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

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Date:   Sun, 8 Apr 2018 09:50:38 -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 09:04]:
> I guess I'd like to test this on Droid4; there are fso-gsm0710muxd and
> gsm0710muxd packages in Debian, but I assume those do multiplexing in
> userspace and thus are not suitable?

I don't think those are needed, we now have kernel n_gsm driver do
most of the work for us :) Doing ldattach config is still needed,
but eventually we should have a serdev driver do that too for us.

So apps should only do the ldattach part if node yet already done,
and just attempt to use /dev/gsmtty* ports directly.

I did get serdev working with n_gsm several weeks ago with horrible
hacks, it needs quite a bit more work though before it's ready..

Then we need to add proxying of some /dev/gsmtty* ports to W3GLTE to
get that working (US only AFAIK for the band). It might make sense
to add the proxy features to ModemManager eventually.

> 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/

Sorry could not resist adding a test call feature too :)

Hmm it might be best to add the ts27010 support and proxying
eventually to ModemManager? I think ofono and others could still
use the /dev/gsmtty* ports for the modem as needed too?

Regards,

Tony