ASoC: tas2770: Fix snd_soc_update_bits error handling

According the documentation for snd_soc_update_bits the API
will return a 1 if the update was successful with a value change,
a 0 if the update was successful with no value change or a negative
if the command just failed.

So the value of return in the driver needs to be checked for being less
then 0 or the caller may indicate failure when the value actually
changed.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20191007171157.17813-1-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2770.c

@@ -83,7 +83,8 @@ static int tas2770_codec_suspend(struct snd_soc_component *component)
 		TAS2770_PWR_CTRL,
 		TAS2770_PWR_CTRL_MASK,
 		TAS2770_PWR_CTRL_SHUTDOWN);
-	if (ret)
+
+	if (ret < 0)
 		return ret;
 
 	return 0;
@@ -97,8 +98,9 @@ static int tas2770_codec_resume(struct snd_soc_component *component)
 		TAS2770_PWR_CTRL,
 		TAS2770_PWR_CTRL_MASK,
 		TAS2770_PWR_CTRL_ACTIVE);
-	if (ret)
-		return -EINVAL;
+
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
@@ -150,7 +152,10 @@ static int tas2770_dac_event(struct snd_soc_dapm_widget *w,
 	}
 
 end:
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 static const struct snd_kcontrol_new isense_switch =
@@ -200,7 +205,10 @@ static int tas2770_mute(struct snd_soc_dai *dai, int mute)
 			TAS2770_PWR_CTRL_MASK,
 			TAS2770_PWR_CTRL_ACTIVE);
 
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 static int tas2770_set_bitwidth(struct tas2770_priv *tas2770, int bitwidth)
@@ -253,7 +261,10 @@ static int tas2770_set_bitwidth(struct tas2770_priv *tas2770, int bitwidth)
 		tas2770->i_sense_slot);
 
 end:
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 static int tas2770_set_samplerate(struct tas2770_priv *tas2770, int samplerate)
@@ -345,9 +356,11 @@ static int tas2770_set_samplerate(struct tas2770_priv *tas2770, int samplerate)
 	}
 
 end:
-	if (!ret)
-		tas2770->sampling_rate = samplerate;
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	tas2770->sampling_rate = samplerate;
+	return 0;
 }
 
 static int tas2770_hw_params(struct snd_pcm_substream *substream,
@@ -401,7 +414,7 @@ static int tas2770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	ret = snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG1,
 		TAS2770_TDM_CFG_REG1_RX_MASK,
 		asi_cfg_1);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
@@ -426,7 +439,7 @@ static int tas2770_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	ret = snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG1,
 		TAS2770_TDM_CFG_REG1_MASK,
 	(tdm_rx_start_slot << TAS2770_TDM_CFG_REG1_51_SHIFT));
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	tas2770->asi_format = fmt;
@@ -470,12 +483,12 @@ static int tas2770_set_dai_tdm_slot(struct snd_soc_dai *dai,
 	ret = snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG3,
 		TAS2770_TDM_CFG_REG3_30_MASK,
 		(left_slot << TAS2770_TDM_CFG_REG3_30_SHIFT));
-	if (ret)
+	if (ret < 0)
 		return ret;
 	ret = snd_soc_component_update_bits(component, TAS2770_TDM_CFG_REG3,
 		TAS2770_TDM_CFG_REG3_RXS_MASK,
 	(right_slot << TAS2770_TDM_CFG_REG3_RXS_SHIFT));
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	switch (slot_width) {
@@ -509,10 +522,11 @@ static int tas2770_set_dai_tdm_slot(struct snd_soc_dai *dai,
 		ret = -EINVAL;
 	}
 
-	if (!ret)
-		tas2770->slot_width = slot_width;
+	if (ret < 0)
+		return ret;
 
-	return ret;
+	tas2770->slot_width = slot_width;
+	return 0;
 }
 
 static struct snd_soc_dai_ops tas2770_dai_ops = {