[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 #9 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
You can't increase the vblank evasion time to a value above ~16 ms because of
physics. :)

Assuming the problem is inside i915, there are 2 solutions, one easy and one
hard..
1. Use the DOUBLE_BUFFER_CTL register to lock out updates, like above. Least
amount of lines of code changed.
2. Grab dev_priv->uncore.lock in pipe_update_start and release it in
pipe_update_end. All register updates need this lock so grabbing it would
reduce contention.

I've posted the first solution to intel-gfx as a RFC, and to see if it passes
our CI:
https://patchwork.freedesktop.org/series/37879/

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