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

[Brad Figg]

On 09/25/2013 07:27 AM, Gavin Guo wrote:
> 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(-)
> 


-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com