drm/i915/dvo: implement get_hw_state
Similar to the sdvo code we poke the dvo encoder whether the output is active. Safe that dvo encoders are not standardized, so this requires a new callback into the dvo chip driver. Hence implement that for all 6 dvo drivers. v2: With the newly added ns2501 we now have 6 dvo drivers instead of just 5 ... Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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