usb: core: urb: Check SSP isoc ep comp descriptor

The maximum bytes per interval for USB SuperSpeed Plus can be set by
isoc endpoint companion descriptor when it is above 48K. If the
descriptor is provided, then use its value.

USB 3.1 spec 9.6.8

Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 796c9b149728ba7728c8037d05de0f74f6f41394..f51750bcd1528ba5aa3c8996b9dd0bc320ce8beb 100644 (file)
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -433,6 +433,14 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
                        max *= mult;
                }
 
+               if (dev->speed == USB_SPEED_SUPER_PLUS &&
+                   USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) {
+                       struct usb_ssp_isoc_ep_comp_descriptor *isoc_ep_comp;
+
+                       isoc_ep_comp = &ep->ssp_isoc_ep_comp;
+                       max = le32_to_cpu(isoc_ep_comp->dwBytesPerInterval);
+               }
+
                /* "high bandwidth" mode, 1-3 packets/uframe? */
                if (dev->speed == USB_SPEED_HIGH)
                        max *= usb_endpoint_maxp_mult(&ep->desc);