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From:   Perry Yuan <Perry.Yuan@amd.com>
To:     <rafael.j.wysocki@intel.com>, <viresh.kumar@linaro.org>,
        <Ray.Huang@amd.com>, Huang Rui <ray.huang@amd.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <Deepak.Sharma@amd.com>, <Mario.Limonciello@amd.com>,
        <Nathan.Fontenot@amd.com>, <Alexander.Deucher@amd.com>,
        <Jinzhou.Su@amd.com>, <Xinmei.Huang@amd.com>,
        <Xiaojian.Du@amd.com>, <Li.Meng@amd.com>,
        Perry Yuan <Perry.Yuan@amd.com>
Subject: [PATCH 07/12] cpufreq: amd_pstate: map desired perf into pstate scope for powersave governor
Date:   Thu, 7 Jul 2022 13:00:22 -0400
Message-ID: <20220707170022.216202-1-Perry.Yuan@amd.com>
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The patch will fix the invalid desired perf value for powersave
governor. This issue is found when testing on one AMD EPYC system, the
actual des_perf is smaller than the min_perf value, that is invalid
value. because the min_perf is the lowest_perf system can support in
idle state.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 7c51f4125263..154eed849f38 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -317,6 +317,7 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
 	des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf,
 				     cpudata->max_freq);
 
+	des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
 	cpufreq_freq_transition_begin(policy, &freqs);
 	amd_pstate_update(cpudata, min_perf, des_perf,
 			  max_perf, false);
-- 
2.25.1