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>

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 91a1a82..4d2d0e8 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/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);