linux-kernel - Re: [PATCH v2 1/2] thermal: int340x: Fix unexpected shutdown at critical temperature

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Date:   Mon, 11 Jan 2021 17:43:55 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "Zhang, Rui" <rui.zhang@...el.com>, amitk@...nel.org
Cc:     Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] thermal: int340x: Fix unexpected shutdown at
 critical temperature

On 11/01/2021 17:18, Kai-Heng Feng wrote:
> On Tue, Dec 22, 2020 at 1:23 AM Kai-Heng Feng
> <kai.heng.feng@...onical.com> 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>
> 
> A gentle ping...

Applied, they are in the testing branch now. They will be a linux-next
in a couple of days.

Thanks
  -- Daniel


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