drm/i915: Add limited color range readout for HDMI/DP ports on g4x/vlv/chv
The limited color range knob is in the port registers on g4x and vlv/chv for HDMI, and on g4x for DP. Add the relevant code to read out the hardware state into pipe config. On vlv/chv the DP port limited color range knob is in PIPECONF for which we already have readout code. Cc: Chris Clayton <chris2553@googlemail.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Tested-by: NChris Clayton <chris2553@googlemail.com> Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NJani Nikula <jani.nikula@intel.com>
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