diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index 996ae0608a62178e4fc8ea0dbbb91865bef124f7..dd45cbafcf42bbf685d161d573bd5bf421ef30ea 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -246,14 +246,21 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 	 * RKL,DG1:
 	 *   A(master) -> B(slave)
 	 *   C(master) -> D(slave)
+	 * ADL-S:
+	 *   A(master) -> B(slave), C(slave)
+	 *   D(master) -> E(slave)
 	 *
 	 * We must set the IREFGEN bit for any PHY acting as a master
 	 * to another PHY.
 	 */
-	if ((IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv)) && phy == PHY_C)
+	if (phy == PHY_A)
 		return true;
+	else if (IS_ALDERLAKE_S(dev_priv))
+		return phy == PHY_D;
+	else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
+		return phy == PHY_C;
 
-	return phy == PHY_A;
+	return false;
 }
 
 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,