Hi Viresh, On Thursday 31 of January 2013 09:50:37 Viresh Kumar wrote: > On Tue, Nov 13, 2012 at 2:56 PM, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote: > > On Exynos SoCs all cores share the same frequency setting, so changing > > frequency of one core will affect rest of cores. > > > > This patch modifies the exynos-cpufreq driver to inform cpufreq core > > about this behavior and broadcast frequency change notifications for > > all cores. > > > > /* When the new frequency is lower than current frequency */ > > if ((freqs.new < freqs.old) || > > > > @@ -235,6 +237,7 @@ static int exynos_cpufreq_cpu_init(struct > > cpufreq_policy *policy)> > > cpumask_copy(policy->related_cpus, cpu_possible_mask); > > cpumask_copy(policy->cpus, cpu_online_mask); > > > > } else { > > > > + policy->shared_type = CPUFREQ_SHARED_TYPE_ANY; > > > > cpumask_setall(policy->cpus); > > I couldn't understand the use of this change. Can you please explain ? All cores on Exynos SoCs share the same clock source, which means that they all always run at the same frequency. So setting frequency on one core sets the frequency on all cores and so it doesn't matter on which core the frequency setting operation is done. As you can see in include/linux/cpufreq.h: #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ which basically tells (together with rest of the patch) the cpufreq subsystem about what I wrote earlier. Best regards, -- Tomasz Figa Samsung Poland R&D Center SW Solution Development, Linux Platform -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html