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

[Daniel Lezcano <daniel.lezcano@linaro.org>]

On 21/12/2020 16:00, Kai-Heng Feng wrote:
> On Mon, Dec 21, 2020 at 9:59 PM Daniel Lezcano
> <daniel.lezcano@linaro.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@canonical.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 ?


-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog