Hello Loic, On Tue, 2021-09-07 at 11:37 +0200, Loic Poulain wrote: > HI Thomas, > > On Tue, 7 Sept 2021 at 10:20, Thomas Perrot < > thomas.per...@bootlin.com> wrote: > > > > Hello, > > > > I still have some issues driving the Sierra Wireless AirPrime > > EM919X > > with ModemManager. > > > > Now, the modem is detected, but it is stuck in "unavailable" status > > and > > ModemManager fails to communicate with it through QMI, do you have > > any > > idea of what I should check? > > > > Moreover, I tried to increase the timeout value, I have also tried > > to > > disable MBIM, because EM919X exposes a QMI and a MBIM interface, > > then > > when the MBIM interface is available MM try to use QMI over MBIM, > > after > > failure with QMI and, in this case, the message "mhi_wwan_ctrl > > mhi0_QMI: Failed to queue buffer" is raised. > > Which kernel tag/commit are you building from? would you be able to > try on mainline.
Currently, we used the kernel v5.13.6 (6fdb13a7e573640853c481ddabf7a192fff42bba). > > I don't know much about this modem, but some vendors support the MBIM > way, the QMI way, or both. The modem has the generic SDX55 PCI ids > and > is then exposing both, maybe this is not the right thing for this > modem. I would suggest checking if this modem has subvendor-ids, and > add a specific mhi_controller_config structure for it in > mhi/pci_generic, you can try the 'MBIM way' similarly to what has > been > done for modem_foxconn_sdx55_config. > Thanks I will look at this point. > Regards, > Loic > > > > > mhi_controller_config -- Thomas Perrot, Bootlin Embedded Linux and kernel engineering https://bootlin.com
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