Linux/PROCESSOR-SDK-AM335X: McASP internal MCLK issue

hussain ali

Part Number: PROCESSOR-SDK-AM335X
Other Parts Discussed in Thread: TLV320AIC3104

Tool/software: Linux

Hi all,
I am using beagle bone black with kernel 4.4.41-rt50-g968d071ce9. (am335x-evm-linux-rt-sdk-src-03.03.00.04.tar.tar package)
I want to run audio subsystem with the tlv320aic3104 codec.

My goal is to use internal clock for MCLK ( instead of externall clock provided by oscillator) and the codec become master.

I edited the base dts and added the proper nodes for configuring audio subsystem.

But when i run speaker-test utility, it gets follows error:

Write error: -5,input/output error
xrun_recovery failed: -5 input/output error
Transfer failed: input/output error

also I have no signal on the ahclkx pin.

where is the source of the problem?

here is my dts file:

Fullscreen 3542.am335x-boneblack.dts.txt Download

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;

#include "am33xx.dtsi"
#include "am33xx-es2.dtsi"
#include "am335x-bone-common.dtsi"

#include <dt-bindings/board/am335x-bbw-bbb-base.h>
#include <dt-bindings/pinctrl/am33xx.h>

/ {
	model = "TI AM335x BeagleBone Black";
	compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";

	
	sound {
		compatible = "simple-audio-card";
		simple-audio-card,name = "AudioCape Rev B";
		simple-audio-card,widgets =
			"Headphone", "Headphone Jack",
			"Line", "Line In";
		simple-audio-card,routing =
			"Headphone Jack",       "HPLOUT",
			"Headphone Jack",       "HPROUT",
			"LINE1L",               "Line In",
			"LINE1R",               "Line In";
		simple-audio-card,format = "dsp_b";
		simple-audio-card,bitclock-master = <&sound_master>;
		simple-audio-card,frame-master = <&sound_master>;
		simple-audio-card,bitclock-inversion;
	
		simple-audio-card,cpu {
			sound-dai = <&mcasp0>;
		};
	
	        sound_master: simple-audio-card,codec {
			#sound-dai-cells = <0>;
			sound-dai = <&tlv320aic3104>;
			system-clock-frequency = <24576000>;
		};
	};
};

&ldo3_reg {
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-always-on;
};

&mmc1 {
	vmmc-supply = <&vmmcsd_fixed>;
};

&mmc2 {
	vmmc-supply = <&vmmcsd_fixed>;
	pinctrl-names = "default";
	pinctrl-0 = <&emmc_pins>;
	bus-width = <8>;
	status = "okay";
};

&am33xx_pinmux {
	bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
		pinctrl-single,pins = <
			0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_aclkx.mcasp0_aclkx */
			0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_fsx.mcasp0_fsx, INPUT */
			0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_axr0.mcasp0_axr0 */
			0x19c (PIN_INPUT_PULLDOWN | MUX_MODE2)	/* mcasp0_ahclkr.mcasp0_axr2 */
			0x1ac (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* MCASP0_AHCLKX -> MCASP0_AHCLKX (I2S_MCLK_OUT)- in */
		>;
	};
	i2c2_pins: pinmux_i2c2_pins {
		pinctrl-single,pins = <
			/* P9_20: uart1_ctsn.i2c2_sda */
			BONE_P9_20 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
			/* P9_19: uart1_rtsn.i2c2_scl */
			BONE_P9_19 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
		>;
	};
};

&i2c2  {
	#address-cells = <1>;
	#size-cells = <0>;
	clock-frequency = <100000>;
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&i2c2_pins>;

	tlv320aic3104: tlv320aic3104@18 {
		#sound-dai-cells = <0>;
		compatible = "ti,tlv320aic3104";
		reg = <0x18>;
	};
};

&mcasp0  {
	#sound-dai-cells = <0>;
	pinctrl-names = "default";
	pinctrl-0 = <&bone_audio_cape_audio_pins>;
	status = "okay";
	op-mode = <0>;          /* MCASP_IIS_MODE */
	tdm-slots = <2>;
	num-serializer = <16>;
	serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
		2 0 1 0
		0 0 0 0
		0 0 0 0
		0 0 0 0
	>;
	tx-num-evt = <1>;
	rx-num-evt = <1>;
};

over 8 years ago

0 hussain ali over 8 years ago

Prodigy 30 points

I added to simple-audio-card,cpu subnode below properties. But there is no difference in results

system-clock-direction = "out";

system-clock-frequency = <24576000>;

