linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p: Remove cdsp compute-cb@10

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Message-ID: <i65z3bpnhsqx2cg4ga5lampicdpydtqwkbpr45kfpc5xg7eydv@kaw7aenrcy3g>
Date: Thu, 23 Jan 2025 12:32:04 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ling Xu <quic_lxu5@...cinc.com>
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, quic_kuiw@...cinc.com, 
	quic_ekangupt@...cinc.com, quic_kartsana@...cinc.com, kernel@...cinc.com, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...nel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p: Remove cdsp
 compute-cb@10

On Thu, Jan 23, 2025 at 02:49:28PM +0530, Ling Xu wrote:
> Need to remove the context bank compute-cb@10 because secure cdsp
> uses the s2-only stream.

This doesn't tell us anything. is cb@10 secure (it isn't marked this
way), are those SMMU ids incorrect? Or are they S2-only? Or something
else?

> 
> Fixes: f7b01bfb4b47 ("arm64: qcom: sa8775p: Add ADSP and CDSP0 fastrpc nodes")
> Cc: stable@...nel.org
> Signed-off-by: Karthik Sanagavarapu <quic_kartsana@...cinc.com>
> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sa8775p.dtsi | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> index 0aa27db21f3d..81b2fba94841 100644
> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> @@ -4585,14 +4585,6 @@ compute-cb@9 {
>  						dma-coherent;
>  					};
>  
> -					compute-cb@10 {
> -						compatible = "qcom,fastrpc-compute-cb";
> -						reg = <10>;
> -						iommus = <&apps_smmu 0x214a 0x04a0>,
> -							 <&apps_smmu 0x218a 0x0400>;
> -						dma-coherent;
> -					};
> -
>  					compute-cb@11 {
>  						compatible = "qcom,fastrpc-compute-cb";
>  						reg = <11>;
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry