diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index aff65cefead2..90c71979ba5e 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -351,38 +351,8 @@ static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)
 				NULL);
 	ACPI_FREE(obj);
 }
-
-static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev)
-{
-	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
-	struct xhci_hub *rhub = &xhci->usb3_rhub;
-	int ret;
-	int i;
-
-	/* This is not the usb3 roothub we are looking for */
-	if (hcd != rhub->hcd)
-		return;
-
-	if (hdev->maxchild > rhub->num_ports) {
-		dev_err(&hdev->dev, "USB3 roothub port number mismatch\n");
-		return;
-	}
-
-	for (i = 0; i < hdev->maxchild; i++) {
-		ret = usb_acpi_port_lpm_incapable(hdev, i);
-
-		dev_dbg(&hdev->dev, "port-%d disable U1/U2 _DSM: %d\n", i + 1, ret);
-
-		if (ret >= 0) {
-			rhub->ports[i]->lpm_incapable = ret;
-			continue;
-		}
-	}
-}
-
 #else
 static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }
-static void xhci_find_lpm_incapable_ports(struct usb_hcd *hcd, struct usb_device *hdev) { }
 #endif /* CONFIG_ACPI */
 
 /* called during probe() after chip reset completes */
@@ -418,10 +388,6 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
 static int xhci_pci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
 				      struct usb_tt *tt, gfp_t mem_flags)
 {
-	/* Check if acpi claims some USB3 roothub ports are lpm incapable */
-	if (!hdev->parent)
-		xhci_find_lpm_incapable_ports(hcd, hdev);
-
 	return xhci_update_hub_device(hcd, hdev, tt, mem_flags);
 }