linux-kernel - Re: [PATCH v4 1/2] arm64: dts: qcom: sc7280: Add memory region for audiopd

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Message-ID: <ucgmkx5fhwf4tc634gexj4usgzdme7aj44qup5qo4fpolnixm3@dgghylexk36y>
Date: Mon, 11 Aug 2025 13:43:53 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Ling Xu <quic_lxu5@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, quic_kuiw@...cinc.com,
        ekansh.gupta@....qualcomm.com, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] arm64: dts: qcom: sc7280: Add memory region for
 audiopd

On Tue, Jul 01, 2025 at 02:19:04PM +0530, Ling Xu wrote:
> Add reserved memory region and VMIDs for audio PD dynamic loading and
> remote heap memory requirements. This is required in use cases such as
> audio compressed offload. For example, playback of compressed formats
> like MP3 need audio PD support.
> 
> Co-developed-by: Ekansh Gupta <ekansh.gupta@....qualcomm.com>
> Signed-off-by: Ekansh Gupta <ekansh.gupta@....qualcomm.com>
> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 64a2abd30100..b1def5611764 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -189,6 +189,14 @@ rmtfs_mem: rmtfs@...00000 {
>  			qcom,client-id = <1>;
>  			qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>;
>  		};
> +
> +		adsp_rpc_remote_heap_mem: adsp-rpc-remote-heap {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x800000>;
> +			alignment = <0x0 0x100000>;
> +			alloc-ranges = <0x0 0x80000000 0x0 0x40000000>;
> +			no-map;
> +		};
>  	};
>  
>  	cpus {
> @@ -3907,6 +3915,9 @@ fastrpc {
>  					qcom,glink-channels = "fastrpcglink-apps-dsp";
>  					label = "adsp";
>  					qcom,non-secure-domain;
> +					memory-region = <&adsp_rpc_remote_heap_mem>;
> +					qcom,vmids = <QCOM_SCM_VMID_LPASS>,
> +						     <QCOM_SCM_VMID_ADSP_HEAP>;

We should stop defining VMIDs in the DT and use label to determine them
instead.

>  					#address-cells = <1>;
>  					#size-cells = <0>;
>  
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry