linux-kernel - Re: [PATCH v4 06/13] cpufreq: amd_pstate: fix wrong lowest perf fetch

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Date:   Tue, 19 Jul 2022 08:50:45 +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 06/13] cpufreq: amd_pstate: fix wrong lowest perf fetch

On Fri, Jul 15, 2022 at 06:04:25PM +0800, Yuan, Perry wrote:
> Fix the wrong lowest perf value reading which is used for new
> des_perf calculation by governor requested, the incorrect min_perf will
> get incorrect des_perf to be set , that will cause the system frequency
> changing unexpectedly.
> 
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> Signed-off-by: Su Jinzhou <jinzhou.su@....com>

Reviewed-by: Huang Rui <ray.huang@....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 0c8256638ed7..4b764870035e 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -311,7 +311,7 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
>  		return -ENODEV;
>  
>  	cap_perf = READ_ONCE(cpudata->highest_perf);
> -	min_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
> +	min_perf = READ_ONCE(cpudata->lowest_perf);
>  	max_perf = cap_perf;
>  
>  	freqs.old = policy->cur;
> -- 
> 2.32.0
>