[PATCH AUTOSEL 5.18 13/41] ASoC: wcd9335: Fix spurious event generation

[Sasha Levin]

From: Mark Brown <broonie at kernel.org>

[ Upstream commit a7786cbae4b2732815da98efa39df96746b5bd0d ]

The slimbus mux put operation unconditionally reports a change in value
which means that spurious events are generated. Fix this by exiting early
in that case.

Signed-off-by: Mark Brown <broonie at kernel.org>
Link: https://lore.kernel.org/r/20220603124609.4024666-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie at kernel.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 sound/soc/codecs/wcd9335.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/wcd9335.c b/sound/soc/codecs/wcd9335.c
index 12be043ee9a3..aa685980a97b 100644
--- a/sound/soc/codecs/wcd9335.c
+++ b/sound/soc/codecs/wcd9335.c
@@ -1287,6 +1287,9 @@ static int slim_rx_mux_put(struct snd_kcontrol *kc,
 	struct snd_soc_dapm_update *update = NULL;
 	u32 port_id = w->shift;
 
+	if (wcd->rx_port_value[port_id] == ucontrol->value.enumerated.item[0])
+		return 0;
+
 	wcd->rx_port_value[port_id] = ucontrol->value.enumerated.item[0];
 
 	/* Remove channel from any list it's in before adding it to a new one */
-- 
2.35.1