topic ASoC machine driver for CX20721 codec in i.MX Processors

ASoC machine driver for CX20721 codec

titusstalin — Mon, 09 Oct 2017 02:50:03 GMT

Hello Experts,

I have interfaced the CX20721 codec into my imx6 board.

Codec driver used:

rpi-linux/cx2072x.c at cnxt-rpi-4.4.y · conexant/rpi-linux · GitHub

And I have used the following ASoC machine driver (raspberry pi ASoC machine driver) for my imx6 platform.

driverpatch/0006-ASoC-Add-Mahine-driver-for-SmartSpeaker-I2S.patch at master · conexant/driverpatch · GitHub

Attached the modified machine driver (two types).

1. Based on Raspberry pi ASoC machine driver.

2. Based on imx-sgtl5000.c machine driver.

Getting the following errors:

[    2.636502] cx2072x 2-0033: cx2072x_i2c_probe: Register codec.
[    2.641330] cxsmtspk-audio-i2s sound: ASoC: CODEC DAI cx2072x-dsp not registered
[    2.647532] cxsmtspk-audio-i2s sound: snd_soc_register_card failed (-517)
[    2.738449] cxsmtspk-audio-i2s sound: ASoC: CODEC DAI cx2072x-dsp not registered
[    2.744680] cxsmtspk-audio-i2s sound: snd_soc_register_card failed (-517)
[    2.761795] cxsmtspk-audio-i2s sound: ASoC: CODEC DAI cx2072x-dsp not registered
[    2.768713] cxsmtspk-audio-i2s sound: snd_soc_register_card failed (-517)

imx-cx20721.c -> Based on Raspberry pi ASoC machine driver.

imx-cx20721_type2.c -> Based on imx-sgtl5000.c

Here is the reference:

GitHub - CNXT-Jerry/CX2072X

CX2072X/doc at master · CNXT-Jerry/CX2072X · GitHub

Original Attachment has been moved to: imx-cx20721_type2.c.zip

Original Attachment has been moved to: imx-cx20721.c.zip

Re: ASoC machine driver for CX20721 codec

igorpadykov — Mon, 09 Oct 2017 07:20:14 GMT

Hi Titus

please check if correct clocks are produced after probing,

sect.Table 7-1. Stereo Codec SoC Driver Files attached Linux Manual

shows ALSA SoC structure and one can further debug it using

AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
http://www.nxp.com/assets/documents/data/en/application-notes/AN4553.pdf

Best regards
igor
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Re: ASoC machine driver for CX20721 codec

titusstalin — Mon, 09 Oct 2017 12:05:34 GMT

Hi Igor,

Thanks for the reply.

I will look into this.

Quick questions below, can you help ?

How 'mux-int-port' and 'mux-ext-port' are used and how can I use & configure it for my codec ?
mux-int-port = <1>;

mux-ext-port = <3>

I've referred the following links, SGTL5000 codec configured in different internal and external AUDMUX ports. Why and how? we should change this based on the HW connection ?

SGTL5000 audio

linux-imx6/imx-audio-sgtl5000.txt at master · samnazarko/linux-imx6 · GitHub

And when I can decide to configure my codec as master or slave ? based on the clock generation alone or any other reason behind ?

sound {
    compatible = "fsl,imx-audio-sgtl5000";
    model = "sgtl5000-audio";
    cpu-dai = <&ssi2>;
    audio-codec = <&sgtl5000>;
    audio-routing =
        "MIC_IN", "Mic Jack",
        "Mic Jack", "Mic Bias",
        "Headphone Jack", "HP_OUT";
    mux-int-port = <2>;
    mux-ext-port = <3>;
    hp-det-gpios = <&gpio2 0 0>;
    hp-det-debounce = <250>;
};

sound {
compatible = "fsl,imx51-babbage-sgtl5000",
"fsl,imx-audio-sgtl5000";
model = "imx51-babbage-sgtl5000";
ssi-controller = <&ssi1>;
audio-codec = <&sgtl5000>;
audio-routing =
"MIC_IN", "Mic Jack",
"Mic Jack", "Mic Bias",
"Headphone Jack", "HP_OUT";
mux-int-port = <1>;
mux-ext-port = <3>;
};

Re: ASoC machine driver for CX20721 codec

igorpadykov — Mon, 09 Oct 2017 23:35:08 GMT

Hi Titus

for understanding AUDMUX operation one can look at

AN2628 Programming Audio Applications
http://www.nxp.com/docs/en/application-note/AN2628.pdf
Chapter 20 Porting Audio Codecs to a Custom Board i.MX53 UG
https://www.nxp.com/docs/en/user-guide/MX53UG.pdf

Best regards
igor