linux-kernel - [PATCH v4 11/13] cpufreq: amd_pstate: update transition delay time to 1ms

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Message-ID: <c1b46c68d521ff2c8ed49a6e8f5ad75ce51fb772.1657876961.git.Perry.Yuan@amd.com>
Date:   Fri, 15 Jul 2022 06:04:30 -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 11/13] cpufreq: amd_pstate: update transition delay time to 1ms

Update transition delay time to 1ms, in the AMD CPU autonomous mode and
non-autonomous mode, CPPC firmware will decide frequency at 1ms timescale
based on the workload utilization.

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Perry Yuan <Perry.Yuan@....com>
Signed-off-by: Su Jinzhou <Jinzhou.Su@....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 4f8600a36194..d3bc441b3923 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -42,7 +42,7 @@
 #include "amd-pstate-trace.h"
 
 #define AMD_PSTATE_TRANSITION_LATENCY	20000
-#define AMD_PSTATE_TRANSITION_DELAY	500
+#define AMD_PSTATE_TRANSITION_DELAY	1000
 
 /*
  * TODO: We need more time to fine tune processors with shared memory solution
-- 
2.32.0