> -----Original Message----- > From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb- > owner@xxxxxxxxxxxxxxx] On Behalf Of Tuan Nguyen > Sent: Friday, June 10, 2011 7:07 AM > To: linux-usb@xxxxxxxxxxxxxxx > Subject: Kernel 2.6.34 & 2.6.39: USB 3.0 port frozen after several > power cycles > > Hi forks, > > I am testing a Western Digital My Book 3.0 drive via USB 3.0 interface. > After a > several power cycles (turn on/off) the drive - and many read/write > commands in > between, the USB 3.0 port on which the drive is attached to stopped > responding > when the drive is powered on/off. If I take out the drive's USB cable > and plug > it to the other USB 3.0 port, the system recognizes it immediately. If > I plug > the cable to the frozen port half way, the system recognize the drive > as a > high-speed (USB 2.0) drive. > > I put some printks to the USB code to trace down the problem, I led me > to the > call to hub_port_connect_change() function in hub_events() function. In > the port > frozen case, the USB_PORT_STAT_CONNECTION bit (bit 0) of portstatus > parameter is > always 0. Therefore, in hub_port_connect_change() function, it returns > when > checking that bit for not 1 so the code to initialize the port is never > get hit. > > Now I am stuck right there. I don't know how to get the port back to > normal > state from frozen. Is there anyway to reset the port in that case? Any > possible > reason that caused the problem and how do I prevent it? > If the port link is in SS.Inactive state, a warm reset probably helps. As I know, Kingston USB3.0 flash hot plug reports with USB_PORT_STAT_CONNECTION not set. Warm reset the port will transition it to U0 and CCS is set. What's the portstatus when the issue occurs? Test it on 3.0.0-rc since it has refined the USB3 port status report. > I use a ASUS U3S6 USB 3.0 2 ports card, NEC chip with 30.27 firmware > version. I > got that problem with 2.6.34 kernel. I moved to2.6.39 kernel but the > problem is > still there. > > Any help on this would be highly appreciated. > Please try the latest 3.0.0-rc to see if it helps. Thanks, Andiry -- 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
