From 8db78ace1ba897302131422ce15c5eb04510cef8 Mon Sep 17 00:00:00 2001
From: Sameer Pujar <spujar@nvidia.com>
Date: Thu, 18 Nov 2021 12:37:09 +0530
Subject: [PATCH] ASoC: tegra: Fix kcontrol put callback in AMX
Git-commit: 8db78ace1ba897302131422ce15c5eb04510cef8
Patch-mainline: v5.16-rc4
References: git-fixes
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 AMX driver.
Fixes: 77f7df346c45 ("ASoC: tegra: Add Tegra210 based AMX driver")
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Suggested-by: Jaroslav Kysela <perex@perex.cz>
Suggested-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/1637219231-406-15-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
sound/soc/tegra/tegra210_amx.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/soc/tegra/tegra210_amx.c b/sound/soc/tegra/tegra210_amx.c
index af9bddfc3120..689576302ede 100644
--- a/sound/soc/tegra/tegra210_amx.c
+++ b/sound/soc/tegra/tegra210_amx.c
@@ -222,6 +222,9 @@ static int tegra210_amx_put_byte_map(struct snd_kcontrol *kcontrol,
int reg = mc->reg;
int value = ucontrol->value.integer.value[0];
+ if (value == bytes_map[reg])
+ return 0;
+
if (value >= 0 && value <= 255) {
/* Update byte map and enable slot */
bytes_map[reg] = value;
--
2.31.1