From d486fea6babfe3ff0c382c9e4baf18f535fcee7d Mon Sep 17 00:00:00 2001
From: Michal Bachraty <michal.bachraty@streamunlimited.com>
Date: Fri, 19 Apr 2013 15:28:44 +0200
Subject: [PATCH] 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>
---
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 59143373afc6e..8b85049daab08 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 0edd3b5a37fd8..a9ac0c11da71d 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;
--
2.30.2