drm/i915: prepare load-detect pipe code for dpms changes
A few things need adjustement: - Change the dpms state by calling the dpms connector function and not some crtc helper internal callbacks. Otherwise this will break once we switch to our own dpms handling. - Instead of tracking and restoring intel_crtc->dpms_mode use the connector's dpms variable - the former relies on the dpms compuation rules used by the crtc helper. And it would break when the encoder is cloned and the other output has a different dpms state. But luckily no one is crazy enough for that. - Properly clear the connector -> encoder -> crtc linking, even when failing (note that the crtc helper removes the encoder -> crtc link in disabled_unused_functions for us). Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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