drm/i915/display/tgl: Use TGL DP tables for eDP ports without low power support

Reusing icl_get_combo_buf_trans() for eDP was causing the wrong table
being used when the eDP port don't support low power voltage swing table.
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Cc: Lee Shawn C <shawn.c.lee@intel.com>
Cc: Khaled Almahallawy <khaled.almahallawy@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826201549.83658-1-jose.souza@intel.com

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

@@ -1088,7 +1088,12 @@ tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 
-	if (type == INTEL_OUTPUT_EDP && dev_priv->vbt.edp.hobl) {
+	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) {
@@ -1098,9 +1103,17 @@ tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 			}
 		}
 
-	if (type == INTEL_OUTPUT_HDMI || type == INTEL_OUTPUT_EDP) {
-		return icl_get_combo_buf_trans(encoder, type, rate, n_entries);
-	} else if (rate > 270000) {
+		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.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;
@@ -1112,6 +1125,7 @@ tgl_get_combo_buf_trans(struct intel_encoder *encoder, int type, int rate,
 
 		*n_entries = ARRAY_SIZE(tgl_combo_phy_ddi_translations_dp_hbr);
 		return tgl_combo_phy_ddi_translations_dp_hbr;
+	}
 }
 
 static const struct tgl_dkl_phy_ddi_buf_trans *