linux-kernel - Re: [PATCH v2] arm64: dts: qcom: qcm2290: Add CPU idle states

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Date:   Wed, 7 Jun 2023 22:13:30 +0200
From:   Stephan Gerhold <stephan@...hold.net>
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>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: qcm2290: Add CPU idle states

On Wed, Jun 07, 2023 at 01:04:19AM +0200, Konrad Dybcio wrote:
> Add the (scarce) idle states for the individual CPUs, as well as the
> whole cluster. This enables deeper-than-WFI cpuidle
                                                     .
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

FWIW:

Reviewed-by: Stephan Gerhold <stephan@...hold.net>

> ---
> Changes in v2:
> - Add missing BIT(24) ("last in power level")
> - Use the correct CPU low-power state (0x3 instead of 0x4)
> - Link to v1: https://lore.kernel.org/r/20230606-topic-qcm2290_idlestates-v1-1-dd77eef0086e@linaro.org
> ---
>  arch/arm64/boot/dts/qcom/qcm2290.dtsi | 61 +++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcm2290.dtsi b/arch/arm64/boot/dts/qcom/qcm2290.dtsi
> index b29bc4e4b837..0ed11e80e5e2 100644
> --- a/arch/arm64/boot/dts/qcom/qcm2290.dtsi
> +++ b/arch/arm64/boot/dts/qcom/qcm2290.dtsi
> @@ -48,6 +48,8 @@ CPU0: cpu@0 {
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
>  			qcom,freq-domain = <&cpufreq_hw 0>;
> +			power-domains = <&CPU_PD0>;
> +			power-domain-names = "psci";
>  			L2_0: l2-cache {
>  				compatible = "cache";
>  				cache-level = <2>;
> @@ -65,6 +67,8 @@ CPU1: cpu@1 {
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
>  			qcom,freq-domain = <&cpufreq_hw 0>;
> +			power-domains = <&CPU_PD1>;
> +			power-domain-names = "psci";
>  		};
>  
>  		CPU2: cpu@2 {
> @@ -77,6 +81,8 @@ CPU2: cpu@2 {
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
>  			qcom,freq-domain = <&cpufreq_hw 0>;
> +			power-domains = <&CPU_PD2>;
> +			power-domain-names = "psci";
>  		};
>  
>  		CPU3: cpu@3 {
> @@ -89,6 +95,8 @@ CPU3: cpu@3 {
>  			enable-method = "psci";
>  			next-level-cache = <&L2_0>;
>  			qcom,freq-domain = <&cpufreq_hw 0>;
> +			power-domains = <&CPU_PD3>;
> +			power-domain-names = "psci";
>  		};
>  
>  		cpu-map {
> @@ -110,6 +118,30 @@ core3 {
>  				};
>  			};
>  		};
> +
> +		domain-idle-states {
> +			CLUSTER_SLEEP: cluster-sleep-0 {
> +				compatible = "domain-idle-state";
> +				arm,psci-suspend-param = <0x41000043>;
> +				entry-latency-us = <800>;
> +				exit-latency-us = <2118>;
> +				min-residency-us = <7376>;
> +			};
> +		};
> +
> +		idle-states {
> +			entry-method = "psci";
> +
> +			CPU_SLEEP: cpu-sleep-0 {
> +				compatible = "arm,idle-state";
> +				idle-state-name = "power-collapse";
> +				arm,psci-suspend-param = <0x40000003>;
> +				entry-latency-us = <290>;
> +				exit-latency-us = <376>;
> +				min-residency-us = <1182>;
> +				local-timer-stop;
> +			};
> +		};
>  	};
>  
>  	firmware {
> @@ -135,6 +167,35 @@ pmu {
>  	psci {
>  		compatible = "arm,psci-1.0";
>  		method = "smc";
> +
> +		CPU_PD0: power-domain-cpu0 {
> +			#power-domain-cells = <0>;
> +			power-domains = <&CLUSTER_PD>;
> +			domain-idle-states = <&CPU_SLEEP>;
> +		};
> +
> +		CPU_PD1: power-domain-cpu1 {
> +			#power-domain-cells = <0>;
> +			power-domains = <&CLUSTER_PD>;
> +			domain-idle-states = <&CPU_SLEEP>;
> +		};
> +
> +		CPU_PD2: power-domain-cpu2 {
> +			#power-domain-cells = <0>;
> +			power-domains = <&CLUSTER_PD>;
> +			domain-idle-states = <&CPU_SLEEP>;
> +		};
> +
> +		CPU_PD3: power-domain-cpu3 {
> +			#power-domain-cells = <0>;
> +			power-domains = <&CLUSTER_PD>;
> +			domain-idle-states = <&CPU_SLEEP>;
> +		};
> +
> +		CLUSTER_PD: power-domain-cpu-cluster {
> +			#power-domain-cells = <0>;
> +			domain-idle-states = <&CLUSTER_SLEEP>;
> +		};
>  	};
>  
>  	reserved_memory: reserved-memory {
> 
> ---
> base-commit: 6db29e14f4fb7bce9eb5290288e71b05c2b0d118
> change-id: 20230606-topic-qcm2290_idlestates-5b6062b0f4c6
> 
> Best regards,
> -- 
> Konrad Dybcio <konrad.dybcio@...aro.org>
>