[PATCH 6.18 040/309] ASoC: fsl_easrc: Fix event generation in fsl_easrc_iec958_set_reg()

Greg Kroah-Hartman
2026-03-31T16:58:20Z

From: Mark Brown <broonie@kernel.org>

[ Upstream commit 31ddc62c1cd92e51b9db61d7954b85ae2ec224da ]

ALSA controls should return 1 if the value in the control changed but the
control put operation fsl_easrc_set_reg() only returns 0 or a negative
error code, causing ALSA to not generate any change events. Add a suitable
check by using regmap_update_bits_check() with the underlying regmap, this
is more clearly and simply correct than trying to verify that one of the
generic ops is exactly equivalent to this one.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20260205-asoc-fsl-easrc-fix-events-v1-2-39d4c766918b@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/fsl/fsl_easrc.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
index f404a39009e1a..ec49da2d1ebb2 100644
--- a/sound/soc/fsl/fsl_easrc.c
+++ b/sound/soc/fsl/fsl_easrc.c
@@ -93,14 +93,17 @@ static int fsl_easrc_set_reg(struct snd_kcontrol *kcontrol,
struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
struct soc_mreg_control *mc =
(struct soc_mreg_control *)kcontrol->private_value;
+ struct fsl_asrc *easrc = snd_soc_component_get_drvdata(component);
unsigned int regval = ucontrol->value.integer.value[0];
+ bool changed;
int ret;

- ret = snd_soc_component_write(component, mc->regbase, regval);
- if (ret < 0)
+ ret = regmap_update_bits_check(easrc->regmap, mc->regbase,
+ GENMASK(31, 0), regval, &changed);
+ if (ret != 0)
return ret;

- return 0;
+ return changed;
}

#define SOC_SINGLE_REG_RW(xname, xreg) \
--
2.51.0