linux-kernel - [PATCH RFC 11/11] arm64: dts: qcom: x1e80100: Affirm IDR0.CCTW on apps

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Message-Id: <20240919-topic-apps_smmu_coherent-v1-11-5b3a8662403d@quicinc.com>
Date: Thu, 19 Sep 2024 00:57:24 +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 11/11] arm64: dts: qcom: x1e80100: 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/x1e80100.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
index a36076e3c56b5b8815eb41ec55e2e1e5bd878201..d364d5ebdaaf6aa1935d42e49819b02e03e32fe9 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
@@ -5738,6 +5738,8 @@ apps_smmu: iommu@...00000 {
 
 			#iommu-cells = <2>;
 			#global-interrupts = <1>;
+
+			dma-coherent;
 		};
 
 		intc: interrupt-controller@...00000 {

-- 
2.46.1