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Message-ID: <ubasbsyspn5euygihgphyw3xg4ckveytvgnjpwdiyg4pv7degr@6y44ya4gvaqj>
Date: Fri, 3 Jan 2025 07:51:24 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
Cc: Wasim Nazir <quic_wasimn@...cinc.com>,
Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH v5 6/6] arm64: dts: qcom: Enable cpu cooling devices for
QCS9075 platforms
On Tue, Dec 31, 2024 at 05:31:41PM +0530, Manaf Meethalavalappu Pallikunhi wrote:
>
> Hi Dmitry,
>
> On 12/30/2024 9:10 PM, Dmitry Baryshkov wrote:
> > On Sun, Dec 29, 2024 at 08:53:32PM +0530, Wasim Nazir wrote:
> > > From: Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
> > >
> > > In QCS9100 SoC, the safety subsystem monitors all thermal sensors and
> > > does corrective action for each subsystem based on sensor violation
> > > to comply safety standards. But as QCS9075 is non-safe SoC it
> > > requires conventional thermal mitigation to control thermal for
> > > different subsystems.
> > >
> > > The cpu frequency throttling for different cpu tsens is enabled in
> > > hardware as first defense for cpu thermal control. But QCS9075 SoC
> > > has higher ambient specification. During high ambient condition, even
> > > lowest frequency with multi cores can slowly build heat over the time
> > > and it can lead to thermal run-away situations. This patch restrict
> > > cpu cores during this scenario helps further thermal control and
> > > avoids thermal critical violation.
> > >
> > > Add cpu idle injection cooling bindings for cpu tsens thermal zones
> > > as a mitigation for cpu subsystem prior to thermal shutdown.
> > >
> > > Add cpu frequency cooling devices that will be used by userspace
> > > thermal governor to mitigate skin thermal management.
> > Does anything prevent us from having this config as a part of the basic
> > sa8775p.dtsi setup? If HW is present in the base version but it is not
> > accessible for whatever reason, please move it the base device config
> > and use status "disabled" or "reserved" to the respective board files.
>
> Sure, I will move idle injection node for each cpu to sa8775p.dtsi and keep
> it disabled state. #cooling cells property for CPU, still wanted to keep it
> in board files as we don't want to enable any cooling device in base DT.
"we don't want" is not a proper justification. So, no.
>
> Best Regards,
>
> Manaf
>
> >
> > > Signed-off-by: Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
> > > ---
> > > arch/arm64/boot/dts/qcom/qcs9075-rb8.dts | 1 +
> > > arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts | 1 +
> > > arch/arm64/boot/dts/qcom/qcs9075-ride.dts | 1 +
> > > arch/arm64/boot/dts/qcom/qcs9075-thermal.dtsi | 287 ++++++++++++++++++
> > > 4 files changed, 290 insertions(+)
> > > create mode 100644 arch/arm64/boot/dts/qcom/qcs9075-thermal.dtsi
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs9075-rb8.dts b/arch/arm64/boot/dts/qcom/qcs9075-rb8.dts
> > > index ecaa383b6508..3ab6deeaacf1 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcs9075-rb8.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcs9075-rb8.dts
> > > @@ -9,6 +9,7 @@
> > >
> > > #include "sa8775p.dtsi"
> > > #include "sa8775p-pmics.dtsi"
> > > +#include "qcs9075-thermal.dtsi"
> > >
> > > / {
> > > model = "Qualcomm Technologies, Inc. Robotics RB8";
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts b/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
> > > index d9a8956d3a76..5f2d9f416617 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
> > > @@ -5,6 +5,7 @@
> > > /dts-v1/;
> > >
> > > #include "sa8775p-ride.dtsi"
> > > +#include "qcs9075-thermal.dtsi"
> > >
> > > / {
> > > model = "Qualcomm Technologies, Inc. QCS9075 Ride Rev3";
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs9075-ride.dts b/arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> > > index 3b524359a72d..10ce48e7ba2f 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> > > @@ -5,6 +5,7 @@
> > > /dts-v1/;
> > >
> > > #include "sa8775p-ride.dtsi"
> > > +#include "qcs9075-thermal.dtsi"
> > >
> > > / {
> > > model = "Qualcomm Technologies, Inc. QCS9075 Ride";
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs9075-thermal.dtsi b/arch/arm64/boot/dts/qcom/qcs9075-thermal.dtsi
> > > new file mode 100644
