[Letux-kernel] wwan logic inversion

Andreas Kemnade andreas at kemnade.info
Sat Nov 24 21:02:23 CET 2018


Hi,

On Sat, 24 Nov 2018 15:51:55 +0100
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi Andreas,
> 
> > Am 24.11.2018 um 12:17 schrieb Andreas Kemnade <andreas at kemnade.info>:
> > 
> > Hi Nikolaus,
> > 
> > On Sat, 24 Nov 2018 09:29:38 +0100
> > "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> >   
> >> 
> >> Here it seems to query the modem status pin (gpio value = 0/1).
> >> 
> >> Hope this helps to find out what is really going on.
> >>   
> > well, modem was in bad initial state  
> 
> ah, I see. How did it come into that state? Can we/do we need to protect against it?
> The only sequence I am aware of:
> 
> 1. boot
> 2. rfkill unblock wwan
> 3. warm reset by external hardware (not a sudo reboot because there can be a rfkill block in init.d/systemd shutdown config)
> 4. boots again and assumes modem is off
> 
the wwan-on-off has even a poweroff, so nothing at shutdown should be
needed.
But you can press the power button for 10 seconds and force-off most
things.

Regards,
Andreas
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