linux-kernel - Re: [PATCH v3] platform/x86:intel/pmc: Enable the ACPI PM Timer to be turned off when suspended

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Message-ID: <87plqt44l9.ffs@tglx>
Date: Wed, 31 Jul 2024 23:46:42 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Marek Maślanka <mmaslanka@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Rajneesh Bhardwaj
 <irenic.rajneesh@...il.com>, David E Box <david.e.box@...el.com>, Hans de
 Goede <hdegoede@...hat.com>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>, John Stultz <jstultz@...gle.com>, Stephen
 Boyd <sboyd@...nel.org>, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v3] platform/x86:intel/pmc: Enable the ACPI PM Timer to
 be turned off when suspended

On Wed, Jul 31 2024 at 23:41, Marek Maślanka wrote:
> On Wed, Jul 31, 2024 at 6:33 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>> On Wed, Jul 31 2024 at 16:44, Marek Maślanka wrote:
>> > Thanks. I'll try do this in that way. But I need to disable/enable
>> > ACPI PM timer only on suspend/resume, so I'll use suspend/resume
>> > callbacks.
>>
>> Why? What's the point of keeping it running when nothing uses it?
>>
> In case of Intel CPUs the watchdog (iTCO/wdat_wdt) is driven by ACPI PM
> Timer. But it may also be used by others that I don't know about, so I don't
> want to disable it.

Fair enough.