> > > index 000000000000..40544c8582c4
> > > --- /dev/null
> > > +++ b/arch/arm64/boot/dts/qcom/qcs9075-thermal.dtsi
> > > @@ -0,0 +1,287 @@
> > > +// SPDX-License-Identifier: BSD-3-Clause
> > > +/*
> > > + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> > > + */
> > > +
> > > +#include <dt-bindings/thermal/thermal.h>
> > > +
> > > +&cpu0 {
> > > + #cooling-cells = <2>;
> > > +};
> > > +
> > > +&cpu1 {
> > > + #cooling-cells = <2>;
> > > + cpu1_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu2 {
> > > + #cooling-cells = <2>;
> > > + cpu2_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu3 {
> > > + #cooling-cells = <2>;
> > > + cpu3_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu4 {
> > > + #cooling-cells = <2>;
> > > + cpu4_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu5 {
> > > + #cooling-cells = <2>;
> > > + cpu5_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu6 {
> > > + #cooling-cells = <2>;
> > > + cpu6_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +&cpu7 {
> > > + #cooling-cells = <2>;
> > > + cpu7_idle: thermal-idle {
> > > + #cooling-cells = <2>;
> > > + duration-us = <800000>;
> > > + exit-latency-us = <10000>;
> > > + };
> > > +};
> > > +
> > > +/ {
> > > + thermal-zones {
> > > + cpu-0-1-0-thermal {
> > > + trips {
> > > + cpu_0_1_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_1_0_passive>;
> > > + cooling-device = <&cpu1_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-0-2-0-thermal {
> > > + trips {
> > > + cpu_0_2_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_2_0_passive>;
> > > + cooling-device = <&cpu2_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-0-3-0-thermal {
> > > + trips {
> > > + cpu_0_3_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_3_0_passive>;
> > > + cooling-device = <&cpu3_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-0-1-1-thermal {
> > > + trips {
> > > + cpu_0_1_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_1_1_passive>;
> > > + cooling-device = <&cpu1_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-0-2-1-thermal {
> > > + trips {
> > > + cpu_0_2_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_2_1_passive>;
> > > + cooling-device = <&cpu2_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-0-3-1-thermal {
> > > + trips {
> > > + cpu_0_3_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_0_3_1_passive>;
> > > + cooling-device = <&cpu3_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-0-0-thermal {
> > > + trips {
> > > + cpu_1_0_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_0_0_passive>;
> > > + cooling-device = <&cpu4_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-1-0-thermal {
> > > + trips {
> > > + cpu_1_1_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_1_0_passive>;
> > > + cooling-device = <&cpu5_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-2-0-thermal {
> > > + trips {
> > > + cpu_1_2_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_2_0_passive>;
> > > + cooling-device = <&cpu6_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-3-0-thermal {
> > > + trips {
> > > + cpu_1_3_0_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_3_0_passive>;
> > > + cooling-device = <&cpu7_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-0-1-thermal {
> > > + trips {
> > > + cpu_1_0_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_0_1_passive>;
> > > + cooling-device = <&cpu4_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-1-1-thermal {
> > > + trips {
> > > + cpu_1_1_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_1_1_passive>;
> > > + cooling-device = <&cpu5_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-2-1-thermal {
> > > + trips {
> > > + cpu_1_2_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_2_1_passive>;
> > > + cooling-device = <&cpu6_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + cpu-1-3-1-thermal {
> > > + trips {
> > > + cpu_1_3_1_passive: trip-point1 {
> > > + temperature = <116000>;
> > > + };
> > > + };
> > > +
> > > + cooling-maps {
> > > + map0 {
> > > + trip = <&cpu_1_3_1_passive>;
> > > + cooling-device = <&cpu7_idle 100 100>;
> > > + };
> > > + };
> > > + };
> > > + };
> > > +};
> > > --
> > > 2.47.0
> > >
--
With best wishes
Dmitry
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