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ASoC: nau8825: automatic BCLK and LRC divde in master mode

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configurable LRC and BCLK divide. The driver
will make configurations of LRC and BCLK automatically according to
BCLK and FS information in master mode.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
John Hsu 2017-02-17 09:55:33 +08:00 committed by Mark Brown
parent 566cf877a1
commit 1e561f6166
1 changed files with 19 additions and 1 deletions
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20
sound/soc/codecs/nau8825.c
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@ -1231,7 +1231,7 @@ static int nau8825_hw_params(struct snd_pcm_substream *substream,
{
struct snd_soc_codec *codec = dai->codec;
struct nau8825 *nau8825 = snd_soc_codec_get_drvdata(codec);
unsigned int val_len = 0, osr;
unsigned int val_len = 0, osr, ctrl_val, bclk_fs, bclk_div;
nau8825_sema_acquire(nau8825, 3 * HZ);
@ -1261,6 +1261,24 @@ static int nau8825_hw_params(struct snd_pcm_substream *substream,
osr_adc_sel[osr].clk_src << NAU8825_CLK_ADC_SRC_SFT);
}
/* make BCLK and LRC divde configuration if the codec as master. */
regmap_read(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2, &ctrl_val);
if (ctrl_val & NAU8825_I2S_MS_MASTER) {
/* get the bclk and fs ratio */
bclk_fs = snd_soc_params_to_bclk(params) / params_rate(params);
if (bclk_fs <= 32)
bclk_div = 2;
else if (bclk_fs <= 64)
bclk_div = 1;
else if (bclk_fs <= 128)
bclk_div = 0;
else
return -EINVAL;
regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
NAU8825_I2S_LRC_DIV_MASK | NAU8825_I2S_BLK_DIV_MASK,
((bclk_div + 1) << NAU8825_I2S_LRC_DIV_SFT) | bclk_div);
}
switch (params_width(params)) {
case 16:
val_len |= NAU8825_I2S_DL_16;