usb: define HCD_USB31 speed option for hosts that support USB 3.1 features

Hosts that support USB 3.1 Enhaned SuperSpeed can set their speed to
HCD_USB31 to let usb core and host drivers know that the controller
supports new USB 3.1 features.

make sure usb core handle HCD_USB31 hosts correctly, for now similar
to HCD_USB3.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hcd.c

@@ -555,6 +555,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 		switch (wValue & 0xff00) {
 		case USB_DT_DEVICE << 8:
 			switch (hcd->speed) {
+			case HCD_USB31:
 			case HCD_USB3:
 				bufp = usb3_rh_dev_descriptor;
 				break;
@@ -576,6 +577,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 			break;
 		case USB_DT_CONFIG << 8:
 			switch (hcd->speed) {
+			case HCD_USB31:
 			case HCD_USB3:
 				bufp = ss_rh_config_descriptor;
 				len = sizeof ss_rh_config_descriptor;
@@ -2775,6 +2777,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 		rhdev->speed = USB_SPEED_WIRELESS;
 		break;
 	case HCD_USB3:
+	case HCD_USB31:
 		rhdev->speed = USB_SPEED_SUPER;
 		break;
 	default:

include/linux/usb/hcd.h

@@ -250,6 +250,7 @@ struct hc_driver {
 #define	HCD_USB2	0x0020		/* USB 2.0 */
 #define	HCD_USB25	0x0030		/* Wireless USB 1.0 (USB 2.5)*/
 #define	HCD_USB3	0x0040		/* USB 3.0 */
+#define	HCD_USB31	0x0050		/* USB 3.1 */
 #define	HCD_MASK	0x0070
 #define	HCD_BH		0x0100		/* URB complete in BH context */