On Tue, 6 Feb 2018 10:16:23 -0800 Tony Lindgren <tony@xxxxxxxxxxx> wrote: > * Andreas Kemnade <andreas@xxxxxxxxxxxx> [180206 18:04]: > > On Tue, 6 Feb 2018 09:17:37 -0800 > > Tony Lindgren <tony@xxxxxxxxxxx> wrote: > > > uarts=$(find /sys/class/tty/tty[SO]*/power/ -type d 2>/dev/null) > > > for uart in $uarts; do > > > echo enabled > $uart/wakeup 2>&1 > > > echo auto > $uart/control 2>&1 > > > done > > > > > > > hmm, this looks a bit like runtime suspend. > > Not only that, it enables wakeup for UART also for suspend :) > We are using the rtc for wakeup and measure discharge of battery for a time frame of about 300 seconds. > That is if your dts has it configured with interrupts-extended > for the console UART like omap3-beagle-xm.dts has for example. > Seems like the gta04 dts don't have these.. And you also want > to have chosen with stdout-path = &uart3 or whatever the debug > UART is for earlycon to work. > > > I mean suspend aka echo mem >/sys/power/state > > > > > echo -n 1 > /sys/kernel/debug/pm_debug/enable_off_mode > > And the above will enable SoC and PMIC off modes, which will also > take the suspend power to some much much lower value :) You need > to configure the PMIC too depending if the oscillator can be turned > off, in that case set "ti,twl4030-power-idle-osc-off". That too > seems to be missing in gta04 dts files.. > It was in our tree. It can be enabled for the gta04a5. We have even done that. But then suspend while charging breaks. I have no idea how to do a proper if-not-charging-power-idle-osc-off patch... Yes there are other places where we can optimize suspend current. But lets first find out why ehci-omap seems to cause trouble here. So we are looking for around 15mA of additional suspend current when the module is loaded. Shouldn't the reset line of the phy (usb-nop-xceiv) be set to low when going to suspend? I do not see code how to do it. I guess that is the reason. BTW: root@letux:~# cat /sys/bus/platform/devices/48064800.ehci/power/runtime_status active Regards, Andreas
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