diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index b52df4db3e8fe..596635ceb9b2d 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1766,6 +1766,13 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 		dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
 }
 
+static inline bool
+drm_dp_max_downspread(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+	return dpcd[DP_DPCD_REV] >= 0x11 ||
+		dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5;
+}
+
 static inline bool
 drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 {