Re: [PATCH v2] arm64: dts: qcom: agatti: enable FastRPC on the ADSP

[Sumit Garg <sumit.garg@kernel.org>]

On Tue, Jan 13, 2026 at 06:41:59PM +0200, Dmitry Baryshkov wrote:
> On Agatti platform the ADSP provides FastRPC support. Add corresponding
> device node, in order to be able to utilize the DSP offload from the
> Linux side.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
> Changes in v2:
> - Add more FastRPC context banks (6, 7)
> - Link to v1: https://lore.kernel.org/r/20260113-agatti-fastrpc-v1-1-e210903ffcb1@oss.qualcomm.com
> ---
>  arch/arm64/boot/dts/qcom/agatti.dtsi | 41 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>

This patch causes a critical boot regression on RB1 as per the CI test
report here [1]. I see this change already landed in this merge window.
So, either this commit has to be reverted for v7.0 release or an
appropriate fix is required.

[1] https://github.com/qualcomm-linux/kernel/issues/359

-Sumit

> diff --git a/arch/arm64/boot/dts/qcom/agatti.dtsi b/arch/arm64/boot/dts/qcom/agatti.dtsi
> index 7815ece261ea..217d465df846 100644
> --- a/arch/arm64/boot/dts/qcom/agatti.dtsi
> +++ b/arch/arm64/boot/dts/qcom/agatti.dtsi
> @@ -2287,6 +2287,47 @@ q6routing: routing {
>  						};
>  					};
>  				};
> +
> +				fastrpc {
> +					compatible = "qcom,fastrpc";
> +					qcom,glink-channels = "fastrpcglink-apps-dsp";
> +					label = "adsp";
> +
> +					qcom,non-secure-domain;
> +
> +					#address-cells = <1>;
> +					#size-cells = <0>;
> +
> +					compute-cb@3 {
> +						compatible = "qcom,fastrpc-compute-cb";
> +						reg = <3>;
> +						iommus = <&apps_smmu 0x1c3 0x0>;
> +					};
> +
> +					compute-cb@4 {
> +						compatible = "qcom,fastrpc-compute-cb";
> +						reg = <4>;
> +						iommus = <&apps_smmu 0x1c4 0x0>;
> +					};
> +
> +					compute-cb@5 {
> +						compatible = "qcom,fastrpc-compute-cb";
> +						reg = <5>;
> +						iommus = <&apps_smmu 0x1c5 0x0>;
> +					};
> +
> +					compute-cb@6 {
> +						compatible = "qcom,fastrpc-compute-cb";
> +						reg = <6>;
> +						iommus = <&apps_smmu 0x1c6 0x0>;
> +					};
> +
> +					compute-cb@7 {
> +						compatible = "qcom,fastrpc-compute-cb";
> +						reg = <7>;
> +						iommus = <&apps_smmu 0x1c7 0x0>;
> +					};
> +				};
>  			};
>  		};
>  
> 
> ---
> base-commit: 0f853ca2a798ead9d24d39cad99b0966815c582a
> change-id: 20260113-agatti-fastrpc-e3fe4bea2b42
> 
> Best regards,
> -- 
> With best wishes
> Dmitry
> 
>