linux-kernel - Re: [PATCH v5 6/6] arm64: dts: qcom: Enable cpu cooling devices for QCS9075 platforms

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Message-ID: <dc6876f2-ede8-4105-86fd-fd7060d9e7fd@oss.qualcomm.com>
Date: Mon, 30 Dec 2024 16:35:12 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: 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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...cinc.com,
        Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
Subject: Re: [PATCH v5 6/6] arm64: dts: qcom: Enable cpu cooling devices for
 QCS9075 platforms

On 29.12.2024 4:23 PM, 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.
> 
> Signed-off-by: Manaf Meethalavalappu Pallikunhi <quic_manafm@...cinc.com>
> ---

Does this bring measurable benefits over just making the CPU a cooling
device and pointing the thermal zones to it (and not the idle subnode)?

Konrad