linux-kernel - Re: [PATCH] arm64: dts: mt8192: Add adsp power domain controller

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Date:   Thu, 1 Dec 2022 17:10:41 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Allen-KH Cheng <allen-kh.cheng@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] arm64: dts: mt8192: Add adsp power domain controller

On Thu, Dec 1, 2022 at 5:07 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 01/12/22 08:33, Allen-KH Cheng ha scritto:
> > Add adsp power domain controller node for mt8192 SoC.
> >
> > Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
> > ---
> > Ref: https://lore.kernel.org/all/2ec80bd8-dfef-d2e6-eb41-6e6088043e33@collabora.com/
> >      [Allen-KH Cheng <allen-kh.cheng@...iatek.com>]
> > ---
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8192.dtsi | 8 ++++++++
> >   include/dt-bindings/power/mt8192-power.h | 1 +
> >   2 files changed, 9 insertions(+)
> >
>
> Allen, thanks for this one, but it's incomplete...
>
> First of all, you must add the power domain on the driver itself, specifically,
> in drivers/soc/mediatek/mt8192-pm-domains.h - otherwise this change will have no
> effect!

Actually it's worse. The driver doesn't know about the new power domain,
and so it will fail to probe. We might need to make the power domain driver
fail gracefully and skip unknown power domains.

ChenYu

> ...Then, as Chen-Yu said, you should also add the power domain to the scp_adsp
> clock node as that's solving the lockup issue...
>
> .......and last, but not least: we need a Fixes tag to backport this fix, here
> and on the commit that adds the missing power domain in the driver.
>
> Thanks,
> Angelo
>
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > index 424fc89cc6f7..e71afba871fc 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > @@ -514,6 +514,14 @@
> >                                               };
> >                                       };
> >                               };
> > +
> > +                             power-domain@...192_POWER_DOMAIN_ADSP {
> > +                                     reg = <MT8192_POWER_DOMAIN_ADSP>;
> > +                                     clocks = <&topckgen CLK_TOP_ADSP_SEL>;
> > +                                     clock-names = "adsp";
> > +                                     mediatek,infracfg = <&infracfg>;
> > +                                     #power-domain-cells = <0>;
> > +                             };
> >                       };
> >               };
> >
> > diff --git a/include/dt-bindings/power/mt8192-power.h b/include/dt-bindings/power/mt8192-power.h
> > index 4eaa53d7270a..63e81cd0d06d 100644
> > --- a/include/dt-bindings/power/mt8192-power.h
> > +++ b/include/dt-bindings/power/mt8192-power.h
> > @@ -28,5 +28,6 @@
> >   #define MT8192_POWER_DOMAIN_CAM_RAWA        18
> >   #define MT8192_POWER_DOMAIN_CAM_RAWB        19
> >   #define MT8192_POWER_DOMAIN_CAM_RAWC        20
> > +#define MT8192_POWER_DOMAIN_ADSP     21
> >
> >   #endif /* _DT_BINDINGS_POWER_MT8192_POWER_H */
> >
>