linux-kernel - Re: [PATCH 13/13] arm64: dts: qcom: sc7280: Add cpuidle states

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Message-ID: <161406655568.1254594.10659725128997811651@swboyd.mtv.corp.google.com>
Date:   Mon, 22 Feb 2021 23:49:15 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Maulik Shah <mkshah@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH 13/13] arm64: dts: qcom: sc7280: Add cpuidle states

Quoting Rajendra Nayak (2021-02-11 23:28:50)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 8f2002b..3b86052 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -186,12 +207,69 @@
>                         compatible = "arm,kryo";
>                         reg = <0x0 0x700>;
>                         enable-method = "psci";
> +                       cpu-idle-states = <&BIG_CPU_SLEEP_0
> +                                          &BIG_CPU_SLEEP_1
> +                                          &CLUSTER_SLEEP_0>;
>                         next-level-cache = <&L2_700>;
>                         L2_700: l2-cache {
>                                 compatible = "cache";
>                                 next-level-cache = <&L3_0>;
>                         };
>                 };
> +
> +               idle-states {
> +                       entry-method = "psci";
> +
> +                       LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 {
> +                               compatible = "arm,idle-state";
> +                               idle-state-name = "little-power-down";
> +                               arm,psci-suspend-param = <0x40000003>;
> +                               entry-latency-us = <549>;
> +                               exit-latency-us = <901>;
> +                               min-residency-us = <1774>;

Are these preliminary numbers? They're the same as sc7180 from what I
can tell, but presumably things changed between SoC versions?

> +                               local-timer-stop;
> +                       };
> +
> +                       LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 {
> +                               compatible = "arm,idle-state";
> +                               idle-state-name = "little-rail-power-down";
> +                               arm,psci-suspend-param = <0x40000004>;
> +                               entry-latency-us = <702>;
> +                               exit-latency-us = <915>;
> +                               min-residency-us = <4001>;
> +                               local-timer-stop;
> +                       };
> +
> +                       BIG_CPU_SLEEP_0: cpu-sleep-1-0 {
> +                               compatible = "arm,idle-state";
> +                               idle-state-name = "big-power-down";
> +                               arm,psci-suspend-param = <0x40000003>;
> +                               entry-latency-us = <523>;
> +                               exit-latency-us = <1244>;
> +                               min-residency-us = <2207>;