From: Richard Gong <richard.gong@amd.com>
Date: Wed, 22 Sep 2021 13:31:16 +0000 (-0500)
Subject: ACPI: processor idle: Allow playing dead in C3 state
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d6b88ce2eb9d;p=linux.git

ACPI: processor idle: Allow playing dead in C3 state

When some cores are disabled on AMD platforms, the system will no longer
be able to enter suspend-to-idle s0ix.

Update to allow playing dead in C3 state so that the CPUs can enter the
deepest state on AMD platforms.

BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1708
Suggested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Richard Gong <richard.gong@amd.com>
[ rjw: Fixed coding style ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f37fba9e5ba0b..76ef1bcc88480 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -789,7 +789,8 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
 		state->enter = acpi_idle_enter;
 
 		state->flags = 0;
-		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
+		if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2 ||
+		    cx->type == ACPI_STATE_C3) {
 			state->enter_dead = acpi_idle_play_dead;
 			drv->safe_state_index = count;
 		}