drm/i915: Add PSR docbook
Let's document PSR a bit. No functional changes. v2: Add actual DocBook entry and accept Daniel's improvements. Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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