[PATCH 5.4 191/240] ASoC: es8328: Fix event generation for deemphasis control

[Greg Kroah-Hartman]

From: Mark Brown <broonie@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220603123937.4013603-1-broonie@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/codecs/es8328.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/es8328.c b/sound/soc/codecs/es8328.c
index fdf64c29f563..4117ab6e9b6f 100644
--- 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;
 }
 
 
-- 
2.35.1