drm/i915: Set PIPECONF color range bit on Valleyview

VLV has the color range selection bit in the PIPECONF register.
Configure it appropriately.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[danvet: fixup rebase issues due to slightly different baseline.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -4583,6 +4583,13 @@ static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
 	else
 		pipeconf |= PIPECONF_PROGRESSIVE;
 
+	if (IS_VALLEYVIEW(dev)) {
+		if (intel_crtc->config.limited_color_range)
+			pipeconf |= PIPECONF_COLOR_RANGE_SELECT;
+		else
+			pipeconf &= ~PIPECONF_COLOR_RANGE_SELECT;
+	}
+
 	I915_WRITE(PIPECONF(intel_crtc->pipe), pipeconf);
 	POSTING_READ(PIPECONF(intel_crtc->pipe));
 }