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Subject[PATCH AUTOSEL 5.12 03/52] ACPI: PM: s2idle: Add missing LPS0 functions for AMD
Date
From: Alex Deucher <alexander.deucher@amd.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@gmail.com>.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1230
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.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
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