drm/i915: Split TGL 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/20200929233449.32323-9-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>

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

@@ -1157,49 +1157,64 @@ ehl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 }
 
 static const struct cnl_ddi_buf_trans *
-tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
+tgl_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:
-		if (dev_priv->vbt.edp.hobl) {
-			struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+}
 
-			if (!intel_dp->hobl_failed && rate <= 540000) {
-				/* Same table applies to TGL, RKL and DG1 */
-				*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_edp_hbr2_hobl);
-				return tgl_combo_phy_ddi_translations_edp_hbr2_hobl;
+static const struct cnl_ddi_buf_trans *
+tgl_get_combo_buf_trans_dp(struct intel_encoder *encoder, int type, int rate,
+			   int *n_entries)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+
+	if (rate > 270000) {
+		if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv)) {
+			*n_entries = ARRAY_SIZE(tgl_uy_combo_phy_ddi_translations_dp_hbr2);
+			return tgl_uy_combo_phy_ddi_translations_dp_hbr2;
+		} else {
+			*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr2);
+			return tgl_combo_phy_ddi_translations_dp_hbr2;
 		}
+	} else {
+		*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr);
+		return tgl_combo_phy_ddi_translations_dp_hbr;
 	}
+}
+
+static const struct cnl_ddi_buf_trans *
+tgl_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);
+	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
 	if (rate > 540000) {
 		*n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_edp_hbr3);
 		return icl_combo_phy_ddi_translations_edp_hbr3;
+	} else if (dev_priv->vbt.edp.hobl && !intel_dp->hobl_failed) {
+		*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_edp_hbr2_hobl);
+		return tgl_combo_phy_ddi_translations_edp_hbr2_hobl;
 	} else if (dev_priv->vbt.edp.low_vswing) {
 		*n_entries = ARRAY_SIZE(icl_combo_phy_ddi_translations_edp_hbr2);
 		return icl_combo_phy_ddi_translations_edp_hbr2;
 	}
-		/* fall through */
-	default:
-		/* All combo DP and eDP ports that do not support low_vswing */
-		if (rate > 270000) {
-			if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv)) {
-				*n_entries = ARRAY_SIZE(tgl_uy_combo_phy_ddi_translations_dp_hbr2);
-				return tgl_uy_combo_phy_ddi_translations_dp_hbr2;
-			}
 
-			*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr2);
-			return tgl_combo_phy_ddi_translations_dp_hbr2;
-		}
+	return tgl_get_combo_buf_trans_dp(encoder, type, rate, n_entries);
+}
 
-		*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr);
-		return tgl_combo_phy_ddi_translations_dp_hbr;
-	}
+static const struct cnl_ddi_buf_trans *
+tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
+			int *n_entries)
+{
+	if (type == INTEL_OUTPUT_HDMI)
+		return tgl_get_combo_buf_trans_hdmi(encoder, type, rate, n_entries);
+	else if (type == INTEL_OUTPUT_EDP)
+		return tgl_get_combo_buf_trans_edp(encoder, type, rate, n_entries);
+	else
+		return tgl_get_combo_buf_trans_dp(encoder, type, rate, n_entries);
 }
 
 static const struct tgl_dkl_phy_ddi_buf_trans *