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drm/i915/dp: Markup pps lock power well
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Track where and when we acquire and release the power well for pps
access along the dp aux link, with a view to detecting if we leak any
wakerefs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114142129.24398-18-chris@chris-wilson.co.uk
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Chris Wilson committed Jan 14, 2019
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