diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index fbd857f2bdb2..2ac92e7f5335 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2827,6 +2827,9 @@ static void icl_mg_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
 	int n_entries, ln;
 	u32 val;
 
+	if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
+		return;
+
 	ddi_translations = icl_get_mg_buf_trans(encoder, crtc_state, &n_entries);
 
 	if (drm_WARN_ON_ONCE(&dev_priv->drm, !ddi_translations))
@@ -2962,6 +2965,9 @@ tgl_dkl_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
 	u32 val, dpcnt_mask, dpcnt_val;
 	int n_entries, ln;
 
+	if (enc_to_dig_port(encoder)->tc_mode == TC_PORT_TBT_ALT)
+		return;
+
 	ddi_translations = tgl_get_dkl_buf_trans(encoder, crtc_state, &n_entries);
 
 	if (drm_WARN_ON_ONCE(&dev_priv->drm, !ddi_translations))