"DeviceNotReady" when enabling modem on Qualcomm SM7225

[Luca Weiss]

Hi, I'm trying to get modemmanager to work on Fairphone 4 mainline (SoC is 
Snapdragon 750G, sm7225)

(sidenote, sm6350 is very similar to sm7225 apart from clock speeds and some 
minor hardware differences)

The modem remoteproc comes up fine, and (as it's a dual SIM device) after I 
select the correct "application" in the privisioning session (see https://
wiki.postmarketos.org/wiki/User:TravMurav/Dual-Sim_QMI_draft) the mmcli output 
looks okay to me.

$ mmcli -m 0                                                                                                                                                                                                                                                                                                 
  -----------------------------                                                                                                                                                                                                                                                                                             
  General  |              path: /org/freedesktop/ModemManager1/Modem/0                                                                                        
           |         device id: 46e6d18484ff43e780268699ddc1ca2555ed07cc
  -----------------------------      
  Hardware |      manufacturer: QUALCOMM INCORPORATED
           |             model: 0
           | firmware revision: MPSS.HI.2.0.1.c6-00447-BITRA_GEN_PACK-1  1  
[Jun 08 2021 18:00:00]
           |    carrier config: default  
           |      h/w revision: 10000   
           |      equipment id: 355870090002350
  -----------------------------                              
  System   |            device: qcom-soc
           |           drivers: ipa, qrtr
           |            plugin: qcom-soc                                                                                                                      
           |      primary port: qrtr0   
           |             ports: qrtr0 (qmi), rmnet_ipa0 (net)
  -----------------------------            
  Status   |              lock: sim-pin2
           |    unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-
puk2 (10)
           |             state: disabled                     
           |       power state: off
           |    signal quality: 0% (cached)       
  -----------------------------
  Modes    |         supported: allowed: any; preferred: none       
           |           current: allowed: any; preferred: none               
  -----------------------------                      
  IP       |         supported: ipv4, ipv6, ipv4v6
  -----------------------------                                                                                                                                                                                                                                                                                             
  SIM      |  primary sim path: /org/freedesktop/ModemManager1/SIM/1
           |    sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0
           |                    slot 2: none (active)                                                                                                                                                                                                                                                                       


As far as I know then I am supposed to enable the modem using "mmcli -m 0 -e" 
but running this gives the following error:

error: couldn't enable the modem: 
'GDBus.Error:org.freedesktop.libqmi.Error.Protocol.DeviceNotReady: Couldn't 
set operating mode: QMI protocol error (52): 'DeviceNotReady''

As far as I understand this is the modem firmware returning this error code (I 
assume modem logs would tell what's going on but I'm not aware of a way to 
retrieve them - on mainline at least).

I also uploaded the log of "/usr/sbin/ModemManager --debug --log-level=DEBUG 
--log-file=modemmanager.log --log-timestamps" here: 
https://pastebin.com/raw/ebTvgxzD

Anyone have an idea what's going on here and what might be missing in my 
setup?

Regards
Luca

Original GitLab issue:
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/484