[PATCHv2 5/5] ASoC: OMAP3: Report delay caused by the internal FIFO

Peter Ujfalusi
2010-03-03T13:08:09Z

Use the new delay calback function to report the delay through
ALSA for application caused by the internal FIFO.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
---
sound/soc/omap/omap-mcbsp.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index e814a95..2952fb0 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -256,6 +256,31 @@ static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
return err;
}

+static snd_pcm_sframes_t omap_mcbsp_dai_delay(
+ struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+ struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
+ u16 fifo_use;
+ snd_pcm_sframes_t delay;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ fifo_use = omap_mcbsp_get_tx_delay(mcbsp_data->bus_id);
+ else
+ fifo_use = omap_mcbsp_get_rx_delay(mcbsp_data->bus_id);
+
+ /*
+ * Divide the used locations with the channel count to get the
+ * FIFO usage in samples (don't care about partial samples in the
+ * buffer).
+ */
+ delay = fifo_use / substream->runtime->channels;
+
+ return delay;
+}
+
static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
@@ -607,6 +632,7 @@ static struct snd_soc_dai_ops omap_mcbsp_dai_ops = {
.startup = omap_mcbsp_dai_startup,
.shutdown = omap_mcbsp_dai_shutdown,
.trigger = omap_mcbsp_dai_trigger,
+ .delay = omap_mcbsp_dai_delay,
.hw_params = omap_mcbsp_dai_hw_params,
.set_fmt = omap_mcbsp_dai_set_dai_fmt,
.set_clkdiv = omap_mcbsp_dai_set_clkdiv,
--
1.7.0