linux-kernel - Re: [PATCH v1 03/10] ARM: tegra: acer-a500: Bump thermal trips by 10C

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Message-ID: <d961df59-49fe-94b2-fc1c-7ed3ead6abd7@gmail.com>
Date:   Sat, 15 May 2021 01:17:42 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Agneli <poczt@...tonmail.ch>, Paul Fertser <fercerpav@...il.com>,
        Svyatoslav Ryhel <clamor95@...il.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/10] ARM: tegra: acer-a500: Bump thermal trips by 10C

15.05.2021 00:16, Michał Mirosław пишет:
> On Mon, May 10, 2021 at 11:25:53PM +0300, Dmitry Osipenko wrote:
>> It's possible to hit the temperature of the thermal zone in a very warm
>> environment under a constant load, like watching a video using software
>> decoding. It's even easier to hit the limit with a slightly overclocked
>> CPU. Bump the temperature limit by 10C in order to improve user
>> experience. Acer A500 has a large board and 10" display panel which are
>> used for the heat dissipation, the SoC is placed far away from battery,
>> hence we can safely bump the temperature limit.
> 
> 60^C looks like a touch-safety limit (to avoid burns for users). Did you
> verify the touchable parts' temperature somehow after the change?

The SoC is placed under a can. Both front and back of device are large
metal planes which dissipate heat efficiently. I don't recall A500
getting hot ever and I'm holding it in hands every day. From a user
perspective it may feel like a part of device getting slightly warm in a
worst case.