linux-kernel - [PATCH 1/3] arm64: dts: qcom: sm8450: Fix the msi-map entries

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Message-Id: <20240318-pci-bdf-sid-fix-v1-1-acca6c5d9cf1@linaro.org>
Date: Mon, 18 Mar 2024 12:49:03 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: 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>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 stable@...r.kernel.org
Subject: [PATCH 1/3] arm64: dts: qcom: sm8450: Fix the msi-map entries

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.

Cc: <stable@...r.kernel.org> # 6.3: bf79e33cdd89 ("PCI: qcom: Enable BDF to SID translation properly")
Fixes: ff384ab56f16 ("arm64: dts: qcom: sm8450: Use GIC-ITS for PCIe0 and PCIe1")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 arch/arm64/boot/dts/qcom/sm8450.dtsi | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
index b86be34a912b..024d2653cc30 100644
--- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
@@ -1777,12 +1777,8 @@ pcie0: pcie@...0000 {
 			ranges = <0x01000000 0x0 0x00000000 0x0 0x60200000 0x0 0x100000>,
 				 <0x02000000 0x0 0x60300000 0x0 0x60300000 0x0 0x3d00000>;
 
-			/*
-			 * MSIs for BDF (1:0.0) only works with Device ID 0x5980.
-			 * Hence, the IDs are swapped.
-			 */
-			msi-map = <0x0 &gic_its 0x5981 0x1>,
-				  <0x100 &gic_its 0x5980 0x1>;
+			msi-map = <0x0 &gic_its 0x5980 0x1>,
+				  <0x100 &gic_its 0x5981 0x1>;
 			msi-map-mask = <0xff00>;
 			interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>,
@@ -1900,12 +1896,8 @@ pcie1: pcie@...8000 {
 			ranges = <0x01000000 0x0 0x00000000 0x0 0x40200000 0x0 0x100000>,
 				 <0x02000000 0x0 0x40300000 0x0 0x40300000 0x0 0x1fd00000>;
 
-			/*
-			 * MSIs for BDF (1:0.0) only works with Device ID 0x5a00.
-			 * Hence, the IDs are swapped.
-			 */
-			msi-map = <0x0 &gic_its 0x5a01 0x1>,
-				  <0x100 &gic_its 0x5a00 0x1>;
+			msi-map = <0x0 &gic_its 0x5a00 0x1>,
+				  <0x100 &gic_its 0x5a01 0x1>;
 			msi-map-mask = <0xff00>;
 			interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>,

-- 
2.25.1