linux-kernel - [PATCH v2 0/1] Add quiet/low power compat code

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Message-ID: <20250304064745.1073770-1-superm1@kernel.org>
Date: Tue,  4 Mar 2025 00:47:44 -0600
From: Mario Limonciello <superm1@...nel.org>
To: Shyam Sundar S K <Shyam-sundar.S-k@....com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	"Luke D . Jones" <luke@...nes.dev>,
	Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: platform-driver-x86@...r.kernel.org (open list:AMD PMF DRIVER),
	linux-kernel@...r.kernel.org (open list),
	linux-acpi@...r.kernel.org (open list:ACPI),
	"Derek J . Clark" <derekjohn.clark@...il.com>,
	Antheas Kapenekakis <lkml@...heas.dev>,
	me@...egospodneti.ch,
	Denis Benato <benato.denis96@...il.com>,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v2 0/1] Add quiet/low power compat code

From: Mario Limonciello <mario.limonciello@....com>

When two drivers provide platform profile handlers but use different
strings to mean (essentially) the same thing the legacy interface won't
export them because it only shows profiles common to multiple drivers.

This causes an unexpected behavior to people who have upgraded from an
earlier kernel because if multiple drivers have bound platform profile
handlers they might not be able to access profiles they were expecting.

Introduce a compatibility mode to the core that when one driver supports
quiet and the other supports low power that allows both to enter the
appropriate mode.

There have been some other attempts at solving this issue in other ways.
This serves as an alternative to those attempts.

v1 -> v2:
 * Drop hidden choices.
 * Just add compatibility to the core for low power and quiet modes 

Link: https://lore.kernel.org/platform-driver-x86/e64b771e-3255-42ad-9257-5b8fc6c24ac9@gmx.de/T/#t
Link: https://lore.kernel.org/platform-driver-x86/CAGwozwF-WVEgiAbWbRCiUaXf=BVa3KqmMJfs06trdMQHpTGmjQ@mail.gmail.com/T/#m2f3929e2d4f73cc0eedd14738170dad45232fd18
Link: https://lore.kernel.org/platform-driver-x86/20250228170155.2623386-1-superm1@kernel.org/
Cc: Antheas Kapenekakis <lkml@...heas.dev>
Cc: "Luke D. Jones" <luke@...nes.dev>

Mario Limonciello (1):
  ACPI: platform_profile: Treat quiet and low power the same

 drivers/acpi/platform_profile.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

-- 
2.43.0