linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: SM8750: Enable CPUFreq support

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Message-ID: <f10ade51-b29f-45cc-9895-d66a319ab26c@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 16:55:26 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Jagadeesh Kona <jagadeesh.kona@....qualcomm.com>
Cc: Ajit Pandey <ajit.pandey@....qualcomm.com>,
        Imran Shaik <imran.shaik@....qualcomm.com>,
        Taniya Das <taniya.das@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Sibi Sankar <sibi.sankar@....qualcomm.com>,
        Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: SM8750: Enable CPUFreq support

On 1/20/2026 3:44 PM, Konrad Dybcio wrote:
> On 1/19/26 8:00 PM, Akhil P Oommen wrote:
>> On 12/11/2025 12:32 AM, Jagadeesh Kona wrote:
>>> Add the cpucp mailbox, sram and SCMI nodes required to enable
>>> the CPUFreq support using the SCMI perf protocol on SM8750 SoCs.
>>>
>>> Signed-off-by: Jagadeesh Kona <jagadeesh.kona@....qualcomm.com>
>>
>> Just curious, does this patch enable thermal mitigation for CPU clusters
>> too?
> 
> If nothing changed, we have lets-not-explode type mitigations via LMH,
> but lets-not-burn-the-user would require a skin temp sensor to be
> wired up, which then could be used to enable some cooling action

In some chipsets, I have noticed that the gpu cooling device throttles
GPU to the lowest OPP even with not-so-heavy GPU workloads, making it
unusable-ly slow. My hypothesis was that it was due to unmitigated CPU
temperature tripping up GPU Tsens.

So, I am wondering if there are any additional CPU cooling related
changes required to get a reasonable overall performance under thermal
constraints.

-Akhil.

> 
> Konrad