linux-kernel - [PATCH 3/3] arm64: dts: qcom: sm8650: Fix the msi-map entries

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Date: Mon, 18 Mar 2024 12:49:05 +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>
Subject: [PATCH 3/3] arm64: dts: qcom: sm8650: 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.

Fixes: a33a532b3b1e ("arm64: dts: qcom: sm8650: Use GIC-ITS for PCIe0 and PCIe1")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 arch/arm64/boot/dts/qcom/sm8650.dtsi | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
index ba72d8f38420..eb117866e59f 100644
--- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
@@ -2274,9 +2274,8 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
 			interrupt-map-mask = <0 0 0 0x7>;
 			#interrupt-cells = <1>;
 
-			/* 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>;
 			msi-map-mask = <0xff00>;
 
 			linux,pci-domain = <0>;
@@ -2402,9 +2401,8 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
 			interrupt-map-mask = <0 0 0 0x7>;
 			#interrupt-cells = <1>;
 
-			/* 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>;
 			msi-map-mask = <0xff00>;
 
 			linux,pci-domain = <1>;

-- 
2.25.1