I also changed the pin muxing of ahclkx to output pin.

this my new dts file:

Fullscreen 8168.am335x-boneblack.dts.txt Download

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;

#include "am33xx.dtsi"
#include "am33xx-es2.dtsi"
#include "am335x-bone-common.dtsi"

#include <dt-bindings/board/am335x-bbw-bbb-base.h>
#include <dt-bindings/pinctrl/am33xx.h>

/ {
	model = "TI AM335x BeagleBone Black";
	compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";

	
	sound {
		compatible = "simple-audio-card";
		simple-audio-card,name = "AudioCape Rev B";
		simple-audio-card,widgets =
			"Headphone", "Headphone Jack",
			"Line", "Line In";
		simple-audio-card,routing =
			"Headphone Jack",       "HPLOUT",
			"Headphone Jack",       "HPROUT",
			"LINE1L",               "Line In",
			"LINE1R",               "Line In";
		simple-audio-card,format = "dsp_b";
		simple-audio-card,bitclock-master = <&sound_master>;
		simple-audio-card,frame-master = <&sound_master>;
		simple-audio-card,bitclock-inversion;
	
		simple-audio-card,cpu {
			sound-dai = <&mcasp0>;
			system-clock-direction = "out";
			system-clock-frequency = <24576000>;
		};
	
	        sound_master: simple-audio-card,codec {
			#sound-dai-cells = <0>;
			sound-dai = <&tlv320aic3104>;
			system-clock-frequency = <24576000>;
		};
	};
};

&ldo3_reg {
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-always-on;
};

&mmc1 {
	vmmc-supply = <&vmmcsd_fixed>;
};

&mmc2 {
	vmmc-supply = <&vmmcsd_fixed>;
	pinctrl-names = "default";
	pinctrl-0 = <&emmc_pins>;
	bus-width = <8>;
	status = "okay";
};

&am33xx_pinmux {
	bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
		pinctrl-single,pins = <
			0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_aclkx.mcasp0_aclkx */
			0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_fsx.mcasp0_fsx, INPUT */
			0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_axr0.mcasp0_axr0 */
			0x19c (PIN_INPUT_PULLDOWN | MUX_MODE2)	/* mcasp0_ahclkr.mcasp0_axr2 */
			0x1ac (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* MCASP0_AHCLKX -> MCASP0_AHCLKX (I2S_MCLK_OUT)- in */
		>;
	};
	i2c2_pins: pinmux_i2c2_pins {
		pinctrl-single,pins = <
			/* P9_20: uart1_ctsn.i2c2_sda */
			BONE_P9_20 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
			/* P9_19: uart1_rtsn.i2c2_scl */
			BONE_P9_19 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
		>;
	};
};

&i2c2  {
	#address-cells = <1>;
	#size-cells = <0>;
	clock-frequency = <100000>;
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&i2c2_pins>;

	tlv320aic3104: tlv320aic3104@18 {
		#sound-dai-cells = <0>;
		compatible = "ti,tlv320aic3104";
		reg = <0x18>;
	};
};

&mcasp0  {
	#sound-dai-cells = <0>;
	pinctrl-names = "default";
	pinctrl-0 = <&bone_audio_cape_audio_pins>;
	status = "okay";
	op-mode = <0>;          /* MCASP_IIS_MODE */
	tdm-slots = <2>;
	num-serializer = <16>;
	serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
		2 0 1 0
		0 0 0 0
		0 0 0 0
		0 0 0 0
	>;
	tx-num-evt = <1>;
	rx-num-evt = <1>;
};

0 Biser Gatchev-XID over 8 years ago in reply to hussain ali

TI__Guru**** 393215 points

There is no way to generate an internal master clock with a frequency of 24.576MHz on the AM335x device.

0 hussain ali over 8 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Thanks Biser.

I have to point out that I was able to run the sound subsystem. Of course, with the settings

in which the CPU was Master. That is, I was able to use the internal CPU clock. Although the

fsclk and blck that it produced was not accurate, and that's why I want to get a system in which

the codec is in the master mode! (while using the internall clock).

