MFC r321207:

MFC r321207:
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  r321207 | ken | 2017-07-19 09:39:01 -0600 (Wed, 19 Jul 2017) | 14 lines

  Fix spurious timeouts on commands sent to mps(4) and mpr(4) controllers.

  mps_wait_command() and mpr_wait_command() were using getmicrotime() to
  determine elapsed time when checking for a timeout in polled mode.
  getmicrotime() isn't guaranteed to monotonically increase, and that
  caused spurious timeouts occasionally.

  Switch to using getmicrouptime(), which does increase monotonically.
  This fixes the spurious timeouts in my test case.

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Reviewed by:	slm, scottl
Sponsored by:	Spectra Logic

git-svn-id: svn://svn.freebsd.org/base/stable/10@321416 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f