From: Alan Stern <stern@rowland.harvard.edu>
Date: Wed, 27 Mar 2013 20:14:19 +0000 (-0400)
Subject: USB: use "global suspend" for system sleep on USB-2 buses
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~135^2~111
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0aa2832dd0d9d8609fd8f15139bc7572541a1215;p=pandora-kernel.git

USB: use "global suspend" for system sleep on USB-2 buses

This patch (as1674) speeds up system sleep transitions by not
suspending each individual device on a USB-1.1 or USB-2 bus.  The
devices will automatically go into suspend when their root hubs are
suspended (i.e., stop sending out Start-Of-Frame packets) -- this is
what the USB spec calls "global suspend".

Since this is what we do already when CONFIG_USB_SUSPEND isn't
enabled, it shouldn't cause any problems.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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