diff options
Diffstat (limited to 'sound/soc')
| -rw-r--r-- | sound/soc/omap/omap-mcbsp.c | 62 |
1 files changed, 56 insertions, 6 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c index 4ac8a08..9fd00b0 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); |
