diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index edffd81..11482b6 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -78,6 +78,8 @@
 			xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
 					" endpoint cmd after reset endpoint\n");
 	}
+	if (pdev->vendor == PCI_VENDOR_ID_NEC)
+		xhci->quirks |= XHCI_NEC_HOST;
 
 	/* Make sure the HC is halted. */
 	retval = xhci_halt(xhci);
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 36c858e..9012098 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1071,6 +1071,15 @@
 			xhci_warn(xhci, "Reset device command completion "
 					"for disabled slot %u\n", slot_id);
 		break;
+	case TRB_TYPE(TRB_NEC_GET_FW):
+		if (!(xhci->quirks & XHCI_NEC_HOST)) {
+			xhci->error_bitmask |= 1 << 6;
+			break;
+		}
+		xhci_dbg(xhci, "NEC firmware version %2x.%02x\n",
+				NEC_FW_MAJOR(event->status),
+				NEC_FW_MINOR(event->status));
+		break;
 	default:
 		/* Skip over unknown commands on the event ring */
 		xhci->error_bitmask |= 1 << 6;
@@ -1079,6 +1088,17 @@
 	inc_deq(xhci, xhci->cmd_ring, false);
 }
 
+static void handle_vendor_event(struct xhci_hcd *xhci,
+		union xhci_trb *event)
+{
+	u32 trb_type;
+
+	trb_type = TRB_FIELD_TO_TYPE(event->generic.field[3]);
+	xhci_dbg(xhci, "Vendor specific event TRB type = %u\n", trb_type);
+	if (trb_type == TRB_NEC_CMD_COMP && (xhci->quirks & XHCI_NEC_HOST))
+		handle_cmd_completion(xhci, &event->event_cmd);
+}
+
 static void handle_port_status(struct xhci_hcd *xhci,
 		union xhci_trb *event)
 {
@@ -1659,7 +1679,10 @@
 			update_ptrs = 0;
 		break;
 	default:
-		xhci->error_bitmask |= 1 << 3;
+		if ((event->event_cmd.flags & TRB_TYPE_BITMASK) >= TRB_TYPE(48))
+			handle_vendor_event(xhci, event);
+		else
+			xhci->error_bitmask |= 1 << 3;
 	}
 	/* Any of the above functions may drop and re-acquire the lock, so check
 	 * to make sure a watchdog timer didn't mark the host as non-responsive.
@@ -2378,6 +2401,12 @@
 			false);
 }
 
+int xhci_queue_vendor_command(struct xhci_hcd *xhci,
+		u32 field1, u32 field2, u32 field3, u32 field4)
+{
+	return queue_command(xhci, field1, field2, field3, field4, false);
+}
+
 /* Queue a reset device command TRB */
 int xhci_queue_reset_device(struct xhci_hcd *xhci, u32 slot_id)
 {
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 8a49c67..27345cd 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -486,6 +486,9 @@
 
 	if (NUM_TEST_NOOPS > 0)
 		doorbell = xhci_setup_one_noop(xhci);
+	if (xhci->quirks & XHCI_NEC_HOST)
+		xhci_queue_vendor_command(xhci, 0, 0, 0,
+				TRB_TYPE(TRB_NEC_GET_FW));
 
 	if (xhci_start(xhci)) {
 		xhci_halt(xhci);
@@ -495,6 +498,8 @@
 	xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
 	if (doorbell)
 		(*doorbell)(xhci);
+	if (xhci->quirks & XHCI_NEC_HOST)
+		xhci_ring_cmd_db(xhci);
 
 	xhci_dbg(xhci, "Finished xhci_run\n");
 	return 0;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index dada2fb..8b4b7d3 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -925,6 +925,7 @@
 /* TRB bit mask */
 #define	TRB_TYPE_BITMASK	(0xfc00)
 #define TRB_TYPE(p)		((p) << 10)
+#define TRB_FIELD_TO_TYPE(p)	(((p) & TRB_TYPE_BITMASK) >> 10)
 /* TRB type IDs */
 /* bulk, interrupt, isoc scatter/gather, and control data stage */
 #define TRB_NORMAL		1
@@ -992,6 +993,14 @@
 #define TRB_MFINDEX_WRAP	39
 /* TRB IDs 40-47 reserved, 48-63 is vendor-defined */
 
+/* Nec vendor-specific command completion event. */
+#define	TRB_NEC_CMD_COMP	48
+/* Get NEC firmware revision. */
+#define	TRB_NEC_GET_FW		49
+
+#define NEC_FW_MINOR(p)		(((p) >> 0) & 0xff)
+#define NEC_FW_MAJOR(p)		(((p) >> 8) & 0xff)
+
 /*
  * TRBS_PER_SEGMENT must be a multiple of 4,
  * since the command ring is 64-byte aligned.
@@ -1172,6 +1181,7 @@
 	unsigned int		quirks;
 #define	XHCI_LINK_TRB_QUIRK	(1 << 0)
 #define XHCI_RESET_EP_QUIRK	(1 << 1)
+#define XHCI_NEC_HOST		(1 << 2)
 };
 
 /* For testing purposes */
@@ -1379,6 +1389,8 @@
 int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id);
 int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
 		u32 slot_id);
+int xhci_queue_vendor_command(struct xhci_hcd *xhci,
+		u32 field1, u32 field2, u32 field3, u32 field4);
 int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
 		unsigned int ep_index);
 int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,