[alsa-devel] Applied "ASoC: SOF: control: return true when kcontrol values change" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: control: return true when kcontrol values change

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.4

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 95a32c98055f664f9b3f34c41e153d4dcedd0eff Mon Sep 17 00:00:00 2001
From: Dragos Tarcatu <dragos_tarcatu at mentor.com>
Date: Fri, 18 Oct 2019 07:38:06 -0500
Subject: [PATCH] ASoC: SOF: control: return true when kcontrol values change

All the kcontrol put() functions are currently returning 0 when
successful. This does not go well with alsamixer as it does
not seem to get notified on SND_CTL_EVENT_MASK_VALUE callbacks
when values change for (some of) the sof kcontrols.
This patch fixes that by returning true for volume, switch
and enum type kcontrols when values do change in put().

Signed-off-by: Dragos Tarcatu <dragos_tarcatu at mentor.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Link: https://lore.kernel.org/r/20191018123806.18063-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/sof/control.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index a4983f90ff5b..2b8711eda362 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -60,13 +60,16 @@ int snd_sof_volume_put(struct snd_kcontrol *kcontrol,
 	struct snd_sof_dev *sdev = scontrol->sdev;
 	struct sof_ipc_ctrl_data *cdata = scontrol->control_data;
 	unsigned int i, channels = scontrol->num_channels;
+	bool change = false;
+	u32 value;
 
 	/* update each channel */
 	for (i = 0; i < channels; i++) {
-		cdata->chanv[i].value =
-			mixer_to_ipc(ucontrol->value.integer.value[i],
+		value = mixer_to_ipc(ucontrol->value.integer.value[i],
 				     scontrol->volume_table, sm->max + 1);
+		change = change || (value != cdata->chanv[i].value);
 		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = value;
 	}
 
 	/* notify DSP of mixer updates */
@@ -76,8 +79,7 @@ int snd_sof_volume_put(struct snd_kcontrol *kcontrol,
 					      SOF_CTRL_TYPE_VALUE_CHAN_GET,
 					      SOF_CTRL_CMD_VOLUME,
 					      true);
-
-	return 0;
+	return change;
 }
 
 int snd_sof_switch_get(struct snd_kcontrol *kcontrol,
@@ -105,11 +107,15 @@ int snd_sof_switch_put(struct snd_kcontrol *kcontrol,
 	struct snd_sof_dev *sdev = scontrol->sdev;
 	struct sof_ipc_ctrl_data *cdata = scontrol->control_data;
 	unsigned int i, channels = scontrol->num_channels;
+	bool change = false;
+	u32 value;
 
 	/* update each channel */
 	for (i = 0; i < channels; i++) {
-		cdata->chanv[i].value = ucontrol->value.integer.value[i];
+		value = ucontrol->value.integer.value[i];
+		change = change || (value != cdata->chanv[i].value);
 		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = value;
 	}
 
 	/* notify DSP of mixer updates */
@@ -120,7 +126,7 @@ int snd_sof_switch_put(struct snd_kcontrol *kcontrol,
 					      SOF_CTRL_CMD_SWITCH,
 					      true);
 
-	return 0;
+	return change;
 }
 
 int snd_sof_enum_get(struct snd_kcontrol *kcontrol,
@@ -148,11 +154,15 @@ int snd_sof_enum_put(struct snd_kcontrol *kcontrol,
 	struct snd_sof_dev *sdev = scontrol->sdev;
 	struct sof_ipc_ctrl_data *cdata = scontrol->control_data;
 	unsigned int i, channels = scontrol->num_channels;
+	bool change = false;
+	u32 value;
 
 	/* update each channel */
 	for (i = 0; i < channels; i++) {
-		cdata->chanv[i].value = ucontrol->value.enumerated.item[i];
+		value = ucontrol->value.enumerated.item[i];
+		change = change || (value != cdata->chanv[i].value);
 		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = value;
 	}
 
 	/* notify DSP of enum updates */
@@ -163,7 +173,7 @@ int snd_sof_enum_put(struct snd_kcontrol *kcontrol,
 					      SOF_CTRL_CMD_ENUM,
 					      true);
 
-	return 0;
+	return change;
 }
 
 int snd_sof_bytes_get(struct snd_kcontrol *kcontrol,
-- 
2.20.1