[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 #49 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Agreed, that's why I put together a series that eliminates spinlock contention
and increases evasion time to 250 us. We run the evasion code with IRQs
disabled, so at the time critical point the code is fully deterministic, even
in the worst case.

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