[Letux-kernel] mixed power management observations

[Andreas Kemnade]

On Thu, 13 Apr 2017 17:56:19 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> 
> > Am 12.04.2017 um 07:28 schrieb Andreas Kemnade <andreas at kemnade.info>:
> > 
> > On Tue, 11 Apr 2017 22:25:27 +0200
> > Andreas Kemnade <andreas at kemnade.info> wrote:
> > 
> >> Here are some observations I did with the 4.10 kernel.
> >> 
> >> Suspend with usb connected in 4.10:
> >> - suspend immediately fails
> >> - bci gets a battery removal interrupt
> >> after failed suspend:
> >> devicemode.sh reenables usb access
> > hmm, devicemode.sh is not in the Letux directory...
> 
> I never missed it :)
> 
> > devicemode.sh =
> > echo peripheral > /sys/bus/platform/devices/musb-hdrc*/mode
> 
> should I add?
> 
Well, the main use is if you use the b_host.sh script and do not attach
a device... So it is not that important. I rarely use it myself. But it
does not harm if it is there.

> > 
> >> setting USBFASTMCHG enables charging again (or replugging)
> >> 
> >> after some random actions, suspend with usb connected might work but with a quite high suspend current
> 
> Looks as if something mixes up the twl4030 charger state.
> Interference between automatic modes of the twl and software?
> 
For the initial problem: I do not think so. "random actions" was
playing around with charging/usb settings and suspending several
times then it did suspend with usb connected and charging enabled that
could indeed some interference which somehow fixes some things. The
most interesting question is why
the bci thinks the battery is removed. 
I do not even know why that can happen.

Regards,
Andreas
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