diff options
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.c | 15 | ||||
| -rw-r--r-- | sound/soc/davinci/davinci-mcasp.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index 1b0aac9..55e2bf6 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -593,6 +593,10 @@ static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div ACLKRDIV(div - 1), ACLKRDIV_MASK); break; + case 2: /* BCLK/LRCLK ratio */ + dev->bclk_lrclk_ratio = div; + break; + default: return -EINVAL; } @@ -625,6 +629,17 @@ static int davinci_config_channel_size(struct davinci_audio_dev *dev, u32 rotate = (32 - word_length) / 4; u32 mask = (1ULL << word_length) - 1; + /* + * if s BCLK-to-LRCLK ratio has been configured via the set_clkdiv() + * callback, take it into account here. That allows us to for example + * send 32 bits per channel to the codec, while only 16 of them carry + * audio payload. + * The clock ratio is given for a full period of data (both left and + * right channels), so it has to be divided by 2. + */ + if (dev->bclk_lrclk_ratio) + word_length = dev->bclk_lrclk_ratio / 2; + /* mapping of the XSSZ bit-field as described in the datasheet */ fmt = (word_length >> 1) - 1; diff --git a/sound/soc/davinci/davinci-mcasp.h b/sound/soc/davinci/davinci-mcasp.h index d2449a8..0edd3b5 100644 --- a/sound/soc/davinci/davinci-mcasp.h +++ b/sound/soc/davinci/davinci-mcasp.h @@ -38,6 +38,7 @@ struct davinci_audio_dev { u8 num_serializer; u8 *serial_dir; u8 version; + u8 bclk_lrclk_ratio; /* McASP FIFO related */ u8 txnumevt; |