linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: sm8550: Fix the msi-map entries

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Message-ID: <869e106f-b953-4615-8dc2-bf200af6f3d9@linaro.org>
Date: Mon, 18 Mar 2024 09:52:26 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] arm64: dts: qcom: sm8550: Fix the msi-map entries

On 18/03/2024 08:19, Manivannan Sadhasivam wrote:
> While adding the GIC ITS MSI support, it was found that the msi-map entries
> needed to be swapped to receive MSIs from the endpoint.
> 
> But later it was identified that the swapping was needed due to a bug in
> the Qualcomm PCIe controller driver. And since the bug is now fixed with
> commit bf79e33cdd89 ("PCI: qcom: Enable BDF to SID translation properly"),
> let's fix the msi-map entries also to reflect the actual mapping in the
> hardware.
> 
> Fixes: 114990ce3edf ("arm64: dts: qcom: sm8550: Use GIC-ITS for PCIe0 and PCIe1")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   arch/arm64/boot/dts/qcom/sm8550.dtsi | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> index 3904348075f6..3348bc06db48 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> @@ -1755,9 +1755,8 @@ pcie0: pcie@...0000 {
>   					<&gem_noc MASTER_APPSS_PROC 0 &cnoc_main SLAVE_PCIE_0 0>;
>   			interconnect-names = "pcie-mem", "cpu-pcie";
>   
> -			/* Entries are reversed due to the unusual ITS DeviceID encoding */
> -			msi-map = <0x0 &gic_its 0x1401 0x1>,
> -				  <0x100 &gic_its 0x1400 0x1>;
> +			msi-map = <0x0 &gic_its 0x1400 0x1>,
> +				  <0x100 &gic_its 0x1401 0x1>;
>   			iommu-map = <0x0   &apps_smmu 0x1400 0x1>,
>   				    <0x100 &apps_smmu 0x1401 0x1>;
>   
> @@ -1867,9 +1866,8 @@ pcie1: pcie@...8000 {
>   					<&gem_noc MASTER_APPSS_PROC 0 &cnoc_main SLAVE_PCIE_1 0>;
>   			interconnect-names = "pcie-mem", "cpu-pcie";
>   
> -			/* Entries are reversed due to the unusual ITS DeviceID encoding */
> -			msi-map = <0x0 &gic_its 0x1481 0x1>,
> -				  <0x100 &gic_its 0x1480 0x1>;
> +			msi-map = <0x0 &gic_its 0x1480 0x1>,
> +				  <0x100 &gic_its 0x1481 0x1>;
>   			iommu-map = <0x0   &apps_smmu 0x1480 0x1>,
>   				    <0x100 &apps_smmu 0x1481 0x1>;
>   
> 

Acked-by: Neil Armstrong <neil.armstrong@...aro.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8550-QRD