From: Olivier Moysan <olivier.moysan@st.com>
To: <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>,
<tiwai@suse.com>, <mcoquelin.stm32@gmail.com>,
<alexandre.torgue@st.com>, <alsa-devel@alsa-project.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-kernel@vger.kernel.org>, <olivier.moysan@st.com>,
<arnaud.pouliquen@st.com>, <benjamin.gaignard@st.com>
Subject: [PATCH 1/3] ASoC: stm32: dfsdm: manage multiple prepare
Date: Mon, 4 Mar 2019 15:52:43 +0100 [thread overview]
Message-ID: <1551711165-28684-2-git-send-email-olivier.moysan@st.com> (raw)
In-Reply-To: <1551711165-28684-1-git-send-email-olivier.moysan@st.com>
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>
---
sound/soc/stm/stm32_adfsdm.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c
index 706ff005234f..71d341b732a4 100644
--- a/sound/soc/stm/stm32_adfsdm.c
+++ b/sound/soc/stm/stm32_adfsdm.c
@@ -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;
}
@@ -298,6 +312,7 @@ 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);
--
2.7.4
next prev parent reply other threads:[~2019-03-04 14:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-04 14:52 [PATCH 0/3] ASoC: stm32: dfsdm: fixes Olivier Moysan
2019-03-04 14:52 ` Olivier Moysan [this message]
2019-03-20 17:29 ` Applied "ASoC: stm32: dfsdm: manage multiple prepare" to the asoc tree Mark Brown
2019-03-04 14:52 ` [PATCH 2/3] ASoC: stm32: dfsdm: fix debugfs warnings on entry creation Olivier Moysan
2019-03-20 17:29 ` Applied "ASoC: stm32: dfsdm: fix debugfs warnings on entry creation" to the asoc tree Mark Brown
2019-03-04 14:52 ` [PATCH 3/3] ASoC: stm32: dfsdm: add mmap support Olivier Moysan
2019-03-20 17:29 ` Applied "ASoC: stm32: dfsdm: add mmap support" to the asoc tree Mark Brown
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