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Wysocki" CC: , , , K Prateek Nayak , , Mario Limonciello Subject: [PATCH v3 4/4] cpufreq/amd-pstate: Get highest freq from CPPC if available Date: Thu, 14 May 2026 16:56:26 -0500 Message-ID: <20260514215626.35327-5-mario.limonciello@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260514215626.35327-1-mario.limonciello@amd.com> References: <20260514215626.35327-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023CC:EE_|MN2PR12MB4061:EE_ X-MS-Office365-Filtering-Correlation-Id: df031c81-0a88-4df5-fe8d-08deb203b6e6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|82310400026|36860700016|18002099003|22082099003|56012099003|11063799003; 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:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(1800799024)(82310400026)(36860700016)(18002099003)(22082099003)(56012099003)(11063799003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: qYToWvawsVJq/wWXZjus0Q2wwKYWgLkYcCiKfq3QQxZeFl5P/jrwMpQi4uAqv3uneyVelMw4aNKiEPjeH+1YW2cULXk/bxH2gsGa3MrJZyO9KoBJ9m/mVV1SdHaaD9Jm2IU4+GyzlAPq5DsFUrRc2T0XnwUWSNlqt0xDNomIs+ZS05E4Mudpq7mqjlA0gQA+vssomEhJ0fiSlSnGsFTwPP2nv3R7kWX2OlWqJLv0J0aEEQyZ5FJQ6/jUis3o7VxMNtzwk7jSLV1LQFtb3MfEYYOHFKVGcOAC3it0+JdbNHpkyHGSVs8/HNhqwerfyqCjy1WFq44zxGaLMHfDb2o1qKhm1rmeq5qyspxgC3zGzJHDRB5FhG3Xy86A5iQt/JSIKasalojxZEfwWt45GcvqH2I0XmPeyQiBIDvyr6TJczCcIBktyaIQMDWGfDkMHRcW X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 May 2026 21:56:55.5043 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: df031c81-0a88-4df5-fe8d-08deb203b6e6 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CC.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4061 If the _CPC object advertises the highest frequency for a CPU, use this instead of trying to calculate by linear interpolation. Reviewed-by: K Prateek Nayak Tested-by: K Prateek Nayak Signed-off-by: Mario Limonciello --- drivers/cpufreq/amd-pstate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index ae8d67fb374bd..3f06e33f47120 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1022,8 +1022,12 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata) WRITE_ONCE(cpudata->nominal_freq, nominal_freq); + /* max freq came from _CPC */ + if (cppc_perf.highest_freq) + max_freq = cppc_perf.highest_freq * 1000; /* max_freq is calculated according to (nominal_freq * highest_perf)/nominal_perf */ - max_freq = perf_to_freq(perf, nominal_freq, perf.highest_perf); + else + max_freq = perf_to_freq(perf, nominal_freq, perf.highest_perf); WRITE_ONCE(cpudata->max_freq, max_freq); lowest_nonlinear_freq = perf_to_freq(perf, nominal_freq, perf.lowest_nonlinear_perf); -- 2.54.0