linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sc8280xp: fix UFS DMA coherency

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Date:   Mon, 5 Dec 2022 12:37:06 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>
Cc:     Andy Gross <agross@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sc8280xp: fix UFS DMA coherency



On 05/12/2022 11:08, Johan Hovold wrote:
> The SC8280XP UFS controllers are cache coherent and must be marked as
> such in the devicetree to avoid potential data corruption.
> 
> Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
> Cc: stable@...r.kernel.org      # 6.0
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>   arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> index c4947c563099..23d1f51527aa 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> @@ -1430,6 +1430,7 @@ ufs_mem_hc: ufs@...4000 {
>   			required-opps = <&rpmhpd_opp_nom>;
>   
>   			iommus = <&apps_smmu 0xe0 0x0>;
> +			dma-coherent;
>   
>   			clocks = <&gcc GCC_UFS_PHY_AXI_CLK>,
>   				 <&gcc GCC_AGGRE_UFS_PHY_AXI_CLK>,
> @@ -1491,6 +1492,7 @@ ufs_card_hc: ufs@...4000 {
>   			power-domains = <&gcc UFS_CARD_GDSC>;
>   
>   			iommus = <&apps_smmu 0x4a0 0x0>;
> +			dma-coherent;
>   
>   			clocks = <&gcc GCC_UFS_CARD_AXI_CLK>,
>   				 <&gcc GCC_AGGRE_UFS_CARD_AXI_CLK>,