linux-kernel - Re: [PATCH 2/4] arm64: dts: qcom: sm8450: disable SDHCI SDR104/SDR50 on all boards

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Message-ID: <1ce38a7a-7c4d-32b0-dd53-90fd3b708d64@somainline.org>
Date:   Wed, 26 Oct 2022 22:12:08 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH 2/4] arm64: dts: qcom: sm8450: disable SDHCI SDR104/SDR50
 on all boards


On 26/10/2022 22:03, Krzysztof Kozlowski wrote:
> SDHCI on SM8450 HDK also has problems with SDR104/SDR50:
>
>    mmc0: card never left busy state
>    mmc0: error -110 whilst initialising SD card
>
> so I think it is safe to assume this issue affects all SM8450 boards.
> Move the quirk disallowing these modes to the SoC DTSI, to spare people
> working on other boards the misery of debugging this issue.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---

While I have no way to tell whether this is a common issue, it may as 
well be..


Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>


Konrad

>   arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara-pdx223.dts | 2 --
>   arch/arm64/boot/dts/qcom/sm8450.dtsi                          | 3 +++
>   2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara-pdx223.dts b/arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara-pdx223.dts
> index 718c690af8ad..ae8ba297b0b6 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara-pdx223.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8450-sony-xperia-nagara-pdx223.dts
> @@ -556,8 +556,6 @@ &sdhc_2 {
>   	pinctrl-1 = <&sdc2_sleep_state &sdc2_card_det_n>;
>   	vmmc-supply = <&pm8350c_l9>;
>   	vqmmc-supply = <&pm8350c_l6>;
> -	/* Forbid SDR104/SDR50 - broken hw! */
> -	sdhci-caps-mask = <0x3 0x0>;
>   	no-sdio;
>   	no-mmc;
>   	status = "okay";
> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> index 1df5c964c6f7..6800e05a549d 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> @@ -3412,6 +3412,9 @@ sdhc_2: sdhci@...4000 {
>   			bus-width = <4>;
>   			dma-coherent;
>   
> +			/* Forbid SDR104/SDR50 - broken hw! */
> +			sdhci-caps-mask = <0x3 0x0>;
> +
>   			status = "disabled";
>   
>   			sdhc2_opp_table: opp-table {