On Tue, Jan 3, 2012 at 3:54 PM, Bedia, Vaibhav <vaibhav.bedia@xxxxxx> wrote: > Hi Govindraj, > > On Mon, Jan 02, 2012 at 16:00:37, Govindraj wrote: >> >> currently runtime pm is available from omap-serial device and not from tty_dev. >> Setting tty_dev wakeup is to use irq_wakeup from suspend available >> from serail_core layer which I think we are not using for omap-uart >> and we use pad wakeup from suspend path. >> >> Also omap-uart.x/power/wakeup is used to gate uart clocks using runtime >> PM api's in omap-serial driver. >> > > Thanks for clarifying. On AM335x, one of the UARTs is in a wakeup domain > and swakeup from this is used to come out of suspend. > > I have basic suspend-resume working on it. Strangely this works irrespective > of the value of tty_dev wakeup entry. Do you know if this is expected on OMAP? > AFAIK yes. > The other issue concerning runtime PM is that as soon as I set a non-zero to > the autosuspend_delay_ms I get some garbage characters and eventually the > console stops responding. > > [root@arago /]# cat .../omap_uart.0/power/autosuspend_delay_ms > -1 > [root@arago /]# echo 3000 > ÖKWëé«+×é«+wU.Éѹ,z,½Ý.ɽosuspend_delayÕ£½ÍÕÍ... > [root@arago /]# <- No response after some time > try enabling CONFIG_CPU_IDLE for pm qos_usage from uart driver. -- Thanks, Govindraj.R -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
