diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index 8e55eb3b2cee0..9c6bd522c43af 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -38,6 +38,7 @@
 #include "intel_atomic.h"
 #include "intel_cdclk.h"
 #include "intel_display_types.h"
+#include "intel_dp_mst.h"
 #include "intel_fdi.h"
 #include "intel_global_state.h"
 #include "intel_hdcp.h"
@@ -456,7 +457,7 @@ static int intel_atomic_check_link(struct intel_atomic_state *state,
 	if (ret)
 		return ret;
 
-	return 0;
+	return intel_dp_mst_atomic_check_link(state, limits);
 }
 
 static bool
@@ -467,6 +468,12 @@ assert_link_limit_change_valid(struct drm_i915_private *i915,
 	bool bpps_changed = false;
 	enum pipe pipe;
 
+	/* FEC can't be forced off after it was forced on. */
+	if (drm_WARN_ON(&i915->drm,
+			(old_limits->force_fec_pipes & new_limits->force_fec_pipes) !=
+			old_limits->force_fec_pipes))
+		return false;
+
 	for_each_pipe(i915, pipe) {
 		/* The bpp limit can only decrease. */
 		if (drm_WARN_ON(&i915->drm,
@@ -479,8 +486,11 @@ assert_link_limit_change_valid(struct drm_i915_private *i915,
 			bpps_changed = true;
 	}
 
+	/* At least one limit must change. */
 	if (drm_WARN_ON(&i915->drm,
-			!bpps_changed))
+			!bpps_changed &&
+			new_limits->force_fec_pipes ==
+			old_limits->force_fec_pipes))
 		return false;
 
 	return true;
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index de2152c94c161..60180ba4b9981 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -4673,6 +4673,7 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
 	if (ret)
 		return ret;
 
+	crtc_state->fec_enable = limits->force_fec_pipes & BIT(crtc->pipe);
 	crtc_state->max_link_bpp = limits->max_bpp[crtc->pipe];
 
 	if (crtc_state->pipe_bpp > crtc_state->max_link_bpp >> 4) {
@@ -6351,10 +6352,6 @@ int intel_atomic_check(struct drm_device *dev,
 		goto fail;
 	}
 
-	ret = drm_dp_mst_atomic_check(&state->base);
-	if (ret)
-		goto fail;
-
 	ret = intel_atomic_check_planes(state);
 	if (ret)
 		goto fail;
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index aa17ac64273a9..227a549b553b7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -67,6 +67,7 @@ struct intel_tc_port;
  */
 
 struct intel_link_bw_limits {
+	u8 force_fec_pipes;
 	u8 min_bpp_pipes;
 	/* in 1/16 bpp units */
 	int max_bpp[I915_MAX_PIPES];
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e85a6f89ca9e3..407b2f24aca80 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1318,8 +1318,8 @@ static bool intel_dp_source_supports_fec(struct intel_dp *intel_dp,
 	return false;
 }
 
-static bool intel_dp_supports_fec(struct intel_dp *intel_dp,
-				  const struct intel_crtc_state *pipe_config)
+bool intel_dp_supports_fec(struct intel_dp *intel_dp,
+			   const struct intel_crtc_state *pipe_config)
 {
 	return intel_dp_source_supports_fec(intel_dp, pipe_config) &&
 		drm_dp_sink_supports_fec(intel_dp->fec_capable);
@@ -1667,8 +1667,9 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 	int pipe_bpp;
 	int ret;
 
-	pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
-		intel_dp_supports_fec(intel_dp, pipe_config);
+	pipe_config->fec_enable = pipe_config->fec_enable ||
+		(!intel_dp_is_edp(intel_dp) &&
+		 intel_dp_supports_fec(intel_dp, pipe_config));
 
 	if (!intel_dp_supports_dsc(intel_dp, pipe_config))
 		return -EINVAL;
@@ -1918,6 +1919,10 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 	bool dsc_needed;
 	int ret = 0;
 
+	if (pipe_config->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, pipe_config))
+		return -EINVAL;
+
 	if (intel_dp_need_bigjoiner(intel_dp, adjusted_mode->crtc_hdisplay,
 				    adjusted_mode->crtc_clock))
 		pipe_config->bigjoiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 22c18310ae47d..3ada941547bf9 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -131,6 +131,8 @@ static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
 	return ~((1 << lane_count) - 1) & 0xf;
 }
 
+bool intel_dp_supports_fec(struct intel_dp *intel_dp,
+			   const struct intel_crtc_state *pipe_config);
 u32 intel_dp_mode_to_fec_clock(u32 mode_clock);
 u32 intel_dp_dsc_nearest_valid_bpp(struct drm_i915_private *i915, u32 bpp, u32 pipe_bpp);
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index b53254473e0d9..686ce61e16f8d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -358,6 +358,10 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	bool dsc_needed;
 	int ret = 0;
 
