diff --git a/sound/soc/codecs/si476x.c b/sound/soc/codecs/si476x.c
index 03645ce42063ac7ad65462e6b2f386e2d05d5f7a..52e7cb08434bd281354c4a34f520f16c38b0446f 100644
--- a/sound/soc/codecs/si476x.c
+++ b/sound/soc/codecs/si476x.c
@@ -73,6 +73,7 @@ static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
 				    unsigned int fmt)
 {
+	struct si476x_core *core = i2c_mfd_cell_to_core(codec_dai->dev);
 	int err;
 	u16 format = 0;
 
@@ -136,9 +137,14 @@ static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		return -EINVAL;
 	}
 
+	si476x_core_lock(core);
+
 	err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 				  SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
 				  format);
+
+	si476x_core_unlock(core);
+
 	if (err < 0) {
 		dev_err(codec_dai->codec->dev, "Failed to set output format\n");
 		return err;
@@ -151,6 +157,7 @@ static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *params,
 				  struct snd_soc_dai *dai)
 {
+	struct si476x_core *core = i2c_mfd_cell_to_core(dai->dev);
 	int rate, width, err;
 
 	rate = params_rate(params);
@@ -176,11 +183,13 @@ static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
+	si476x_core_lock(core);
+
 	err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
 			    rate);
 	if (err < 0) {
 		dev_err(dai->codec->dev, "Failed to set sample rate\n");
-		return err;
+		goto out;
 	}
 
 	err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
@@ -189,10 +198,13 @@ static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 				  (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
 	if (err < 0) {
 		dev_err(dai->codec->dev, "Failed to set output width\n");
-		return err;
+		goto out;
 	}
 
-	return 0;
+out:
+	si476x_core_unlock(core);
+
+	return err;
 }
 
 static int si476x_codec_probe(struct snd_soc_codec *codec)