On 01/04/12 22:08, Scott Wood wrote: ...
It's been a while since I've touched this, but IIRC the PMC events are mainly important for deep sleep, and for normal sleep (standby) you can wake from any interrupt other than core interrupts like timebase. I'm not sure to what extent setting PMCCR[SLPEN] affects this -- I don't see where the documentation says what "system low power state" means. I would be surprised if GPIO were affected, though, since it's supported as a wakeup source even in deep sleep. I think I was able to wake from standby on a UART interrupt even with SLPEN set. Are you sure the GPIO block is asserting an interrupt, and that it hasn't been masked during the preparation for standby? What happens if you modify mpc6xx_enter_standby() to not actually set MSR_POW?
thanks for your response. not setting MSR_POW gives same result. if I set kernel.powersave-nap=1 it works fine, so apparently NAP/DOZE mode does work (if CPU is idle). This saves almost no power though. Standby mode saves about 300-500 mW. The problem could well be our board though, today I learned it does work by connecting an (inactive) JTAG debugger. Also, on another board it always works. And indeed wake-up occurs through GPIO interrupt or UART interrupt (key press on console). --- NvBolhuis _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
