xhci: Workaround to get Intel xHCI reset working more reliably

[XiongZhang]

 SRU Justification:
 On all of Intel's shipping xHCI platforms, including both servers and clients, the controller can cause the shutdown process to hang.
  This is because existing Intel xHCI controllers require a delay of 1 mS,after setting the CMD_RESET bit in command register, before accessing any HC registers. This allows the HC to complete the reset operation and be ready for HC register access.

Fix:
Patch in 4.4-rc2
commit a5964396190d0c40dd549c23848c282fffa5d1f2
Author: Rajmohan Mani <email address hidden>
Date: Wed Nov 18 10:48:20 2015 +0200

    xhci: Workaround to get Intel xHCI reset working more reliably

Regression Potential: Just add a 1ms delay for xhci_reset, so regressions are very unlikely.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1518816

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Andy Whitcroft (apw)]

This bug was nominated against a series that is no longer supported, ie vivid. The bug task representing the vivid nomination is being closed as Won't Fix.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.