USB/xHCI: Enable USB 3.0 hub remote wakeup.

USB 3.0 hubs have a different remote wakeup policy than USB 2.0 hubs.
USB 2.0 hubs, once they have remote wakeup enabled, will always send
remote wakes when anything changes on a port.

However, USB 3.0 hubs have a per-port remote wake up policy that is off
by default.  The Set Feature remote wake mask can be changed for any
port, enabling remote wakeup for a connect, disconnect, or overcurrent
event, much like EHCI and xHCI host controller "wake on" port status
bits.  The bits are cleared to zero on the initial hub power on, or
after the hub has been reset.

Without this patch, when a USB 3.0 hub gets suspended, it will not send
a remote wakeup on device connect or disconnect.  This would show up to
the user as "dead ports" unless they ran lsusb -v (since newer versions
of lsusb use the sysfs files, rather than sending control transfers).

Change the hub driver's suspend method to enable remote wake up for
disconnect, connect, and overcurrent for all ports on the hub.  Modify
the xHCI driver's roothub code to handle that request, and set the "wake
on" bits in the port status registers accordingly.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 70622d633fda..b3137fa65f2a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2731,6 +2731,7 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
         struct usb_hub          *hub = usb_get_intfdata (intf);
         struct usb_device       *hdev = hub->hdev;
         unsigned                port1;
+        int                     status;
 
         /* Warn if children aren't already suspended */
         for (port1 = 1; port1 <= hdev->maxchild; port1++) {
@@ -2743,6 +2744,17 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
                                 return -EBUSY;
                 }
         }
+        if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
+                /* Enable hub to send remote wakeup for all ports. */
+                for (port1 = 1; port1 <= hdev->maxchild; port1++) {
+                        status = set_port_feature(hdev,
+                                        port1 |
+                                        USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
+                                        USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
+                                        USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
+                                        USB_PORT_FEAT_REMOTE_WAKE_MASK);
+                }
+        }
 
         dev_dbg(&intf->dev, "%s\n", __func__);