linux-kernel - Re: [PATCH 1/2] thermal: int340x: Add critical callback to override default shutdown behavior

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Message-ID: <9e4dc22e-e912-8410-945c-f802f3959028@linaro.org>
Date:   Mon, 21 Dec 2020 17:03:38 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     "Zhang, Rui" <rui.zhang@...el.com>, amitk@...nel.org,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Peter Kaestle <peter@...e.net>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] thermal: int340x: Add critical callback to override
 default shutdown behavior

On 21/12/2020 16:00, Kai-Heng Feng wrote:
> On Mon, Dec 21, 2020 at 9:59 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
>>
>> On 21/12/2020 14:52, Kai-Heng Feng wrote:
>>> We are seeing thermal shutdown on Intel based mobile workstations, the
>>> shutdown happens during the first trip handle in
>>> thermal_zone_device_register():
>>> kernel: thermal thermal_zone15: critical temperature reached (101 C), shutting down
>>>
>>> However, we shouldn't do a thermal shutdown here, since
>>> 1) We may want to use a dedicated daemon, Intel's thermald in this case,
>>> to handle thermal shutdown.
>>>
>>> 2) For ACPI based system, _CRT doesn't mean shutdown unless it's inside
>>> ThermalZone namespace. ACPI Spec, 11.4.4 _CRT (Critical Temperature):
>>> "... If this object it present under a device, the device’s driver
>>> evaluates this object to determine the device’s critical cooling
>>> temperature trip point. This value may then be used by the device’s
>>> driver to program an internal device temperature sensor trip point."
>>>
>>> So a "critical trip" here merely means we should take a more aggressive
>>> cooling method.
>>>
>>> As int340x device isn't present under ACPI ThermalZone, override the
>>> default .critical callback to prevent surprising thermal shutdown.
>>>
>>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
>>
>> I'll submit those changes for v5.11-rc1 and change the subject by:
>>
>> thermal: int340x: Fix unexpected shutdown at critical temperature
>> thermal: pch: Fix unexpected shutdown at critical temperature
>>
>> Sounds good ?
> 
> Sounds good to me. Thanks!
> 
> Kai-Heng

Rui, Srinivas? Are you ok with the changes ?


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