+	if (pipe_config->fec_enable &&
+	    !intel_dp_supports_fec(intel_dp, pipe_config))
+		return -EINVAL;
+
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return -EINVAL;
 
@@ -469,6 +473,107 @@ intel_dp_mst_transcoder_mask(struct intel_atomic_state *state,
 	return transcoders;
 }
 
+static u8 get_pipes_downstream_of_mst_port(struct intel_atomic_state *state,
+					   struct drm_dp_mst_topology_mgr *mst_mgr,
+					   struct drm_dp_mst_port *parent_port)
+{
+	const struct intel_digital_connector_state *conn_state;
+	struct intel_connector *connector;
+	u8 mask = 0;
+	int i;
+
+	for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
+		if (!conn_state->base.crtc)
+			continue;
+
+		if (&connector->mst_port->mst_mgr != mst_mgr)
+			continue;
+
+		if (connector->port != parent_port &&
+		    !drm_dp_mst_port_downstream_of_parent(mst_mgr,
+							  connector->port,
+							  parent_port))
+			continue;
+
+		mask |= BIT(to_intel_crtc(conn_state->base.crtc)->pipe);
+	}
+
+	return mask;
+}
+
+static int intel_dp_mst_check_fec_change(struct intel_atomic_state *state,
+					 struct drm_dp_mst_topology_mgr *mst_mgr,
+					 struct intel_link_bw_limits *limits)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+	u8 mst_pipe_mask;
+	u8 fec_pipe_mask = 0;
+	int ret;
+
+	mst_pipe_mask = get_pipes_downstream_of_mst_port(state, mst_mgr, NULL);
+
+	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, mst_pipe_mask) {
+		struct intel_crtc_state *crtc_state =
+			intel_atomic_get_new_crtc_state(state, crtc);
+
+		if (crtc_state->fec_enable)
+			fec_pipe_mask |= BIT(crtc->pipe);
+	}
+
+	if (!fec_pipe_mask || mst_pipe_mask == fec_pipe_mask)
+		return 0;
+
+	limits->force_fec_pipes |= mst_pipe_mask;
+	ret = intel_modeset_pipes_in_mask(state, "MST FEC",
+					  mst_pipe_mask);
+
+	return ret ? : -EAGAIN;
+}
+
+static int intel_dp_mst_check_bw(struct intel_atomic_state *state,
+				 struct drm_dp_mst_topology_mgr *mst_mgr,
+				 struct drm_dp_mst_topology_state *mst_state,
+				 struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_port *mst_port;
+	u8 mst_port_pipes;
+	int ret;
+
+	ret = drm_dp_mst_atomic_check_mgr(&state->base, mst_mgr, mst_state, &mst_port);
+	if (ret != -ENOSPC)
+		return ret;
+
+	mst_port_pipes = get_pipes_downstream_of_mst_port(state, mst_mgr, mst_port);
+
+	ret = intel_atomic_reduce_link_bpp(state, limits,
+					   mst_port_pipes, "MST link BW");
+
+	return ret ? : -EAGAIN;
+}
+
+int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
+				   struct intel_link_bw_limits *limits)
+{
+	struct drm_dp_mst_topology_mgr *mgr;
+	struct drm_dp_mst_topology_state *mst_state;
+	int ret;
+	int i;
+
+	for_each_new_mst_mgr_in_state(&state->base, mgr, mst_state, i) {
+		ret = intel_dp_mst_check_fec_change(state, mgr, limits);
+		if (ret)
+			return ret;
+
+		ret = intel_dp_mst_check_bw(state, mgr, mst_state,
+					    limits);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int intel_dp_mst_compute_config_late(struct intel_encoder *encoder,
 					    struct intel_crtc_state *crtc_state,
 					    struct drm_connector_state *conn_state)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h b/drivers/gpu/drm/i915/display/intel_dp_mst.h
index f1815bb722672..4e836b9ac6061 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h
@@ -13,6 +13,7 @@ struct intel_crtc;
 struct intel_crtc_state;
 struct intel_digital_port;
 struct intel_dp;
+struct intel_link_bw_limits;
 
 int intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_id);
 void intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port);
@@ -22,5 +23,7 @@ bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state);
 bool intel_dp_mst_source_support(struct intel_dp *intel_dp);
 int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
 					     struct intel_crtc *crtc);
+int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
+				   struct intel_link_bw_limits *limits);
 
 #endif /* __INTEL_DP_MST_H__ */
