diff options
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 10ae75e..a9822c7 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -629,13 +629,29 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream, return 0; } -static int mcasp_i2s_hw_param(struct davinci_mcasp *mcasp, int stream) +static int mcasp_i2s_hw_param(struct davinci_mcasp *mcasp, int stream, + int channels) { int i, active_slots; + int total_slots; + int active_serializers; u32 mask = 0; u32 busel = 0; - active_slots = mcasp->tdm_slots; + total_slots = mcasp->tdm_slots; + + /* + * If more than one serializer is needed, then use them with + * their specified tdm_slots count. Otherwise, one serializer + * can cope with the transaction using as many slots as channels + * in the stream, requires channels symmetry + */ + active_serializers = (channels + total_slots - 1) / total_slots; + if (active_serializers == 1) + active_slots = channels; + else + active_slots = total_slots; + for (i = 0; i < active_slots; i++) mask |= (1 << i); @@ -647,12 +663,12 @@ static int mcasp_i2s_hw_param(struct davinci_mcasp *mcasp, int stream) mcasp_set_reg(mcasp, DAVINCI_MCASP_TXTDM_REG, mask); mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, busel | TXORD); mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, - FSXMOD(active_slots), FSXMOD(0x1FF)); + FSXMOD(total_slots), FSXMOD(0x1FF)); mcasp_set_reg(mcasp, DAVINCI_MCASP_RXTDM_REG, mask); mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, busel | RXORD); mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, - FSRMOD(active_slots), FSRMOD(0x1FF)); + FSRMOD(total_slots), FSRMOD(0x1FF)); return 0; } @@ -766,7 +782,8 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream, if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE) ret = mcasp_dit_hw_param(mcasp, params_rate(params)); else - ret = mcasp_i2s_hw_param(mcasp, substream->stream); + ret = mcasp_i2s_hw_param(mcasp, substream->stream, + channels); if (ret) return ret; |
