imx6q audio pcm format

whwshiyuan — Sat, 01 Jun 2019 04:02:16 GMT

Hi, all

I have a problem in imx6q SSI interface. I configure SSI in PCM master format, but BCLK and LRCLK not out. I configure SSI in I2S master format , BCLK and LRCLK can out. Anybody konow how to configure SSI in PCM master format. Thank you so much.

note：my linux version is 4.1.15

Re: imx6q audio pcm format

joanxie — Tue, 04 Jun 2019 08:50:30 GMT

"Here is the simple change that makes wm8962 codec to work as slave and SSI as master on 4.1.15 kernel:

https://pastebin.com/UAve2MS4 "

Re: imx6q audio pcm format

weidong_sun — Wed, 16 Oct 2019 02:07:08 GMT

Hi, hongwan,

Joan's answer is correct, you only need to remove "codec-master" from "sound" node:

mux-int-port = <2>;

mux-ext-port = <3>;

- codec-master;

hp-det-gpios = <&gpio7 8 1>;

mic-det-gpios = <&gpio1 9 1>;

BUT I don't know if you have configured dai format and cpu clock in "machine driver" like code below:

static int imx_hifi_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
{

    struct snd_soc_pcm_runtime *rtd = substream->private_data;
   struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
   u32 channels = params_channels(params);
   u32 rate = params_rate(params);

snd_pcm_format_t sample_format = params_format(params);

int ret = 0;

ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S
| SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);

     if (sample_format == SNDRV_PCM_FORMAT_S24_LE || sample_format == SNDRV_PCM_FORMAT_S20_3LE)
       bclk = rate * 384;
   else
       bclk = rate * 256;

ret = snd_soc_dai_set_sysclk(cpu_dai, 0, bclk, SND_SOC_CLOCK_OUT);

.... ...

}

Probably above code should be modified according to your codec datasheet, BUT you can try .

Have a nice day!

BR,

Weidong

i.MX Processorsのトピックimx6q audio pcm format

imx6q audio pcm format

Re: imx6q audio pcm format

Re: imx6q audio pcm format