linux-kernel - [PATCH AUTOSEL 5.15 32/42] ASoC: cs47l92: Fix event generation for OUT1 demux

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Message-Id: <20220720011350.1024134-32-sashal@kernel.org>
Date:   Tue, 19 Jul 2022 21:13:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, james.schulman@...rus.com,
        david.rhodes@...rus.com, tanureal@...nsource.cirrus.com,
        rf@...nsource.cirrus.com, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        patches@...nsource.cirrus.com
Subject: [PATCH AUTOSEL 5.15 32/42] ASoC: cs47l92: Fix event generation for OUT1 demux

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

[ Upstream commit 870d72ab9228575b2f005c9a23ea08787e0f63e6 ]

cs47l92_put_demux returns the value of snd_soc_dapm_mux_update_power,
which returns a 1 if a path was found for the kcontrol. This is
obviously different to the expected return a 1 if the control
was updated value. This results in spurious notifications to
user-space. Update the handling to only return a 1 when the value is
changed.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Link: https://lore.kernel.org/r/20220628153409.3266932-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/cs47l92.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs47l92.c b/sound/soc/codecs/cs47l92.c
index 1a0280416d92..ad6f41741372 100644
--- a/sound/soc/codecs/cs47l92.c
+++ b/sound/soc/codecs/cs47l92.c
@@ -119,7 +119,13 @@ static int cs47l92_put_demux(struct snd_kcontrol *kcontrol,
 end:
 	snd_soc_dapm_mutex_unlock(dapm);
 
-	return snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);
+	ret = snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);
+	if (ret < 0) {
+		dev_err(madera->dev, "Failed to update demux power state: %d\n", ret);
+		return ret;
+	}
+
+	return change;
 }
 
 static SOC_ENUM_SINGLE_DECL(cs47l92_outdemux_enum,
-- 
2.35.1