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

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Date: Wed, 24 Jan 2024 09:27:35 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: 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>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 Hsin-Te Yuan <yuanhsinte@...gle.com>
Subject: Re: [PATCH v3] arm64: dts: mt8195-cherry-tomato: change watchdog
 reset boot flow

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,