diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
index c947e6511fbc..76b7c0fc9011 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
@@ -596,6 +596,21 @@ bool intel_dp_link_caps_filter_add(struct intel_dp_link_caps *link_caps,
 	return true;
 }
 
+static bool intel_dp_link_caps_filter_remove(struct intel_dp_link_caps *link_caps,
+					     struct intel_dp_link_caps_filter *filter,
+					     const struct intel_dp_link_config *config)
+{
+	int idx;
+
+	idx = find_config_idx(link_caps, get_allowed_config_filter(link_caps), config);
+	if (idx < 0)
+		return false;
+
+	filter->config_mask &= ~BIT(idx);
+
+	return true;
+}
+
 static void set_max_link_limits(struct intel_dp_link_caps *link_caps,
 				const struct intel_dp_link_config *max_link_limits)
 {
@@ -618,6 +633,46 @@ static void reset_max_link_limits_reenable_all(struct intel_dp_link_caps *link_c
 	reset_max_link_limits(link_caps);
 }
 
+/**
+ * intel_dp_link_caps_disable_config - disable a configuration
+ * @link_caps: link capabilities state
+ * @config: configuration to disable
+ *
+ * Disable the configuration identified by @config. This removes the
+ * configuration from the set of allowed configurations. The disabling
+ * shouldn't leave the remaining configuration set empty.
+ *
+ * The configuration remains disallowed until intel_dp_link_caps() with
+ * reset=%true or changed sink capabilities is called, or
+ * intel_dp_link_caps_reset() is called. Each of these happens after a
+ * new sink is connected or the currently connected sink changes its
+ * capabilities.
+ *
+ * Return:
+ * - %true  if @config was valid and the derived state was updated.
+ * - %false if @config was invalid or the remaining configuration set
+ *   would remain empty.
+ */
+bool intel_dp_link_caps_disable_config(struct intel_dp_link_caps *link_caps,
+				       const struct intel_dp_link_config *config)
+{
+	struct intel_dp_link_caps_filter enabled_configs = link_caps->enabled_configs;
+	struct intel_dp_link_config forced_params;
+
+	if (!intel_dp_link_caps_filter_remove(link_caps, &enabled_configs, config))
+		return false;
+
+	intel_dp_link_caps_get_forced_params(link_caps, &forced_params);
+
+	if (!calc_allowed_config_filter(link_caps, enabled_configs,
+					&link_caps->max_limits, &forced_params).config_mask)
+		return false;
+
+	link_caps->enabled_configs = enabled_configs;
+
+	return true;
+}
+
 /**
  * intel_dp_link_caps_get_max_limits - get the current maximum link limits
  * @link_caps: link capabilities state
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_caps.h b/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
index 5c0d66006214..56c585eb5a13 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
@@ -136,6 +136,9 @@ bool intel_dp_link_caps_get_max_config(struct intel_dp_link_caps *link_caps,
 void intel_dp_link_caps_get_max_bw_config(struct intel_dp_link_caps *link_caps,
 					  struct intel_dp_link_config *max_config);
 
+bool intel_dp_link_caps_disable_config(struct intel_dp_link_caps *link_caps,
+				       const struct intel_dp_link_config *config);
+
 void intel_dp_link_caps_get_max_limits(struct intel_dp_link_caps *link_caps,
 				       struct intel_dp_link_config *max_link_limits);
 bool intel_dp_link_caps_set_max_limits(struct intel_dp_link_caps *link_caps,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 1c12503908d8..a592bfab5ff0 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -1894,6 +1894,10 @@ static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
 	struct intel_display *display = to_intel_display(intel_dp);
 	struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
 	struct intel_dp_link_config max_link_limits;
+	struct intel_dp_link_config current_config = {
+		.rate = crtc_state->port_clock,
+		.lane_count = crtc_state->lane_count,
+	};
 	int new_link_rate;
 	int new_lane_count;
 	int err = -1;
@@ -1920,6 +1924,13 @@ static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
 	intel_dp_link_caps_get_max_limits(link_caps, &max_link_limits);
 	intel_dp_link_caps_reset_max_limits(link_caps);
 
+	/*
+	 * TODO: Make fallback depend only on disabling the current config,
+	 * once max_limit no longer constrains the allowed config set. Then
+	 * disabling the current config will define the allowed configs for
+	 * the subsequent modeset, so there will be no need to select a
+	 * reduced config separately here.
+	 */
 	if (!reduce_link_params(intel_dp, crtc_state, &new_link_rate, &new_lane_count))
 		goto out_restore_max_limits;
 
@@ -1933,6 +1944,14 @@ static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
 		goto out_restore_max_limits;
 	}
 
+	/*
+	 * Shouldn't fail: the current config was enabled, and reducing the
+	 * link parameters should still leave the fallback config allowed.
+	 */
+	if (drm_WARN_ON(display->drm,
+			!intel_dp_link_caps_disable_config(link_caps, &current_config)))
+		return -1;
+
 	lt_dbg(intel_dp, DP_PHY_DPRX,
 	       "Reducing link parameters from %dx%d to %dx%d\n",
 	       crtc_state->lane_count, crtc_state->port_clock,