linux-kernel - [PATCH 5.16 0605/1039] ACPI / x86: Drop PWM2 device on Lenovo Yoga Book from always present table

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Message-Id: <20220124184145.668191846@linuxfoundation.org>
Date:   Mon, 24 Jan 2022 19:39:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0605/1039] ACPI / x86: Drop PWM2 device on Lenovo Yoga Book from always present table

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit d431dfb764b145369be820fcdfd50f2159b9bbc2 ]

It turns out that there is a WMI object which controls the PWM2 device
used for the keyboard backlight and that WMI object also provides some
other useful functionality.

The upcoming lenovo-yogabook-wmi driver will offer both backlight
control and the other functionality, so there no longer is a need
to have the lpss-pwm driver binding to PWM2 for backlight control;
and this is now actually undesirable because this will cause both
the WMI code and the lpss-pwm driver to poke at the same PWM
controller.

Drop the always-present quirk for the PWM2 ACPI-device, so that the
 lpss-pwm controller will no longer bind to it.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/acpi/x86/utils.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index f22f23933063b..3bcac98f6eca6 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -54,10 +54,6 @@ static const struct always_present_id always_present_ids[] = {
 	ENTRY("80860F09", "1", X86_MATCH(ATOM_SILVERMONT), {}),
 	ENTRY("80862288", "1", X86_MATCH(ATOM_AIRMONT), {}),
 
-	/* Lenovo Yoga Book uses PWM2 for keyboard backlight control */
-	ENTRY("80862289", "2", X86_MATCH(ATOM_AIRMONT), {
-			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"),
-		}),
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
-- 
2.34.1