Hi Bjørn, On 12/04/16 14:13, Bjørn Mork wrote: > Andreas Fett <andreas.f...@secunet.com> writes: >> System (cold) boots with /sys/bus/usb/devices/1-2/bConfigurationValue of >> "2". >> >> echo 0 > /sys/bus/usb/devices/1-2/bConfigurationValue >> echo 3 > /sys/bus/usb/devices/1-2/bConfigurationValue > > Hmm, rereading this while trying to make a case out of it, I realize > that I missed the fact that you need to switch to configuration 0 > (i.e. unconfigured). For some reason I thought you had to switch to > configuration 1. But that doesn't work either, does it? No. It always starts with "2" and we have to go back to "0" and then to "3" to get MBIM working. Switching to "1" and then to "3" (with or without delay) does not work.
> Then I guess we have a problem, because AFAICS the kernel will have to > make some decision by default. We could in theory make the > configuration switching always go via the unconfigured state, but adding > some arbitrary delay between the states is out of the question. That's > better left for userspace then. That I understand, and I don't even like the arbitrary part in userspace. Is there no observable feedback whatsoever when the modem has completed the configuration switch? >> echo Y > /sys/class/net/wwan0/cdc_mcn/ndp_to_end > > A device quirk for this one is simpler though. Just one question to be > sure: It does not work without this? It doesn't. The probing works and even the connect and reporting of address info, but I can't use it for actual traffic. Andreas
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