drm/i915: Fix audio ELD handling for DP MST

I forgot to call intel_audio_compute_config() on DP MST, which
means ELD doesn't get populated and passed to the audio driver.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/8097
Fixes: 5d986635 ("drm/i915/audio: Precompute the ELD")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230220151731.6852-1-ville.syrjala@linux.intel.comReviewed-by: Uma Shankar <uma.shankar@intel.com>

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -265,6 +265,19 @@ static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
 	return 0;
 }
 
+static bool intel_dp_mst_has_audio(const struct drm_connector_state *conn_state)
+{
+	const struct intel_digital_connector_state *intel_conn_state =
+		to_intel_digital_connector_state(conn_state);
+	struct intel_connector *connector =
+		to_intel_connector(conn_state->connector);
+
+	if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
+		return connector->port->has_audio;
+	else
+		return intel_conn_state->force_audio == HDMI_AUDIO_ON;
+}
+
 static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 				       struct intel_crtc_state *pipe_config,
 				       struct drm_connector_state *conn_state)
@@ -272,10 +285,6 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
 	struct intel_dp *intel_dp = &intel_mst->primary->dp;
-	struct intel_connector *connector =
-		to_intel_connector(conn_state->connector);
-	struct intel_digital_connector_state *intel_conn_state =
-		to_intel_digital_connector_state(conn_state);
 	const struct drm_display_mode *adjusted_mode =
 		&pipe_config->hw.adjusted_mode;
 	struct link_config_limits limits;
@@ -287,11 +296,9 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 	pipe_config->has_pch_encoder = false;
 
-	if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
-		pipe_config->has_audio = connector->port->has_audio;
-	else
-		pipe_config->has_audio =
-			intel_conn_state->force_audio == HDMI_AUDIO_ON;
+	pipe_config->has_audio =
+		intel_dp_mst_has_audio(conn_state) &&
+		intel_audio_compute_config(encoder, pipe_config, conn_state);
 
 	/*
 	 * for MST we always configure max link bw - the spec doesn't