ASoC: tegra: Fix kcontrol put callback in AHUB

BugLink: https://bugs.launchpad.net/bugs/1953731
commit a4e37950c9e9b126f9cbee79b8ab94a94646dcf1 upstream.

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: 16e1bcc2caf4 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/sound/soc/tegra/tegra210_ahub.c b/sound/soc/tegra/tegra210_ahub.c
index 66287a7c9865dc6971c778f90a6f2e438b83d660..1b2f7cb8c6adc2b2168906253c111f6faa74def2 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[] = {