linux-kernel - [PATCH 5.15 007/189] ACPI: processor idle: Allow playing dead in C3 state

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Date:   Mon, 18 Apr 2022 14:10:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mario Limonciello <mario.limonciello@....com>,
        Richard Gong <richard.gong@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.15 007/189] ACPI: processor idle: Allow playing dead in C3 state

From: Richard Gong <richard.gong@....com>

commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1 upstream.

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@....com>
Signed-off-by: Richard Gong <richard.gong@....com>
[ rjw: Fixed coding style ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/acpi/processor_idle.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -789,7 +789,8 @@ static int acpi_processor_setup_cstates(
 		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;
 		}