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Thu, 30 Apr 2026 07:24:34 -0700 From: Sumit Gupta To: , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 0/2] ACPI: CPPC: Add CPPC v4 support (ACPI 6.6) Date: Thu, 30 Apr 2026 19:54:28 +0530 Message-ID: <20260430142430.755437-1-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@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: MWH0EPF000C6189:EE_|MN2PR12MB4142:EE_ X-MS-Office365-Filtering-Correlation-Id: 2689cb4c-36f4-4ed8-88b2-08dea6c4447f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|376014|7416014|1800799024|921020|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700016)(376014)(7416014)(1800799024)(921020)(56012099003)(18002099003);DIR:OUT;SFP:1101; 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The platform classifies performance above this as boost and below as throttle for power/thermal decisions. - Resource Priority (8.4.6.1.2.7): Package of Resource Priority Register Descriptor sub-packages. Full parsing is not yet implemented; such entries are marked as unsupported. Patch 1: Add v4 _CPC parsing - validate the 25-entry layout, handle the Resource Priority package, and mark the two new registers optional. Patch 2: Add acpi_cppc/ospm_nominal_perf as a read-write sysfs attribute, and initialize it to the platform nominal value during cppc_cpufreq policy init. --- v1[1] -> v2: - Patch 1: added Reviewed-by from Mario Limonciello. - Patch 2: - Make ospm_nominal_perf sysfs read-write; cache last write in cpc_desc and skip redundant register writes. - Validate input in cppc_set_ospm_nominal_perf. Sumit Gupta (2): ACPI: CPPC: Add support for CPPC v4 ACPI: CPPC: Add ospm_nominal_perf support drivers/acpi/cppc_acpi.c | 93 +++++++++++++++++++++++++++++++--- drivers/cpufreq/cppc_cpufreq.c | 10 ++++ include/acpi/cppc_acpi.h | 14 ++++- 3 files changed, 109 insertions(+), 8 deletions(-) [1] https://lore.kernel.org/lkml/20260427051823.280419-1-sumitg@nvidia.com/ -- 2.34.1