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

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

--- Comment #12 from Austin Shafer <ashafer at badland.io> ---
Created attachment 205573
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205573&action=edit
ig4 suspend with devidle set [needs testing]

Thanks for the input. Placing the device in the idle state before suspending
sounds like a good idea. The PCH datasheet does have a note saying this should
be done before any resets so I think you are right. Maybe I missed something
trivial while reading the datasheets, but why in `ig4iic_attach` is this only
done for skylake and not also done for haswell?

I went ahead and added this to a new patch, it would be amazing if someone
could try it out and let me know if it makes any difference. Thanks!

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