Alsamixer for rockchip rk817 audio device do not contains any volume settings

[Sfinx]

According to rk817 documentation there are present as DAC as ADC volume settings. How to enable them in alsamixer ?

[Sfinx]

Image used: debian b27 xfce

[RadxaYuntian]

Can you screenshot the relative pages? I don't quite understand what you are talking about here.

[Sfinx]

The 5.10.x rk817 driver do not have these settings. Moreover - it do not enable the MICBIAS at MIC input pin which makes the noise while recording through CM3 I/O 3.5mm jack. The 6.6.x rk817 driver definitely has as volume settings as MICBIAS:

#define RK817_CODEC_DADC_VOLL           0x1a
#define RK817_CODEC_DADC_VOLR           0x1b
#define RK817_CODEC_DDAC_VOLL           0x31
#define RK817_CODEC_DDAC_VOLR           0x32

static const struct snd_kcontrol_new rk817_volume_controls[] = {
        SOC_DOUBLE_R_RANGE_TLV("Master Playback Volume", RK817_CODEC_DDAC_VOLL,
                RK817_CODEC_DDAC_VOLR, 0, 0x00, 0xff, 1, rk817_vol_tlv),
        SOC_DOUBLE_R_RANGE_TLV("Master Capture Volume", RK817_CODEC_DADC_VOLL,
                RK817_CODEC_DADC_VOLR, 0, 0x00, 0xff, 1, rk817_vol_tlv),
        SOC_DOUBLE_TLV("Mic Capture Gain", RK817_CODEC_DMIC_PGA_GAIN, 4, 0, 0xf, 0,
                rk817_gain_tlv),
};

But the 6.6.x kernel is unsupported which means that CM3 audio is unusable with any kernel. Currently I'm evaluating CM3 for VoIP project.

[Sfinx]

I've managed to add playback/capture volume settings to 5.10.x rk817 driver but seems like there no MICBIAS circuit present inside rk817. This means that CM3 I/O audio is unusable for MIC recording from its design.

[vamrs-feng]

This is the circuit diagram for the RK817 codec, the MIC pin There is a headphone cradle connected to the baseboard, and the recording function can be verified using our published mirror.

[vamrs-feng]

[Sfinx]

It is not clear what you mean under "recording function can be verified using our published mirror". The only way to verify the recording function is to insert MIC into CM3 and check the result WAV file. So try this by yourself first. You will have something like this:

cm3-mic.wav.gz

[vamrs-feng]

What hardware version of CM3 and CM3IO are you using? Also are you recording your operations from the command line, can you provide the recording commands you entered?

[vamrs-feng]

Our test engineers have verified this feature, so it could be some other factor. Can you provide more information so we can troubleshoot?

[Sfinx]

Radxa CM3 module revision is v1.32A 20221103 Radxa CM3 I/O board revision is v1.32

Gembird MIC-211 mic inserted in CM3 I/O 3.5mm audio jack, record command used:

arecord -D plughw:CARD=rockchiprk817,DEV=0 -r 16000 -f S16_LE -V mono cm3-mic.wav

[Sfinx]

re-opening

[Sfinx]

I guess the problem is in too low MIC bias voltage (R34/C36 at CM3 I/O board) - it is wired to 1.8V but must be wired to 3.3V.