diff mbox series

[v3,15/16] ASoC: tegra: Fix kcontrol put callback in ADX

Message ID 1637219231-406-16-git-send-email-spujar@nvidia.com (mailing list archive)
State Accepted
Commit 3c97881b8c8a2aa8afd4d7a379b7ff03884c9e4a
Headers show
Series Kcontrol get/put cleanup in Tegra drivers | expand

Commit Message

Sameer Pujar Nov. 18, 2021, 7:07 a.m. UTC 
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. Filter
out duplicate updates in ADX driver.

Fixes: a99ab6f395a9 ("ASoC: tegra: Add Tegra210 based ADX driver")
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Suggested-by: Jaroslav Kysela <perex@perex.cz>
Suggested-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/tegra/tegra210_adx.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/sound/soc/tegra/tegra210_adx.c b/sound/soc/tegra/tegra210_adx.c
index d7c7849..933c450 100644
--- a/sound/soc/tegra/tegra210_adx.c
+++ b/sound/soc/tegra/tegra210_adx.c
@@ -193,6 +193,9 @@  static int tegra210_adx_put_byte_map(struct snd_kcontrol *kcontrol,
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;;
 
+	if (value == bytes_map[mc->reg])
+		return 0;
+
 	if (value >= 0 && value <= 255) {
 		/* update byte map and enable slot */
 		bytes_map[mc->reg] = value;