linux-kernel - Re: [PATCH v2 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal zone support

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Date:   Thu, 3 Nov 2022 11:20:14 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        quic_jprakash@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        steev@...i.org
Subject: Re: [PATCH v2 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal
 zone support

On Sat, Oct 29, 2022 at 04:29:05PM +0200, Konrad Dybcio wrote:
> 
> 
> On 29.10.2022 07:14, Manivannan Sadhasivam wrote:
> > Add thermal zone support by making use of the thermistor SYS_THERM6.
> > Based on experiments, this thermistor seems to reflect the actual
> > surface temperature of the laptop.
> > 
> > For the cooling device, all BIG CPU cores are throttle down to keep the
> s/throttle/throttled
> 
> Is it okay to let the 4xA78C run at full throttle in thermal emergencies though?

I don't get it. Can you elaborate?

> > temperature at a sane level.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  .../qcom/sc8280xp-lenovo-thinkpad-x13s.dts    | 46 +++++++++++++++++++
> >  1 file changed, 46 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > index ca77c19c6d0d..96e2fa72f782 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> > @@ -29,6 +29,52 @@ backlight {
> >  		pinctrl-0 = <&edp_bl_en>, <&edp_bl_pwm>;
> >  	};
> >  
> > +	thermal-zones {
> > +		skin-temp-thermal {
> > +			polling-delay-passive = <250>;
> > +			polling-delay = <0>;
> > +			thermal-sensors = <&pmk8280_adc_tm 5>;
> > +
> > +			trips {
> > +				skin_temp_alert0: trip-point0 {
> > +					temperature = <55000>;
> > +					hysteresis = <1000>;
> > +					type = "passive";
> > +				};
> > +
> > +				skin_temp_alert1: trip-point1 {
> > +					temperature = <58000>;
> > +					hysteresis = <1000>;
> > +					type = "passive";
> > +				};
> > +
> > +				skin-temp-crit {
> > +					temperature = <73000>;
> Ouch, I didn't know we were serving burnt fingers at the cafeteria today :D
> 
> Or maybe this just looks scary.. The laptop looks plastic, so maybe it won't cause instant
> burns?
> 

73c is what the reasonable number I came up with after some experiments. At
this point the temperature won't burn your finger but crossing this surely
would (that's what happening without this series).

Thanks,
Mani

> Konrad
> > +					hysteresis = <1000>;
> > +					type = "critical";
> > +				};
> > +			};
> > +
> > +			cooling-maps {
> > +				map0 {
> > +					trip = <&skin_temp_alert0>;
> > +					cooling-device = <&CPU4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> > +				};
> > +
> > +				map1 {
> > +					trip = <&skin_temp_alert1>;
> > +					cooling-device = <&CPU4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > +							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> > +				};
> > +			};
> > +		};
> > +	};
> > +
> >  	vreg_edp_bl: regulator-edp-bl {
> >  		compatible = "regulator-fixed";
> >  

-- 
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