For TDM mode, BCLK-to-LCLK ratio is computed as (tdm_slots) x (word_length).
I2S mode is only subset of TDM mode with specific tdm_slots = 2 channels.
Also bclk_lrclk_ratio can be greater than 255, therefore u16 need to be used.
Signed-off-by: Michal Bachraty <michal.bachr...@streamunlimited.com>
---
sound/soc/davinci/davinci-mcasp.c | 7 ++++---
sound/soc/davinci/davinci-mcasp.h | 2 +-
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/sound/soc/davinci/davinci-mcasp.c
b/sound/soc/davinci/davinci-mcasp.c
index 63633e9..d54e0d9 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -636,11 +636,12 @@ static int davinci_config_channel_size(struct
davinci_audio_dev *dev,
* 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.
+ * The clock ratio is given for a full period of data (for I2S format
+ * both left and right channels), so it has to be divided by number of
+ * tdm-slots (for I2S - divided by 2).
*/
if (dev->bclk_lrclk_ratio)
- word_length = dev->bclk_lrclk_ratio / 2;
+ word_length = dev->bclk_lrclk_ratio / dev->tdm_slots;
/* 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 0edd3b5..a9ac0c1 100644
--- a/sound/soc/davinci/davinci-mcasp.h
+++ b/sound/soc/davinci/davinci-mcasp.h
@@ -38,7 +38,7 @@ struct davinci_audio_dev {
u8 num_serializer;
u8 *serial_dir;
u8 version;
- u8 bclk_lrclk_ratio;
+ u16 bclk_lrclk_ratio;
/* McASP FIFO related */
u8 txnumevt;
--
1.7.9.5
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