linux-kernel - Re: [PATCH V4 07/14] cpufreq: mediatek: Add .get function

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Date:   Mon, 25 Apr 2022 11:05:48 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>
Cc:     rafael@...nel.org, robh+dt@...nel.org, krzk+dt@...nel.org,
        matthias.bgg@...il.com, jia-wei.chang@...iatek.com,
        roger.lu@...iatek.com, hsinyi@...gle.com, khilman@...libre.com,
        angelogioacchino.delregno@...labora.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH V4 07/14] cpufreq: mediatek: Add .get function

On 22-04-22, 15:52, Rex-BC Chen wrote:
> From: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> 
> We want to get opp frequency via opp table. Therefore, we add the function
> "mtk_cpufreq_get()" to do this.
> 
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> ---
>  drivers/cpufreq/mediatek-cpufreq.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> index e070a2619bcb..0b2ca0c8eddc 100644
> --- a/drivers/cpufreq/mediatek-cpufreq.c
> +++ b/drivers/cpufreq/mediatek-cpufreq.c
> @@ -71,6 +71,15 @@ static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
>  	return NULL;
>  }
>  
> +static unsigned int mtk_cpufreq_get(unsigned int cpu)
> +{
> +	struct mtk_cpu_dvfs_info *info;
> +
> +	info = mtk_cpu_dvfs_info_lookup(cpu);
> +
> +	return !info ? 0 : (info->opp_freq / 1000);
> +}
> +
>  static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
>  					int new_vproc)
>  {
> @@ -588,7 +597,7 @@ static struct cpufreq_driver mtk_cpufreq_driver = {
>  		 CPUFREQ_IS_COOLING_DEV,
>  	.verify = cpufreq_generic_frequency_table_verify,
>  	.target_index = mtk_cpufreq_set_target,
> -	.get = cpufreq_generic_get,
> +	.get = mtk_cpufreq_get,

The .get callback should read the real frequency from hardware instead of
fetching a cached freq value.

>  	.init = mtk_cpufreq_init,
>  	.exit = mtk_cpufreq_exit,
>  	.register_em = cpufreq_register_em_with_opp,
> -- 
> 2.18.0

-- 
viresh