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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>
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@ -636,11 +636,12 @@ static int davinci_config_channel_size(struct davinci_audio_dev *dev,
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* callback, take it into account here. That allows us to for example
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* send 32 bits per channel to the codec, while only 16 of them carry
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* audio payload.
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* The clock ratio is given for a full period of data (both left and
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* right channels), so it has to be divided by 2.
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* The clock ratio is given for a full period of data (for I2S format
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* both left and right channels), so it has to be divided by number of
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* tdm-slots (for I2S - divided by 2).
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*/
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if (dev->bclk_lrclk_ratio)
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word_length = dev->bclk_lrclk_ratio / 2;
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word_length = dev->bclk_lrclk_ratio / dev->tdm_slots;
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/* mapping of the XSSZ bit-field as described in the datasheet */
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fmt = (word_length >> 1) - 1;
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@ -38,7 +38,7 @@ struct davinci_audio_dev {
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u8 num_serializer;
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u8 *serial_dir;
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u8 version;
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u8 bclk_lrclk_ratio;
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u16 bclk_lrclk_ratio;
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/* McASP FIFO related */
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u8 txnumevt;
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