Hi Aleksander, On Mon, 2021-11-08 at 16:11 +0100, Aleksander Morgado wrote: > Hey Thomas, > > Reviving an old email :) > > > On our setup, using i.MX6DL based board and a PCIe Sierra Wireless > > EM9190 module, running Yocto and Linux 5.13, we don't have much > > success > > for the moment, qmi and mbim commands very often end in timeout. > > > > Otherwise, when responses are received, we also can observe strange > > things: unexpected messages, response to previous commands or queue > > buffer issue. > > > > Once all my boot reliability issues seem solved, I've also started to > notice what you mean here. If I run a normal ModemManager build with > both QMI and MBIM enabled, MM will try to probe both the QMI and MBIM > ports. When that happens, I have no idea why, the modem gets in some > weird state with commands timing out and what not. Maybe it's because > we're using both ports at the same time, maybe it's because we run > QMI > on both the QMI and MBIM ports, no idea, the only thing I know is > that > if you choose to use either one or the other, the whole setup is > fully > stable. > > E.g. I'm right now testing my build after compiling ModemManager > using > --without-mbim (so QMI only), and I have absolutely no error. That's very good news! > Another > option if you don't want to rebuild MM is to flag the MBIM or the QMI > port as ID_MM_PORT_IGNORE with udev rules, which is very likely what > I'll end up doing in upstream ModemManager to have a proper default. > > I was thinking in preparing and sending for review the EM91xx entry > for drivers/bus/mhi/pci_generic.c, but it's mostly based on what you > suggested in the Sierra Wireless forum, so not sure if you'd like to > send it yourself here? I can send it myself here, and I add you as developer if you'd like ? Best regards, Thomas > The only changes I did w.r.t. what you > suggested are setting sideband_wake to false, and listing the > PCI_DEVICE_SUB() before the more generic PCI_DEVICE() one. > -- Thomas Perrot, Bootlin Embedded Linux and kernel engineering https://bootlin.com
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