Re: [RFC PATCH 1/3] cpufreq: Add new attribute "base_frequency"

[Viresh Kumar <viresh.kumar@linaro.org>]

On 04-09-15, 10:19, Srinivas Pandruvada wrote:
> Currently scaling_available_frequencies displays list of available
> frequencies which can be used to set max/min or current scaling
> frequency. But because of configurable thermal design power implementation
> in several Intel CPUs, this is not a guaranteed frequency or a P state,
> which user can request. After a limit all frequencies (P states) may be
> purely in opportunistic performance range. For example
> 
> >cat scaling_available_frequencies
> 2301000 2300000 2200000 2000000 1900000 1800000 1700000 1500000 1400000
> 1300000 1100000 1000000 900000 800000 600000 500000
> 
> Here traditionally it is assumed that only 2301000 is a turbo frequency,
> anything else user can request. But that is not true. Based on the
> config TDP level, this turbo (boost) start can be much below. For
> example it can be 2300000 or any other value.
> 
> This change adds an optional new attribute called "base_frequency",
> which displays the max non-turbo frequency (base frequency). For example:
> >cat base_frequency
> 2200000

This is something very much acpi-cpufreq driver's specific and I don't
really see other platform needing it. So, I would rather add this only
for acpi-cpufreq driver, if at all it is required.

-- 
viresh