linux-kernel - Re: [PATCH v2 2/4] cpufreq: Introduce CPUFREQ_GOV_FLAG_STRICT

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Message-ID: <20201110024154.rptitysdmwyv3whh@vireshk-i7>
Date:   Tue, 10 Nov 2020 08:11:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Doug Smythies <dsmythies@...us.net>
Subject: Re: [PATCH v2 2/4] cpufreq: Introduce CPUFREQ_GOV_FLAG_STRICT_TARGET

On 09-11-20, 17:52, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Introduce a new governor flag, CPUFREQ_GOV_FLAG_STRICT_TARGET, for
> the govenors that want the target frequency to be set exactly to the
> given value without leaving any room for adjustments on the hardware
> side and set this flag for the powersave and performance governors.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/cpufreq/cpufreq_performance.c |    1 +
>  drivers/cpufreq/cpufreq_powersave.c   |    1 +
>  include/linux/cpufreq.h               |    3 +++
>  3 files changed, 5 insertions(+)
> 
> Index: linux-pm/drivers/cpufreq/cpufreq_performance.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_performance.c
> +++ linux-pm/drivers/cpufreq/cpufreq_performance.c
> @@ -20,6 +20,7 @@ static void cpufreq_gov_performance_limi
>  static struct cpufreq_governor cpufreq_gov_performance = {
>  	.name		= "performance",
>  	.owner		= THIS_MODULE,
> +	.flags		= CPUFREQ_GOV_FLAG_STRICT_TARGET,
>  	.limits		= cpufreq_gov_performance_limits,
>  };
>  
> Index: linux-pm/drivers/cpufreq/cpufreq_powersave.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_powersave.c
> +++ linux-pm/drivers/cpufreq/cpufreq_powersave.c
> @@ -21,6 +21,7 @@ static struct cpufreq_governor cpufreq_g
>  	.name		= "powersave",
>  	.limits		= cpufreq_gov_powersave_limits,
>  	.owner		= THIS_MODULE,
> +	.flags		= CPUFREQ_GOV_FLAG_STRICT_TARGET,
>  };
>  
>  MODULE_AUTHOR("Dominik Brodowski <linux@...do.de>");
> Index: linux-pm/include/linux/cpufreq.h
> ===================================================================
> --- linux-pm.orig/include/linux/cpufreq.h
> +++ linux-pm/include/linux/cpufreq.h
> @@ -575,6 +575,9 @@ struct cpufreq_governor {
>  /* For governors which change frequency dynamically by themselves */
>  #define CPUFREQ_GOV_FLAG_DYN_SWITCH	BIT(0)
>  
> +/* For governors wanting the target frequency to be set exactly */
> +#define CPUFREQ_GOV_FLAG_STRICT_TARGET	BIT(1)
> +
>  
>  /* Pass a target to the cpufreq driver */
>  unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,

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

-- 
viresh