On Tue, 13 Aug 2013, Oleksij Rempel wrote: > If usb auto suspend is enabled or system run in to suspend/resume > cycle ath9k-htc adapter will stop to response. It is reproducible on xhci HCs. > > Host part of problem: > XHCI do timing calculation based on Transfer Type and bInterval, > immediately after device was detected. Ath9k-htc try to overwrite > this parameters on module probe and some changes in FW, > since we do not initiate usb reset from the driver this changes > are not took to account. So, before any kind of suspend or reset, > host controller will operate with old parameters. Only after suspend/resume > and if interface id stay unchanged, new parameters will by applied. Host > will send bulk data with no intervals (?), which will cause > overflow on FIFO of EP4. > > Firmware part of problem: > By default, ath9k-htc adapters configured with EP3 and EP4 > as interrupt endpoints. Current firmware will try to overwrite > ConfigDescriptor to make EP3 and EP4 bulk. FIFO for this endpoints > stay not reconfigured, so under the hood it is still Int EP. One little comment on the patch title. You aren't converting the endpoints back from bulk to interrupt; rather you are preventing the driver and firmware from trying to convert them from interrupt to bulk. Alan Stern -- 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
