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

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Date:   Tue, 7 May 2019 12:36:14 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Niklas Cassel <niklas.cassel@...aro.org>,
        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,
        jorge.ramirez-ortiz@...aro.org, lina.iyer@...aro.org,
        ulf.hansson@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: qcs404: Add PSCI cpuidle support

On 06-05-19, 23:55, Bjorn Andersson wrote:
> On Mon 06 May 22:35 PDT 2019, Vinod Koul wrote:
> 
> > On 06-05-19, 21:31, Niklas Cassel 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 {
> > 
> > Since we are trying to sort the file per address and
> > alphabetically, it would be great if this can be moved before l2-cache
> > :)
> > 
> 
> Picked up, with the order adjusted.
> 
> > Other than that this lgtm
> >  
> 
> I presume that lgtm == Reviewed-by...

yes :-) and formally here as well..

Reviewed-by: Vinod Koul <vkoul@...nel.org>

> 
> Thanks,
> Bjorn
> 
> > > +			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
> > 
> > -- 
> > ~Vinod

-- 
~Vinod