[Bug 1518816] Re: xhci: Workaround to get Intel xHCI reset working more reliably

Ubuntu 15.10 (Wily Werewolf) has reached end of life, so this bug will
not be fixed for that specific release.

** Changed in: linux (Ubuntu Wily)
Status: Fix Committed => Won't Fix

** Changed in: linux (Ubuntu)
Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1518816

Title:
xhci: Workaround to get Intel xHCI reset working more reliably

Status in linux package in Ubuntu:
Invalid
Status in linux source package in Trusty:
Fix Released
Status in linux source package in Vivid:
Won't Fix
Status in linux source package in Wily:
Won't Fix

Bug description:
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 <rajmohan.mani@intel.com>
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.

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