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ASoC: omap-mcbsp: Use DMA packet mode for non mono streams on OMAP3+ 

Take the DMA packet mode into use when the McBSP is configured in element
dma_op_mode if the stream is not mono.
In this way we transfer one sample from/to McBSP FIFO upon DMA request.
This change only affects OMAP3+ versions, where the McBSP ports have FIFO.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>
This commit is contained in:
Peter Ujfalusi 2012-03-15 12:20:32 +02:00 committed by Liam Girdwood
parent 766812e6d5
commit 778a17c31f
1 changed files with 17 additions and 13 deletions
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30
sound/soc/omap/omap-mcbsp.c
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@ -71,18 +71,17 @@ static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
/*
* Configure McBSP threshold based on either:
* packet_size, when the sDMA is in packet mode, or
* based on the period size.
*/
if (dma_data->packet_size)
words = dma_data->packet_size;
else
words = snd_pcm_lib_period_bytes(substream) /
(mcbsp->wlen / 8);
/*
* Configure McBSP threshold based on either:
* packet_size, when the sDMA is in packet mode, or based on the
* period size in THRESHOLD mode, otherwise use McBSP threshold = 1
* for mono streams.
*/
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;
@ -230,6 +229,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
unsigned int format, div, framesize, master;
dma_data = &mcbsp->dma_data[substream->stream];
channels = params_channels(params);
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
@ -283,6 +283,10 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
} else {
sync_mode = OMAP_DMA_SYNC_FRAME;
}
} else if (channels > 1) {
/* Use packet mode for non mono streams */
pkt_size = channels;
sync_mode = OMAP_DMA_SYNC_PACKET;
}
}
@ -301,7 +305,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
regs->rcr1 &= ~(RFRLEN1(0x7f) | RWDLEN1(7));
regs->xcr1 &= ~(XFRLEN1(0x7f) | XWDLEN1(7));
format = mcbsp->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
wpf = channels = params_channels(params);
wpf = channels;
if (channels == 2 && (format == SND_SOC_DAIFMT_I2S ||
format == SND_SOC_DAIFMT_LEFT_J)) {
/* Use dual-phase frames */