linux-kernel - Re: [TEGRA194_CPUFREQ Patch v2 2/3] cpufreq: Add Tegra194 cpufreq driver

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Message-ID: <ba12496f-ac27-d4f2-dc69-d0a7e2d58679@gmail.com>
Date:   Sun, 5 Apr 2020 17:11:56 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sumit Gupta <sumitg@...dia.com>, rjw@...ysocki.net,
        viresh.kumar@...aro.org, catalin.marinas@....com, will@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com, talho@...dia.com,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     bbasu@...dia.com, mperttunen@...dia.com
Subject: Re: [TEGRA194_CPUFREQ Patch v2 2/3] cpufreq: Add Tegra194 cpufreq
 driver

04.04.2020 22:29, Sumit Gupta пишет:
...
> +static void tegra_read_counters(struct work_struct *work)
> +{
> +	struct read_counters_work *read_counters_work;
> +	struct tegra_cpu_ctr *c;
> +	u64 val;
> +
> +	/*
> +	 * ref_clk_counter(32 bit counter) runs on constant clk,
> +	 * pll_p(408MHz).

Is changing PLLP rate really impossible on T194? What makes you say that
it runs on a fixed 408MHz?