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

Ward, David - 0665 - MITLL david.ward at ll.mit.edu
Sun Aug 30 10:33:16 PDT 2015

On 08/30/2015 02:21 AM, David Ward wrote:
> 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 
> 15:01:26'

I left out one potentially relevant detail: a data plan was only 
activated on this modem this past week. But prior to that (when I was 
still using QMI with the FCC Auth command), the modem still connected to 
the network, and my browser just redirected me to a Verizon landing page 
for activating a data plan instead.

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