ASoC: madera: Fix event generation for rate controls

[ Upstream commit 980555e95f7cabdc9c80a07107622b097ba23703 ]

madera_adsp_rate_put always returns zero regardless of if the control
value was updated. This results in missing notifications to user-space
of the control change. Update the handling to return 1 when the
value is changed.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220623105120.1981154-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/madera.c b/sound/soc/codecs/madera.c
index d3e7a59..fd4fa1d 100644 (file)
--- a/sound/soc/codecs/madera.c
+++ b/sound/soc/codecs/madera.c
@@ -899,7 +899,7 @@ static int madera_adsp_rate_put(struct snd_kcontrol *kcontrol,
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        const int adsp_num = e->shift_l;
        const unsigned int item = ucontrol->value.enumerated.item[0];
-       int ret;
+       int ret = 0;
 
        if (item >= e->items)
                return -EINVAL;
@@ -916,10 +916,10 @@ static int madera_adsp_rate_put(struct snd_kcontrol *kcontrol,
                         "Cannot change '%s' while in use by active audio paths\n",
                         kcontrol->id.name);
                ret = -EBUSY;
-       } else {
+       } else if (priv->adsp_rate_cache[adsp_num] != e->values[item]) {
                /* Volatile register so defer until the codec is powered up */
                priv->adsp_rate_cache[adsp_num] = e->values[item];
-               ret = 0;
+               ret = 1;
        }
 
        mutex_unlock(&priv->rate_lock);