topic Hfp profile for bluetooth sco data in i.MX Processors

Hfp profile for bluetooth sco data

pravverma — Fri, 28 Aug 2015 14:53:05 GMT

Hi,

I have created a module in HAL layer for hfp & modify the audio policy to go to hfp HAL. For the HFP data, code flow is going to pcm_write continuously but fails.

I am getting the following error for PCM write in HAL layer. Please let me know the possible reasons for failure.

W/audio_hw_hfp( 139): ret -1, pcm write 768 error cannot write stream data: I/O error

E/audio_hw_hfp( 139): write error, sleep few ms

W/AudioFlinger( 139): write blocked for 10022 msecs, 2 delayed writes, thread 0x73401000

E/AudioFlinger( 139): track 4097 s=00001f01 [OK] on thread 0x73401000

W/audio_hw_hfp( 139): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

E/audio_hw_hfp( 139): write error, sleep few ms

E/AudioFlinger( 139): track 4097 s=0000200a [OK] on thread 0x73401000

W/audio_hw_hfp( 139): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

E/audio_hw_hfp( 139): write error, sleep few ms

E/AudioFlinger( 139): track 4097 s=00002113 [OK] on thread 0x73401000

W/audio_hw_hfp( 139): ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

E/audio_hw_hfp( 139): write error, sleep few ms

In case if above error is due to improper initialization in kernel. I have mention the way how I am doing in kernel. Please let me know the above error is in kernel or in android.

I have created two sound cards. first for normal audio & second for bluetooth sco data & I can see both sound cards are created properly.

the device tree entry are as follows:

&audmux {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_audmux_1>;

pinctrl-1 = <&pinctrl_audmux_4>;

status = "okay";

};

sound {

compatible = "fsl,imx-audio-tlv320aic32x4";

model = "imx6q-tlv320aic32x4";

cpu-dai = <&ssi2>;

audio-codec = <&codec>;

audio-routing =

"Headphone Jack", "HPL",

"Headphone Jack", "HPR",

"IN3_R", "Mic Jack";

mux-int-port = <2>;

mux-ext-port = <4>;

};

dummy_codec: bt_codec {

compatible = "fsl,bt-sco";

status = "okay";

};

sound-bt {

compatible = "fsl,imx-audio-bt";

model = "imx6q-bt-sco";

cpu-dai = <&ssi1>;

audio-codec = <&dummy_codec>;

audio-routing =

"Headphone Jack", "TX",

"RX", "Mic Jack";

mux-int-port = <1>;

mux-ext-port = <6>;

};

ALSA device list:

#0: imx6q-tlv320aic32x4

#1: imx6q-bt-sco

Thanks,

Praveen

Re: Hfp profile for bluetooth sco data

igorpadykov — Sun, 30 Aug 2015 01:06:48 GMT

Hi prav

I think this may be due to kernel settings, please check

attached Linux Guide sect.7.4 Pulseaudio input/output settings

Best regards

igor

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Re: Hfp profile for bluetooth sco data

pravverma — Mon, 31 Aug 2015 12:24:54 GMT

Hi igor,

Thanks for the reply.

The Problem has been solved by modification to audmux entry:

Initially i was using audmux like this:

&audmux {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_audmux_1>;

pinctrl-1 = <&pinctrl_audmux_4>;

status = "okay";

};

later I made the following changes & pcm_write started working

1. Removed pinctrl-1 entry.

&audmux {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_audmux_1>;

status = "okay";

};

2. Added the "pinctrl_audmux_4" entries with the "pinctrl_audmux_1".

pinctrl_audmux_1: audmux-1 {

fsl,pins = <

/* pinctrl 1*/

MX6QDL_PAD_SD2_DAT0__AUD4_RXD 0x130b0

MX6QDL_PAD_SD2_DAT3__AUD4_TXC 0x130b0

MX6QDL_PAD_SD2_DAT2__AUD4_TXD 0x110b0

MX6QDL_PAD_SD2_DAT1__AUD4_TXFS 0x130b0

/* pinctrl 4 */

MX6QDL_PAD_DI0_PIN15__AUD6_TXC 0x130b0

MX6QDL_PAD_DI0_PIN3__AUD6_TXFS 0x130b0

MX6QDL_PAD_DI0_PIN2__AUD6_TXD 0x130b0

MX6QDL_PAD_DI0_PIN4__AUD6_RXD 0x130b0

};

Regards,

praveen