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

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Date:   Tue, 19 Jul 2022 09:04:59 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Yuan, Perry" <Perry.Yuan@....com>
Cc:     "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 11/13] cpufreq: amd_pstate: update transition delay
 time to 1ms

On Fri, Jul 15, 2022 at 06:04:30PM +0800, Yuan, Perry wrote:
> 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>

Please squeeze this patch into patch 9. I don't really want to separate the
transition marco update as two patches.

Thanks,
Ray

> ---
>  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
>