linux-kernel - Re: [PATCH resend] arm64: dts: mediatek: mt8192: Mark scp

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Message-ID: <CAGXv+5E=X_hwg76=B_jqWrpieo8bR-=r8NLbNz2=JzE=kBwMWQ@mail.gmail.com>
Date:   Thu, 1 Dec 2022 16:56:03 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "allen-kh.cheng" <allen-kh.cheng@...iatek.com>
Subject: Re: [PATCH resend] arm64: dts: mediatek: mt8192: Mark scp_adsp clock
 as broken

On Wed, Nov 30, 2022 at 7:10 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 30/11/22 04:17, Chen-Yu Tsai ha scritto:
> > The scp_adsp clock controller is under the SCP_ADSP power domain. This
> > power domain is currently not supported nor defined.
> >
> > Mark the clock controller as broken for now, to avoid the system from
> > trying to access it, and causing the CPU or bus to stall.
> >
> > Fixes: 5d2b897bc6f5 ("arm64: dts: mediatek: Add mt8192 clock controllers")
> > Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
>
> ....or we can add the ADSP power domain to actually fix this properly, which looks
> like being a generally good idea :-)

Sure, but that and any driver changes have to be backported, or anything
touching the clocks will still break the system.

There's no reason we can't have both. I think having this one merged and
backported to stable first, then adding the SCP_ADSP power domain, and tying
it to the clock controller as a follow up addition works best.

What do you think?

ChenYu

> Allen, can you please take care of that?
>
> Thank you,
> Angelo
>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8192.dtsi | 2 ++
> >   1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > index 6b20376191a7..ef91941848ae 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> > @@ -575,6 +575,8 @@ scp_adsp: clock-controller@...20000 {
> >                       compatible = "mediatek,mt8192-scp_adsp";
> >                       reg = <0 0x10720000 0 0x1000>;
> >                       #clock-cells = <1>;
> > +                     /* power domain dependency not upstreamed */
> > +                     status = "broken";
> >               };
> >
> >               uart0: serial@...02000 {
> >
>