The FastRPC context banks are DMA-coherent on sc8280xp platform. Mark them
as such.

This allows running AI applications on the CDSP using the Qualcomm AI
Runtime (QAIRT) SDK on the sc8280xp platform.

Signed-off-by: Xilin Wu <sophon@radxa.com>
---
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index 761f229e8f47..480cb85b5792 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -2910,18 +2910,21 @@ compute-cb@1 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <1>;
 						iommus = <&apps_smmu 0x0521 0x0>;
+						dma-coherent;
 					};
 
 					compute-cb@2 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <2>;
 						iommus = <&apps_smmu 0x0522 0x0>;
+						dma-coherent;
 					};
 
 					compute-cb@3 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <3>;
 						iommus = <&apps_smmu 0x0523 0x0>;
+						dma-coherent;
 					};
 				};
 			};
@@ -6029,84 +6032,98 @@ compute-cb@1 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <1>;
 						iommus = <&apps_smmu 0x3181 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@2 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <2>;
 						iommus = <&apps_smmu 0x3182 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@3 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <3>;
 						iommus = <&apps_smmu 0x3183 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@4 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <4>;
 						iommus = <&apps_smmu 0x3184 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@5 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <5>;
 						iommus = <&apps_smmu 0x3185 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@6 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <6>;
 						iommus = <&apps_smmu 0x3186 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@7 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <7>;
 						iommus = <&apps_smmu 0x3187 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@8 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <8>;
 						iommus = <&apps_smmu 0x3188 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@9 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <9>;
 						iommus = <&apps_smmu 0x318b 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@10 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <10>;
 						iommus = <&apps_smmu 0x318b 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@11 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <11>;
 						iommus = <&apps_smmu 0x318c 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@12 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <12>;
 						iommus = <&apps_smmu 0x318d 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@13 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <13>;
 						iommus = <&apps_smmu 0x318e 0x0420>;
+						dma-coherent;
 					};
 
 					compute-cb@14 {
 						compatible = "qcom,fastrpc-compute-cb";
 						reg = <14>;
 						iommus = <&apps_smmu 0x318f 0x0420>;
+						dma-coherent;
 					};
 				};
 			};

---
base-commit: 735d2f48cadaa9a87e7c7601667878de70c771c5
change-id: 20260507-sc8280xp-fastrpc-dma-coherent-460cefa58dbb

Best regards,
--  
Xilin Wu <sophon@radxa.com>

On 5/7/26 4:50 PM, Xilin Wu wrote:
> The FastRPC context banks are DMA-coherent on sc8280xp platform. Mark them
> as such.
> 
> This allows running AI applications on the CDSP using the Qualcomm AI
> Runtime (QAIRT) SDK on the sc8280xp platform.
> 
> Signed-off-by: Xilin Wu <sophon@radxa.com>
> ---

Did you test it with/without this patch?

Konrad