linux-kernel - Re: [PATCH v1 5/5] cpufreq: CPPC: Enable dvfs_possible_from_any

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Message-ID: <20220512074712.oaf7qaqeds5hlg63@vireshk-i7>
Date:   Thu, 12 May 2022 13:17:12 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Pierre Gondois <pierre.gondois@....com>
Cc:     linux-kernel@...r.kernel.org, Ionela.Voinescu@....com,
        Dietmar.Eggemann@....com, "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
        devel@...ica.org
Subject: Re: [PATCH v1 5/5] cpufreq: CPPC: Enable dvfs_possible_from_any_cpu

On 11-05-22, 15:45, Pierre Gondois wrote:
> From: Pierre Gondois <Pierre.Gondois@....com>
> 
> The communication mean of the _CPC desired performance can be
> PCC, System Memory, System IO, or Functional Fixed Hardware (FFH).
> 
> PCC, SystemMemory and SystemIo address spaces are available from any
> CPU. Thus, dvfs_possible_from_any_cpu should be enabled in such case.
> For FFH, let the FFH implementation do smp_call_function_*() calls.
> 
> Signed-off-by: Pierre Gondois <pierre.gondois@....com>
> ---
>  drivers/cpufreq/cppc_cpufreq.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> index 000a0c610c30..ad1535fbf389 100644
> --- a/drivers/cpufreq/cppc_cpufreq.c
> +++ b/drivers/cpufreq/cppc_cpufreq.c
> @@ -558,6 +558,7 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
>  	}
>  
>  	policy->fast_switch_possible = cppc_allow_fast_switch();
> +	policy->dvfs_possible_from_any_cpu = true;
>  
>  	/*
>  	 * If 'highest_perf' is greater than 'nominal_perf', we assume CPU Boost

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

-- 
viresh