ASoC: es8328: Fix event generation for deemphasis control

[ Upstream commit 8259610c2ec01c5cbfb61882ae176aabacac9c19 ]

Currently the put() method for the deemphasis control returns 0 when a new
value is written to the control even if the value changed, meaning events
are not generated. Fix this, skip the work of updating the value when it is
unchanged and then return 1 after having done so.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220603123937.4013603-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/es8328.c b/sound/soc/codecs/es8328.c
index 3afa163f7652d36b2878e79b1feeb690e08a4cb4..dcb01889e177befc38a161dbe1c93e51af84adb4 100644 (file)
--- a/sound/soc/codecs/es8328.c
+++ b/sound/soc/codecs/es8328.c
@@ -165,13 +165,16 @@ static int es8328_put_deemph(struct snd_kcontrol *kcontrol,
        if (deemph > 1)
                return -EINVAL;
 
+       if (es8328->deemph == deemph)
+               return 0;
+
        ret = es8328_set_deemph(component);
        if (ret < 0)
                return ret;
 
        es8328->deemph = deemph;
 
-       return 0;
+       return 1;
 }