Cannot have working SAI on iMX7D

jbaptiste_marie — Mon, 20 Jul 2020 17:35:39 GMT

Hello,

I am trying to configure SAI1 of the iMX7 to be used with an external codec.

Interesting part of my device tree is shown below:

sound {

compatible = "simple-audio-card";

status = "okay";

simple-audio-card,name = "My sound card";

simple-audio-card,format = "i2s";

clocks = <&clks IMX7D_AUDIO_MCLK_ROOT_CLK>;

assigned-clocks = <&clks IMX7D_AUDIO_MCLK_ROOT_SRC>,

<&clks IMX7D_AUDIO_MCLK_ROOT_CLK>;

assigned-clock-parents = <&clks IMX7D_PLL_AUDIO_POST_DIV>;

assigned-clock-rates = <0>, <24576000>;

mclk-fs = <512>;

simple-audio-card,cpu {

sound-dai = <&sai1>;

};

simple-audio-card,codec {

sound-dai = <&my_external_codec>;

};

...

&sai1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_sai1>;

assigned-clocks = <&clks IMX7D_SAI1_ROOT_SRC>,

<&clks IMX7D_SAI1_ROOT_CLK>;

assigned-clock-parents = <&clks IMX7D_PLL_AUDIO_POST_DIV>;

assigned-clock-rates = <0>, <24576000>;

status = "okay";

};

I am trying to play a 48kHz audio file with aplay and it always fails with this error:

aplay: set_params:1403: Unable to install hw params:

Going deeper into the code, it seems the problem comes in clk.c:

clk_calc_new_rates

That function is called when the DAI is configured:

ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,

SND_SOC_CLOCK_OUT);

The clk_calc_new_rates fails as "parent" is not defined when the function is called, and no callback are defined for the "derterminate_rate" and "round_rate" functions for the clock.

Kernel version is 4.14

I do not see what is wrong in my configuration, am i missing something?

Thanks for your help.

Re: Cannot have working SAI on iMX7D

igorpadykov — Mon, 20 Jul 2020 23:12:18 GMT

Hi Jean-Baptiste

for MX7 simple audio card one can look at

Eight channels audio on i.MX7 with PCM3168 - Bootlin's blog

Best regards
igor
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Re: Cannot have working SAI on iMX7D

jbaptiste_marie — Wed, 22 Jul 2020 15:34:24 GMT

Hello,

The mistake was on my side, the question is totally off topic.

However thanks for your answer.

Regards,

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Cannot have working SAI on iMX7D

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