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 11:02:30 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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 03/11/2022 06:50, Manivannan Sadhasivam wrote:
> 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?

8280xp has 4xA78C and 4xX1C. You only added the latter ones to the 
cooling map.


>
>>> 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).

Ok, then I suppose it's fine. Thanks!


Konrad

>
> 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";
>>>