Public bug reported:
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.m...@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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1518816
Title:
xhci: Workaround to get Intel xHCI reset working more reliably
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