Johan Hovold <johan@xxxxxxxxxx> wrote: > On Sun, Dec 21, 2014 at 11:25:45PM +0100, Reinhard Speyerer wrote: > > > When using a MC7304 with firmware revision SWI9X15C_05.05.16.02 on > > Knoppix 7.4.2 with Linux kernel 3.16.3 and the qcserial driver I noticed > > that AT unsolicited response codes (URCs) like +CREG were missing (the mobile > > has been set to AT+CREG=2 before and <LACx>/<CIx> is used instead of the real > > LACs/CIs): > > > Switching the mobile back to the option driver > > > caused the missing +CREG: to reappear: > > > The URCs are also present when using the vendor GobiSerial driver. > > Do you have a link to that driver? The one I found does not seem to send > the control requests you mention below. The vendor driver (USB drivers Linux QMI Software S2.20N2.27) is available from <http://developer.sierrawireless.com/Resources/Resources/AirPrime/Software/USB%20drivers%20Linux%20QMI%20Software.aspx> (registration required for downloading the driver). > > Besides +CREG: other URCs like e.g. +CUSD: or +CMT: are also affected. > > MC7710 devices with VID/PID 0x1199/0x68a2 which I cross-checked for > > comparison do not show this problem. > > The URCs are there also with qcserial? Correct. With a MC7710 with firmware revision SWI9200X_03.05.24.00 the URCs are also there with qcserial. > > From comparing option.c and qcserial.c the only difference in > > initialization visible to me is the option_send_setup code. The > > proposed patch below for kernel 3.19 or later moves Sierra Wireless > > VID/PID 0x1199/0x68c0 devices from the qcserial to the option driver > > using an appropriate blacklist for the QMI/network interfaces (8..11) > > and the USB audio interfaces (16..18) present in some firmwares. > > > > An alternative to this patch would be to add the option_send_setup code > > to qcserial.c for Sierra Wireless VID/PID 0x1199/0x68c0 devices. > > I leaning towards adding modem-control support to qcserial (send_setup). > > Can you confirm that the vendor driver is sending these control > requests? Sorry, I could not verify that. > > And did you already verify that adding them to qcserial fixes the issue > with MC7304? > To verify that the URCs do not appear as a side effect of other option initialization code I will try to port the send_setup code to qcserial and report on the results. Regards, Reinhard -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
