ASoC: No stereo on Banana Pi M2 headphone jack

ASoC: No stereo on Banana Pi M2 headphone jack

[Michael]

Hi all,

I'm in need for stereo sound on the headphone jack of a Banana Pi M2 
(Allwinner A31s), but I'm getting only mono differential (I assume at 
least, because I can hear both channels in either speaker).

In alsamixer, there is a switch to select between stereo and mono 
diffential output for the LINE output (that has no notable effect), but 
not for the Headphone output.

Driver limitation/bug? Hardware deficiency? Configuration error? Any 
other idea?

FWIW, this is the DT overlay to get any sound at all:

/dts-v1/;
/plugin/;

/ {
	fragment@0 {
		target = <&codec>;
		__overlay__ {
			status = "okay";
			allwinner,audio-routing = "Headphone", "HP";
		};
	};
};


Regards,
Michael

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Re: ASoC: No stereo on Banana Pi M2 headphone jack

[Michael]

On Wed, Dec 30, 2020 at 11:58:14PM +0100, Michael wrote:
>Hi all,
>
>I'm in need for stereo sound on the headphone jack of a Banana Pi M2 
>(Allwinner A31s), but I'm getting only mono differential (I assume at 
>least, because I can hear both channels in either speaker).
>
>In alsamixer, there is a switch to select between stereo and mono 
>diffential output for the LINE output (that has no notable effect), 
>but not for the Headphone output.

Never mind; This happens if you plug a CTIA headset into a OMTP jack.

Michael

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