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

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

--- Comment #19 from Vladimir Kondratyev <wulf at freebsd.org> ---
Created attachment 207593
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=207593&action=edit
ig4 suspend/resume with other improvements

It is appeared that just save/restore controller registers is not enough to do
a suspend/resume. Software context should be preserved too (it contains current
slave address) and resume path requires polling support from ig4 as interrupts
are not working at this moment at least on my laptop.
I tried to address these and some others issues in my version of ig4 driver
which is attached.
It requires at least post r352243 current to be applied cleanly, but can be
easily modified to be applicable to FBSD12

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