From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 21 May 2014 01:08:12 +0000 (-0700)
Subject: usb: disable port power control if not supported in wHubCharacteristics
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~34^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9262c19d14c4;p=pandora-kernel.git

usb: disable port power control if not supported in wHubCharacteristics

A hub indicates whether it supports per-port power control via the
wHubCharacteristics field in its descriptor.  If it is not supported
a hub will still emulate ClearPortPower(PORT_POWER) requests by
stopping the link state machine.  However, since this does not save
power do not bother suspending.

This also consolidates support checks into a
hub_is_port_power_switchable() helper.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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