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: <20180410110944.GB13697@amd>
Date:   Tue, 10 Apr 2018 13:09:44 +0200
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
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

On Mon 2018-04-09 06:42:59, Tony Lindgren wrote:
> * Pavel Machek <pavel@....cz> [180409 10:56]:
> > Ok, I should have all that enabled. But droid4-ngsm still fails:
> > 
> > user@...uan:/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..
> 
> I guess you must have phy-mapphone-mdm6600 enabled as you a have
> working modem over USB. What do you see in dmesg if you enable n_gsm
> debug with modprobe n_gsm debug=0xff or on kernel cmdline?

Ok, I guess I can do that, but first:

Should the modem respond to AT commands on ttyS0? I launched minicom
(115200 8N1) and I'm not getting any responses.

> > 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?
> 
> We can get away without OOB wake gpio for a while as mdm6600 is not
> yet suspended over USB. But if you have manually suspended mdm6600
> USB interface via /sys, then it won't respond properly on n_gsm
> either.

Ahha, ok.

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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