drm/i915: Split EHL combo PHY buf trans per output type

Make the mess inside the buf trans funcs a bit more manageable by
splitting along the lines of output type.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200929233449.32323-8-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -1110,16 +1110,27 @@ icl_get_mg_buf_trans(struct intel_encoder *encoder, int type, int rate,
 }
 
 static const struct cnl_ddi_buf_trans *
-ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
+ehl_get_combo_buf_trans_hdmi(struct intel_encoder *encoder, int type, int rate,
 			     int *n_entries)
 {
-	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
-
-	switch (type) {
-	case INTEL_OUTPUT_HDMI:
 	*n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_hdmi);
 	return icl_combo_phy_ddi_translations_hdmi;
-	case INTEL_OUTPUT_EDP:
+}
+
+static const struct cnl_ddi_buf_trans *
+ehl_get_combo_buf_trans_dp(struct intel_encoder *encoder, int type, int rate,
+			   int *n_entries)
+{
+	*n_entries = ARRAY_SIZE(ehl_combo_phy_ddi_translations_dp);
+	return ehl_combo_phy_ddi_translations_dp;
+}
+
+static const struct cnl_ddi_buf_trans *
+ehl_get_combo_buf_trans_edp(struct intel_encoder *encoder, int type, int rate,
+			    int *n_entries)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+
 	if (dev_priv->vbt.edp.low_vswing) {
 		if (rate > 540000) {
 			*n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_edp_hbr3);
@@ -1129,12 +1140,20 @@ ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 			return icl_combo_phy_ddi_translations_edp_hbr2;
 		}
 	}
-		/* fall through */
-	default:
-		/* All combo DP and eDP ports that do not support low_vswing */
-		*n_entries = ARRAY_SIZE(ehl_combo_phy_ddi_translations_dp);
-		return ehl_combo_phy_ddi_translations_dp;
-	}
+
+	return ehl_get_combo_buf_trans_dp(encoder, type, rate, n_entries);
+}
+
+static const struct cnl_ddi_buf_trans *
+ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
+			int *n_entries)
+{
+	if (type == INTEL_OUTPUT_HDMI)
+		return ehl_get_combo_buf_trans_hdmi(encoder, type, rate, n_entries);
+	else if (type == INTEL_OUTPUT_EDP)
+		return ehl_get_combo_buf_trans_edp(encoder, type, rate, n_entries);
+	else
+		return ehl_get_combo_buf_trans_dp(encoder, type, rate, n_entries);
 }
 
 static const struct cnl_ddi_buf_trans *