Quectel and Telit issues

[Enrico Mioso]

Hello Marc!

In my opinion, this is more of a musb-related issue than a Modemmanager related one.
Or, in other words, I guess the problem stands in the path between your embedded board and the modem itself (USB related things).
So, there is not much MM can do to help out. Do you have the possibility of trying a newer kernel?

Enrico

On Mon, 5 Jul 2021, Marc Murphy wrote:

> Date: Mon, 5 Jul 2021 15:03:08
> From: Marc Murphy <marcmltd at marcm.co.uk>
> To: "modemmanager-devel at lists.freedesktop.org"
>     <modemmanager-devel at lists.freedesktop.org>
> Subject: Quectel and Telit issues
> 
> Hello All
>
> Been looking at an issue on my embedded device.  Have previously been using SierraWireless MC7430 and Huawei module without issues.
> I have recently changed to try a Telit 910 and a Quectel EG21-G and get :
>
> [   47.020239] CPU: 0 PID: 427 Comm: ModemManager Not tainted 4.19.94
> [   47.020285] [<c0113e18>] (unwind_backtrace) from [<c010e388>] (show_stack+0x20/0x24)
> [   47.020309] [<c010e388>] (show_stack) from [<c0d20f5c>] (dump_stack+0x8c/0xa0)
> [   47.020328] [<c0d20f5c>] (dump_stack) from [<c013c928>] (__warn.part.3+0xcc/0xe8)
> [   47.020340] [<c013c928>] (__warn.part.3) from [<c013c9bc>] (warn_slowpath_fmt+0x78/0x94)
> [   47.020355] [<c013c9bc>] (warn_slowpath_fmt) from [<c0a24e0c>] (musb_h_tx_flush_fifo+0x148/0x14c)
> [   47.020370] [<c0a24e0c>] (musb_h_tx_flush_fifo) from [<c0a25dcc>] (musb_cleanup_urb+0x88/0xf0)
> [   47.020383] [<c0a25dcc>] (musb_cleanup_urb) from [<c0a25fe4>] (musb_urb_dequeue+0x1b0/0x1f0)
> [   47.020401] [<c0a25fe4>] (musb_urb_dequeue) from [<c09c3660>] (unlink1+0x3c/0x11c)
> [   47.020415] [<c09c3660>] (unlink1) from [<c09c5a54>] (usb_hcd_unlink_urb+0x80/0xd8)
> [   47.020429] [<c09c5a54>] (usb_hcd_unlink_urb) from [<c09c6fd8>] (usb_kill_urb.part.4+0x50/0xdc)
> [   47.020441] [<c09c6fd8>] (usb_kill_urb.part.4) from [<c09c709c>] (usb_kill_urb+0x38/0x3c)
> [   47.020477] [<c09c709c>] (usb_kill_urb) from [<bf1efd04>] (usb_wwan_close+0xcc/0xfc [usb_wwan])
> [   47.020577] [<bf1efd04>] (usb_wwan_close [usb_wwan]) from [<bf199030>] (serial_port_shutdown+0x30/0x34 [usbserial])
> [   47.020619] [<bf199030>] (serial_port_shutdown [usbserial]) from [<c07f7fbc>] (tty_port_shutdown+0xa0/0xa4)
> [   47.020634] [<c07f7fbc>] (tty_port_shutdown) from [<c07f8834>] (tty_port_close+0x4c/0x84)
> [   47.020662] [<c07f8834>] (tty_port_close) from [<bf199a0c>] (serial_close+0x34/0x5c [usbserial])
> [   47.020702] [<bf199a0c>] (serial_close [usbserial]) from [<c07ee548>] (tty_release+0x100/0x60c)
> [   47.020723] [<c07ee548>] (tty_release) from [<c031aa30>] (__fput+0x98/0x1e0)
> [   47.020737] [<c031aa30>] (__fput) from [<c031ac08>] (____fput+0x18/0x1c)
> [   47.020758] [<c031ac08>] (____fput) from [<c015e384>] (task_work_run+0xa4/0xc0)
> [   47.020773] [<c015e384>] (task_work_run) from [<c010ddb0>] (do_work_pending+0xfc/0x100)
> [   47.020785] [<c010ddb0>] (do_work_pending) from [<c010106c>] (slow_work_pending+0xc/0x20)
> [   47.020793] Exception stack(0xec821fb0 to 0xec821ff8)
> [   47.020803] 1fa0:                                     00000000 00000002 00000000 00000000
> [   47.020814] 1fc0: 0000000a 004d4298 0060fa88 00000006 0000ffff b6fee968 006348e0 00000000
> [   47.020824] 1fe0: 00000006 bef63a20 b6a1d461 b6a1f526 80010030 0000000a
> [   47.020832] ---[ end trace 18e5006eee0b2754 ]---
>
> It seems to happen when ModemManager is scanning the modems.  Could it be something to do with USB3 interface on the modem and timings ?  The embedded platform is only USB2.
> Any update/info appreciated.
>
> Thanks in advance
>
> Marc
>
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