imx95 19x19 board using codec as master example

[andyhuang_msi]

Hi everyone:

Our project using TI's codec 6PAIC3104IRHBRQ1.

BCLK, WCLK, DIN and DOUT are connected to SAI3 module of soc.

But the MCLK is connected to external Oscillator, OSC-24MHZ30_S-HF instead of SAI3 module of soc.

In this condition, the master CLK is provided by codec not by SAI3 module of soc.

I would like to ask if anyone could provide dts example of master CLK provided by codec. 

If necessary, I could provide my patch for review.

[JorgeCas]

Hello,

Unfortunately this CODEC is not supported by default on our BSP and there is no a guide to port it. The references we have are the i.MX porting guide.

My recommendation is declare the fixed clock configuration in CODEC side as follows:

codec_mclk: codec_mclk {
        compatible = "fixed-clock";
        #clock-cells = <0>;
        clock-frequency = <24000000>;
};

And use this properties to configure you CODEC as master, for example:

simple-audio-card,bitclock-master = <&dailink_codec>;
simple-audio-card,frame-master = <&dailink_codec>;

Best regards.

[andyhuang_msi]

@JorgeCas 

Thanks for your reply.

I found the codec driver of TI audio codec on imx95  bsp: 

vendor/nxp-opensource/kernel_imx/sound/soc/codecs/tlv320aic3x.c

vendor/nxp-opensource/kernel_imx/sound/soc/codecs/tlv320aic3x-i2c.c

I modify defconfig file(arch/arm64/configs/imx95_gki.fragment) to add two drivers into compile:

+CONFIG_SND_SOC_TLV320AIC3X=m
+CONFIG_SND_SOC_TLV320AIC3X_I2C=m      

device/nxp/imx9/evk_95/SharedBoardConfig.mk

BOARD_VENDOR_KERNEL_MODULES += \

+ $(KERNEL_OUT)/sound/soc/codecs/snd-soc-tlv320aic3x.ko \
+ $(KERNEL_OUT)/sound/soc/codecs/snd-soc-tlv320aic3x-i2c.ko \

I also take your suggestion and modify dts.

The attached files containing modified dts, imx95-19x19-evk.dts and patch, imx95_evk_dts.patch.

The following section details the changes and their purposes.

(1)&sai3, pinctrl_sai3, pinctrl_sai3_sleep:

      BCLK, WCLK, DIN and DOUT gpio of audio codec connect to SAI3 module of soc.

      MCLK gpio not connected to soc and comment.

(2)codec_mclk: codec-mclk

 add a fixed clock as suggestion

(3)tlv320aic3x: tlv320aic3x@18

audio codec driver node

clocks = <&codec_mclk>;   reference to fixed clock codec_mclk

(4)sound-tlv320aic3x

dai connection of sai3 module of soc and TI audio codec

 simple-audio-card,bitclock-master and simple-audio-card,frame-master reference dailink_master_codec as master.

The dailink_master_codec set clocks to fixed clock codec_mclk。

I prepare three audio wav files and use tinyplay to test speaker of audio codec.

Although no error messages happened during test prieod of the three wav files, I cannot hear the audio.

ex:

tinyplay /sdcard/rhj08-s3gh1_2.wav -D 2

Playing sample: 2ch, 48000 hz, 16bit 1414376 bytes
Draining... Wait 85333 us

I also use some commands, i2cdetect, lsmod, cat /proc/asound/cards , tinypcminfo -D 2, cat /sys/kernel/debug/clk/clk_summary | grep "codec-mclk" and tinyplay command to test the audio codec.

The results are listed in the attached file, audio_test_commands_results.txt.

I would like to ask if  any suggestion about current dts or linux command to check status of audio codec?

[JorgeCas]

Hello,

Thank you for the update.

Please try to change the clock configuration as is in commented SAI3 node:

assigned-clock-rates = <3932160000>,
    <3612672000>, <393216000>,
    <361267200>, <12288000>;

If possible please confirm if there are activity in SAI signals when sound should be playing.

Also, I suggest you confirm if the audio routing is according to the outputs you are using.

Could you please share your dmesg?

Best regards.

[andyhuang_msi]

@JorgeCas 

Thanks for your reply.

Considering HW change doubt, we have changed MCLK of HW design connecting to GPIO17 of soc instead of external oscillator.

I also modify dts corresponding to HW change and not hear audio sound using tinyplay command to play 48000 rate wav file.

Our EE measure the activity in SAI3 signals:

SAI3_TX_BCLK,SAI3_TX_SYNC, SAI3_TX_DATA_BIT0, SAI3_MCLK all detect signal TX and CODEC_SAI3_RXD not detect signal TX.

And the LEFT_LOP and LEFT_LOM of audio codec connected to speaker amplifier not detect signal TX.

The attached zip file contain whole dts file: imx95-19x19-evk.dts

                                                    dts file patch: 0608_evk_dts_audio.patch

                                                    dmesg file       :teraterm_0608_dmesg  

                                                    command test result file: audio_commands_results_0608.txt

                                                    current audio codec driver: tlv320aic3x.c, tlv320aic3x-i2c.c

The audio routing is according to the driver, tlv320aic3x.c  part: 

static const struct snd_soc_dapm_route intercon[]

/* Left Line Output */  and   /* Right Line Output */

I use some commands to check status of audio codec:

cat /sys/kernel/debug/clk/clk_summary | grep -A5 -B5 sai3

before tinyplay wav file:

sai3                          0       0        0        12288000    0          0     50000      Y         tlv320aic3x@18                  no_connection_id

                                                                                                                                     42650000.sai                       mclk1

during tinyplay wav file:

sai3                          1       1        0        12288000    0          0     50000      Y         tlv320aic3x@18                  no_connection_id

                                                                                                                                     42650000.sai                      mclk1

->enable_cnt  and prepare_cnt of sai3 has changed.

Question1:

Does my dts modified has any wrong setting?

Question2:

How do I check if the setting of audio routing part is correct?

[andyhuang_msi · Accepted solution]

The HW has modified to MCLK connected to soc instead of external oscillator.

After adjusting setting of tinymix, the speaker is capable of audio output.

This issue should be closed.