USB: Add SuperSpeed to the list of USB device speeds.

Modify the USB core to handle the new USB 3.0 speed, "SuperSpeed".  This
is 5.0 Gbps (wire speed).  There are probably more places that check for
speed that I've missed.

SuperSpeed devices have a 512 byte endpoint 0 max packet size.  This shows
up as a bMaxPacketSize0 set to 0x09 (see table 9-8 of the USB 3.0 bus
spec).

xHCI spec says that the xHC can handle intervals up to 2^15 microframes.  That
might change when real silicon becomes available.

Add FIXME note for SuperSpeed isochronous endpoints.  They can transmit up
to 16 packets in one "burst" before they wait for an acknowledgment of the
packets.  They can do up to 3 bursts per microframe (determined by the
mult value in the endpoint companion descriptor).  The xHCI driver doesn't
have support for isoc yet, so fix this later.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c7a1a1d4bcb1..fa0208e0da6a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2471,6 +2471,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
          * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
          */
         switch (udev->speed) {
+        case USB_SPEED_SUPER:
         case USB_SPEED_VARIABLE:        /* fixed at 512 */
                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
                 break;
@@ -2496,6 +2497,9 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
         case USB_SPEED_LOW:     speed = "low";  break;
         case USB_SPEED_FULL:    speed = "full"; break;
         case USB_SPEED_HIGH:    speed = "high"; break;
+        case USB_SPEED_SUPER:
+                                speed = "super";
+                                break;
         case USB_SPEED_VARIABLE:
                                 speed = "variable";
                                 type = "Wireless ";
@@ -2634,8 +2638,11 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
         if (retval)
                 goto fail;
 
-        i = udev->descriptor.bMaxPacketSize0 == 0xff?   /* wusb device? */
-            512 : udev->descriptor.bMaxPacketSize0;
+        if (udev->descriptor.bMaxPacketSize0 == 0xff ||
+                        udev->speed == USB_SPEED_SUPER)
+                i = 512;
+        else
+                i = udev->descriptor.bMaxPacketSize0;
         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
                 if (udev->speed != USB_SPEED_FULL ||
                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {