diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 409dbf8a2a1cd..b2744a9b4678c 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -626,6 +626,7 @@ struct intel_connector {
 		u8 fec_capability;
 
 		u8 dsc_hblank_expansion_quirk:1;
+		u8 dsc_decompression_enabled:1;
 	} dp;
 
 	/* Work struct to schedule a uevent on link train failure */
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 8bc4faa142a62..6d2fd068b8359 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1403,6 +1403,7 @@ static bool intel_dp_supports_dsc(const struct intel_connector *connector,
 		return false;
 
 	return intel_dsc_source_support(crtc_state) &&
+		connector->dp.dsc_decompression_aux &&
 		drm_dp_sink_supports_dsc(connector->dp.dsc_dpcd);
 }
 
@@ -2986,6 +2987,65 @@ intel_dp_sink_set_dsc_passthrough(const struct intel_connector *connector,
 			    str_enable_disable(enable));
 }
 
+static int intel_dp_dsc_aux_ref_count(struct intel_atomic_state *state,
+				      const struct intel_connector *connector,
+				      bool for_get_ref)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct drm_connector *_connector_iter;
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector_state *new_conn_state;
+	int ref_count = 0;
+	int i;
+
+	/*
+	 * On SST the decompression AUX device won't be shared, each connector
+	 * uses for this its own AUX targeting the sink device.
+	 */
+	if (!connector->mst_port)
+		return connector->dp.dsc_decompression_enabled ? 1 : 0;
+
+	for_each_oldnew_connector_in_state(&state->base, _connector_iter,
+					   old_conn_state, new_conn_state, i) {
+		const struct intel_connector *
+			connector_iter = to_intel_connector(_connector_iter);
+
+		if (connector_iter->mst_port != connector->mst_port)
+			continue;
+
+		if (!connector_iter->dp.dsc_decompression_enabled)
+			continue;
+
+		drm_WARN_ON(&i915->drm,
+			    (for_get_ref && !new_conn_state->crtc) ||
+			    (!for_get_ref && !old_conn_state->crtc));
+
+		if (connector_iter->dp.dsc_decompression_aux ==
+		    connector->dp.dsc_decompression_aux)
+			ref_count++;
+	}
+
+	return ref_count;
+}
+
+static bool intel_dp_dsc_aux_get_ref(struct intel_atomic_state *state,
+				     struct intel_connector *connector)
+{
+	bool ret = intel_dp_dsc_aux_ref_count(state, connector, true) == 0;
+
+	connector->dp.dsc_decompression_enabled = true;
+
+	return ret;
+}
+
+static bool intel_dp_dsc_aux_put_ref(struct intel_atomic_state *state,
+				     struct intel_connector *connector)
+{
+	connector->dp.dsc_decompression_enabled = false;
+
+	return intel_dp_dsc_aux_ref_count(state, connector, false) == 0;
+}
+
 /**
  * intel_dp_sink_enable_decompression - Enable DSC decompression in sink/last branch device
  * @state: atomic state
@@ -3009,7 +3069,11 @@ void intel_dp_sink_enable_decompression(struct intel_atomic_state *state,
 		return;
 
 	if (drm_WARN_ON(&i915->drm,
-			!connector->dp.dsc_decompression_aux))
+			!connector->dp.dsc_decompression_aux ||
+			connector->dp.dsc_decompression_enabled))
+		return;
+
+	if (!intel_dp_dsc_aux_get_ref(state, connector))
 		return;
 
 	intel_dp_sink_set_dsc_passthrough(connector, true);
@@ -3036,7 +3100,11 @@ void intel_dp_sink_disable_decompression(struct intel_atomic_state *state,
 		return;
 
 	if (drm_WARN_ON(&i915->drm,
-			!connector->dp.dsc_decompression_aux))
+			!connector->dp.dsc_decompression_aux ||
+			!connector->dp.dsc_decompression_enabled))
+		return;
+
+	if (!intel_dp_dsc_aux_put_ref(state, connector))
 		return;
 
 	intel_dp_sink_set_dsc_decompression(connector, false);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 355a573c97930..9037e11ec6e0d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -748,12 +748,7 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
 
 	intel_audio_codec_disable(encoder, old_crtc_state, old_conn_state);
 
-	if (intel_dp->active_mst_links == 1) /* last stream ? */
-		/*
-		 * TODO: disable decompression for all streams/in any MST ports, not
-		 * only in the first downstream branch device.
-		 */
-		intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
+	intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
 }
 
 static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
@@ -908,15 +903,11 @@ static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
 
 	drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
 
-	if (first_mst_stream) {
-		/*
-		 * TODO: enable decompression for all streams/in any MST ports, not
-		 * only in the first downstream branch device.
-		 */
-		intel_dp_sink_enable_decompression(state, connector, pipe_config);
+	intel_dp_sink_enable_decompression(state, connector, pipe_config);
+
+	if (first_mst_stream)
 		dig_port->base.pre_enable(state, &dig_port->base,
 						pipe_config, NULL);
-	}
 
 	intel_dp->active_mst_links++;
 
@@ -1362,7 +1353,7 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
 	 * At the moment the driver only supports enabling this globally in the
 	 * first downstream MST branch, via intel_dp's (root port) AUX.
 	 */
-	intel_connector->dp.dsc_decompression_aux = &intel_dp->aux;
+	intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
 	intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
 	intel_connector->dp.dsc_hblank_expansion_quirk =
 		detect_dsc_hblank_expansion_quirk(intel_connector);
diff --git a/drivers/gpu/drm/i915/display/intel_modeset_setup.c b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
index b8f43efb0ab5a..94eece7f63be3 100644
--- a/drivers/gpu/drm/i915/display/intel_modeset_setup.c
+++ b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
@@ -318,6 +318,12 @@ static void intel_modeset_update_connector_atomic_state(struct drm_i915_private
 			const struct intel_crtc_state *crtc_state =
 				to_intel_crtc_state(crtc->base.state);
 
+			if (crtc_state->dsc.compression_enable) {
+				drm_WARN_ON(&i915->drm, !connector->dp.dsc_decompression_aux);
+				connector->dp.dsc_decompression_enabled = true;
+			} else {
+				connector->dp.dsc_decompression_enabled = false;
+			}
 			conn_state->max_bpc = (crtc_state->pipe_bpp ?: 24) / 3;
 		}
 	}
