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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2012-03-15 12:20:32 +0200
committerLiam Girdwood <lrg@ti.com>2012-05-22 17:33:18 +0100
commit778a17c31fc1c0ecc22c9012747d5249ed6db80f (patch)
treed6af1115c4411a29fe677a2a8fb075dd5a3aa492 /sound
parent766812e6d5e2e23be1e212cf84902d5e834dd865 (diff)
downloadop-kernel-dev-778a17c31fc1c0ecc22c9012747d5249ed6db80f.zip
op-kernel-dev-778a17c31fc1c0ecc22c9012747d5249ed6db80f.tar.gz
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/omap/omap-mcbsp.c30
1 files changed, 17 insertions, 13 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 6912ac7..418dc3c 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -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 */
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