drm/amd/display: re-enable audio after LT test

[Description]
Audio should be attached to the same pipe once it is attached.
We will not remove audio endpoint in disable stream.
We will reeanble the audio after automated link training test

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c

@@ -310,6 +310,20 @@ void dp_retrain_link_dp_test(struct dc_link *link,
 
 			link->dc->hwss.unblank_stream(&pipes[i],
 					link_setting);
+
+			if (pipes[i].stream_res.audio) {
+				/* notify audio driver for
+				 * audio modes of monitor */
+				pipes[i].stream_res.audio->funcs->az_enable(
+						pipes[i].stream_res.audio);
+
+				/* un-mute audio */
+				/* TODO: audio should be per stream rather than
+				 * per link */
+				pipes[i].stream_res.stream_enc->funcs->
+				audio_mute_control(
+					pipes[i].stream_res.stream_enc, false);
+			}
 		}
 	}
 }

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -758,8 +758,6 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 			pipe_ctx->stream_res.stream_enc->funcs->hdmi_audio_disable(
 					pipe_ctx->stream_res.stream_enc);
 
-		pipe_ctx->stream_res.audio = NULL;
-
 		/* TODO: notify audio driver for if audio modes list changed
 		 * add audio mode list change flag */
 		/* dal_audio_disable_azalia_audio_jack_presence(stream->audio,