From: Vandana Kannan <vandana.kannan@intel.com>

VSwing programming sequence as specified in the updated BXT BSpec
...
...
 
+void bxt_ddi_vswing_sequence(struct drm_device *dev, u32 level,
+			     enum port port, int type)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	const struct bxt_ddi_buf_trans *ddi_translations;
+	u32 n_entries, i;
+	uint32_t val;
+
+	if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {