1 files changed, 38 insertions, 6 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 2732ef660c5c..7b01094d7993 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -462,6 +462,42 @@ void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
         }
 }
 
+/* Updates Link Status for super Speed port */
+static void xhci_hub_report_link_state(u32 *status, u32 status_reg)
+{
+        u32 pls = status_reg & PORT_PLS_MASK;
+
+        /* resume state is a xHCI internal state.
+         * Do not report it to usb core.
+         */
+        if (pls == XDEV_RESUME)
+                return;
+
+        /* When the CAS bit is set then warm reset
+         * should be performed on port
+         */
+        if (status_reg & PORT_CAS) {
+                /* The CAS bit can be set while the port is
+                 * in any link state.
+                 * Only roothubs have CAS bit, so we
+                 * pretend to be in compliance mode
+                 * unless we're already in compliance
+                 * or the inactive state.
+                 */
+                if (pls != USB_SS_PORT_LS_COMP_MOD &&
+                    pls != USB_SS_PORT_LS_SS_INACTIVE) {
+                        pls = USB_SS_PORT_LS_COMP_MOD;
+                }
+                /* Return also connection bit -
+                 * hub state machine resets port
+                 * when this bit is set.
+                 */
+                pls |= USB_PORT_STAT_CONNECTION;
+        }
+        /* update status field */
+        *status |= pls;
+}
+
 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 u16 wIndex, char *buf, u16 wLength)
 {
@@ -606,13 +642,9 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         else
                                 status |= USB_PORT_STAT_POWER;
                 }
-                /* Port Link State */
+                /* Update Port Link State for super speed ports*/
                 if (hcd->speed == HCD_USB3) {
-                        /* resume state is a xHCI internal state.
-                         * Do not report it to usb core.
-                         */
-                        if ((temp & PORT_PLS_MASK) != XDEV_RESUME)
-                                status |= (temp & PORT_PLS_MASK);
+                        xhci_hub_report_link_state(&status, temp);
                 }
                 if (bus_state->port_c_suspend & (1 << wIndex))
                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;