1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dfa44d3e8eee..3f912705dcef 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4778,8 +4778,16 @@ int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
         ctrl_ctx->add_flags |= cpu_to_le32(SLOT_FLAG);
         slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
         slot_ctx->dev_info |= cpu_to_le32(DEV_HUB);
+        /*
+         * refer to section 6.2.2: MTT should be 0 for full speed hub,
+         * but it may be already set to 1 when setup an xHCI virtual
+         * device, so clear it anyway.
+         */
         if (tt->multi)
                 slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
+        else if (hdev->speed == USB_SPEED_FULL)
+                slot_ctx->dev_info &= cpu_to_le32(~DEV_MTT);
+
         if (xhci->hci_version > 0x95) {
                 xhci_dbg(xhci, "xHCI version %x needs hub "
                                 "TT think time and number of ports\n",