drm/i915: use drm_modeset_lock_all
Two exceptions:
- debugfs files only read information which is not related to crtc, so
can stay on the modeset_config lock.
- Same holds for the edp vdd work in intel_dp.c. Add a corresponding
WARN_ON and a comment next to the intel_dp struct fields for
documentation.
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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