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Wysocki" , Pavel Machek , Len Brown CC: , Subject: [PATCH v3 01/10] PM: suspend: Introduce `pm_suspend_preferred_s2idle` Date: Thu, 30 Jun 2022 21:33:19 -0500 Message-ID: <20220701023328.2783-1-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8ceea068-d2dc-45d9-4114-08da5b0a1536 X-MS-TrafficTypeDiagnostic: BY5PR12MB4052:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230016)(4636009)(136003)(396003)(376002)(346002)(39860400002)(36840700001)(46966006)(40470700004)(41300700001)(6666004)(5660300002)(478600001)(82310400005)(2906002)(316002)(356005)(82740400003)(26005)(186003)(16526019)(40460700003)(81166007)(36756003)(1076003)(4326008)(8936002)(70586007)(86362001)(7696005)(15650500001)(426003)(47076005)(44832011)(110136005)(83380400001)(2616005)(336012)(54906003)(8676002)(40480700001)(36860700001)(70206006)(81973001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2022 02:33:28.9399 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8ceea068-d2dc-45d9-4114-08da5b0a1536 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT020.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4052 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Many drivers in the kernel will check the FADT to determine if low power idle is supported and use this information to set up a policy decision in the driver. To abstract this information from drivers introduce a new helper symbol that can indicate this information. Signed-off-by: Mario Limonciello --- include/linux/suspend.h | 1 + kernel/power/suspend.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 70f2921e2e70..9d911e026720 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -305,6 +305,7 @@ static inline bool idle_should_enter_s2idle(void) return unlikely(s2idle_state == S2IDLE_STATE_ENTER); } +extern bool pm_suspend_preferred_s2idle(void); extern bool pm_suspend_default_s2idle(void); extern void __init pm_states_init(void); extern void s2idle_set_ops(const struct platform_s2idle_ops *ops); diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 827075944d28..0030e7dfe6cf 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -9,6 +9,7 @@ #define pr_fmt(fmt) "PM: " fmt +#include #include #include #include @@ -61,6 +62,22 @@ static DECLARE_SWAIT_QUEUE_HEAD(s2idle_wait_head); enum s2idle_states __read_mostly s2idle_state; static DEFINE_RAW_SPINLOCK(s2idle_lock); +/** + * pm_suspend_preferred_s2idle - Check if suspend-to-idle is the preferred suspend method. + * + * Return 'true' if suspend-to-idle is preferred by the system designer for the default + * suspend method. + */ +bool pm_suspend_preferred_s2idle(void) +{ +#ifdef CONFIG_ACPI + return acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0; +#else + return false; +#endif +} +EXPORT_SYMBOL_GPL(pm_suspend_preferred_s2idle); + /** * pm_suspend_default_s2idle - Check if suspend-to-idle is the default suspend. * -- 2.34.1