drm/amd/display: add register offset != 0 check.

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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/dce/dce_stream_encoder.c

@@ -72,7 +72,8 @@ static void dce110_update_generic_info_packet(
 	uint32_t max_retries = 50;
 
 	/*we need turn on clock before programming AFMT block*/
-	REG_UPDATE(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, 1);
+	if (REG(AFMT_CNTL))
+		REG_UPDATE(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, 1);
 
 	if (REG(AFMT_VBI_PACKET_CONTROL1)) {
 		if (packet_index >= 8)

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

@@ -1004,9 +1004,9 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx, int option)
 		/*don't free audio if it is from retrain or internal disable stream*/
 		if (option == FREE_ACQUIRED_RESOURCE && dc->caps.dynamic_audio == true) {
 			/*we have to dynamic arbitrate the audio endpoints*/
-			pipe_ctx->stream_res.audio = NULL;
 			/*we free the resource, need reset is_audio_acquired*/
 			update_audio_usage(&dc->current_state->res_ctx, dc->res_pool, pipe_ctx->stream_res.audio, false);
+			pipe_ctx->stream_res.audio = NULL;
 		}
 
 		/* TODO: notify audio driver for if audio modes list changed