diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 89b439dcf3a6af9f5799487fdc0f128a9b5cbe4a..047cd1796a51ab6409bce954a2c715c1f24e96ed 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -473,8 +473,14 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 
 	con = ovl_fmt_convert(ovl, fmt, blend_mode);
 	if (state->base.fb) {
-		con |= OVL_CON_AEN;
 		con |= state->base.alpha & OVL_CON_ALPHA;
+
+		/*
+		 * For blend_modes supported SoCs, always enable alpha blending.
+		 * For blend_modes unsupported SoCs, enable alpha blending when has_alpha is set.
+		 */
+		if (blend_mode || state->base.fb->format->has_alpha)
+			con |= OVL_CON_AEN;
 	}
 
 	/* CONST_BLD must be enabled for XRGB formats although the alpha channel