drm/i915: WARN when trying to enabled an unused crtc
This is the first tiny step towards cross-checking the entire modeset state machine with WARNs. A crtc can only be enabled when it's actually in use, i.e. crtc->active imlies crtc->enabled. Unfortunately we can't (yet) check this when disabling the crtc, because the crtc helpers are a bit slopy with updating state and unconditionally update crtc->enabled before changing the hw state. Fixing that requires quite some more work. Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-Off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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