linux-kernel - Re: [PATCH v3 09/13] cpufreq: amd-pstate: update pstate frequency transition delay time

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Message-ID: <20220713052859.7h7uaddpyvqaty2v@vireshk-i7>
Date:   Wed, 13 Jul 2022 10:58:59 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Perry Yuan <Perry.Yuan@....com>
Cc:     rafael.j.wysocki@...el.com, Ray.Huang@....com,
        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,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v3 09/13] cpufreq: amd-pstate: update pstate frequency
 transition delay time

On 12-07-22, 11:42, Perry Yuan wrote:
> change the default transition latency to be 20ms that is more
> reasonable transition delay for AMD processors in non-EPP driver mode.
> 
> 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 312ccef62f58..1e5ca4897b7e 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
>  
>  /*

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh