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 7e26231a596a415f9b78d5b7121fb5ec45fcd9b4..081b5f189632e43afbc8bb0e124ab7af661b2e15 100644 (file)
--- a/sound/soc/codecs/es8328.c
+++ b/sound/soc/codecs/es8328.c
@@ -161,13 +161,16 @@ 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;
 }