From: Perry Yuan <Perry.Yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <ray.huang@amd.com>,
<viresh.kumar@linaro.org>
Cc: <Deepak.Sharma@amd.com>, <Mario.Limonciello@amd.com>,
<Nathan.Fontenot@amd.com>, <Alexander.Deucher@amd.com>,
<Jinzhou.Su@amd.com>, <Shimmer.Huang@amd.com>,
<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Perry Yuan <Perry.Yuan@amd.com>
Subject: [PATCH v5 6/7] cpufreq: amd-pstate: update pstate frequency transition delay time
Date: Mon, 15 Aug 2022 00:35:47 +0800 [thread overview]
Message-ID: <20220814163548.326686-7-Perry.Yuan@amd.com> (raw)
In-Reply-To: <20220814163548.326686-1-Perry.Yuan@amd.com>
Change the default transition latency to be 20ms that is more
reasonable transition delay for AMD processors in non-EPP driver mode.
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@linaro.org>
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
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 e40177d14310..9cb051d61422 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -41,8 +41,8 @@
#include <asm/msr.h>
#include "amd-pstate-trace.h"
-#define AMD_PSTATE_TRANSITION_LATENCY 0x20000
-#define AMD_PSTATE_TRANSITION_DELAY 500
+#define AMD_PSTATE_TRANSITION_LATENCY 20000
+#define AMD_PSTATE_TRANSITION_DELAY 1000
/*
* TODO: We need more time to fine tune processors with shared memory solution
--
2.34.1
next prev parent reply other threads:[~2022-08-14 16:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-14 16:35 [PATCH v5 0/7] AMD Pstate Enhancement And Issue Fixs Perry Yuan
2022-08-14 16:35 ` [PATCH v5 1/7] cpufreq: amd-pstate: cleanup the unused and duplicated headers declaration Perry Yuan
2022-08-15 15:04 ` Punit Agrawal
2022-09-01 5:34 ` Yuan, Perry
2022-08-14 16:35 ` [PATCH v5 2/7] cpufreq: amd-pstate: simplify cpudata pointer assignment Perry Yuan
2022-08-14 16:35 ` [PATCH v5 3/7] cpufreq: amd-pstate: fix white-space Perry Yuan
2022-08-31 19:07 ` Rafael J. Wysocki
2022-08-14 16:35 ` [PATCH v5 4/7] cpufreq: amd_pstate: fix wrong lowest perf fetch Perry Yuan
2022-08-15 15:05 ` Punit Agrawal
2022-08-31 8:53 ` Yuan, Perry
2022-09-01 14:58 ` Punit Agrawal
2022-08-14 16:35 ` [PATCH v5 5/7] cpufreq: amd_pstate: map desired perf into pstate scope for powersave governor Perry Yuan
2022-08-14 16:35 ` Perry Yuan [this message]
2022-08-15 15:05 ` [PATCH v5 6/7] cpufreq: amd-pstate: update pstate frequency transition delay time Punit Agrawal
2022-08-16 7:02 ` Yuan, Perry
2022-08-16 16:03 ` Punit Agrawal
2022-08-14 16:35 ` [PATCH v5 7/7] cpufreq: amd-pstate: add ACPI disabled check in acpi_cpc_valid() Perry Yuan
2022-08-25 11:56 ` Rafael J. Wysocki
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