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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2012-09-14 15:05:49 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-22 11:12:57 -0400
commitdffb360e64968b95a0a0221ca52234a28cc049c9 (patch)
treea981e452d1bb634a587fc2d8934d1d8dfaea6c3e /sound/soc
parent2dde5b909e117cc95a5e31604f9bfd043e78ad9d (diff)
downloadop-kernel-dev-dffb360e64968b95a0a0221ca52234a28cc049c9.zip
op-kernel-dev-dffb360e64968b95a0a0221ca52234a28cc049c9.tar.gz
ASoC: omap-mcbsp: Use sDMA packet mode instead of frame mode
When McBSP is configured in threshold mode we can use sDMA packet mode in all cases. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/omap/omap-mcbsp.c47
1 files changed, 17 insertions, 30 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 2e91a86..fe3debc 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -81,9 +81,6 @@ static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
*/
if (dma_data->packet_size)
words = dma_data->packet_size;
- else if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
- words = snd_pcm_lib_period_bytes(substream) /
- (mcbsp->wlen / 8);
else
words = 1;
@@ -251,6 +248,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
dma_data->set_threshold = omap_mcbsp_set_threshold;
if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) {
int period_words, max_thrsh;
+ int divider = 0;
period_words = params_period_bytes(params) / (wlen / 8);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
@@ -258,34 +256,23 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
else
max_thrsh = mcbsp->max_rx_thres;
/*
- * If the period contains less or equal number of words,
- * we are using the original threshold mode setup:
- * McBSP threshold = sDMA frame size = period_size
- * Otherwise we switch to sDMA packet mode:
- * McBSP threshold = sDMA packet size
- * sDMA frame size = period size
+ * Use sDMA packet mode if McBSP is in threshold mode:
+ * If period words less than the FIFO size the packet
+ * size is set to the number of period words, otherwise
+ * Look for the biggest threshold value which divides
+ * the period size evenly.
*/
- if (period_words > max_thrsh) {
- int divider = 0;
-
- /*
- * Look for the biggest threshold value, which
- * divides the period size evenly.
- */
- divider = period_words / max_thrsh;
- if (period_words % max_thrsh)
- divider++;
- while (period_words % divider &&
- divider < period_words)
- divider++;
- if (divider == period_words)
- return -EINVAL;
-
- pkt_size = period_words / divider;
- sync_mode = OMAP_DMA_SYNC_PACKET;
- } else {
- sync_mode = OMAP_DMA_SYNC_FRAME;
- }
+ divider = period_words / max_thrsh;
+ if (period_words % max_thrsh)
+ divider++;
+ while (period_words % divider &&
+ divider < period_words)
+ divider++;
+ if (divider == period_words)
+ return -EINVAL;
+
+ pkt_size = period_words / divider;
+ sync_mode = OMAP_DMA_SYNC_PACKET;
} else if (channels > 1) {
/* Use packet mode for non mono streams */
pkt_size = channels;
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