Linux/PROCESSOR-SDK-AM437X: Audio not working

Hi Vimal,

vimal kumar56 said:

I am using last release of rt-linux sdk "ti-processor-sdk-linux-rt-am437x-evm-04.01.00.06".

The latest rt-linux sdk release is "ti-processor-sdk-linux-rt-am437x-evm-04.02.00.09"

vimal kumar56 said:

I have a custom board based on am437x-gp-evm. we are using "TLV320AIC3106IRGZT" audio codec.

Please describe the exact differences you have between your custom board and AM437x EVM regarding McASP, I2C and audio codec.

vimal kumar56 said:

But there is no audio output when I am trying to play wav file using "aplay" or "AAC*" examples given in multimedia tab of matrix gui.

Please provide the full console output you have from the below commands:

  aplay -l

aplay -Dplughw:0,0 <path to wav file>

Pavel

vimal kumar56 said:

I have done pin-muxing changes for mcasp0

Do you actually mean McASP1? Can you clarify which McASP instance you are using on your custom board, McASP0 or McASP1? On AM437x TI EVM, McASP1 is used.

vimal kumar56 said:

simple-audio-card,widgets =
"Microphone", "Microphone Jack",

vimal kumar56 said:

simple-audio-card,routing =
"Mono Out", "MONO_LOUT",
"LINE1L", "Mic Bias";

Do you have Microphone on your custom board? On AM437x TI EVM, we do not have Micriphone, we have headphone out and line in.

vimal kumar56 said:

system-clock-frequency = <12000000>;

Do you have an external 12MHz crystal oscillator on your custom board, to be used to generate the source clock for the audio codec?

vimal kumar56 said:

serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
1 2 0 0

On AM437x EVM we use mcasp1_axr2 and mcasp1_axr3, while on your custom board you are using mcasp1_axr0 and mcasp1_axr1, is that correct?

Regards,
Pavel

Hi Pavel,

Thanks for looking into this. 

We do have some changes with respect to am437x-evm. As for i2c1_scl and i2c1_sda in gp-evm they are using T20(spi0_cs0 in mode 2), T21(spi0_d1 in mode 2), But we are using B13, and B14 lines from the processor.

i2c1_pins_default: i2c1_pins_default {
pinctrl-single,pins = <
AM4372_IOPAD(0x910, PIN_INPUT_PULLUP | SLEWCTRL_FAST | MUX_MODE3) /* (B13) mii1_rx_er.I2C1_SCL */
AM4372_IOPAD(0x90c, PIN_INPUT_PULLUP | SLEWCTRL_FAST | MUX_MODE3) /* (B14) mii1_crs.I2C1_SDA */
>;
};

we are using the same "tlv320aic3106" audio codec. We do have a microphone on our board.

For MCASP, we are also using MCASP1 and MCASP1_AXR0 and MCASP1_AXR1 for audio out and mic respectively.

There is difference between mcasp1 lines we are using from processor as what we are using is :

mcasp1_pins: mcasp1_pins {
pinctrl-single,pins = <
AM4372_IOPAD(0x9a0, PIN_INPUT_PULLDOWN | MUX_MODE3) /* (L23) mcasp0_aclkr.mcasp1_aclkx */
AM4372_IOPAD(0x9a4, PIN_INPUT_PULLDOWN | MUX_MODE3) /* (K23) mcasp0_fsr.mcasp1_fsx */
AM4372_IOPAD(0x9a8, PIN_OUTPUT_PULLDOWN | MUX_MODE3) /* (M25) mcasp0_axr1.mcasp1_axr0 */
AM4372_IOPAD(0x9ac, PIN_INPUT_PULLDOWN | MUX_MODE3) /* (L24) mcasp0_ahclkx.mcasp1_axr1 */
>;
};

But in am437x-gp-evm they are using:

mii1_col.mcasp1_axr2

mii1_crs.mcasp1_aclkx

mii1_rxerr.mcasp1_fsx

rmii1_ref_clk.mcasp1_axr3

 

These are the output of the aplay command you have asked in your previous reply.

root@am437x-evm:~#
root@am437x-evm:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: AM437xGPEVM [AM437x-GP-EVM], device 0: davinci-mcasp.0-tlv320aic3x-hifi tlv320aic3x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
root@am437x-evm:~#
root@am437x-evm:~#
root@am437x-evm:~# aplay -Dplughw:0,0 iphone_6_original.wav
Playing WAVE 'iphone_6_original.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@am437x-evm:~#
root@am437x-evm:~#

Warm Regards,

Vimal Kumar

Hi Pavel,

The pin-muxing and audio- codec routing is all proper. I am getting the sound from HDMI when booted with HDMI connected. we have a audio amplifier connected to codec which has a AMP_OFF gpio ( gpio2_3) which we shoud drive low for making the audio amplifier work.

we are doing it through dts as:

gpio_pins: gpio_pins {
pinctrl-single,pins = <
AM4372_IOPAD(0x894, PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* (E10) gpmc_oen_ren.gpio2_3 */
AM4372_IOPAD(0x944, PIN_INPUT_PULLUP | MUX_MODE7) /* (A16) rmii1_ref_clk.gpio0_29 */
>;
};

tlv320aic3106: tlv320aic3106@1b {
#sound-dai-cells = <0>;
compatible = "ti,tlv320aic3106";
reg = <0x1b>;
status = "okay";
ai3x-micbias-vg = <MICBIAS_2_0V>;
gpio = <&gpio2 3 GPIO_ACTIVE_LOW>;

/* Regulators */
IOVDD-supply = <&evm_v3_3d>; /* V3_3D -> <tps63031> EN: V1_8D -> VBAT */
AVDD-supply = <&evm_v3_3d>; /* v3_3AUD -> V3_3D -> ... */
DRVDD-supply = <&evm_v3_3d>; /* v3_3AUD -> V3_3D -> ... */
DVDD-supply = <&ldo1>; /* V1_8D -> LDO1 */
};

&gpio2 {
status = "okay";
p3 {
gpio-hog;
gpios = <3 GPIO_ACTIVE_HIGH>;
output-low;
line-name = "AMP_OFF";
};
};


But after this also gpio2_3 is not going low, it is in high state. If i am making that gpio go low by hardware means sound is working.

Any Idea why that gpio is still high with these changes?
If I am missing any defconfig or something else? It seems he dts configuration for gpio pins is not working?

warm regards,
vimal

Hi Pavel,

I changed the gpio2 node as you suggested and also disabled the nand_flash_x8 pin-muxing. Now I am getting the audio properly.

Thanks
vimal