[Bug 193500] Interrupt storm after loading i915kms module on Gen4 Intel GPU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193500

--- Comment #15 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Jan Kokemüller from comment #14)
> It is not related, except that there seems to be some kind of hardware bug.
> Sadly, zeroing GMBUS4 in intel_iic_reset does not seem to help.

So can you describe what the problem is and why your patch help ?

To see what kind of interrupt causes the storm, compile kernel with KTR_DRM and
enable ktr(4) tracing for it.

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