linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8996: Add CPU cooling suppor,t

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Date:   Mon, 27 Sep 2021 18:45:29 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     y.oudjana@...tonmail.com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        gpiccoli@...lia.com, kernel@...ccoli.net, loic.poulain@...aro.org,
        konrad.dybcio@...ainline.org
Subject: Re: [PATCH] arm64: dts: qcom: msm8996: Add CPU cooling suppor,t

Hi Yassine, thanks for the patch! I was doing some experiments with a
dragonboard 820-based board, and without your patch, a CPU benchmark can
quickly cause overheating - throttling mechanism doesn't start and we
get a FW reset to a bad state (likely a HW protection mechanism).

I noticed that a similar patch including cooling maps is present in
Linaro's qcom tree [0], and it was submitted upstream [1], but there was
a re-submission [2] by Konrad that was merged and dropped the thermals
part. Based on some threads I read, it seems a FW lockup was detected
with the complete patch?

I'm not sure, so I'm looping Konrad / Loic / Bjorn here, to understand
better what made this portion of the patch to be dropped.
Anyway, I think worth to mention this in your commit message Yassine,
including perhaps a fixes tag like:

Fixes: 90173a954a22 ("arm64: dts: qcom: msm8996: Add CPU opps").

Also, I'm not sure why there was no response here or why it wasn't
merged, but if it helps, please have my:

Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com>

Thanks,

Guilherme

[0]
https://git.linaro.org/landing-teams/working/qualcomm/kernel.git/commit/?h=release/qcomlt-4.14&id=2274c48c671

[1]
https://patchwork.kernel.org/project/linux-arm-msm/patch/1595253740-29466-6-git-send-email-loic.poulain@linaro.org/

[2]
https://lore.kernel.org/linux-arm-msm/20210527194455.782108-2-konrad.dybcio@somainline.org/