1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 9e6956c08688..5890500a3a8b 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -48,6 +48,9 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
         bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc,
                                            DP_DPCD_QUIRK_LIMITED_M_N);
 
+        if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
+                return false;
+
         pipe_config->has_pch_encoder = false;
         bpp = 24;
         if (intel_dp->compliance.test_data.bpc) {
@@ -366,6 +369,9 @@ intel_dp_mst_mode_valid(struct drm_connector *connector,
         if (!intel_dp)
                 return MODE_ERROR;
 
+        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+                return MODE_NO_DBLESCAN;
+
         max_link_clock = intel_dp_max_link_rate(intel_dp);
         max_lanes = intel_dp_max_lane_count(intel_dp);