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ASoC: fsl_esai: Add spin lock to protect reset, stop and start 

xrun may happen at the end of stream, the
trigger->fsl_esai_trigger_stop maybe called in the middle of
fsl_esai_hw_reset, this may cause esai in wrong state
after stop, and there may be endless xrun interrupt.

This issue may also happen with trigger->fsl_esai_trigger_start.

So Add spin lock to lock those functions.

Fixes: 7ccafa2b38 ("ASoC: fsl_esai: recover the channel swap after xrun")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/52e92c4221a83e39a84a6cd92fc3d5479b44894c.1572252321.git.shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shengjiu Wang 2019-10-28 17:11:05 +08:00 committed by Mark Brown
parent b39eb1e250
commit 35dac62747
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
sound/soc/fsl/fsl_esai.c
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@ -33,6 +33,7 @@
* @fsysclk: system clock source to derive HCK, SCK and FS
* @spbaclk: SPBA clock (optional, depending on SoC design)
* @task: tasklet to handle the reset operation
* @lock: spin lock between hw_reset() and trigger()
* @fifo_depth: depth of tx/rx FIFO
* @slot_width: width of each DAI slot
* @slots: number of slots
@ -56,6 +57,7 @@ struct fsl_esai {
struct clk *fsysclk;
struct clk *spbaclk;
struct tasklet_struct task;
spinlock_t lock; /* Protect hw_reset and trigger */
u32 fifo_depth;
u32 slot_width;
u32 slots;
@ -676,8 +678,10 @@ static void fsl_esai_hw_reset(unsigned long arg)
{
struct fsl_esai *esai_priv = (struct fsl_esai *)arg;
bool tx = true, rx = false, enabled[2];
unsigned long lock_flags;
u32 tfcr, rfcr;
spin_lock_irqsave(&esai_priv->lock, lock_flags);
/* Save the registers */
regmap_read(esai_priv->regmap, REG_ESAI_TFCR, &tfcr);
regmap_read(esai_priv->regmap, REG_ESAI_RFCR, &rfcr);
@ -715,6 +719,8 @@ static void fsl_esai_hw_reset(unsigned long arg)
fsl_esai_trigger_start(esai_priv, tx);
if (enabled[rx])
fsl_esai_trigger_start(esai_priv, rx);
spin_unlock_irqrestore(&esai_priv->lock, lock_flags);
}
static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
@ -722,6 +728,7 @@ static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
{
struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
unsigned long lock_flags;
esai_priv->channels[tx] = substream->runtime->channels;
@ -729,12 +736,16 @@ static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock_irqsave(&esai_priv->lock, lock_flags);
fsl_esai_trigger_start(esai_priv, tx);
spin_unlock_irqrestore(&esai_priv->lock, lock_flags);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(&esai_priv->lock, lock_flags);
fsl_esai_trigger_stop(esai_priv, tx);
spin_unlock_irqrestore(&esai_priv->lock, lock_flags);
break;
default:
return -EINVAL;
@ -1002,6 +1013,7 @@ static int fsl_esai_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, esai_priv);
spin_lock_init(&esai_priv->lock);
ret = fsl_esai_hw_init(esai_priv);
if (ret)
return ret;