Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support

From: Dietmar Eggemann
Date: Fri Jul 07 2017 - 13:06:38 EST

On 07/07/17 17:18, Rafael J. Wysocki wrote:
> On Fri, Jul 7, 2017 at 6:01 PM, Dietmar Eggemann
> <dietmar.eggemann@xxxxxxx> wrote:
>> On 06/07/17 11:40, Viresh Kumar wrote:
>>> On 06-07-17, 10:49, Dietmar Eggemann wrote:


>> So what about I call arch_set_freq_scale() in __cpufreq_notify_transition() in the
>> CPUFREQ_POSTCHANGE case for slow-switching and in cpufreq_driver_fast_switch() for
>> fast-switching?
> Why don't you do this in drivers instead of in the core?
> Ultimately, the driver knows what frequency it has requested, so why
> can't it call arch_set_freq_scale()?

That's correct but for arm/arm64 we have a lot of different cpufreq
drivers to deal with. And doing this call to arch_set_freq_scale() once
in the cpufreq core will cover them all.