* Daniel Walker <dwalker@xxxxxxxxxx> [100507 10:15]: > On Thu, 2010-05-06 at 19:00 -0700, Tony Lindgren wrote: > > > Oh some SoC devices like omap hit retention or off modes in the idle loop. > > That brings down the idle consumption of a running system to minimal > > levels. It's basically the same as suspending the device in every idle loop. > > > > The system wakes up every few seconds or so, but that already provides > > battery life of over ten days or so on an idle system. Of course the > > wakeup latencies are in milliseconds then. > > MSM doesn't have those power states unfortunately .. Your kind of > suggesting what I was suggesting in that we should suspend in idle. Your > hardware can do it easier tho since your have power states that are > equal to suspend. You might be able to implement suspend-while-idle with cpuidle and a custom idle function on MSM. That is if MSM supports waking to a timer event and some device interrupts. However, if it only wakes to pressing some power button, then you will get missed timers and the system won't behave in a normal way. Maybe you could still kill -STOP the misbehaving apps, then keep the idle system running until some timer expires, then when no activity, echo mem > /sys/power/state? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
