linux-kernel - Re: [PATCH] arm64: dts: msm8996: fix PSCI entry-latency-us

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Date:   Fri, 7 Jun 2019 20:50:42 -0700
From:   Bjorn Andersson <bjorn.andersson@...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>, amit.kucheria@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: msm8996: fix PSCI entry-latency-us

On Tue 04 Jun 05:29 PDT 2019, Niklas Cassel wrote:

> The current entry-latency-us is too short.
> The proper way to convert between the device tree properties
> from the vendor tree to the upstream PSCI device tree properties is:
> 
> entry-latency-us = qcom,time-overhead - qcom,latency-us
> 
> which gives
> 
> entry-latency-us = 210 - 80 = 130
> 
> Fixes: f6aee7af59b6 ("arm64: dts: qcom: msm8996: Add PSCI cpuidle low power states")
> Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>

Thanks Niklas

Applied,
Bjorn

> ---
>  arch/arm64/boot/dts/qcom/msm8996.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> index b7cf2a17dcb5..e8c03b5c8990 100644
> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> @@ -174,7 +174,7 @@
>  				compatible = "arm,idle-state";
>  				idle-state-name = "standalone-power-collapse";
>  				arm,psci-suspend-param = <0x00000004>;
> -				entry-latency-us = <40>;
> +				entry-latency-us = <130>;
>  				exit-latency-us = <80>;
>  				min-residency-us = <300>;
>  			};
> -- 
> 2.21.0
>