usb: xhci: Don't assume LS/FS devices are always behind a HS hub

At present xHCI driver assumes LS/FS devices are attached directly
to a HS hub. If they are connected to a LS/FS hub, the driver will
fail to perform the USB enumeration process on such devices.

This is fixed by looking from the device itself all the way up to
the HS hub where the TT that serves the device is located.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

drivers/usb/host/xhci-mem.c

@@ -786,12 +786,22 @@ void xhci_setup_addressable_virt_dev(struct xhci_ctrl *ctrl,
 #ifdef CONFIG_DM_USB
 	/* Set up TT fields to support FS/LS devices */
 	if (speed == USB_SPEED_LOW || speed == USB_SPEED_FULL) {
-		dev = dev_get_parent_priv(udev->dev);
-		if (dev->speed == USB_SPEED_HIGH) {
-			hub = dev_get_uclass_priv(udev->dev);
+		struct udevice *parent = udev->dev;
+
+		dev = udev;
+		do {
+			port_num = dev->portnr;
+			dev = dev_get_parent_priv(parent);
+			if (usb_hub_is_root_hub(dev->dev))
+				break;
+			parent = dev->dev->parent;
+		} while (dev->speed != USB_SPEED_HIGH);
+
+		if (!usb_hub_is_root_hub(dev->dev)) {
+			hub = dev_get_uclass_priv(dev->dev);
 			if (hub->tt.multi)
 				slot_ctx->dev_info |= cpu_to_le32(DEV_MTT);
-			slot_ctx->tt_info |= cpu_to_le32(TT_PORT(udev->portnr));
+			slot_ctx->tt_info |= cpu_to_le32(TT_PORT(port_num));
 			slot_ctx->tt_info |= cpu_to_le32(TT_SLOT(dev->slot_id));
 		}
 	}