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From:   Charles Keepax <ckeepax@opensource.cirrus.com>
To:     <broonie@kernel.org>
CC:     <james.schulman@cirrus.com>, <david.rhodes@cirrus.com>,
        <lgirdwood@gmail.com>, <alsa-devel@alsa-project.org>,
        <patches@opensource.cirrus.com>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 5/6] ASoC: madera: Fix event generation for rate controls
Date:   Thu, 23 Jun 2022 11:51:19 +0100
Message-ID: <20220623105120.1981154-5-ckeepax@opensource.cirrus.com>
In-Reply-To: <20220623105120.1981154-1-ckeepax@opensource.cirrus.com>
References: <20220623105120.1981154-1-ckeepax@opensource.cirrus.com>
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madera_adsp_rate_put always returns zero regardless of if the control
value was updated. This results in missing notifications to user-space
of the control change. Update the handling to return 1 when the
value is changed.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/madera.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/madera.c b/sound/soc/codecs/madera.c
index 8095a87117cf8..b9f19fbd29114 100644
--- a/sound/soc/codecs/madera.c
+++ b/sound/soc/codecs/madera.c
@@ -899,7 +899,7 @@ static int madera_adsp_rate_put(struct snd_kcontrol *kcontrol,
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	const int adsp_num = e->shift_l;
 	const unsigned int item = ucontrol->value.enumerated.item[0];
-	int ret;
+	int ret = 0;
 
 	if (item >= e->items)
 		return -EINVAL;
@@ -916,10 +916,10 @@ static int madera_adsp_rate_put(struct snd_kcontrol *kcontrol,
 			 "Cannot change '%s' while in use by active audio paths\n",
 			 kcontrol->id.name);
 		ret = -EBUSY;
-	} else {
+	} else if (priv->adsp_rate_cache[adsp_num] != e->values[item]) {
 		/* Volatile register so defer until the codec is powered up */
 		priv->adsp_rate_cache[adsp_num] = e->values[item];
-		ret = 0;
+		ret = 1;
 	}
 
 	mutex_unlock(&priv->rate_lock);
-- 
2.30.2