From: Alan Stern <stern@rowland.harvard.edu>
Date: Thu, 10 Jan 2008 16:14:53 +0000 (-0500)
Subject: USB: EHCI: add a short delay to the bus_suspend routine
X-Git-Tag: v2.6.25-rc1~1075^2~29
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd930c931417295ac6b4d9fea62accc67192ac34;p=linux-2.6

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>
---

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 7919a411d5..ccd88ae011 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;