On Mon, Jul 11, 2011 at 04:14:24AM -0700, Tony Lindgren wrote: > * Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> [110711 03:59]: > > Right, but it can be interesting to tell the PMIC that we went into this > > mode. Possibly cpuidle will end up doing this as a result of signals > > generated as the CPU core goes down, but at that point it's just s2ram > > by another name. > All PMIC devices should be shut down when not in use, so I don't know > what else you would configure in the PMIC. Maybe you have something else > there to configure? Just curious what kind of mess you have to deal with > compared to the mess I need to deal with :) The interesting bits are things like being able to kill lots of the SoC core supplies when the RAM is in retention mode - the CPU needs to go through its shutdown procedures. > Also, hitting deeper sleep states from idle is not same as suspend to ram. > With suspend to ram the system timer is killed while timers behave in a > normal way when hitting deeper sleep states from idle. Actually, it just occurred to me that if we're waiting for a system timer and can hand that off to a suitable timer in the PMIC then we can do a suspend to RAM for the deep idle state from the hardware point of view. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
