* Pavel Machek <pavel@xxxxxx> [190919 09:15]:
> On Tue 2019-09-17 14:35:00, Tony Lindgren wrote:
> > We can get the low voltage interrupt trigger sometimes way too early,
> > maybe because of CPU load spikes. This causes orderly_poweroff() be
> > called too easily.
> >
> > Let's check the voltage before orderly_poweroff in case it was not
> > yet a permanent condition. We will be getting more interrupts anyways
> > if the condition persists.
> >
> > Let's also show the measured voltages for low battery and battery
> > empty warnings since we have them.
>
> Well, this is decision that will shorten battery lifetime. There's
> very little capacity left when battery is down to 3.3V...
>
> What kind of "way too early" do you see?
I've seen it trigger spontaneously already around battery low
interrupt time.
> > @@ -562,12 +562,15 @@ static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
> > switch (d->action) {
> > case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW:
> > if (latest->current_ua >= 0)
> > - dev_warn(ddata->dev, "Battery low at 3.3V!\n");
> > + dev_warn(ddata->dev, "Battery low at %i!\n",
> > + latest->voltage);
> > break;
>
> I'd still leave unit ("uV"?) there. Or do /1000, as and display mV, as
> our
> > - "Battery empty at 3.1V, powering off\n");
> > + "Battery empty at %i, powering off\n",
> > + latest->voltage);
> > orderly_poweroff(true);
>
> Same here.
Sure yeah I'll update it.
> Plus I see bigger problem: shutdown from mainline seems to leave
> something powered in the phone (I believe I seen USB charge pump, for
> example), so the battery will be completely empty next time I attempt
> to use the phone. (I learned to reboot into stock android and shutdown
> there).
>
> Phone should last days when powered off, but it seems to only last
> hours.
>
> Unfortunately I don't know how to debug that :-(.
Yes there's some issue with shutdown. I think it's somehow related
to mdm6600 being powered where the poweroff gpio does not allow
device to shut down with modem powered. We could try adding a
.power_off function to the modem code to see if it helps.
Additionally I've noticed that we leave some PMIC features powered
when device is powered off without a modem consuming about 2.5mW
while powering off from Android shows power consumption in uW
range probably with only RTC being powered.
Regards,
Tony
