linux-kernel - Re: [PATCH 6/8] arm64: dts: qcom: sdm845: Flush RSC sleep & wake votes

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Date:   Wed, 31 May 2023 13:49:01 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Melody Olvera <quic_molvera@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>,
        Richard Acayan <mailingradian@...il.com>,
        Lina Iyer <ilina@...eaurora.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        Sai Prakash Ranjan <quic_saipraka@...cinc.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Luca Weiss <luca.weiss@...rphone.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Gross <andy.gross@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH 6/8] arm64: dts: qcom: sdm845: Flush RSC sleep & wake votes

Hi,

On Wed, May 31, 2023 at 6:22 AM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> The rpmh driver will cache sleep and wake votes until the cluster
> power-domain is about to enter idle, to avoid unnecessary writes. So
> associate the apps_rsc with the cluster pd, so that it can be notified
> about this event.
>
> Without this, only AMC votes are being commited.
>
> Fixes: c83545d95376 ("arm64: dts: sdm845: Add rpmh-rsc node")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 950305aad44d..707550ef4990 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -5138,6 +5138,7 @@ apps_rsc: rsc@...c0000 {
>                                           <SLEEP_TCS   3>,
>                                           <WAKE_TCS    3>,
>                                           <CONTROL_TCS 1>;
> +                       power-domains = <&CLUSTER_PD>;

It would be good to confirm that this doesn't throw sdm845-cheza for a
loop. No sdm845 Chromebooks ever officially shipped, but some people
like Rob Clark still use the old boards in their CI farms. Adding him
here in case he wants to check. Worst case we could just delete the
property from the cheza device tree.

-Doug