Re: [PATCH 1/2] cpufreq: Return error if ->get() failed in cpufreq_update_policy()

[Viresh Kumar]

On 26 February 2014 13:15, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> On 26 February 2014 03:59, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>> Yes, what exactly do we need it for in the core?
>
> Its probably there to make things faster. We cache the value so that we
> don't go to the hardware to read/calculate that again. Isn't it?
>
> And we need to know current freq on many occasions. One of that is that
> many drivers need to know the relation between current and new freq before
> they can make the change. As they might need to play with volt regulators
> before or after the freq change. Also it is used mainly in our loops_per_jiffiy
> calculations.

Ping!!
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