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From:   Sameer Pujar <spujar@nvidia.com>
To:     <broonie@kernel.org>, <lgirdwood@gmail.com>, <perex@perex.cz>,
        <tiwai@suse.com>
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        <alsa-devel@alsa-project.org>, <linux-tegra@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, Sameer Pujar <spujar@nvidia.com>
Subject: [PATCH v2 01/10] ASoC: tegra: Fix kcontrol put callback in ADMAIF
Date:   Wed, 3 Nov 2021 19:22:17 +0530
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The kcontrol put callback is expected to return 1 when there is change
in HW or when the update is acknowledged by driver. This would ensure
that change notifications are sent to subscribed applications. Update
the ADMAIF driver accordingly

Fixes: f74028e159bb ("ASoC: tegra: Add Tegra210 based ADMAIF driver")
Suggested-by: Jaroslav Kysela <perex@perex.cz>
Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
---
 sound/soc/tegra/tegra210_admaif.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/sound/soc/tegra/tegra210_admaif.c b/sound/soc/tegra/tegra210_admaif.c
index bcccdf3..dc71075 100644
--- a/sound/soc/tegra/tegra210_admaif.c
+++ b/sound/soc/tegra/tegra210_admaif.c
@@ -452,16 +452,29 @@ static int tegra_admaif_put_control(struct snd_kcontrol *kcontrol,
 	struct tegra_admaif *admaif = snd_soc_component_get_drvdata(cmpnt);
 	int value = ucontrol->value.integer.value[0];
 
-	if (strstr(kcontrol->id.name, "Playback Mono To Stereo"))
+	if (strstr(kcontrol->id.name, "Playback Mono To Stereo")) {
+		if (admaif->mono_to_stereo[ADMAIF_TX_PATH][ec->reg] == value)
+			return 0;
+
 		admaif->mono_to_stereo[ADMAIF_TX_PATH][ec->reg] = value;
-	else if (strstr(kcontrol->id.name, "Capture Mono To Stereo"))
+	} else if (strstr(kcontrol->id.name, "Capture Mono To Stereo")) {
+		if (admaif->mono_to_stereo[ADMAIF_RX_PATH][ec->reg] == value)
+			return 0;
+
 		admaif->mono_to_stereo[ADMAIF_RX_PATH][ec->reg] = value;
-	else if (strstr(kcontrol->id.name, "Playback Stereo To Mono"))
+	} else if (strstr(kcontrol->id.name, "Playback Stereo To Mono")) {
+		if (admaif->stereo_to_mono[ADMAIF_TX_PATH][ec->reg] == value)
+			return 0;
+
 		admaif->stereo_to_mono[ADMAIF_TX_PATH][ec->reg] = value;
-	else if (strstr(kcontrol->id.name, "Capture Stereo To Mono"))
+	} else if (strstr(kcontrol->id.name, "Capture Stereo To Mono")) {
+		if (admaif->stereo_to_mono[ADMAIF_RX_PATH][ec->reg] == value)
+			return 0;
+
 		admaif->stereo_to_mono[ADMAIF_RX_PATH][ec->reg] = value;
+	}
 
-	return 0;
+	return 1;
 }
 
 static int tegra_admaif_dai_probe(struct snd_soc_dai *dai)
-- 
2.7.4