMRZKjmFtQ_mEgFKCBBPyW-SVCCNczzisw@mail.gmail.com>
Date:   Tue, 19 Sep 2023 18:26:58 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     wens@...nel.org, mchehab@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        matthias.bgg@...il.com, moudy.ho@...iatek.com,
        hverkuil-cisco@...all.nl, sakari.ailus@...ux.intel.com,
        u.kleine-koenig@...gutronix.de, linqiheng@...wei.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 2/2] media: platform: mtk-mdp3: Use devicetree phandle to
 retrieve SCP

On Tue, Sep 19, 2023 at 6:24 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 19/09/23 12:21, Chen-Yu Tsai ha scritto:
> > On Tue, Sep 19, 2023 at 6:00 PM AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@...labora.com> wrote:
> >>
> >> Instead of walking the entire parent node for something that has the
> >> right compatible, use the scp_get() function provided by the MediaTek
> >> SCP remoteproc driver to retrieve a handle to mtk_scp through the
> >> devicetree "mediatek,scp" (phandle) property.
> >>
> >> In case of multi-core SCP, this also allows to select a specific core.
> >>
> >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >> ---
> >>   .../media/platform/mediatek/mdp3/mtk-mdp3-core.c | 16 ++++++++++------
> >>   1 file changed, 10 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> >> index 8677e7fd5083..d93d3833633e 100644
> >> --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> >> +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> >> @@ -254,13 +254,17 @@ static int mdp_probe(struct platform_device *pdev)
> >>                  goto err_destroy_job_wq;
> >>          }
> >>
> >> -       mm_pdev = __get_pdev_by_id(pdev, NULL, MDP_INFRA_SCP);
> >> -       if (WARN_ON(!mm_pdev)) {
> >> -               dev_err(&pdev->dev, "Could not get scp device\n");
> >> -               ret = -ENODEV;
> >> -               goto err_destroy_clock_wq;
> >> +       mdp->scp = scp_get(pdev);
> >> +       if (!mdp->scp) {
> >> +               mm_pdev = __get_pdev_by_id(pdev, NULL, MDP_INFRA_SCP);
> >> +               if (WARN_ON(!mm_pdev)) {
> >> +                       dev_err(&pdev->dev, "Could not get scp device\n");
> >> +                       ret = -ENODEV;
> >> +                       goto err_destroy_clock_wq;
> >> +               }
> >> +               mdp->scp = platform_get_drvdata(mm_pdev);
> >
> > You need to keep the original code as a fallback for old device trees.
> >
>
> I haven't removed the original code, it *is* there as a fallback :-)
>
> mdp->scp = scp_get() <--- new
> if (!mdp->scp) { fallback }

I see it now. I guess it's time to call it a day... I even replied with
the wrong email ...

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>

> > ChenYu
> >
> >>          }
> >> -       mdp->scp = platform_get_drvdata(mm_pdev);
> >> +
> >>          mdp->rproc_handle = scp_get_rproc(mdp->scp);
> >>          dev_dbg(&pdev->dev, "MDP rproc_handle: %pK", mdp->rproc_handle);
> >>
> >> --
> >> 2.42.0
> >>
> > _______________________________________________
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>
>