[Bug 238037] [PATCH] Implement ig4 suspend/resume

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238037

--- Comment #7 from J.R. Oldroyd <fbsd at opal.com> ---
There may be another bug.

After a suspend/resume on a Skylake system, the new ims driver (in phabricator
D16698) does not reset properly.  Reads fail with the message from the ims
driver "no data received".  A bus scan using:
    i2c -f /dev/iic1 -s
resets things after which it works ok again.

I am trying to figure out if we are still not saving and restoring all needed
registers on Skylake, or if the problem is that the bus needs some
reinitialization.  I suspect the latter given that the scan clears things, but
I am mentioning it here too.

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