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[RFC,05/11] arm64: dts: qcom: sdm670: Affirm IDR0.CCTW on apps_smmu

Message ID 20240919-topic-apps_smmu_coherent-v1-5-5b3a8662403d@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/sdm670.dtsi | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm64/boot/dts/qcom/sdm670.dtsi b/arch/arm64/boot/dts/qcom/sdm670.dtsi
index 187c6698835d34e617aeb83309b6d5926eb57198..a08a64bc033ffdea283645c6bf4ed835a59c3366 100644
--- a/arch/arm64/boot/dts/qcom/sdm670.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm670.dtsi
@@ -1737,6 +1737,7 @@  apps_smmu: iommu@15000000 {
 				     <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 342 IRQ_TYPE_LEVEL_HIGH>,
 				     <GIC_SPI 343 IRQ_TYPE_LEVEL_HIGH>;
+			dma-coherent;
 		};
 
 		gladiator_noc: interconnect@17900000 {