ASoC: nau8810: automatic selecting BCLK in I2S master mode

The driver will select correct BCLK automatically according to
BCLK and FS information in I2S master mode.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/nau8810.c b/sound/soc/codecs/nau8810.c
index 39512a78a556c2a0e75a81202e47a26c0eb2bbb1..5d300b790f78ce55e0de9f1690016b9495dfc917 100644 (file)
--- a/sound/soc/codecs/nau8810.c
+++ b/sound/soc/codecs/nau8810.c
@@ -667,6 +667,24 @@ static int nau8810_pcm_hw_params(struct snd_pcm_substream *substream,
        struct snd_soc_component *component = dai->component;
        struct nau8810 *nau8810 = snd_soc_component_get_drvdata(component);
        int val_len = 0, val_rate = 0, ret = 0;
+       unsigned int ctrl_val, bclk_fs, bclk_div;
+
+       /* Select BCLK configuration if the codec as master. */
+       regmap_read(nau8810->regmap, NAU8810_REG_CLOCK, &ctrl_val);
+       if (ctrl_val & NAU8810_CLKIO_MASTER) {
+               /* get the bclk and fs ratio */
+               bclk_fs = snd_soc_params_to_bclk(params) / params_rate(params);
+               if (bclk_fs <= 32)
+                       bclk_div = NAU8810_BCLKDIV_8;
+               else if (bclk_fs <= 64)
+                       bclk_div = NAU8810_BCLKDIV_4;
+               else if (bclk_fs <= 128)
+                       bclk_div = NAU8810_BCLKDIV_2;
+               else
+                       return -EINVAL;
+               regmap_update_bits(nau8810->regmap, NAU8810_REG_CLOCK,
+                       NAU8810_BCLKSEL_MASK, bclk_div);
+       }
 
        switch (params_width(params)) {
        case 16: