linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs404: Add PSCI cpuidle support

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Message-ID: <CAP245DXLHqU3tv5cii=Z1G4J5m=Emy7yiHP=zSTpY6GX02NKcg@mail.gmail.com>
Date:   Wed, 8 May 2019 02:48:19 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Niklas Cassel <niklas.cassel@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: qcs404: Add PSCI cpuidle support

On Tue, May 7, 2019 at 1:01 AM Niklas Cassel <niklas.cassel@...aro.org> wrote:
>
> Add device bindings for CPUs to suspend using PSCI as the enable-method.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/qcs404.dtsi | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/qcs404.dtsi b/arch/arm64/boot/dts/qcom/qcs404.dtsi
> index ffedf9640af7..f9db9f3ee10c 100644
> --- a/arch/arm64/boot/dts/qcom/qcs404.dtsi
> +++ b/arch/arm64/boot/dts/qcom/qcs404.dtsi
> @@ -31,6 +31,7 @@
>                         reg = <0x100>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       cpu-idle-states = <&CPU_PC>;
>                 };
>
>                 CPU1: cpu@101 {
> @@ -39,6 +40,7 @@
>                         reg = <0x101>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       cpu-idle-states = <&CPU_PC>;
>                 };
>
>                 CPU2: cpu@102 {
> @@ -47,6 +49,7 @@
>                         reg = <0x102>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       cpu-idle-states = <&CPU_PC>;
>                 };
>
>                 CPU3: cpu@103 {
> @@ -55,12 +58,24 @@
>                         reg = <0x103>;
>                         enable-method = "psci";
>                         next-level-cache = <&L2_0>;
> +                       cpu-idle-states = <&CPU_PC>;
>                 };
>
>                 L2_0: l2-cache {
>                         compatible = "cache";
>                         cache-level = <2>;
>                 };
> +
> +               idle-states {

entry-method="psci" property goes here. I have a patch fixing it for 410c ;-)

I don't think the psci_cpuidle_ops will even get called without this.
Did you see any changes in consumption with this patch? I was trying
to measure that before sending this out.

> +                       CPU_PC: pc {
> +                               compatible = "arm,idle-state";
> +                               arm,psci-suspend-param = <0x40000003>;
> +                               entry-latency-us = <125>;
> +                               exit-latency-us = <180>;
> +                               min-residency-us = <595>;
> +                               local-timer-stop;
> +                       };
> +               };
>         };
>
>         firmware {
> --
> 2.21.0
>