+static bool
+intel_dp_adjust_dithering(struct intel_dp *intel_dp,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_dp));
+ int max_lanes = intel_dp_max_lane_count(intel_dp);
+ int max_rate, mode_rate;
+
+ mode_rate = intel_dp_link_required(mode->clock, 24);
+ max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
+
+ if (mode_rate > max_rate) {
+ mode_rate = intel_dp_link_required(mode->clock, 18);
+ if (mode_rate > max_rate)
+ return false;
+
+ if (adjusted_mode)
+ adjusted_mode->private_flags
+ |= INTEL_MODE_DP_FORCE_6BPC;
+
+ return true;
+ }
+
+ return true;
+}
+