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List:       linux-pci
Subject:    Re: [PATCH V1] arm64:dts:qcom:sc7280: mark memory of PCIe as cache coherent
From:       Manivannan Sadhasivam <manivannan.sadhasivam () linaro ! org>
Date:       2023-02-27 13:44:41
Message-ID: 20230227133241.GA3647 () thinkpad
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Please fix the subject as:

arm64: dts: qcom: sc7280: Mark PCIe controller as cache coherent

On Mon, Feb 27, 2023 at 03:06:15PM +0530, Krishna chaitanya chundru wrote:
> Mark the PCIe node as dma-coherent as the devices on PCIe bus are
> cache coherent.
> 

But this is a bug fix actually. If the controller is not marked as cache
coherent, then kernel will try to ensure coherency during dma-ops and that may
cause data corruption.

So please add fixes tag and CC stable.

Thanks,
Mani

> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index bdcb749..8f4ab6b 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -2131,6 +2131,8 @@
>  			pinctrl-names = "default";
>  			pinctrl-0 = <&pcie1_clkreq_n>;
>  
> +			dma-coherent;
> +
>  			iommus = <&apps_smmu 0x1c80 0x1>;
>  
>  			iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
> -- 
> 2.7.4
> 

-- 
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