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[RFC,11/11] arm64: dts: qcom: x1e80100: Affirm IDR0.CCTW on apps_smmu

Message ID 20240919-topic-apps_smmu_coherent-v1-11-5b3a8662403d@quicinc.com (mailing list archive)
State New
Headers show
Series Affirm SMMU coherent pagetable walker capability on RPMh SoCs | expand

Commit Message

Konrad Dybcio Sept. 18, 2024, 10:57 p.m. UTC 
From: Konrad Dybcio <quic_kdybcio@quicinc.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@quicinc.com>
---
 arch/arm64/boot/dts/qcom/x1e80100.dtsi | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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@15000000 {
 
 			#iommu-cells = <2>;
 			#global-interrupts = <1>;
+
+			dma-coherent;
 		};
 
 		intc: interrupt-controller@17000000 {