On Thu, 13 Dec 2012, Timur wrote: > On 12/12/2012 07:34 PM, Alan Stern wrote: > > > Okay. Then how about this: Unplug both the power connector and the > > slave connector. After the N7 goes into deep sleep, plug the power > > connector back in but leave the slave unplugged. Then a few seconds > > later, plug in the slave. > > This always fails (-71 / SET_ADDRESS). The issues can then only be > solved, by unplugging the "OTG" adapter. In other words, by switching to > peripheral mode (and back). > > > Also try doing the same thing, but don't wait for the N7 to go into > > deep sleep. If this works but the other test doesn't, then clearly the > > slave is working correctly and the problem lies in the host controller. > > This works well most of the time. Some issues in a few cases, not sure > why. (It is possible to debug over WiFi. But doing so would prevent LP0.) So it seems clear that the problem is the deep sleep implementation in ehci-tegra. That implementation is very non-standard in the 3.7 kernel. To fix it will require assistance from the people responsible for the ehci-tegra driver. I can be of only limited help because I don't have any Tegra hardware and I don't know how it's supposed to work. 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
