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ASoC: stm32: dfsdm: manage multiple prepare 

The DFSDM must be stopped when a new setting is applied.
restart systematically DFSDM on multiple prepare calls,
to apply changes.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Olivier Moysan 2019-03-04 15:52:43 +01:00 committed by Mark Brown
parent a2bcbc1b9a
commit 19441e35a4
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 16 additions and 1 deletions
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17
sound/soc/stm/stm32_adfsdm.c
View File

@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@ -37,6 +38,8 @@ struct stm32_adfsdm_priv {
/* PCM buffer */
unsigned char *pcm_buff;
unsigned int pos;
struct mutex lock; /* protect against race condition on iio state */
};
static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = {
@ -62,10 +65,12 @@ static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream,
{
struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
mutex_lock(&priv->lock);
if (priv->iio_active) {
iio_channel_stop_all_cb(priv->iio_cb);
priv->iio_active = false;
}
mutex_unlock(&priv->lock);
}
static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
@ -74,13 +79,19 @@ static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
int ret;
mutex_lock(&priv->lock);
if (priv->iio_active) {
iio_channel_stop_all_cb(priv->iio_cb);
priv->iio_active = false;
}
ret = iio_write_channel_attribute(priv->iio_ch,
substream->runtime->rate, 0,
IIO_CHAN_INFO_SAMP_FREQ);
if (ret < 0) {
dev_err(dai->dev, "%s: Failed to set %d sampling rate\n",
__func__, substream->runtime->rate);
return ret;
goto out;
}
if (!priv->iio_active) {
@ -92,6 +103,9 @@ static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
__func__, ret);
}
out:
mutex_unlock(&priv->lock);
return ret;
}
@ -299,6 +313,7 @@ static int stm32_adfsdm_probe(struct platform_device *pdev)
priv->dev = &pdev->dev;
priv->dai_drv = stm32_adfsdm_dai;
mutex_init(&priv->lock);
dev_set_drvdata(&pdev->dev, priv);