Hfp profile for bluetooth sco data

[pravverma]

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

[igorpadykov]

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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[pravverma · Accepted solution]

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