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authorMichal Bachraty <michal.bachraty@streamunlimited.com>2013-04-19 15:28:44 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-23 14:50:30 +0100
commitd486fea6babfe3ff0c382c9e4baf18f535fcee7d (patch)
treeebe7a30d63d4f26389c928b0f5bc271ff1a085a3 /sound
parent7c21a78104d7f2c155e2c12279282f659d773d05 (diff)
downloadop-kernel-dev-d486fea6babfe3ff0c382c9e4baf18f535fcee7d.zip
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ASoC: davinci-mcasp: Add Support BCLK-to-LRCLK ratio for TDM modes
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.bachraty@streamunlimited.com> Acked-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/davinci/davinci-mcasp.c7
-rw-r--r--sound/soc/davinci/davinci-mcasp.h2
2 files changed, 5 insertions, 4 deletions
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 5914337..8b85049 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;
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