[PATCH 2/2] ASoC: adau1372: fix invalid default state of output ASRC and DAC muxes

[Alvin Šipraga]

The chip has strange power-on reset values for the registers that
control the output ASRC and DAC source muxes - the values are actually
marked "Reserved" in the datasheet [1]. This means that until the
underlying kcontrols are modified, the codec will not function as
expected.

The registers in question are:

  register / field       reset value       valid values

  ASRCO_SOURCE_0_1       0x10
   ASRC_OUT_SOURCE0      0                 4 .. 16
   ASRC_OUT_SOURCE1      1                 4 .. 16
  ASRCO_SOURCE_2_3       0x10
   ASRC_OUT_SOURCE2      2                 4 .. 16
   ASRC_OUT_SOURCE3      3                 4 .. 16
  DAC_SOURCE_0_1         0x10
   DAC_SOURCE_0          0                 12 .. 13
   DAC_SOURCE_1          1                 12 .. 13

Set some sane defaults during the driver probe:

  ADC Decimator0 -> Output ASRC0
  ADC Decimator1 -> Output ASRC1
  ADC Decimator2 -> Output ASRC2
  ADC Decimator3 -> Output ASRC3
  Input ASRC0 -> DAC0
  Input ASRC1 -> DAC1

With this, the chip will behave as advertised by the default kcontrol
state exposed by the driver.

[1] https://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1372.pdf

Fixes: 6cd4c6459e47 ("ASoC: Add ADAU1372 audio CODEC support")
Signed-off-by: Alvin Šipraga <alvin.sipraga@xxxxxxxxxx>
---
 sound/soc/codecs/adau1372.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/codecs/adau1372.c b/sound/soc/codecs/adau1372.c
index b84495371b0b..c3d3be898ba6 100644
--- a/sound/soc/codecs/adau1372.c
+++ b/sound/soc/codecs/adau1372.c
@@ -1002,6 +1002,17 @@ int adau1372_probe(struct device *dev, struct regmap *regmap,
 
 	regmap_write(regmap, ADAU1372_REG_OP_STAGE_MUTE, 0x0);
 
+	/*
+	 * Set sane default values for the Output ASRC and DAC input muxes,
+	 * since the power-on reset defaults are invalid "Reserved" states.
+	 */
+	regmap_write(regmap, ADAU1372_REG_ASRCO_SOURCE_0_1,
+		     0x54); /* Decimator0, Decimator1 */
+	regmap_write(regmap, ADAU1372_REG_ASRCO_SOURCE_2_3,
+		     0x76); /* Decimator2, Decimator3 */
+	regmap_write(regmap, ADAU1372_REG_DAC_SOURCE,
+		     0xdc); /* Input ASRC0, Input ASRC1 */
+
 	regmap_write(regmap, 0x7, 0x01); /* CLOCK OUT */
 
 	return  devm_snd_soc_register_component(dev, &adau1372_driver, &adau1372_dai_driver, 1);

-- 
2.54.0