> [EMAIL PROTECTED] On Behalf Of Igor Stoppa > On Fri, 2008-08-15 at 12:55 +0300, Högander Jouni wrote: > > > Using them both would also generate more complexity. What would be the > > benefit in using them both? > > The RTC should be used during suspend since it's supposed to keep track > of time regardless of how long the duration of the suspension is. > > The 32kHz alone is not a good generic solution since it overflows after > a couple of days.
Couple notes over time. In some older suspend code, an overflow interrupt was programmed which woke and re-slept. The code path never left the local suspend function. This allowed ok time to be kept over a longer time. Using the RTC if it is I2C can only happen a little later in the wake up flow. Seems some pieces used to get confused if the notion of time was not updated a bit earlier. If you do rapid suspend/resume when you don't have a good cpuidle some of these things become issues. Main comment is overflow for suspend can work with out rtc. Regards, Richard W.
