ASoC: max9867: keep ADCs and DACs always on

Updating power management register requires toggling the shutdown
bit otherwise it causes unexpected behavior of the codec.
However, toggling the shutdown bit results in loud speaker crackling.
Setup the power management register only at startup to avoid that.

Signed-off-by: Pavel Dobias <dobias@2n.cz>
Link: https://lore.kernel.org/r/20200522142957.18364-3-dobias@2n.cz
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max9867.c

@@ -125,26 +125,26 @@ static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("LINL"),
 	SND_SOC_DAPM_INPUT("LINR"),
 
-	SND_SOC_DAPM_PGA("Left Line Input", MAX9867_PWRMAN, 6, 0, NULL, 0),
-	SND_SOC_DAPM_PGA("Right Line Input", MAX9867_PWRMAN, 5, 0, NULL, 0),
+	SND_SOC_DAPM_PGA("Left Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
+	SND_SOC_DAPM_PGA("Right Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
 	SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
 				     max9867_input_mixer_controls,
 				     ARRAY_SIZE(max9867_input_mixer_controls)),
 	SND_SOC_DAPM_MUX("DMICL Mux", SND_SOC_NOPM, 0, 0,
 			 &max9867_left_dmic_mux),
 	SND_SOC_DAPM_MUX("DMICR Mux", SND_SOC_NOPM, 0, 0,
 			 &max9867_right_dmic_mux),
-	SND_SOC_DAPM_ADC("ADCL", "HiFi Capture", MAX9867_PWRMAN, 1, 0),
-	SND_SOC_DAPM_ADC("ADCR", "HiFi Capture", MAX9867_PWRMAN, 0, 0),
+	SND_SOC_DAPM_ADC("ADCL", "HiFi Capture", SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_ADC("ADCR", "HiFi Capture", SND_SOC_NOPM, 0, 0),
 
 	SND_SOC_DAPM_MIXER("Digital", SND_SOC_NOPM, 0, 0,
 			   max9867_sidetone_mixer_controls,
 			   ARRAY_SIZE(max9867_sidetone_mixer_controls)),
 	SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", SND_SOC_NOPM, 0, 0,
 				     max9867_output_mixer_controls,
 				     ARRAY_SIZE(max9867_output_mixer_controls)),
-	SND_SOC_DAPM_DAC("DACL", "HiFi Playback", MAX9867_PWRMAN, 3, 0),
-	SND_SOC_DAPM_DAC("DACR", "HiFi Playback", MAX9867_PWRMAN, 2, 0),
+	SND_SOC_DAPM_DAC("DACL", "HiFi Playback", SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_DAC("DACR", "HiFi Playback", SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_SWITCH("Master Playback", SND_SOC_NOPM, 0, 0,
 			    &max9867_line_out_control),
 	SND_SOC_DAPM_OUTPUT("LOUT"),
@@ -452,15 +452,14 @@ static int max9867_set_bias_level(struct snd_soc_component *component,
 			if (err)
 				return err;
 
-			err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
-						 MAX9867_SHTDOWN, MAX9867_SHTDOWN);
+			err = regmap_write(max9867->regmap,
+					   MAX9867_PWRMAN, 0xff);
 			if (err)
 				return err;
 		}
 		break;
 	case SND_SOC_BIAS_OFF:
-		err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
-					 MAX9867_SHTDOWN, 0);
+		err = regmap_write(max9867->regmap, MAX9867_PWRMAN, 0);
 		if (err)
 			return err;
 

sound/soc/codecs/max9867.h

@@ -58,7 +58,6 @@
 #define MAX9867_MICCONFIG    0x15
 #define MAX9867_MODECONFIG   0x16
 #define MAX9867_PWRMAN       0x17
-#define MAX9867_SHTDOWN      0x80
 #define MAX9867_REVISION     0xff
 
 #define MAX9867_CACHEREGNUM 10