[alsa-devel] [PATCH] ASoC: nau8825: automatic BCLK and LRC divde in master mode

[John Hsu]

Provide the automatic 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 at nuvoton.com>
---
 sound/soc/codecs/nau8825.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 4576f98..97fbeba 100644
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -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;
--
2.6.4



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