linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp: Introduce additional tsens instances

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Date: Fri, 19 Jan 2024 11:00:27 -0800
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
CC: Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: Introduce additional tsens
 instances

On Fri, Jan 19, 2024 at 12:31:06AM +0100, Konrad Dybcio wrote:
> 
> 
> On 1/19/24 00:00, Bjorn Andersson wrote:
> > The SC8280XP contains two additional tsens instances, providing among
> > other things thermal measurements for the GPU.
> > 
> > Add these and a GPU thermal-zone.
> > 
> > Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> > ---
> >   arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 37 ++++++++++++++++++++++++++++++++++
> >   1 file changed, 37 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > index febf28356ff8..68b5ac0339a0 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > @@ -4033,6 +4033,28 @@ tsens1: thermal-sensor@...5000 {
> >   			#thermal-sensor-cells = <1>;
> >   		};
> > +		tsens2: thermal-sensor@...1000 {
> > +			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
> > +			reg = <0 0x0c251000 0 0x1ff>, /* TM */
> > +			      <0 0x0c224000 0 0x8>; /* SROT */
> 
> I've previously called for removing these comments that we've been
> copypasting around for years and years, and I'm gonna stand by that :P
> 

I'm not against that idea, but are you requesting that I update the
patch, removing the comments as well. Or that I send another patch
removing all of them?

> [...]
> 
> > +		gpu-thermal {
> > +			polling-delay-passive = <250>;
> > +			polling-delay = <1000>;
> 
> Hm, did tsens only gain support of non-polled reporting with 8450?
> 
> If not, we should definitely update all the relevant SoCs.
> 

Are you referring to the fact that 8450 seems to set most*
polling-delays to 0, which are "valid" delays but would cause
thermal_zone_device_set_polling() to just cancel the timeout every time?

We should be able to do that on all platforms with working interrupts,
no?

[*] Some of the zones has a passive timeout of 10?


That said, as above. Would you like me to fix that now?

Regards,
Bjorn