Unwedge failed device on failed attempt.

Usb.cpp

@@ -581,6 +581,18 @@ uint8_t USB::AttemptConfig(uint8_t driver, uint8_t parent, uint8_t port, bool lo
                 }
         }
         rcode = devConfig[driver]->Init(parent, port, lowspeed);
+        if(rcode) {
+                // Issue a bus reset, because the device may be in a limbo state
+                if (parent == 0) {
+                        // Send a bus reset on the root interface.
+                        regWr(rHCTL, bmBUSRST); //issue bus reset
+                        delay(102); // delay 102ms, compensate for clock inaccuracy.
+                } else {
+                        // reset parent port
+                        devConfig[parent]->ResetHubPort(port);
+                }
+
+        }
         return rcode;
 }