[PATCH v5 6/7] cpufreq: amd-pstate: update pstate frequency transition delay time

Perry Yuan
2022-08-14T16:52:13Z

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