[OpenWrt-Devel] ramips/mt7621 after 5.4 switch
bjorn at mork.no
Tue Apr 7 10:33:56 EDT 2020
Andre Valentin <avalentin at marcant.net> writes:
> 3) Problems with QMI Interfaces
> QMI is used for mobile phones and interact with the qmi_wwan driver in the kernel. I had transmit issues,
> switched the driver back to the 4.14 while still on 5.4. But the same problem happens again.
> Under 4.14 this was not a problem. So it seems 5.4 or the SOC patches somehow are the root cause.
> Here's the kernel message:
> [ 4199.444191] ------------[ cut here ]------------
> [ 4199.453534] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:447 dev_watchdog+0x2f8/0x300
> [ 4199.470074] NETDEV WATCHDOG: wwan0 (qmi_wwan): transmit queue 0 timed out
And this is not just an occasional timeout? The driver hangs completely
I don't think there were many qmi_wwan changes between v4.14 and v5.4,
except for device additions and some fixes which mostly have been
backported to v4.14-stable. But maybe this is related to your specific
modem? Do you have a device ID for that?
Do we know that USB is working on v5.4 BTW? The MT7621 device I am
using doesn't have any USB ports, so I can't check that myself.
Is your modem connected by USB3 or USB2? Any of
grep . /sys/bus/usb/devices/*/version
will tell. You'll have to match up the latter with the device if you
have more than one USB device connected.
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