ASoC: msm8916-wcd-analog: Add MIC BIAS Internal3

PM8916 has three TX inputs that each have an (optional) internal
RBIAS resistor. MIC BIAS Internal1/2 (for TX1/2) are already supported.
TX3 does not have its own MIC BIAS supply, instead it is also supplied
from MIC_BIAS1.

Now that we have simplified the MIC BIAS Internal* implementation
we can easily add support for it:

Add a MIC BIAS Internal3 supply that enables the internal RBIAS
resistor on TX3, and make sure to also enable the MIC_BIAS1 supply.

Tested-by: Nikita Travkin <nikitos.tr@gmail.com> # longcheer-l8150
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200114181229.42302-2-stephan@gerhold.netSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/msm8916-wcd-analog.c

@@ -856,6 +856,7 @@ static const struct snd_soc_dapm_route pm8916_wcd_analog_audio_map[] = {
 	{"MIC BIAS Internal1", NULL, "MIC_BIAS1"},
 	{"MIC BIAS External2", NULL, "MIC_BIAS2"},
 	{"MIC BIAS Internal2", NULL, "MIC_BIAS2"},
+	{"MIC BIAS Internal3", NULL, "MIC_BIAS1"},
 };
 
 static const struct snd_soc_dapm_widget pm8916_wcd_analog_dapm_widgets[] = {
@@ -924,6 +925,9 @@ static const struct snd_soc_dapm_widget pm8916_wcd_analog_dapm_widgets[] = {
 			    pm8916_wcd_analog_enable_micbias_int2,
 			    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
 			    SND_SOC_DAPM_POST_PMD),
+	SND_SOC_DAPM_SUPPLY("MIC BIAS Internal3", CDC_A_MICB_1_INT_RBIAS, 1, 0,
+			    pm8916_wcd_analog_enable_micbias_int,
+			    SND_SOC_DAPM_PRE_PMU),
 
 	SND_SOC_DAPM_ADC_E("ADC1", NULL, CDC_A_TX_1_EN, 7, 0,
 			   pm8916_wcd_analog_enable_adc,