linux-kernel - [PATCH v4 09/13] cpufreq: amd-pstate: update pstate frequency transition delay time

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Message-ID: <507e6164192c0922d3101591edc6ba39f27556a1.1657876961.git.Perry.Yuan@amd.com>
Date:   Fri, 15 Jul 2022 06:04:28 -0400
From:   Perry Yuan <Perry.Yuan@....com>
To:     <rafael.j.wysocki@...el.com>, <viresh.kumar@...aro.org>,
        <Ray.Huang@....com>
CC:     <Deepak.Sharma@....com>, <Mario.Limonciello@....com>,
        <Nathan.Fontenot@....com>, <Alexander.Deucher@....com>,
        <Jinzhou.Su@....com>, <Xinmei.Huang@....com>,
        <Xiaojian.Du@....com>, <Li.Meng@....com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Perry Yuan <Perry.Yuan@....com>
Subject: [PATCH v4 09/13] cpufreq: amd-pstate: update pstate frequency transition delay time

change the default transition latency to be 20ms that is more
reasonable transition delay for AMD processors in non-EPP driver mode.

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
---
 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 acb62ec5ebab..c29d36f56ab4 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -41,7 +41,7 @@
 #include <asm/msr.h>
 #include "amd-pstate-trace.h"
 
-#define AMD_PSTATE_TRANSITION_LATENCY	0x20000
+#define AMD_PSTATE_TRANSITION_LATENCY	20000
 #define AMD_PSTATE_TRANSITION_DELAY	500
 
 /*
-- 
2.32.0