[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 #18 from Jan Kokemüller <jan.kokemueller at gmail.com> ---
(In reply to Konstantin Belousov from comment #17)
> Try this, please.  It is somewhat closer to the current Linux code, by not
> setting asle->ardy in irq_postinstall hook.  It is different from Linux code
> which still enables pipestat interrupts in postinstall, but we will see.

Still no luck with this patch. The KTR dump indicates one less
"driver_irq_handler 10" as expected, though:
    48 driver_irq_handler 10
    47 object_change_domain pin_to_display_plan 0xfffff8001fad8200 41 0
    46 driver_irq_handler 10
    45 driver_irq_handler 10
    44 object_change_domain pin_to_display_plan 0xfffff8001fad8200 1 0
    43 object_change_domain flush_cpu_write 0xfffff8001fad8200 1 1
    42 object_clflush 0xfffff8001fad8200
    41 object_bind 0xfffff8001fad8200 42000 408000 1
    40 object_bind 0xfffff8001fad8600 22000 20000 1
    39 object_bind 0xfffff8001fad8800 21000 1000 1
    38 object_bind 0xfffff8001fad8a00 1000 20000 1
    37 object_bind 0xfffff8001fad8c00 0 1000 1
    36 i915_disable_vblank 1
    35 i915_disable_vblank 0

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