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b=KaTlZxt8I/0O7QaEs5DmjZw1fbcn+JfXvTpG851xWOITL1LOYgHWATwufy58ceSTP0KNC6Tzw9tjx8OBqDaI4mxvjEX8MSQET+ctsF5RLVBL4ob6GF0hC8uBgNYYZ//uwziZavbVea25VZsk+gb/am2rT2p1irxcGE9j++g0zBc= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) by IA0PPF64A94D5DF.namprd12.prod.outlook.com (2603:10b6:20f:fc04::bd0) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9499.2; Wed, 7 Jan 2026 21:24:39 +0000 Received: from MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::37ee:a763:6d04:81ca]) by MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::37ee:a763:6d04:81ca%7]) with mapi id 15.20.9478.004; Wed, 7 Jan 2026 21:24:39 +0000 Message-ID: <25a4653c-4d95-44c7-a957-c3ac9da214ad@amd.com> Date: Wed, 7 Jan 2026 15:24:31 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] cpufreq/amd-pstate: Fix MinPerf MSR value for performance policy To: Juan Martinez , gautham.shenoy@amd.com Cc: rafael@kernel.org, viresh.kumar@linaro.org, perry.yuan@amd.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Kaushik Reddy S , Huang Rui References: <20260107211919.38010-1-juan.martinez@amd.com> Content-Language: en-US From: Mario Limonciello In-Reply-To: <20260107211919.38010-1-juan.martinez@amd.com> Content-Type: text/plain; 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The MinPerf field should be set to this value even in performance > mode to maintain proper power/performance characteristics. > > This fixes a regression introduced by commit 0c411b39e4f4c ("amd-pstate: Set > min_perf to nominal_perf for active mode performance gov"), which correctly > identified that highest_perf was too high but chose nominal_perf as an > intermediate value instead of lowest_nonlinear_perf. > > The fix changes amd_pstate_update_min_max_limit() to use lowest_nonlinear_perf > instead of nominal_perf when the policy is CPUFREQ_POLICY_PERFORMANCE. > > [1] https://docs.amd.com/v/u/en-US/24593_3.43 > AMD64 Architecture Programmer's Manual Volume 2: System Programming > Section 17.6.4.1 CPPC_CAPABILITY_1 > (Referenced in commit 5d9a354cf839a) > > Fixes: 0c411b39e4f4c ("amd-pstate: Set min_perf to nominal_perf for active mode performance gov") > Tested-by: Kaushik Reddy S > Cc: stable@vger.kernel.org > Signed-off-by: Juan Martinez I think this change is reasonable, but I'd like to get Gautham's comments as the original author of 0c411b39e4f4c. > --- > drivers/cpufreq/amd-pstate.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index e4f1933dd7d47..de0bb5b325502 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -634,8 +634,8 @@ static void amd_pstate_update_min_max_limit(struct cpufreq_policy *policy) > WRITE_ONCE(cpudata->max_limit_freq, policy->max); > > if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) { > - perf.min_limit_perf = min(perf.nominal_perf, perf.max_limit_perf); > - WRITE_ONCE(cpudata->min_limit_freq, min(cpudata->nominal_freq, cpudata->max_limit_freq)); > + perf.min_limit_perf = min(perf.lowest_nonlinear_perf, perf.max_limit_perf); > + WRITE_ONCE(cpudata->min_limit_freq, min(cpudata->lowest_nonlinear_freq, cpudata->max_limit_freq)); > } else { > perf.min_limit_perf = freq_to_perf(perf, cpudata->nominal_freq, policy->min); > WRITE_ONCE(cpudata->min_limit_freq, policy->min);