linux-kernel - Re: [PATCH] arm64: dts: qcom: sm6350: Add tsens thermal zones

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Date: Fri, 26 Jan 2024 08:49:24 +0100
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Konrad Dybcio" <konrad.dybcio@...aro.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>
Cc: <~postmarketos/upstreaming@...ts.sr.ht>, <phone-devel@...r.kernel.org>,
 <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sm6350: Add tsens thermal zones

On Thu Jan 25, 2024 at 5:30 PM CET, Konrad Dybcio wrote:
>
>
> On 1/24/24 16:31, Luca Weiss wrote:
> > Add the definitions for the various thermal zones found on the SM6350
> > SoC. Hooking up GPU and CPU cooling can limit the clock speeds there to
> > reduce the temperature again to good levels.
> > 
> > Most thermal zones only have one critical temperature configured at
> > 125°C which can be mostly considered a placeholder until those zones can
> > be hooked up to cooling.
> > 
> > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> > ---
>
> [...]
>
> > +		cpuss0-thermal {
> > +			polling-delay-passive = <0>;
> > +			polling-delay = <0>;
> > +
> > +			thermal-sensors = <&tsens0 7>;
>
> cpuss0-thermal and cpuss1-thermal are very likely the sensors for
> cluster0/1, can you test that out, perhaps with corepinning+stress?

Not really, according to my docs the CPUs aren't placed symmetrically on
the SoC and cpuss0 and cpuss1 are just somewhere inbetween all of the 6x
LITTLE cores, the 2x big cores are a little bit further away. So apart
from hooking up all of the cores for cooling for cpuss0 & cpuss1 I don't
have a great idea what to do here. Shall I do that?

Regards
Luca


> You can then assign multiple cpu cooling devices.
>
> LGTM otherwise!
>
>
> Konrad