On 14 May 2015 at 18:36, Mason <slash.tmp@xxxxxxx> wrote: > When I execute "echo 18500 > scaling_max_freq" > the system is supposed to change the CPU frequency to 18.5 MHz > (I might have a bug lurking there) and PERIPHCLK is 1/2 of that, > i.e 9.25 MHz. So at least we are on the right path. But it looks to me that this call is not getting propagated well. >From the attachment you gave initially, the event handler for twd-timers is: tick_handle_periodic(). i.e. you are running in periodic mode and not onshot... why ? > Yes, I do, but I was trying to use as much generic code as > possible to limit the chances of introducing bugs. Hmm.. > I'll take a fresh look at the ARM GLOBAL TIMER, but last I > checked, it didn't seem to handle frequency scaling. why is that required? Why will you change its freq ? The same timer is probably used for SPEAr (the platform I used to work on): http://lxr.free-electrons.com/source/arch/arm/mach-spear/time.c?v=3.14 -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
