linux-kernel - Re: [PATCH v3] arm64: dts: mt8195-cherry-tomato: change watchdog reset boot flow

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Date: Wed, 24 Jan 2024 17:04:35 +0800
From: Hsin-Te Yuan <yuanhsinte@...omium.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Hsin-Te Yuan <yuanhsinte@...omium.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3] arm64: dts: mt8195-cherry-tomato: change watchdog
 reset boot flow

Hi AngeloGioacchino,

This bug can be triggered by stopping watchdog daemon and running
`sleep 60 > /dev/watchdog`.

Regards,
Hsin-Te



On Wed, Jan 24, 2024 at 4:27 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 24/01/24 08:51, Hsin-Te Yuan ha scritto:
> > From: Hsin-Te Yuan <yuanhsinte@...gle.com>
> >
> > The external output reset signal was originally disabled and sent from
> > firmware. However, an unfixed bug in the firmware on tomato prevents
> > the signal from being sent, causing the device to fail to boot. To fix
> > this, enable external output reset signal to allow the device to reboot
> > normally.
> >
> > Fixes: 5eb2e303ec6b ("arm64: dts: mediatek: Introduce MT8195 Cherry platform's Tomato")
> > Signed-off-by: Hsin-Te Yuan <yuanhsinte@...omium.org>
>
> Can't trigger the bug, but also this commit gives no side effects, so:
>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>
>
> > ---
> > Changes in v3:
> > - Add Fixes tag
> >
> > Changes in v2:
> > - Limit the effect only on tomato.
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts | 4 ++++
> >   arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts | 4 ++++
> >   arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts | 4 ++++
> >   3 files changed, 12 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> > index 2d5e8f371b6de..a82d716f10d44 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> > @@ -23,3 +23,7 @@ &sound {
> >   &ts_10 {
> >       status = "okay";
> >   };
> > +
> > +&watchdog {
> > +     /delete-property/ mediatek,disable-extrst;
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> > index 2586c32ce6e6f..2fe20e0dad836 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> > @@ -43,3 +43,7 @@ &sound {
> >   &ts_10 {
> >       status = "okay";
> >   };
> > +
> > +&watchdog {
> > +     /delete-property/ mediatek,disable-extrst;
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> > index f54f9477b99da..dd294ca98194c 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> > @@ -44,3 +44,7 @@ &sound {
> >   &ts_10 {
> >       status = "okay";
> >   };
> > +
> > +&watchdog {
> > +     /delete-property/ mediatek,disable-extrst;
> > +};
> >
> > ---
> > base-commit: 64b50fcb03649ca7f0d762a50e7a3484cfc1d586
> > change-id: 20230818-send-upstream-e91e615a893c
> >
> > Best regards,
>