drm/i915/tgl: Add new voltage swing table

This new HBR2 table for TGL-U and TGL-Y is required to pass
DisplayPort compliance.

BSpec: 49291
Cc: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Khaled Almahallawy<khaled.almahallawy@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200807192629.64134-2-jose.souza@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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

@@ -706,6 +706,20 @@ static const struct cnl_ddi_buf_trans tgl_combo_phy_ddi_translations_dp_hbr2[] =
 	{ 0x6, 0x7F, 0x3F, 0x00, 0x00 },	/* 900   900      0.0   */
 };
 
+static const struct cnl_ddi_buf_trans tgl_uy_combo_phy_ddi_translations_dp_hbr2[] = {
+						/* NT mV Trans mV db    */
+	{ 0xA, 0x35, 0x3F, 0x00, 0x00 },	/* 350   350      0.0   */
+	{ 0xA, 0x4F, 0x36, 0x00, 0x09 },	/* 350   500      3.1   */
+	{ 0xC, 0x60, 0x32, 0x00, 0x0D },	/* 350   700      6.0   */
+	{ 0xC, 0x7F, 0x2D, 0x00, 0x12 },	/* 350   900      8.2   */
+	{ 0xC, 0x47, 0x3F, 0x00, 0x00 },	/* 500   500      0.0   */
+	{ 0xC, 0x6F, 0x36, 0x00, 0x09 },	/* 500   700      2.9   */
+	{ 0x6, 0x7D, 0x32, 0x00, 0x0D },	/* 500   900      5.1   */
+	{ 0x6, 0x60, 0x3C, 0x00, 0x03 },	/* 650   700      0.6   */
+	{ 0x6, 0x7F, 0x34, 0x00, 0x0B },	/* 600   900      3.5   */
+	{ 0x6, 0x7F, 0x3F, 0x00, 0x00 },	/* 900   900      0.0   */
+};
+
 /*
  * Cloned the HOBL entry to comply with the voltage and pre-emphasis entries
  * that DisplayPort specification requires
@@ -1087,6 +1101,11 @@ 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 (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;
 	}