Index: ehci_pci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/ehci_pci.c,v
retrieving revision 1.64
diff -u -p -r1.64 ehci_pci.c
--- ehci_pci.c	13 Oct 2016 20:05:06 -0000	1.64
+++ ehci_pci.c	9 Jun 2017 15:45:29 -0000
@@ -161,10 +161,14 @@ ehci_pci_attach(device_t parent, device_
 		break;
 	}
 
+	intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG);
+	pin = PCI_INTERRUPT_PIN(intr);
+
 	/* Enable the device. */
 	csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
-	pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG,
-		       csr | PCI_COMMAND_MASTER_ENABLE);
+	csr |= PCI_COMMAND_MASTER_ENABLE;
+	csr &= ~(pin ? PCI_COMMAND_INTERRUPT_DISABLE : 0)
+	pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr);
 
 	/* Map and establish the interrupt. */
 	if (pci_intr_map(pa, &ih)) {