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

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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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Alan Stern 2013-03-27 16:14:19 -04:00 • committed by Greg Kroah-Hartman

parent e9e88fb7bc

commit 0aa2832dd0

1 changed files with 21 additions and 6 deletions

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drivers/usb/core/hub.c

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