linux-kernel - Re: [PATCH v2] USB: serial: qcserial: Support for SDX55 based Sierra Wireless 5G modules

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Date:   Thu, 1 Jul 2021 18:41:26 +0200
From:   Stefan Brüns <stefan.bruens@...h-aachen.de>
To:     Johan Hovold <johan@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Daniele Palmas <dnlplm@...il.com>,
        Bjørn Mork <bjorn@...k.no>
Subject: Re: [PATCH v2] USB: serial: qcserial: Support for SDX55 based Sierra Wireless 5G modules

On Donnerstag, 24. Juni 2021 09:28:59 CEST Johan Hovold wrote:
> [ +CC: Daniele and Bjørn ]
> 
> On Fri, Jun 11, 2021 at 03:58:41PM +0200, Stefan Brüns wrote:
> > The devices exposes two different interface compositions:
> > - QDL mode, single interface
> > - MBIM mode, MBIM class compliant plus AT/DM(/ADB)
> > 
> > Current firmware versions (up to 01.07.19) do not expose an NMEA port.
> 
> We already have at least one SDX55 based modem (FN980) supported by the
> option driver. Any particular reason why you chose to add it to qcserial
> instead of option?
> 
Support for qualcomm based modems are spread over option and qcserial. All 
other Sierra devices are supported by qcserial.
 
> Note that the FN980 also needs the ZLP flag set in QDL (flashing) mode,
> I'd assume this one needs it too.

It depends if you implement the Firehose protocol in accordance to the 
specification or not. 80-NG319-1 (Firehose specification) explicitly states to 
pad any XML command packet which is an exact multiple of 512 bytes with an 
extra newline or other whitespace character.

Regards,

Stefan

-- 
Stefan Brüns  /  Bergstraße 21  /  52062 Aachen
home: +49 241 53809034     mobile: +49 151 50412019
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