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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Mark Brown <broonie@kernel.org>,
        kernel test robot <lkp@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 140/167] ASoC: wcd938x: Fix event generation for some controls
Date:   Tue, 19 Jul 2022 13:54:32 +0200
Message-Id: <20220719114710.032619335@linuxfoundation.org>
In-Reply-To: <20220719114656.750574879@linuxfoundation.org>
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From: Mark Brown <broonie@kernel.org>

[ Upstream commit 10e7ff0047921e32b919ecee7be706dd33c107f8 ]

Currently wcd938x_*_put() unconditionally report that the value of the
control changed, resulting in spurious events being generated. Return 0 in
that case instead as we should. There is still an issue in the compander
control which is a bit more complex.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20220603122526.3914942-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/codecs/wcd938x.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/codecs/wcd938x.c b/sound/soc/codecs/wcd938x.c
index 4480c118ed5d..8cdc45e669f2 100644
--- a/sound/soc/codecs/wcd938x.c
+++ b/sound/soc/codecs/wcd938x.c
@@ -2517,6 +2517,9 @@ static int wcd938x_tx_mode_put(struct snd_kcontrol *kcontrol,
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	int path = e->shift_l;
 
+	if (wcd938x->tx_mode[path] == ucontrol->value.enumerated.item[0])
+		return 0;
+
 	wcd938x->tx_mode[path] = ucontrol->value.enumerated.item[0];
 
 	return 1;
@@ -2539,6 +2542,9 @@ static int wcd938x_rx_hph_mode_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct wcd938x_priv *wcd938x = snd_soc_component_get_drvdata(component);
 
+	if (wcd938x->hph_mode == ucontrol->value.enumerated.item[0])
+		return 0;
+
 	wcd938x->hph_mode = ucontrol->value.enumerated.item[0];
 
 	return 1;
@@ -2630,6 +2636,9 @@ static int wcd938x_ldoh_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct wcd938x_priv *wcd938x = snd_soc_component_get_drvdata(component);
 
+	if (wcd938x->ldoh == ucontrol->value.integer.value[0])
+		return 0;
+
 	wcd938x->ldoh = ucontrol->value.integer.value[0];
 
 	return 1;
@@ -2652,6 +2661,9 @@ static int wcd938x_bcs_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct wcd938x_priv *wcd938x = snd_soc_component_get_drvdata(component);
 
+	if (wcd938x->bcs_dis == ucontrol->value.integer.value[0])
+		return 0;
+
 	wcd938x->bcs_dis = ucontrol->value.integer.value[0];
 
 	return 1;
-- 
2.35.1