[PATCH] qmi-firmware-update: support USB3->USB2 mode changes during upgrade

[Paul Gildea]

Was thinking about this again on it's anniversary, as it's becoming more of
an issue, both due to upgrading MC7455's but also since getting EM7455's
recently.
For the upgrade using peers, I'm going to have a look now at the code to
decipher it and maybe change it, haven't used the language much. I think
the S/N method sounds good. The upgrade pause suggested by Aleksander would
be good since S/N's can match.
Alternatively, I was thinking that being able to manually enter a path for
the peer as a parameter when upgrading would be good? Or even allowing the
user to enter an expected ttyUSB? Will have a think.

As an aside, looking at the serial numbers, I noticed that in Linux the S/N
is two characters longer than that reported with AT commands? After
researching this the AT command one is correct and the Linux one is not,
anybody noticed that before?
E.G.: AT: LQ714304880310 Linux: LQ71430488031020

--
Paul



On Thu, 25 Jan 2018 at 21:00, Aleksander Morgado <aleksander at aleksander.es>
wrote:

>
>
> On Thu, Jan 25, 2018 at 9:19 PM, Dan Williams <dcbw at redhat.com> wrote:
>
>> On Thu, 2018-01-25 at 18:26 +0000, Paul Gildea wrote:
>> > Yep, was fairly clear from your patch, nice! I guess that depends on
>> > prevalence of congruent S/N's (at least for modems where that will be
>> > needed, unlike your EM7565 which upgrades in SuperSpeed).
>> > My ports seem predictable for manual setting, and if not at least the
>> > user
>> > can solve it with trial/error to get around the problem.
>>
>> I'd be hesitant to use the serial number; this is often the same for
>> different devices of the same model.  So if you have two of the same
>> modem on your system, it could become confused.
>>
>>
> We could always halt the automatic upgrade process if we find some other
> modem with the same s/n around. Or worst case, we could even make
> qmi-firmware-update processes synchronize so that they are never run at the
> same time for the same s/n. Just thinking out loud here...
>
> --
> Aleksander
> https://aleksander.es
>
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