ALSA controls should return 1 from a put callback when the control
value changes. fsl_xcvr_capds_put() and fsl_xcvr_tx_cs_put() both
update cached control data but always return 0, so ALSA suppresses
change notifications for the Capabilities Data Structure and playback
IEC958 channel status controls.

Compare the old and new cached values before copying the new data,
and return whether the control value changed.

Fixes: 28564486866f ("ASoC: fsl_xcvr: Add XCVR ASoC CPU DAI driver")
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
---
 sound/soc/fsl/fsl_xcvr.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index ee16cf681488..6677d3bf36ec 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -228,10 +228,14 @@ static int fsl_xcvr_capds_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
 	struct fsl_xcvr *xcvr = snd_soc_dai_get_drvdata(dai);
+	int changed;
 
-	memcpy(xcvr->cap_ds, ucontrol->value.bytes.data, FSL_XCVR_CAPDS_SIZE);
+	changed = memcmp(xcvr->cap_ds, ucontrol->value.bytes.data,
+			 sizeof(xcvr->cap_ds)) != 0;
+	memcpy(xcvr->cap_ds, ucontrol->value.bytes.data,
+	       sizeof(xcvr->cap_ds));
 
-	return 0;
+	return changed;
 }
 
 static struct snd_kcontrol_new fsl_xcvr_earc_capds_kctl = {
@@ -1040,10 +1044,15 @@ static int fsl_xcvr_tx_cs_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
 	struct fsl_xcvr *xcvr = snd_soc_dai_get_drvdata(dai);
+	int changed;
 
-	memcpy(xcvr->tx_iec958.status, ucontrol->value.iec958.status, 24);
+	changed = memcmp(xcvr->tx_iec958.status,
+			 ucontrol->value.iec958.status,
+			 sizeof(xcvr->tx_iec958.status)) != 0;
+	memcpy(xcvr->tx_iec958.status, ucontrol->value.iec958.status,
+	       sizeof(xcvr->tx_iec958.status));
 
-	return 0;
+	return changed;
 }
 
 static struct snd_kcontrol_new fsl_xcvr_rx_ctls[] = {

---
base-commit: 98421d94a1a6dcc3e8582eb62bedeccecda93339
change-id: 20260427-asoc-fsl-xcvr-event-generation-2f57c539de28

Best regards,
--  
Cássio Gabriel <cassiogabrielcontato@gmail.com>

On Tue, 28 Apr 2026 00:07:08 -0300, Cássio Gabriel wrote:
> ASoC: fsl_xcvr: Fix event generation for cached controls

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-7.1

Thanks!

[1/1] ASoC: fsl_xcvr: Fix event generation for cached controls
      https://git.kernel.org/broonie/sound/c/e8446a4a574d

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark