linux-kernel - [PATCH AUTOSEL 6.0 06/18] cpufreq: amd_pstate: fix wrong lowest perf fetch

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Message-Id: <20221009205136.1201774-6-sashal@kernel.org>
Date:   Sun,  9 Oct 2022 16:51:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Perry Yuan <Perry.Yuan@....com>, Huang Rui <ray.huang@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Su Jinzhou <jinzhou.su@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>, rafael@...nel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 6.0 06/18] cpufreq: amd_pstate: fix wrong lowest perf fetch

From: Perry Yuan <Perry.Yuan@....com>

[ Upstream commit b185c5053c65b7704ead4537e4d4d9b33dc398dc ]

Fix the wrong lowest perf value reading which is used for new
des_perf calculation by governor requested, the incorrect min_perf will
get incorrect des_perf to be set , that will cause the system frequency
changing unexpectedly.

Reviewed-by: Huang Rui <ray.huang@....com>
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
Signed-off-by: Su Jinzhou <jinzhou.su@....com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpufreq/amd-pstate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 9ac75c1cde9c..dd0eeb8589a1 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -312,7 +312,7 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
 		return -ENODEV;
 
 	cap_perf = READ_ONCE(cpudata->highest_perf);
-	min_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
+	min_perf = READ_ONCE(cpudata->lowest_perf);
 	max_perf = cap_perf;
 
 	freqs.old = policy->cur;
-- 
2.35.1