drm/i915/mst: Wait for ACT sent before enabling the pipe

The correct sequence according to bspec is to wait for the ACT sent
status before we turn on the pipe. Make it so.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200507144125.2458-1-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>

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

@@ -512,10 +512,6 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 
 	intel_ddi_enable_transcoder_func(encoder, pipe_config);
 
-	intel_enable_pipe(pipe_config);
-
-	intel_crtc_vblank_on(pipe_config);
-
 	drm_dbg_kms(&dev_priv->drm, "active links %d\n",
 		    intel_dp->active_mst_links);
 
@@ -526,6 +522,11 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 	drm_dp_check_act_status(&intel_dp->mst_mgr);
 
 	drm_dp_update_payload_part2(&intel_dp->mst_mgr);
+
+	intel_enable_pipe(pipe_config);
+
+	intel_crtc_vblank_on(pipe_config);
+
 	if (pipe_config->has_audio)
 		intel_audio_codec_enable(encoder, pipe_config, conn_state);
 }