ACPI: PM: s2idle: Add missing LPS0 functions for AMD

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 <[e-mail]>.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1230
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/x86/s2idle.c

···
 
 /* 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
 
···
 
 	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);
···
 		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);