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

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Message-ID: <20180408235740.GN5700@atomide.com>
Date:   Sun, 8 Apr 2018 16:57:40 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Alan Cox <alan@...yncelyn.cymru>,
        Dan Williams <dcbw@...hat.com>,
        Jiri Prchal <jiri.prchal@...ignal.cz>,
        Jiri Slaby <jslaby@...e.cz>, Marcel Partap <mpartap@....net>,
        Merlijn Wajer <merlijn@...zup.org>,
        Michael Nazzareno Trimarchi <michael@...rulasolutions.com>,
        Michael Scott <michael.scott@...aro.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Russ Gorby <russ.gorby@...el.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 1/2] tty: n_gsm: Fix long delays with control frame
 timeouts in ADM mode

* Pavel Machek <pavel@....cz> [180408 19:07]:
> 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.

Regards,

Tony