USB: Add parsing of SuperSpeed endpoint companion descriptor.

Allow the xHCI drivers (and any new USB 3.0 drivers) to parse the
SuperSpeed endpoint companion descriptor to find the maximum number of
bulk endpoint streams the endpoint supports.  This is used to calculate
the maximum total number of streams the driver can allocate.

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

diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index e58369ff8168b7a81058efa3b060a807284ff73f..603b61aadd6548a12629f205c3278a96751b398d 100644 (file)
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -556,6 +556,8 @@ struct usb_ss_ep_comp_descriptor {
 } __attribute__ ((packed));
 
 #define USB_DT_SS_EP_COMP_SIZE         6
+/* Bits 4:0 of bmAttributes if this is a bulk endpoint */
+#define USB_SS_MAX_STREAMS(p)          (1 << (p & 0x1f))
 
 /*-------------------------------------------------------------------------*/