From: Mark Brown <broonie@kernel.org>
Date: Wed, 20 Apr 2022 13:34:37 +0000 (+0100)
Subject: ASoC: da7219: Fix change notifications for tone generator frequency
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a5581587bbee2700aaee3971ac25f801cae24732;p=linux.git

ASoC: da7219: Fix change notifications for tone generator frequency

commit 08ef48404965cfef99343d6bbbcf75b88c74aa0e upstream.

The tone generator frequency control just returns 0 on successful write,
not a boolean value indicating if there was a change or not.  Compare
what was written with the value that was there previously so that
notifications are generated appropriately when the value changes.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220420133437.569229-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 13009d08b09ac..c7493549a9a50 100644
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -446,7 +446,7 @@ static int da7219_tonegen_freq_put(struct snd_kcontrol *kcontrol,
 	struct soc_mixer_control *mixer_ctrl =
 		(struct soc_mixer_control *) kcontrol->private_value;
 	unsigned int reg = mixer_ctrl->reg;
-	__le16 val;
+	__le16 val_new, val_old;
 	int ret;
 
 	/*
@@ -454,13 +454,19 @@ static int da7219_tonegen_freq_put(struct snd_kcontrol *kcontrol,
 	 * Therefore we need to convert to little endian here to align with
 	 * HW registers.
 	 */
-	val = cpu_to_le16(ucontrol->value.integer.value[0]);
+	val_new = cpu_to_le16(ucontrol->value.integer.value[0]);
 
 	mutex_lock(&da7219->ctrl_lock);
-	ret = regmap_raw_write(da7219->regmap, reg, &val, sizeof(val));
+	ret = regmap_raw_read(da7219->regmap, reg, &val_old, sizeof(val_old));
+	if (ret == 0 && (val_old != val_new))
+		ret = regmap_raw_write(da7219->regmap, reg,
+				&val_new, sizeof(val_new));
 	mutex_unlock(&da7219->ctrl_lock);
 
-	return ret;
+	if (ret < 0)
+		return ret;
+
+	return val_old != val_new;
 }