linux-kernel - [PATCH RFC 10/11] arm64: dts: qcom: sm8450: Affirm IDR0.CCTW on apps

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Message-Id: <20240919-topic-apps_smmu_coherent-v1-10-5b3a8662403d@quicinc.com>
Date: Thu, 19 Sep 2024 00:57:23 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, cros-qcom-dts-watchers@...omium.org
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Konrad Dybcio <quic_kdybcio@...cinc.com>
Subject: [PATCH RFC 10/11] arm64: dts: qcom: sm8450: Affirm IDR0.CCTW on
 apps_smmu

From: Konrad Dybcio <quic_kdybcio@...cinc.com>

On RPMh-based SoCs, the APPS SMMU advertizes support for cache-coherent
pagetable walk via the IDR0 register. This however is not respected by
the arm-smmu driver unless dma-coherent is set.

Mark the node as dma-coherent to ensure this (and other) implementations
take this coherency into account.

Signed-off-by: Konrad Dybcio <quic_kdybcio@...cinc.com>
---
 arch/arm64/boot/dts/qcom/sm8450.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
index 9bafb3b350ff627277514be83910b72a283c1935..a22112cb4bb5ba2f20e45f8136d9ec2d75dd7571 100644
--- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
@@ -4257,6 +4257,7 @@ apps_smmu: iommu@...00000 {
 				     <GIC_SPI 695 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 696 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 697 IRQ_TYPE_LEVEL_HIGH>;
+			dma-coherent;
 		};
 
 		intc: interrupt-controller@...00000 {

-- 
2.46.1