Re: [PATCH 1/2] tty: n_gsm: Fix long delays with control frame timeouts in ADM mode

Pavel Machek
2018-04-09T10:54:07Z

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Hi!

> > > > Do you have a tool to use and a script?
> > >
> > > Yes I used the shell script I posted earlier, but forgot it also
> > > needs the ldattach done.
> > >
> > > Anyways, last night and today I wrote a quick test utility called
> > > droid4-ngsm that initializes things and I can use to do some
> > > experiments to get the ts27010 channel proxying to W3GLTE also
> > > going:
> > >
> > > http://github.com/tmlind/droid4-ngsm/
> >
> > Ok, now i'm confused. It wants to bind to ttyS0, but modem is on
> > ttyUSB4 AFAICT? Or is the modem connected to serial port, too? (Do I
> > need to enable some more drivers for that?)
> >
> > I do have ttyS0, but I don't think there's anything attached there. Or
> > is ttyS0 for the LTE modem?
>
> The ttyS0 is connected to mdm6600, and ttyUSB4 seems to be
> some buggy subset of ttyS0 n_gsm dlci1. You need need at least
> the following commits in current mainline kernel:
>
> 984c7706ff18 ("ARM: dts: omap4-droid4: Configure uart1 pins")
> e5b9fd7bdeb5 ("ARM: dts: omap4-droid4: Configure MDM6600 USB PHY")
>
> And then you need PHY_MAPPHONE_MDM6600 and CONFIG_N_GSM enabled.

Ok, I should have all that enabled. But droid4-ngsm still fails:

user@devuan:/my/droid4-ngsm$ sudo ./droid4-ngsm
Starting ngsm..
Testing ngsm..
Could not open /dev/gsmtty1: Level 2 halted
Trying to start ngsm again: Level 2 halted
Starting ngsm..

commit 984c7706ff180e33096c57183435d925cb644576 says:

ARM: dts: omap4-droid4: Configure uart1 pins

These are needed to use the n_gsm driver for TS 27.010 UART
multiplexing. Note that support for the OOB wake gpio is still
missing so the UART is not yet usable for n_gsm.

...am I still missing the OOB wake gpio support?

Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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