linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sm8650: setup gpu thermal with higher temperatures

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Message-ID: <56023e4f-d60b-41c3-a3c9-ba768613e9b2@oss.qualcomm.com>
Date: Thu, 16 Jan 2025 22:20:38 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        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
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sm8650: setup gpu thermal with
 higher temperatures

On 13.01.2025 11:28 AM, Akhil P Oommen wrote:
> On 1/10/2025 4:06 PM, Neil Armstrong wrote:
>> On the SM8650, the dynamic clock and voltage scaling (DCVS) for the GPU
>> is done in an hardware controlled loop by the GPU Management Unit (GMU).
>>
>> Since the GMU does a better job at maintaining the GPUs temperature in an
>> acceptable range by taking in account more parameters like the die
>> characteristics or other internal sensors, it makes no sense to try
>> and reproduce a similar set of constraints with the Linux devfreq thermal
>> core.
> 
> Just FYI, this description is incorrect. SM8650's GMU doesn't do any
> sort of thermal management.

What's this for then? Just reacting to thermal pressure?

https://git.codelinaro.org/clo/le/platform/vendor/qcom/opensource/graphics-kernel/-/commit/e4387d101d14965c8f2c67e10a6a9499c1a88af4

Konrad