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

[sumitg]

On 05/04/20 7:41 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 04.04.2020 22:29, Sumit Gupta ÐÐÑÐÑ:
> ...
> > +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?
Pasting below from TRM.
Register "NVFREQ_FEEDBACK_EL1":
....
[31:0] PLLP counter: This counter counts at a fixed frequency (408 MHz).