On Tue, 1 Sep 2015 11:32:36 +0530 Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote: > On 01-09-15, 13:36, vichy wrote: > > >> I try to call below 2 functions to change the frequency of clocksource > > >> and clockevent, but the above b) sleep time is still incorrect when > > >> cpu runs in 500Mhz. > > >> clockevents_update_freq(this_cpu_ptr(gt_evt), gt_clk_rate); > > >> __clocksource_updatefreq_hz(>_clocksource, gt_clk_rate); > > How and when were you calling them? What kernel version is it ? > > > Clock Event Device: arm_global_timer > > This driver doesn't have support to update clkevt device's freq. You > may need to modify that based on how arch/arm/kernel/smp_twd.c is > updated. look for: clockevents_update_freq(). > This can only help the clockevent. Even with this cpufreq notifier update, the globaltimer clocksource still can't hold correct/accurate time. I think the arm global timer is not suitable for clocksource if cpufreq is enabled. -- 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
