diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index edfd22bea9e7a..0f9b0123df39a 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3934,9 +3934,11 @@ static void intel_ddi_read_func_ctl(struct intel_encoder *encoder,
 		pipe_config->lane_count =
 			((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT) + 1;
 
-		if (DISPLAY_VER(dev_priv) >= 12)
-			pipe_config->mst_master_transcoder =
+		if (DISPLAY_VER(dev_priv) >= 12) {
+			if (!intel_crtc_is_bigjoiner_slave(pipe_config))
+				pipe_config->mst_master_transcoder =
 					REG_FIELD_GET(TRANS_DDI_MST_TRANSPORT_SELECT_MASK, temp);
+		}
 
 		intel_cpu_transcoder_get_m1_n1(crtc, cpu_transcoder,
 					       &pipe_config->dp_m_n);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 53aec023ce92f..c8dc4c7bf53cf 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -525,6 +525,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
+	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 	struct intel_dp *intel_dp = &intel_mst->primary->dp;
 	const struct intel_connector *connector =
@@ -542,6 +543,10 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		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);
+
 	pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
 	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 	pipe_config->has_pch_encoder = false;
@@ -955,6 +960,8 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 		drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	bool last_mst_stream;
+	u8 pipe_mask = intel_crtc_joined_pipe_mask(old_crtc_state);
+	struct intel_crtc *crtc;
 
 	intel_dp->active_mst_links--;
 	last_mst_stream = intel_dp->active_mst_links == 0;
@@ -962,7 +969,12 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 		    DISPLAY_VER(dev_priv) >= 12 && last_mst_stream &&
 		    !intel_dp_mst_is_master_trans(old_crtc_state));
 
-	intel_crtc_vblank_off(old_crtc_state);
+	for_each_intel_crtc_in_pipe_mask(&dev_priv->drm, crtc, pipe_mask) {
+		const struct intel_crtc_state *_old_crtc_state =
+			intel_atomic_get_old_crtc_state(state, crtc);
+
+		intel_crtc_vblank_off(_old_crtc_state);
+	}
 
 	intel_disable_transcoder(old_crtc_state);
 
@@ -980,12 +992,17 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 
 	intel_ddi_disable_transcoder_func(old_crtc_state);
 
-	intel_dsc_disable(old_crtc_state);
+	for_each_intel_crtc_in_pipe_mask(&dev_priv->drm, crtc, pipe_mask) {
+		const struct intel_crtc_state *_old_crtc_state =
+			intel_atomic_get_old_crtc_state(state, crtc);
 
-	if (DISPLAY_VER(dev_priv) >= 9)
-		skl_scaler_disable(old_crtc_state);
-	else
-		ilk_pfit_disable(old_crtc_state);
+		intel_dsc_disable(_old_crtc_state);
+
+		if (DISPLAY_VER(dev_priv) >= 9)
+			skl_scaler_disable(_old_crtc_state);
+		else
+			ilk_pfit_disable(_old_crtc_state);
+	}
 
 	/*
 	 * Power down mst path before disabling the port, otherwise we end
@@ -1131,6 +1148,8 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 		drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
 	enum transcoder trans = pipe_config->cpu_transcoder;
 	bool first_mst_stream = intel_dp->active_mst_links == 1;
+	u8 pipe_mask = intel_crtc_joined_pipe_mask(pipe_config);
+	struct intel_crtc *crtc;
 
 	drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
 
@@ -1172,7 +1191,19 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 
 	intel_enable_transcoder(pipe_config);
 
-	intel_crtc_vblank_on(pipe_config);
+	for_each_intel_crtc_in_pipe_mask_reverse(&dev_priv->drm, crtc, pipe_mask) {
+		const struct intel_crtc_state *new_crtc_state =
+			intel_atomic_get_new_crtc_state(state, crtc);
+
+		intel_dsc_enable(new_crtc_state);
+
+		if (DISPLAY_VER(dev_priv) >= 9)
+			skl_pfit_enable(new_crtc_state);
+		else
+			ilk_pfit_enable(new_crtc_state);
+
+		intel_crtc_vblank_on(new_crtc_state);
+	}
 
 	intel_hdcp_enable(state, encoder, pipe_config, conn_state);
 }
@@ -1330,12 +1361,6 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 	 *   corresponding link capabilities of the sink) in case the
 	 *   stream is uncompressed for it by the last branch device.
 	 */
-	if (mode_rate > max_rate || mode->clock > max_dotclk ||
-	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
-		*status = MODE_CLOCK_HIGH;
-		return 0;
-	}
-
 	if (mode->clock < 10000) {
 		*status = MODE_CLOCK_LOW;
 		return 0;
@@ -1349,8 +1374,10 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 	if (intel_dp_need_bigjoiner(intel_dp, mode->hdisplay, target_clock)) {
 		bigjoiner = true;
 		max_dotclk *= 2;
+	}
 
-		/* TODO: add support for bigjoiner */
+	if (mode_rate > max_rate || mode->clock > max_dotclk ||
+	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
 		*status = MODE_CLOCK_HIGH;
 		return 0;
 	}
@@ -1397,7 +1424,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 		return 0;
 	}
 
-	*status = intel_mode_valid_max_plane_size(dev_priv, mode, false);
+	*status = intel_mode_valid_max_plane_size(dev_priv, mode, bigjoiner);
 	return 0;
 }
 
