linux-kernel - Re: power-off delay/hang due to commit 6d25be57 (mainline)

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Date:   Wed, 7 Oct 2020 18:18:03 +0200
From:   "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Stephen Berman <stephen.berman@....net>,
        Zhang Rui <rui.zhang@...el.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>
Subject: Re: power-off delay/hang due to commit 6d25be57 (mainline)

On 10/6/2020 11:49 PM, Sebastian Andrzej Siewior wrote:
> On 2020-08-11 20:49:05 [+0200], To Stephen Berman wrote:
>> On 2020-08-11 19:22:19 [+0200], Stephen Berman wrote:
>>> Attached.
>> ssdt6.dsl:
>> |  ThermalZone (TZ10)
>> |  {
>> …
>> |      Method (_TSP, 0, Serialized)  // _TSP: Thermal Sampling Period
>> |      {
>> |          Return (0x0A)
>> |      }
>> |
>> |      Method (_TZP, 0, Serialized)  // _TZP: Thermal Zone Polling
>> |      {
>> |          Return (0x0A)
>> |      }
>> |
>> |      Method (_TMP, 0, Serialized)  // _TMP: Temperature
>> |      {
>> |          \GSA1.ZRC3 ()
>> |          Sleep (0x03E8)
>> |          Notify (\_TZ.TZ10, 0x81) // Thermal Trip Point Change
>> |          Return (0x0B54)
>> |      }
>>
>> So if I read this correctly then TZ10 should be polled every second
>> (check) and the temperature function contains a `sleep(1 second)' (which
>> explains the mysteries delay) followed by the Notify() (which schedules
>> the worker).
>>
>>> Done as Bug 208877.
> Rafael, do you have any suggestions?
>   

I've lost track of this sorry.

I have ideas, let me get back to this next week.

Cheers!