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Wed, 27 May 2026 13:26:11 -0700 From: Sumit Gupta To: , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v4 1/2] cpufreq: CPPC: Set CPPC Enable register in cpu_init Date: Thu, 28 May 2026 01:55:49 +0530 Message-ID: <20260527202550.206828-2-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260527202550.206828-1-sumitg@nvidia.com> References: <20260527202550.206828-1-sumitg@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000012:EE_|IA4PR12MB9835:EE_ X-MS-Office365-Filtering-Correlation-Id: aa05c82d-0e14-4a97-b90f-08debc2e3e9b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|82310400026|7416014|376014|921020|18002099003|22082099003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: U0WLmzJ9FBSNUsLGt+GuhHFvohVrrd6S5zq7lQyCpYjNY72Ox075033awyJa5Duy0ZYnceIrLNZM2pvvLMjVl9v8eVV0hOBTTFbWb+3DgNXPfHn3JHPMsSW71nzhdNFmoWD1XwoA54dtQwyYH7CY6aB6Eou9GMpp9lmJZdBQgvgIiFOqeAvw5BSXP2sHRaoZS7Q0LEieTbm6Y6R3PouX2ljNdSkkyu6OnxhXfBBiqaK7oAWaZNBhD2NbnkvEcHWCs6X0z5dybdG+DUUGJ5ucr294XydFdU8BgcqzmEw7w4g3nww331yAqlTzEQI0HwsseLXwnCOZXjiS2s2qVhQ2x9TeUKNQegkHQo9e6Hwqfn5c6jOLMPwNUqrIj8iVOnHa6EhHQaTHlaXalLmSJeivVlBR1Y5cDQ6XR+vPiCiL+m5Kj3pzkYw01mrcNtNs+b4r X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2026 20:26:33.6672 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aa05c82d-0e14-4a97-b90f-08debc2e3e9b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000012.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR12MB9835 As per ACPI 6.x s8.4.6.1.4 (CPPC Enable register): "If supported by the platform, OSPM writes a one to this register to enable CPPC on this processor. If not implemented, OSPM assumes the platform always has CPPC enabled." Call cppc_set_enable() at the start of cppc_cpufreq_cpu_init() so this is done for both OS-driven and autonomous CPPC control modes. Errors are logged but non-fatal as the register is optional. Signed-off-by: Sumit Gupta --- drivers/cpufreq/cppc_cpufreq.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index 64387b6587cc..7db33761e899 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -655,6 +655,14 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy) caps = &cpu_data->perf_caps; policy->driver_data = cpu_data; + /* + * Enable CPPC for both OS-driven and autonomous modes. + * The Enable register is optional - some platforms may not support it + */ + ret = cppc_set_enable(cpu, true); + if (ret && ret != -EOPNOTSUPP) + pr_warn("Failed to enable CPPC for CPU%d (%d)\n", cpu, ret); + /* * Set min to lowest nonlinear perf to avoid any efficiency penalty (see * Section 8.4.7.1.1.5 of ACPI 6.1 spec) -- 2.34.1