On 04-06-15, 14:25, Yuantian.Tang@xxxxxxxxxxxxx wrote: > From: Tang Yuantian <Yuantian.Tang@xxxxxxxxxxxxx> > > Each time the CPU switches its frequency, the clock nodes in > DTS are walked through to find proper clock source. This is > very time-consuming, for example, it is up to 500+ us on T4240. > Besides, switching time varies from clock to clock. > To optimize this, each input clock of CPU is buffered, so that > it can be picked up instantly when needed. > > Since for each CPU each input clock is stored in a pointer > which takes 4 or 8 bytes memory and normally there are several > input clocks per CPU, that will not take much memory as well. Not sure how it got included in this form in the first place. :) > Signed-off-by: Tang Yuantian <Yuantian.Tang@xxxxxxxxxxxxx> > --- > drivers/cpufreq/qoriq-cpufreq.c | 32 +++++++++++++++++++++----------- > 1 file changed, 21 insertions(+), 11 deletions(-) Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx> -- viresh -- 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
