linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845: Fix wild reboot during Antutu test

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Date: Tue, 16 Jan 2024 16:38:33 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Luca Weiss <luca.weiss@...rphone.com>, andersson@...nel.org,
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Amit Pundir <amit.pundir@...aro.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845: Fix wild reboot during Antutu
 test

On 16/01/2024 15:03, Luca Weiss wrote:
> On Tue Jan 16, 2024 at 1:51 PM CET, Daniel Lezcano wrote:
>> On 16/01/2024 13:37, Luca Weiss wrote:
>>> On Tue Jan 16, 2024 at 12:59 PM CET, Daniel Lezcano wrote:
>>>> Running an Antutu benchmark makes the board to do a hard reboot.
>>>>
>>>> Cause: it appears the gpu-bottom and gpu-top temperature sensors are showing
>>>> too high temperatures, above 115°C.
>>>>
>>>> Out of tree configuratons show the gpu thermal zone is configured to
>>>> be mitigated at 85°C with devfreq.
>>>>
>>>> Add the DT snippet to enable the thermal mitigation on the sdm845
>>>> based board.
>>>>
>>>> Fixes: c79800103eb18 ("arm64: dts: sdm845: Add gpu and gmu device nodes")
>>>> Cc: Amit Pundir <amit.pundir@...aro.org>
>>>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>>>
>>> A part of this is already included with this patch:
>>> https://lore.kernel.org/linux-arm-msm/20240102-topic-gpu_cooling-v1-4-fda30c57e353@linaro.org/
>>>
>>> Maybe rebase on top of that one and add the 85degC trip point or
>>> something?
>>
>> Actually, I think the patch is wrong.
> 
> I recommend telling Konrad in that patch then, not me :)

That's good Konrad is in the recipient list :)

>> The cooling effect does not operate on 'hot' trip point type as it is
>> considered as a critical trip point. The governor is not invoked, so no
>> mitigation happen. The 'hot' trip point type results in sending a
>> notification to userspace to give the last chance to do something before
>> 'critical' is reached where the system is shut down.
>>
>> I suggest to revert it and pick the one I proposed.
> 
> It hasn't been applied yet so it can be fixed in v2 there.

The patch was submitted without testing AFAICT. So it is preferable to 
pick the one I sent which was tested by Amit and me.



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