linux-kernel - Re: [PATCH V2 07/15] cpufreq: mediatek: Add opp notification for SVS support

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Message-ID: <7hsfqn5nft.fsf@baylibre.com>
Date:   Fri, 08 Apr 2022 13:29:10 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, rafael@...nel.org,
        viresh.kumar@...aro.org, robh+dt@...nel.org, krzk+dt@...nel.org
Cc:     matthias.bgg@...il.com, jia-wei.chang@...iatek.com,
        roger.lu@...iatek.com, hsinyi@...gle.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,
        "Andrew-sh.Cheng" <andrew-sh.cheng@...iatek.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>
Subject: Re: [PATCH V2 07/15] cpufreq: mediatek: Add opp notification for
 SVS support

Rex-BC Chen <rex-bc.chen@...iatek.com> writes:

> From: "Andrew-sh.Cheng" <andrew-sh.cheng@...iatek.com>
>
> The Smart Voltage Scaling (SVS) is a hardware which calculates suitable
> SVS bank voltages to OPP voltage table.
>
> When the SVS is enabled, cpufreq should listen to opp notification and do
> proper actions when receiving events of disable and voltage adjustment.

So listenting for OPP notifications should be done only when SVS is enabled...

[...]

>  static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
>  {
>  	struct device *cpu_dev;
> @@ -392,6 +455,17 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
>  	info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
>  	dev_pm_opp_put(opp);
>  
> +	info->opp_cpu = cpu;
> +	info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
> +	ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);

...but here youlisten to OPP notifications unconditionally.  Seems there
should be a check whether SVS is enabled before deciding to register.

Kevin