linux-kernel - Re: [PATCH v2] arm64: dts: mediatek: mt8188: Assign apll1 clock as parent to avoid hang

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Message-ID: <6350446a-f253-4702-b1da-02e2915a3d30@collabora.com>
Date: Tue, 11 Feb 2025 15:30:45 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Matthias Brugger <matthias.bgg@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Fei Shao <fshao@...omium.org>
Cc: kernel@...labora.com, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, Trevor Wu (吳文良)
 <Trevor.Wu@...iatek.com>, Chen-Yu Tsai <wenst@...omium.org>,
 devicetree@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: mediatek: mt8188: Assign apll1 clock as
 parent to avoid hang

Il 07/02/25 18:41, Nícolas F. R. A. Prado ha scritto:
> Certain registers in the AFE IO space require the apll1 clock to be
> enabled in order to be read, otherwise the machine hangs (registers like
> 0x280, 0x410 (AFE_GAIN1_CON0) and 0x830 (AFE_CONN0_5)). During AFE
> driver probe, when initializing the regmap for the AFE IO space those
> registers are read, resulting in a hang during boot.
> 
> This has been observed on the Genio 700 EVK, Genio 510 EVK and
> MT8188-Geralt-Ciri Chromebook, all of which are based on the MT8188 SoC.
> 
> Assign CLK_TOP_APLL1_D4 as the parent for CLK_TOP_A1SYS_HP, which is
> enabled during register read and write, to make sure the apll1 is
> enabled during register operations and prevent the MT8188 machines from
> hanging during boot.
> 
> Cc: stable@...r.kernel.org
> Fixes: 4dbec3a59a71 ("arm64: dts: mediatek: mt8188: Add audio support")
> Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

> ---
> Changes in v2:
> - Changed patch from explicitly enabling apll1 clock in the driver to
>    assigning apll1_d4 as the parent for the a1sys_hp clock in the
>    mt8188.dtsi
> - Link to v1: https://lore.kernel.org/r/20241203-mt8188-afe-fix-hang-disabled-apll1-clk-v1-1-07cdd7760834@collabora.com
> ---
>   arch/arm64/boot/dts/mediatek/mt8188.dtsi | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8188.dtsi b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> index 5d78f51c6183c15018986df2c76e6fdc1f9f43b4..6352c9bd436550dce66435f23653ebcb43ccf0cd 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
> @@ -1392,7 +1392,7 @@ afe: audio-controller@...10000 {
>   			compatible = "mediatek,mt8188-afe";
>   			reg = <0 0x10b10000 0 0x10000>;
>   			assigned-clocks = <&topckgen CLK_TOP_A1SYS_HP>;
> -			assigned-clock-parents =  <&clk26m>;
> +			assigned-clock-parents = <&topckgen CLK_TOP_APLL1_D4>;
>   			clocks = <&clk26m>,
>   				 <&apmixedsys CLK_APMIXED_APLL1>,
>   				 <&apmixedsys CLK_APMIXED_APLL2>,
> 
> ---
> base-commit: ed58d103e6da15a442ff87567898768dc3a66987
> change-id: 20241203-mt8188-afe-fix-hang-disabled-apll1-clk-b3c11782cbaf
> 
> Best regards,