[Bug 104975] Delay in skl_disable_plane() causes a system freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104975

--- Comment #47 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Because there's no way to do so. Everything between intel_pipe_update_begin and
intel_pipe_update_end must complete within 100/250 us, or we end up with
flickering on the screen. The only thing we can alter is to take all locks in
advance, to make the update itself limited to writing out a list of registers.
But even then we need to complete within 250 us, or we risk running into an
underrun.

But it seems the underlying hangs were fixed by enabling IPC support on BXT+.

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