[PATCH] broadband-modem-mbim: disable CDMA capabilities until we actually support MBIM+CDMA

Ward, David - 0665 - MITLL david.ward at ll.mit.edu
Sat Aug 29 23:21:45 PDT 2015

On 08/20/2015 12:43 PM, Dan Williams wrote:
> CDMA-capable modems (like a Sierra EM7355) will fail to even enable,
> because the internal CDMA code tries to initialize using AT commands and
> that fails because many MBIM modems don't have an AT port.  We should
> figure out how to support minimal MBIM + CDMA using MBIM instead of
> AT-anything.

Not only does this fix allow me to use MBIM on a Dell Wireless 5808e 
(branded Sierra Wireless EM7355)...

I now seem to be able to use MBIM directly from a cold boot, without 
ever switching to the QMI configuration. And for that matter, the QMI 
configuration no longer seems to require the FCC Auth command; the modem 
goes directly to an online state even if ModemManager is disabled at 
startup. I have disconnected the laptop from both AC and battery for 10 
minutes and then this still works. I'm quite confident this was not 
possible three weeks ago.

Was this a Verizon over-the-air firmware update perhaps? Is anyone else 
with this modem noticing this too?

# qmicli -p -d /dev/cdc-wdm0 --dms-get-revision
[/dev/cdc-wdm0] Device revision retrieved:
     Revision: 'SWI9X15C_05.05.16.03 r22385 carmd-fwbuild1 2014/06/04 

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