Vamsi Samavedam <vskrishn@xxxxxxxxxxxxxx> writes: > On Thu, Dec 14, 2017 at 07:55:50PM +0100, Bjørn Mork wrote: >> It has been reported that the dummy byte we add to avoid >> ZLPs can be forwarded by the modem to the PGW/GGSN, and that >> some operators will drop the connection if this happens. >> >> In theory, QMI devices are based on CDC ECM and should as such >> both support ZLPs and silently ignore the dummy byte. The latter >> assumption failed. Let's test out the first. >> >> Signed-off-by: Bjørn Mork <bjorn@xxxxxxx> >> --- >> I am a bit worried about the effect of this change on all the >> devices I can't test myself. But trying it is the only way we >> can ever find out.... > > flag zlp is tested with pids: 9034,9048,904c,9075, 908E,9079, > 908A,909F and 90A4. In general, qualcomm usb firmware can > handle zlps. Thanks. That's very good to know. Bjørn -- 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
