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authorPeter Ujfalusi <peter.ujfalusi@nokia.com>2010-07-29 09:51:27 +0300
committerLiam Girdwood <lrg@slimlogic.co.uk>2010-08-02 10:38:16 +0100
commitcf80e15860852be5ce38714979db94ec36c5e288 (patch)
treed2acef3fa3efb715416f6ac3bc0703080e584791
parent15d0143007b68079aec02918d890c26ed4eaf3b9 (diff)
ASoC: omap-mcbsp: Support for sDMA packet mode
Utilize the sDMA controller's packet syncronization mode, when the McBSP FIFO is in use (by extending the THRESHOLD mode). When the sDMA is configured for packet mode, the sDMA frame size does not need to match with the McBSP threshold configuration. Uppon DMA request the sDMA will transfer packet size number of words, and still trigger interrupt on frame boundary. The patch extends the original THRESHOLD mode by doing the following: if (period_words <= max_threshold) Current THRESHOLD mode configuration Otherwise (period_words > max_threshold) McBSP threshold = sDMA packet size sDMA frame size = period size With the extended THRESHOLD mode we can remove the constraint for the maximum period size, since if the period size is bigger than the maximum allowed threshold, than the driver will switch to packet mode, and picks the best (biggest) threshold value, which can divide evenly the period size. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com> Acked-by: Jarkko Nikula <jhnikula@gmail.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
-rw-r--r--sound/soc/omap/omap-mcbsp.c62
1 files changed, 56 insertions, 6 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 4ac8a08db7b..9fd00b09181 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -155,13 +155,23 @@ static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
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);
+ struct omap_pcm_dma_data *dma_data;
int dma_op_mode = omap_mcbsp_get_dma_op_mode(mcbsp_data->bus_id);
int words;
+ dma_data = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
+
/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
- /* The FIFO size depends on the McBSP word configuration */
- words = snd_pcm_lib_period_bytes(substream) /
+ /*
+ * 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_data->wlen / 8);
else
words = 1;
@@ -351,6 +361,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
struct omap_pcm_dma_data *dma_data;
int dma, bus_id = mcbsp_data->bus_id;
int wlen, channels, wpf, sync_mode = OMAP_DMA_SYNC_ELEMENT;
+ int pkt_size = 0;
unsigned long port;
unsigned int format, div, framesize, master;
@@ -373,9 +384,11 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
dma_data->data_type = OMAP_DMA_DATA_TYPE_S16;
+ wlen = 16;
break;
case SNDRV_PCM_FORMAT_S32_LE:
dma_data->data_type = OMAP_DMA_DATA_TYPE_S32;
+ wlen = 32;
break;
default:
return -EINVAL;
@@ -384,14 +397,53 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
dma_data->set_threshold = omap_mcbsp_set_threshold;
/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
if (omap_mcbsp_get_dma_op_mode(bus_id) ==
- MCBSP_DMA_MODE_THRESHOLD)
- sync_mode = OMAP_DMA_SYNC_FRAME;
+ MCBSP_DMA_MODE_THRESHOLD) {
+ int period_words, max_thrsh;
+
+ period_words = params_period_bytes(params) / (wlen / 8);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ max_thrsh = omap_mcbsp_get_max_tx_threshold(
+ mcbsp_data->bus_id);
+ else
+ max_thrsh = omap_mcbsp_get_max_rx_threshold(
+ mcbsp_data->bus_id);
+ /*
+ * 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
+ */
+ 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;
+ }
+ }
}
dma_data->name = substream->stream ? "Audio Capture" : "Audio Playback";
dma_data->dma_req = dma;
dma_data->port_addr = port;
dma_data->sync_mode = sync_mode;
+ dma_data->packet_size = pkt_size;
snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
@@ -419,7 +471,6 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
/* Set word lengths */
- wlen = 16;
regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_16);
regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_16);
regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_16);
@@ -427,7 +478,6 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
break;
case SNDRV_PCM_FORMAT_S32_LE:
/* Set word lengths */
- wlen = 32;
regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_32);
regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_32);
regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_32);