linux-kernel - [PATCH AUTOSEL 5.12 03/52] ACPI: PM: s2idle: Add missing LPS0 functions for AMD

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Message-Id: <20210705152913.1521036-3-sashal@kernel.org>
Date:   Mon,  5 Jul 2021 11:28:24 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alex Deucher <alexander.deucher@....com>,
        Hans de Goede <hdegoede@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-acpi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.12 03/52] ACPI: PM: s2idle: Add missing LPS0 functions for AMD

From: Alex Deucher <alexander.deucher@....com>

[ Upstream commit f59a905b962c34642e862b5edec35c0eda72d70d ]

These are supposedly not required for AMD platforms,
but at least some HP laptops seem to require it to
properly turn off the keyboard backlight.

Based on a patch from Marcin Bachry <hegel666@...il.com>.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1230
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/acpi/x86/s2idle.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index 2b69536cdccb..2d7ddb8a8cb6 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -42,6 +42,8 @@ static const struct acpi_device_id lps0_device_ids[] = {
 
 /* AMD */
 #define ACPI_LPS0_DSM_UUID_AMD      "e3f32452-febc-43ce-9039-932122d37721"
+#define ACPI_LPS0_ENTRY_AMD         2
+#define ACPI_LPS0_EXIT_AMD          3
 #define ACPI_LPS0_SCREEN_OFF_AMD    4
 #define ACPI_LPS0_SCREEN_ON_AMD     5
 
@@ -408,6 +410,7 @@ int acpi_s2idle_prepare_late(void)
 
 	if (acpi_s2idle_vendor_amd()) {
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD);
+		acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD);
 	} else {
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
@@ -422,6 +425,7 @@ void acpi_s2idle_restore_early(void)
 		return;
 
 	if (acpi_s2idle_vendor_amd()) {
+		acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT_AMD);
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD);
 	} else {
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
-- 
2.30.2