xhci: xhci-ring: use port structures for port event handler

use port structures in the port event handler.
Getting the right hcd and hcd portnumber from the hardware port number
is a lot easier with port structures, and allows us to remove a lot
of the previous code, including the find_faked_portnum_from_hw_index()
function
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -1497,44 +1497,6 @@ static void handle_vendor_event(struct xhci_hcd *xhci,
 		handle_cmd_completion(xhci, &event->event_cmd);
 }
 
-/* @port_id: the one-based port ID from the hardware (indexed from array of all
- * port registers -- USB 3.0 and USB 2.0).
- *
- * Returns a zero-based port number, which is suitable for indexing into each of
- * the split roothubs' port arrays and bus state arrays.
- * Add one to it in order to call xhci_find_slot_id_by_port.
- */
-static unsigned int find_faked_portnum_from_hw_portnum(struct usb_hcd *hcd,
-		struct xhci_hcd *xhci, u32 port_id)
-{
-	unsigned int i;
-	unsigned int num_similar_speed_ports = 0;
-
-	/* port_id from the hardware is 1-based, but port_array[], usb3_ports[],
-	 * and usb2_ports are 0-based indexes.  Count the number of similar
-	 * speed ports, up to 1 port before this port.
-	 */
-	for (i = 0; i < (port_id - 1); i++) {
-		u8 port_speed = xhci->port_array[i];
-
-		/*
-		 * Skip ports that don't have known speeds, or have duplicate
-		 * Extended Capabilities port speed entries.
-		 */
-		if (port_speed == 0 || port_speed == DUPLICATE_ENTRY)
-			continue;
-
-		/*
-		 * USB 3.0 ports are always under a USB 3.0 hub.  USB 2.0 and
-		 * 1.1 ports are under the USB 2.0 hub.  If the port speed
-		 * matches the device speed, it's a similar speed port.
-		 */
-		if ((port_speed == 0x03) == (hcd->speed >= HCD_USB3))
-			num_similar_speed_ports++;
-	}
-	return num_similar_speed_ports;
-}
-
 static void handle_device_notification(struct xhci_hcd *xhci,
 		union xhci_trb *event)
 {
@@ -1564,10 +1526,10 @@ static void handle_port_status(struct xhci_hcd *xhci,
 	int max_ports;
 	int slot_id;
 	unsigned int faked_port_index;
-	u8 major_revision;
 	struct xhci_bus_state *bus_state;
 	__le32 __iomem **port_array;
 	bool bogus_port_status = false;
+	struct xhci_port *port;
 
 	/* Port status change events always have a successful completion code */
 	if (GET_COMP_CODE(le32_to_cpu(event->generic.field[2])) != COMP_SUCCESS)
@@ -1584,47 +1546,22 @@ static void handle_port_status(struct xhci_hcd *xhci,
 		return;
 	}
 
-	/* Figure out which usb_hcd this port is attached to:
-	 * is it a USB 3.0 port or a USB 2.0/1.1 port?
-	 */
-	major_revision = xhci->port_array[port_id - 1];
-
-	/* Find the right roothub. */
-	hcd = xhci_to_hcd(xhci);
-	if ((major_revision == 0x03) != (hcd->speed >= HCD_USB3))
-		hcd = xhci->shared_hcd;
-
-	if (major_revision == 0) {
-		xhci_warn(xhci, "Event for port %u not in "
-				"Extended Capabilities, ignoring.\n",
-				port_id);
-		bogus_port_status = true;
-		goto cleanup;
-	}
-	if (major_revision == DUPLICATE_ENTRY) {
-		xhci_warn(xhci, "Event for port %u duplicated in"
-				"Extended Capabilities, ignoring.\n",
-				port_id);
+	port = &xhci->hw_ports[port_id - 1];
+	if (!port || !port->rhub || port->hcd_portnum == DUPLICATE_ENTRY) {
+		xhci_warn(xhci, "Event for invalid port %u\n", port_id);
 		bogus_port_status = true;
 		goto cleanup;
 	}
 
-	/*
-	 * Hardware port IDs reported by a Port Status Change Event include USB
-	 * 3.0 and USB 2.0 ports.  We want to check if the port has reported a
-	 * resume event, but we first need to translate the hardware port ID
-	 * into the index into the ports on the correct split roothub, and the
-	 * correct bus_state structure.
-	 */
+	hcd = port->rhub->hcd;
 	bus_state = &xhci->bus_state[hcd_index(hcd)];
 	if (hcd->speed >= HCD_USB3)
 		port_array = xhci->usb3_ports;
 	else
 		port_array = xhci->usb2_ports;
-	/* Find the faked port hub number */
-	faked_port_index = find_faked_portnum_from_hw_portnum(hcd, xhci,
-			port_id);
-	portsc = readl(port_array[faked_port_index]);
+
+	faked_port_index = port->hcd_portnum;
+	portsc = readl(port->addr);
 
 	trace_xhci_handle_port_status(faked_port_index, portsc);