USB: EHCI: add a short delay to the bus_suspend routine

This patch (as1031) adds a short delay to the bus-suspend routine in
ehci-hcd.  Without it some devices disconnect when they should
suspend.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 7919a411d5f9..ccd88ae011c6 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -172,6 +172,10 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
                 }
         }
 
+        /* Apparently some devices need a >= 1-uframe delay here */
+        if (ehci->bus_suspended)
+                udelay(150);
+
         /* turn off now-idle HC */
         ehci_halt (ehci);
         hcd->state = HC_STATE_SUSPENDED;