1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index fd9e03afd91c..2eb658d26394 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -835,6 +835,27 @@ fail:
         return 0;
 }
 
+void xhci_copy_ep0_dequeue_into_input_ctx(struct xhci_hcd *xhci,
+                struct usb_device *udev)
+{
+        struct xhci_virt_device *virt_dev;
+        struct xhci_ep_ctx      *ep0_ctx;
+        struct xhci_ring        *ep_ring;
+
+        virt_dev = xhci->devs[udev->slot_id];
+        ep0_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, 0);
+        ep_ring = virt_dev->eps[0].ring;
+        /*
+         * FIXME we don't keep track of the dequeue pointer very well after a
+         * Set TR dequeue pointer, so we're setting the dequeue pointer of the
+         * host to our enqueue pointer.  This should only be called after a
+         * configured device has reset, so all control transfers should have
+         * been completed or cancelled before the reset.
+         */
+        ep0_ctx->deq = xhci_trb_virt_to_dma(ep_ring->enq_seg, ep_ring->enqueue);
+        ep0_ctx->deq |= ep_ring->cycle_state;
+}
+
 /* Setup an xHCI virtual device for a Set Address command */
 int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev)
 {
@@ -1002,7 +1023,7 @@ static inline unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
         return EP_INTERVAL(interval);
 }
 
-/* The "Mult" field in the endpoint context is only set for SuperSpeed devices.
+/* The "Mult" field in the endpoint context is only set for SuperSpeed isoc eps.
  * High speed endpoint descriptors can define "the number of additional
  * transaction opportunities per microframe", but that goes in the Max Burst
  * endpoint context field.
@@ -1010,7 +1031,8 @@ static inline unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
 static inline u32 xhci_get_endpoint_mult(struct usb_device *udev,
                 struct usb_host_endpoint *ep)
 {
-        if (udev->speed != USB_SPEED_SUPER)
+        if (udev->speed != USB_SPEED_SUPER ||
+                        !usb_endpoint_xfer_isoc(&ep->desc))
                 return 0;
         return ep->ss_ep_comp.bmAttributes;
 }