xhci: set slot context speed field to SuperSpeedPlus for USB 3.1 SSP devices

BugLink: http://bugs.launchpad.net/bugs/1519623

The speed field of the input slot context should represent the speed the
device is working at.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit d7854041)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/usb/host/xhci-mem.c

@@ -1108,6 +1108,9 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud
 	slot_ctx->dev_info |= cpu_to_le32(LAST_CTX(1) | udev->route);
 	switch (udev->speed) {
 	case USB_SPEED_SUPER_PLUS:
+		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SSP);
+		max_packets = MAX_PACKET(512);
+		break;
 	case USB_SPEED_SUPER:
 		slot_ctx->dev_info |= cpu_to_le32(SLOT_SPEED_SS);
 		max_packets = MAX_PACKET(512);

drivers/usb/host/xhci.h

@@ -343,6 +343,7 @@ struct xhci_op_regs {
 #define	SLOT_SPEED_LS		(XDEV_LS << 10)
 #define	SLOT_SPEED_HS		(XDEV_HS << 10)
 #define	SLOT_SPEED_SS		(XDEV_SS << 10)
+#define	SLOT_SPEED_SSP		(XDEV_SSP << 10)
 /* Port Indicator Control */
 #define PORT_LED_OFF	(0 << 14)
 #define PORT_LED_AMBER	(1 << 14)