My question is

is there a way to use internal clock instead of an external clock? Also, the codec works in

Master mode. In other words,it's a codec that produces fs and bclk.

It's also my DTS file with the settings I said:

Fullscreen 4137.am335x-boneblack.dts.txt Download

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;

#include "am33xx.dtsi"
#include "am33xx-es2.dtsi"
#include "am335x-bone-common.dtsi"

#include <dt-bindings/board/am335x-bbw-bbb-base.h>
#include <dt-bindings/pinctrl/am33xx.h>

/ {
	model = "TI AM335x BeagleBone Black";
	compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";

	
	sound {
		compatible = "simple-audio-card";
		simple-audio-card,name = "AudioCape Rev B";
		simple-audio-card,widgets =
			"Headphone", "Headphone Jack",
			"Line", "Line In";
		simple-audio-card,routing =
			"Headphone Jack",       "HPLOUT",
			"Headphone Jack",       "HPROUT",
			"LINE1L",               "Line In",
			"LINE1R",               "Line In";
		simple-audio-card,format = "dsp_b";
		simple-audio-card,bitclock-master = <&sound_master>;
		simple-audio-card,frame-master = <&sound_master>;
		simple-audio-card,bitclock-inversion;
	
		sound_master: simple-audio-card,cpu {
			sound-dai = <&mcasp0>;
			system-clock-direction = "out";
			system-clock-frequency = <24576000>;
		};
	
	        simple-audio-card,codec {
			#sound-dai-cells = <0>;
			sound-dai = <&tlv320aic3104>;
			system-clock-frequency = <24576000>;
		};
	};
};

&ldo3_reg {
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-always-on;
};

&mmc1 {
	vmmc-supply = <&vmmcsd_fixed>;
};

&mmc2 {
	vmmc-supply = <&vmmcsd_fixed>;
	pinctrl-names = "default";
	pinctrl-0 = <&emmc_pins>;
	bus-width = <8>;
	status = "okay";
};

&am33xx_pinmux {
	bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
		pinctrl-single,pins = <
			0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_aclkx.mcasp0_aclkx */
			0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_fsx.mcasp0_fsx, INPUT */
			0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0)	/* mcasp0_axr0.mcasp0_axr0 */
			0x19c (PIN_INPUT_PULLDOWN | MUX_MODE2)	/* mcasp0_ahclkr.mcasp0_axr2 */
			0x1ac (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* MCASP0_AHCLKX -> MCASP0_AHCLKX (I2S_MCLK_OUT)- in */
		>;
	};
	i2c2_pins: pinmux_i2c2_pins {
		pinctrl-single,pins = <
			/* P9_20: uart1_ctsn.i2c2_sda */
			BONE_P9_20 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
			/* P9_19: uart1_rtsn.i2c2_scl */
			BONE_P9_19 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE3)
		>;
	};
};

&i2c2  {
	#address-cells = <1>;
	#size-cells = <0>;
	clock-frequency = <100000>;
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&i2c2_pins>;

	tlv320aic3104: tlv320aic3104@18 {
		#sound-dai-cells = <0>;
		compatible = "ti,tlv320aic3104";
		reg = <0x18>;
	};
};

&mcasp0  {
	#sound-dai-cells = <0>;
	pinctrl-names = "default";
	pinctrl-0 = <&bone_audio_cape_audio_pins>;
	status = "okay";
	op-mode = <0>;          /* MCASP_IIS_MODE */
	tdm-slots = <2>;
	num-serializer = <16>;
	serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
		2 0 1 0
		0 0 0 0
		0 0 0 0
		0 0 0 0
	>;
	tx-num-evt = <1>;
	rx-num-evt = <1>;
};

Regards

0 Biser Gatchev-XID over 8 years ago in reply to hussain ali

TI__Guru**** 393215 points

You can use the CLKOUT1 output from the AM335x to feed the main oscillator clock to the Codec MCLK. The Codec itself has an internal PLL, which can be programmed to generate the bit clock frequency you require. I will ask the software team to comment whether this use case is supported by the Linux driver. They will respond directly here.

Processors

Processors forum

Linux/PROCESSOR-SDK-AM335X: McASP internal MCLK issue