diff options
author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2012-09-14 15:05:49 +0300 |
---|---|---|
committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-09-22 11:12:57 -0400 |
commit | dffb360e64968b95a0a0221ca52234a28cc049c9 (patch) | |
tree | a981e452d1bb634a587fc2d8934d1d8dfaea6c3e /sound/soc/omap | |
parent | 2dde5b909e117cc95a5e31604f9bfd043e78ad9d (diff) | |
download | linux-stable-dffb360e64968b95a0a0221ca52234a28cc049c9.tar.gz linux-stable-dffb360e64968b95a0a0221ca52234a28cc049c9.tar.bz2 linux-stable-dffb360e64968b95a0a0221ca52234a28cc049c9.zip |
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/omap')
-rw-r--r-- | sound/soc/omap/omap-mcbsp.c | 47 |
1 files changed, 17 insertions, 30 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index 2e91a86b6114..fe3debcc2d0b 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; |