linux-kernel - [PATCHv1] ACPI: processor idle: Allow playing dead in C3 state

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Message-ID: <20210922133116.102-1-richard.gong@amd.com>
Date:   Wed, 22 Sep 2021 08:31:16 -0500
From:   Richard Gong <richard.gong@....com>
To:     <rafael@...nel.org>, <lenb@...nel.org>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lijo.lazar@....com>, Richard Gong <richard.gong@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCHv1] 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@....com>
Signed-off-by: Richard Gong <richard.gong@....com>
---
 drivers/acpi/processor_idle.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f37fba9e5ba0..61d5a72d218e 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;
 		}
-- 
2.25.1