linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180: Add cpuidle low power states

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Message-ID: <20200121234452.GW89495@google.com>
Date:   Tue, 21 Jan 2020 15:44:52 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     agross@...nel.org, robh+dt@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rnayak@...eaurora.org, ilina@...eaurora.org, lsrao@...eaurora.org,
        swboyd@...omium.org, evgreen@...omium.org, dianders@...omium.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Add cpuidle low power states

Hi Maulik,

what is the state of this patch? Sudeep and Stephen had comments requesting
minor changes, do you plan to send a v2 soon?

Thanks

Matthias

On Wed, Oct 30, 2019 at 09:35:18AM +0530, Maulik Shah wrote:
> Add device bindings for cpuidle states for cpu devices.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 78 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 78 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index fceac50..69d5e2c 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -70,6 +70,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x0>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_0>;
>  			L2_0: l2-cache {
>  				compatible = "cache";
> @@ -85,6 +88,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x100>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_100>;
>  			L2_100: l2-cache {
>  				compatible = "cache";
> @@ -97,6 +103,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x200>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_200>;
>  			L2_200: l2-cache {
>  				compatible = "cache";
> @@ -109,6 +118,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x300>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_300>;
>  			L2_300: l2-cache {
>  				compatible = "cache";
> @@ -121,6 +133,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x400>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_400>;
>  			L2_400: l2-cache {
>  				compatible = "cache";
> @@ -133,6 +148,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x500>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&LITTLE_CPU_SLEEP_0
> +					   &LITTLE_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_500>;
>  			L2_500: l2-cache {
>  				compatible = "cache";
> @@ -145,6 +163,9 @@
>  			compatible = "arm,armv8";
>  			reg = <0x0 0x600>;
>  			enable-method = "psci";
> +			cpu-idle-states = <&BIG_CPU_SLEEP_0
> +					   &BIG_CPU_SLEEP_1
> +					   &CLUSTER_SLEEP_0>;
>  			next-level-cache = <&L2_600>;
>  			L2_600: l2-cache {
>  				compatible = "cache";
> @@ -157,12 +178,69 @@
>  			compatible = "arm,armv8";
>  			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 = <350>;
> +				exit-latency-us = <461>;
> +				min-residency-us = <1890>;
> +				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 = <360>;
> +				exit-latency-us = <531>;
> +				min-residency-us = <3934>;
> +				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 = <264>;
> +				exit-latency-us = <621>;
> +				min-residency-us = <952>;
> +				local-timer-stop;
> +			};
> +
> +			BIG_CPU_SLEEP_1: cpu-sleep-1-1 {
> +				compatible = "arm,idle-state";
> +				idle-state-name = "big-rail-power-down";
> +				arm,psci-suspend-param = <0x40000004>;
> +				entry-latency-us = <702>;
> +				exit-latency-us = <1061>;
> +				min-residency-us = <4488>;
> +				local-timer-stop;
> +			};
> +
> +			CLUSTER_SLEEP_0: cluster-sleep-0 {
> +				compatible = "arm,idle-state";
> +				idle-state-name = "cluster-power-down";
> +				arm,psci-suspend-param = <0x400000F4>;
> +				entry-latency-us = <3263>;
> +				exit-latency-us = <6562>;
> +				min-residency-us = <9987>;
> +				local-timer-stop;
> +			};
> +		};
>  	};
>  
>  	memory@...00000 {
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>