arm64: dts: qcom: sc8180x: Affirm IDR0.CCTW on apps_smmu

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>
Tested-by: Steev Klimaszewski <steev@kali.org> # Thinkpad X13s (sc8280xp)
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on sdm845-rb3
Link: https://lore.kernel.org/r/20240919-topic-apps_smmu_coherent-v1-3-5b3a8662403d@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sc8180x.dtsi b/arch/arm64/boot/dts/qcom/sc8180x.dtsi
index 0e9429684dd97bc2d93185815b29e9db0fad892b..e80e0d3b77329836ec3c97e707c5659b9ad83325 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sc8180x.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8180x.dtsi
@@ -3662,7 +3662,7 @@
                                     <GIC_SPI 773 IRQ_TYPE_LEVEL_HIGH>,
                                     <GIC_SPI 774 IRQ_TYPE_LEVEL_HIGH>,
                                     <GIC_SPI 775 IRQ_TYPE_LEVEL_HIGH>;
-
+                       dma-coherent;
                };
 
                remoteproc_adsp: remoteproc@17300000 {