Re: [PATCH v2] ASoC: qcom: SC7280: Add support for external DMIC bias supply

From: Srinivasa Rao Mandadapu
Date: Fri Jul 29 2022 - 08:03:53 EST



On 7/29/2022 2:09 PM, Srinivas Kandagatla wrote:
Thanks for your time and valuable input Srini!!!

On 28/07/2022 17:09, Srinivasa Rao Mandadapu wrote:

On 7/28/2022 7:52 PM, Mark Brown wrote:
Thanks for your time Mark!!!
On Thu, Jul 28, 2022 at 07:29:49PM +0530, Srinivasa Rao Mandadapu wrote:
Update SC7280 machine driver for enabling external dmic bias supply,
which is required for villager evt boards.
+++ b/sound/soc/qcom/sc7280.c
@@ -356,6 +356,7 @@ static const struct snd_soc_ops sc7280_ops = {
  static const struct snd_soc_dapm_widget sc7280_snd_widgets[] = {
      SND_SOC_DAPM_HP("Headphone Jack", NULL),
      SND_SOC_DAPM_MIC("Headset Mic", NULL),
+    SND_SOC_DAPM_REGULATOR_SUPPLY("DMICVDD", 0, 0),
  };
  static int sc7280_snd_platform_probe(struct platform_device *pdev)
Don't you want to connect this to something?  This won't do anything
as-is.  I can't see any references to DMICVDD which might be failing to
resolve in the current sound/soc/qcom.

The connection is being done to "VA DMIC"through audio routing in board specific dts file.

Will post the changes once the main dts patches are landed.

Ex:-

&sound {
     DMICVDD-supply = <&pp1800_l2c>;

     audio-routing =
             "IN1_HPHL", "HPHL_OUT",
             "IN2_HPHR", "HPHR_OUT",
             "AMIC1", "MIC BIAS1",
             "AMIC2", "MIC BIAS2",
             "VA DMIC0", "DMICVDD",
             "VA DMIC1", "DMICVDD",
             "VA DMIC2", "DMICVDD",
             "VA DMIC3", "DMICVDD",

You should just use "vdd-micb" instead of DMICVDD.
There is already a SUPPLY DAPM in lpass-va-macro codec.

--srini
Yes it's available in va macro. Will test with vdd-micb DAPM. if that works,  I think we can drop this patch.
             .....

             .....

};