Re: [PATCH] clocksource/arm_global_timer: reconfigure clockevents after cpufreq change

[Alexander Kochetkov]

Hello Thomas!

> 29 ÐÐÑÐ. 2016 Ð., Ð 16:42, Thomas Gleixner <tglx@xxxxxxxxxxxxx> ÐÐÐÐÑÐÐ(Ð):
> 
> The frequency change would not only affect the clockevent device, it also
> would affect the clocksource. So the patch is incomplete, but see below.
Looks like kernel disallow change clocksource and shed_clock rate at
runtime. I havenât found any function for that.

> 29 ÐÐÑÐ. 2016 Ð., Ð 16:42, Thomas Gleixner <tglx@xxxxxxxxxxxxx> ÐÐÐÐÑÐÐ(Ð):
> 
> That's broken and the clk framework should keep the CORE_PERI clock at a
> constant rate by reprogramming the divider of the CPU clock.

Thank you for the hint.

> Assumptions w/o real impact are a perfect reason not to apply that
> patch. This want's a proper proof that the global timer really changes and
> this hackery is required, which I seriously doubt.

It really changes. It changes like it changes for smp-twd. I guess they are
driven by same clock CORE_PERI.

Thank you for help.

Alexander.