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Wysocki" , CC: , Mario Limonciello Subject: [PATCH 0/2] Avoid enabling LPI on non-ARM Date: Thu, 24 Feb 2022 21:12:53 -0600 Message-ID: <20220225031255.3647599-1-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 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: c66e71a8-e00d-4532-5b4e-08d9f80d2eb3 X-MS-TrafficTypeDiagnostic: MN0PR12MB5738:EE_ X-Microsoft-Antispam-PRVS: 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:(13230001)(4636009)(46966006)(36840700001)(40470700004)(110136005)(86362001)(5660300002)(8936002)(316002)(70206006)(4326008)(8676002)(54906003)(36756003)(508600001)(70586007)(2906002)(40460700003)(44832011)(6666004)(26005)(186003)(426003)(81166007)(82310400004)(356005)(1076003)(47076005)(36860700001)(2616005)(16526019)(336012)(83380400001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Feb 2022 03:16:15.0467 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c66e71a8-e00d-4532-5b4e-08d9f80d2eb3 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: DM6NAM11FT051.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB5738 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On some AMD platforms the platform _OSC negotiation will lead to `osc_pc_lpi_support_confirmed` being set and because the ACPI tables are populated with `_LPI` entries the kernel will attempt to enable LPI. On non-ARM kernels LPI is not supported and both `acpi_processor_ffh_lpi_probe` and `acpi_processor_ffh_lpi_enter` will return error codes. When this happens there is no recourse though; the cpuidle code does not switch to `_CST` mode, but rather it will continue to behave as though LPI has been enabled and the CPU will remain in a high power state. This patch series shifts the checks around while enabling LPI to detect this situation and let the system continue to set up in _CST mode. Mario Limonciello (2): PSCI: cpuidle: Move the `has_lpi` check to the beginning of the function ACPI: processor idle: Check for architectural support for LPI arch/arm64/kernel/cpuidle.c | 6 +++--- drivers/acpi/processor_idle.c | 15 ++++++++++----- 2 files changed, 13 insertions(+), 8 deletions(-)