linux-kernel - Re: [PATCH 3/3] ARM: dts: qcom: msm8974-sony-shinano: increase load on l21 for sdhc2

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Date: Fri, 21 Jun 2024 23:59:56 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Valeriy Klimin <vdos63@...il.com>
Cc: ~postmarketos/upstreaming <~postmarketos/upstreaming@...ts.sr.ht>, 
	phone-devel <phone-devel@...r.kernel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: dts: qcom: msm8974-sony-shinano: increase load
 on l21 for sdhc2

On Fri, Jun 21, 2024 at 11:14:48AM GMT, Valeriy Klimin wrote:
> SD cards would exhibit errors similar to ones described in commit
> 27fe0fc05f35 ("ARM: dts: msm8974-FP2: Increase load on l20 for sdhci")
> 
> This patch applies the same change to the regulator for sdhc2.
> 
> Signed-off-by: Valeriy Klimin <vdos63@...il.com>
> ---
>  arch/arm/boot/dts/qcom/qcom-msm8974pro-sony-xperia-shinano-common.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom/qcom-msm8974pro-sony-xperia-shinano-common.dtsi b/arch/arm/boot/dts/qcom/qcom-msm8974pro-sony-xperia-shinano-common.dtsi
> index e129bb1bd6ec..6af7c71c7158 100644
> --- a/arch/arm/boot/dts/qcom/qcom-msm8974pro-sony-xperia-shinano-common.dtsi
> +++ b/arch/arm/boot/dts/qcom/qcom-msm8974pro-sony-xperia-shinano-common.dtsi
> @@ -380,6 +380,8 @@ pm8941_l20: l20 {
>  		pm8941_l21: l21 {
>  			regulator-min-microvolt = <2950000>;
>  			regulator-max-microvolt = <2950000>;
> +			regulator-system-load = <500000>;
> +			regulator-allow-set-load;
>  			regulator-boot-on;
>  		};
>  

Just out of pure interest, how the value was choosen? Do you have any
reference to the vendor kernel or DT?

-- 
With best wishes
Dmitry