[Quantal][SRU][PATCH 0/2] Add xhci lpm BESL support

[Gavin Guo]

BugLink: https://bugs.launchpad.net/bugs/1229576

== Quantal SRU Justification ==

The patches cherry-picked from upstream add implementaion of BESL 
support to xhci driver and set the BESL duration to 400us by default,
 which can reduce the sleep time and increase the transfer time for
bulk transfer to avoid the camera buffer overflow.

== Fix ==

commit b6e76371c888f5cb677f190a28444ac8875359ad
Author: Mathias Nyman <mathias.nyman at linux.intel.com>
Date:   Thu May 23 17:14:29 2013 +0300

    usb: xhci: define port register names and use them instead of magic numbers

Also there is little conflict happened when cherry-picked the commit, there is no
big modifications to the code, just added the patches.

commit a558ccdcc71c7770c5e80c926a31cfe8a3892a09
Author: Mathias Nyman <mathias.nyman at linux.intel.com>
Date:   Thu May 23 17:14:30 2013 +0300

    usb: xhci: add USB2 Link power management BESL support
    
    usb 2.0 devices with link power managment (LPM) can describe their idle link
    timeouts either in BESL or HIRD format, so far xHCI has only supported HIRD but
    later xHCI errata add BESL support as well
    
    BESL timeouts need to inform exit latency changes with an evaluate
    context command the same way USB 3.0 link PM code does.
    The same xhci_change_max_exit_latency() function is used as with USB3
    but code is pulled out from #ifdef CONFIG_PM as USB2.0 BESL LPM
    funcionality does not depend on CONFIG_PM.


== Test Case ==

A test kernel was built with these patches and tested by the original bug reporter.  The bug reporter states the test kernel resolved the bug. 

Mathias Nyman (2):
  usb: xhci: define port register names and use them instead of magic
    numbers
  usb: xhci: add USB2 Link power management BESL support

 drivers/usb/host/xhci-hub.c |   16 ++--
 drivers/usb/host/xhci.c     |  205 +++++++++++++++++++++++++++++--------------
 drivers/usb/host/xhci.h     |   26 ++++++
 3 files changed, 172 insertions(+), 75 deletions(-)

-- 
1.7.9.5