ASoC: tegra: Fix kcontrol put callback in AHUB

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. Update
the AHUB driver accordingly.

Fixes: ca500914d1f6 ("ASoC: tegra: Add Tegra210 based AHUB 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/1637219231-406-12-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/tegra/tegra210_ahub.c b/sound/soc/tegra/tegra210_ahub.c
index a1989eae2b525ad818245c56c588b8da0aa55997..388b815443c7d1dff33617667a592e91ab176153 100644 (file)
--- a/sound/soc/tegra/tegra210_ahub.c
+++ b/sound/soc/tegra/tegra210_ahub.c
@@ -62,6 +62,7 @@ static int tegra_ahub_put_value_enum(struct snd_kcontrol *kctl,
        unsigned int *item = uctl->value.enumerated.item;
        unsigned int value = e->values[item[0]];
        unsigned int i, bit_pos, reg_idx = 0, reg_val = 0;
+       int change = 0;
 
        if (item[0] >= e->items)
                return -EINVAL;
@@ -86,12 +87,14 @@ static int tegra_ahub_put_value_enum(struct snd_kcontrol *kctl,
 
                /* Update widget power if state has changed */
                if (snd_soc_component_test_bits(cmpnt, update[i].reg,
-                                               update[i].mask, update[i].val))
-                       snd_soc_dapm_mux_update_power(dapm, kctl, item[0], e,
-                                                     &update[i]);
+                                               update[i].mask,
+                                               update[i].val))
+                       change |= snd_soc_dapm_mux_update_power(dapm, kctl,
+                                                               item[0], e,
+                                                               &update[i]);
        }
 
-       return 0;
+       return change;
 }
 
 static struct snd_soc_dai_driver tegra210_ahub_dais[] = {