提交 d56b6eb6 编写于 作者: G Grant Likely 提交者: Mark Brown

ASoC/mpc5200: get rid of the appl_ptr tracking nonsense

Sound drivers PCM DMA is supposed to free-run until told to stop
by the trigger callback.  The current code tries to track appl_ptr,
to avoid stale buffer data getting played out at the end of the
data stream.  Unfortunately it also results in race conditions
which can cause the audio to stall.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
上级 8f159d72
...@@ -65,36 +65,6 @@ static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) ...@@ -65,36 +65,6 @@ static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
s->period_next = (s->period_next + 1) % s->runtime->periods; s->period_next = (s->period_next + 1) % s->runtime->periods;
} }
static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
{
if (s->appl_ptr > s->runtime->control->appl_ptr) {
/*
* In this case s->runtime->control->appl_ptr has wrapped around.
* Play the data to the end of the boundary, then wrap our own
* appl_ptr back around.
*/
while (s->appl_ptr < s->runtime->boundary) {
if (bcom_queue_full(s->bcom_task))
return;
s->appl_ptr += s->runtime->period_size;
psc_dma_bcom_enqueue_next_buffer(s);
}
s->appl_ptr -= s->runtime->boundary;
}
while (s->appl_ptr < s->runtime->control->appl_ptr) {
if (bcom_queue_full(s->bcom_task))
return;
s->appl_ptr += s->runtime->period_size;
psc_dma_bcom_enqueue_next_buffer(s);
}
}
/* Bestcomm DMA irq handler */ /* Bestcomm DMA irq handler */
static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream) static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream)
{ {
...@@ -107,8 +77,9 @@ static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream) ...@@ -107,8 +77,9 @@ static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream)
bcom_retrieve_buffer(s->bcom_task, NULL, NULL); bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
s->period_current = (s->period_current+1) % s->runtime->periods; s->period_current = (s->period_current+1) % s->runtime->periods;
psc_dma_bcom_enqueue_next_buffer(s);
} }
psc_dma_bcom_enqueue_tx(s);
spin_unlock(&s->psc_dma->lock); spin_unlock(&s->psc_dma->lock);
/* If the stream is active, then also inform the PCM middle layer /* If the stream is active, then also inform the PCM middle layer
...@@ -182,28 +153,21 @@ static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd) ...@@ -182,28 +153,21 @@ static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
s->period_next = 0; s->period_next = 0;
s->period_current = 0; s->period_current = 0;
s->active = 1; s->active = 1;
/* track appl_ptr so that we have a better chance of detecting
* end of stream and not over running it.
*/
s->runtime = runtime; s->runtime = runtime;
s->appl_ptr = s->runtime->control->appl_ptr -
(runtime->period_size * runtime->periods);
/* Fill up the bestcomm bd queue and enable DMA. /* Fill up the bestcomm bd queue and enable DMA.
* This will begin filling the PSC's fifo. * This will begin filling the PSC's fifo.
*/ */
spin_lock_irqsave(&psc_dma->lock, flags); spin_lock_irqsave(&psc_dma->lock, flags);
if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) { if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
bcom_gen_bd_rx_reset(s->bcom_task); bcom_gen_bd_rx_reset(s->bcom_task);
for (i = 0; i < runtime->periods; i++) else
if (!bcom_queue_full(s->bcom_task))
psc_dma_bcom_enqueue_next_buffer(s);
} else {
bcom_gen_bd_tx_reset(s->bcom_task); bcom_gen_bd_tx_reset(s->bcom_task);
psc_dma_bcom_enqueue_tx(s);
} for (i = 0; i < runtime->periods; i++)
if (!bcom_queue_full(s->bcom_task))
psc_dma_bcom_enqueue_next_buffer(s);
bcom_enable(s->bcom_task); bcom_enable(s->bcom_task);
spin_unlock_irqrestore(&psc_dma->lock, flags); spin_unlock_irqrestore(&psc_dma->lock, flags);
......
...@@ -19,8 +19,6 @@ ...@@ -19,8 +19,6 @@
*/ */
struct psc_dma_stream { struct psc_dma_stream {
struct snd_pcm_runtime *runtime; struct snd_pcm_runtime *runtime;
snd_pcm_uframes_t appl_ptr;
int active; int active;
struct psc_dma *psc_dma; struct psc_dma *psc_dma;
struct bcom_task *bcom_task; struct bcom_task *bcom_task;
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册