DM USB: xHCI: fix enumeration error after rebooting

When the physical USB device is disconnected before DM's emulation
is ready, the virtual connection state is not cleared properly. This
will cause the DM refuse to do emulation for future physical connection.

This patch clears those states mentioned above and hence fix the issue.

Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Reviewed-by: Liang Yang <liang3.yang@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
Tracked-On: #1367

devicemodel/hw/pci/xhci.c

@@ -631,7 +631,7 @@ pci_xhci_native_usb_dev_disconn_cb(void *hci_data, void *dev_data)
 	struct usb_native_devinfo di;
 	struct usb_dev *udev;
 	uint8_t port, slot;
-	uint8_t status;
+	uint16_t status;
 	int need_intr = 1;
 
 	assert(hci_data);
@@ -646,8 +646,8 @@ pci_xhci_native_usb_dev_disconn_cb(void *hci_data, void *dev_data)
 		return -1;
 	}
 
-	status = VPORT_STATE(xdev->port_map_tbl[di.bus][di.port]);
-	if (status == VPORT_HUB_CONNECTED) {
+	status = xdev->port_map_tbl[di.bus][di.port];
+	if (VPORT_STATE(status) == VPORT_HUB_CONNECTED) {
 		xdev->port_map_tbl[di.bus][di.port] =
 			VPORT_NUM_STATE(VPORT_ASSIGNED, 0);
 		return 0;
@@ -679,7 +679,23 @@ pci_xhci_native_usb_dev_disconn_cb(void *hci_data, void *dev_data)
 		}
 	}
 
-	if (port == XHCI_MAX_DEVS + 1) {
+	if (port > XHCI_MAX_DEVS) {
+		if (VPORT_STATE(status) == VPORT_CONNECTED &&
+				VPORT_NUM(status) > 0) {
+			/*
+			 * When this place is reached, it means the physical
+			 * USB device is disconnected before the emulation
+			 * procedure is started. The related states should be
+			 * cleared for future connecting.
+			 */
+			UPRINTF(LFTL, "disconnect VPORT_CONNECTED device: "
+					"%d-%d vport %d\r\n", di.bus, di.port,
+					VPORT_NUM(status));
+			pci_xhci_disconnect_port(xdev, VPORT_NUM(status), 0);
+			xdev->port_map_tbl[di.bus][di.port] = VPORT_NUM_STATE(
+					VPORT_ASSIGNED, 0);
+		}
+
 		UPRINTF(LFTL, "fail to find physical port %d\r\n", di.port);
 		return -1;
 	}