I.MX6Q Sabre Auto HDMI audio not working

[deepika_t]

Hi

I am working on SabreAuto IMX6Q running Android Marshmallows(6.0.1). I am able to see HDMI video but my HDMI audio is not working. My bootargs are:

setenv bootargs console=ttymxc3,115200 androidboot.console=ttymxc3 consoleblank=0 vmalloc=320M init=/init video=mxcfb0:dev=hdmi,1920x1080M@60,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off androidboot.hardware=freescale cma=384M.

In the kernel logs I am getting the following:

imx-audio-hdmi sound-hdmi.22: hdmi-hifi <-> hdmi_audio.3 mapping ok

ALSA device list:

  #0: cs42888-audio

  #1: imx-spdif

  #2: imx-hdmi-soc

I am unplay to listen to audio from HDMI.

In  android console I am getting the following error :

root@sabreauto_6q:/ # logcat | grep audio_hw_primary

01-01 00:16:29.668   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

01-01 00:16:29.672   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

01-01 00:16:29.676   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

01-01 00:16:29.677   221   521 W audio_hw_primary: pcm_write_wrapper continues failed for pcm 1, standby

01-01 00:16:29.677   221   521 W audio_hw_primary: do_out_standby... -1241192256

01-01 00:16:29.682   221   521 I audio_hw_primary: start_output_stream... -1241192256, device 1024

01-01 00:16:29.685   221   521 W audio_hw_primary: card 2, port 0 device 0x400

01-01 00:16:29.685   221   521 W audio_hw_primary: rate 48000, channel 2 period_size 0x300

01-01 00:16:39.757   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

01-01 00:16:39.761   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

01-01 00:16:39.766   221   522 W audio_hw_primary: out_set_parameters routing=1024, ret 0, out -1241192256

I am not able to understand why are we getting device or resource busy error? Do we need to enable something else for HDMI audio

Thanks and regards

Deepika Teriar

[vinodmaverickr0]

Hi Deepika,

I think you can try it on kernel level before proceeding to Android through tinyplay. It may be that you are not selecting the HDMI as Audio source. Because by default it will be CS4288 Audio codec.

tinyplay Fools.wav -d 2 

Thanks,

Maverick

[deepika_t]

Hi Vinod,

Thanks for your reply.

In Android if your HDMI is enabled the default audio route will be through HDMI.

Can audio codec and HDMI audio have outptut simultaneously at IMX6 android? 

   Check this link.

Thanks,

Deepika

[vinodmaverickr0]

Thanks for the update. 

My concern was about to play the audio over HDMI/DP through command line(like gstreamer or tinyalsa). where we always need to specify the card number, otherwise it will select the card number 0.

Thanks,

Vinod

[igorpadykov]

Hi Deepika

please try hdmi encoded audio with procedure described in

https://community.freescale.com/docs/DOC-93745#jive_content_id_4_Encoded_audio

note, audio on non-CEA modes is not officially supported, more details in :

https://boundarydevices.com/hdmi/

Best regards

igor

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[deepika_t]

Hi Igor..

I tried all the steps above..but still i am getting the same error.

My HDMI is in CEA mode..1920X1080p.

I am still getting

01-01 00:16:39.761   221   521 W audio_hw_primary: ret -1, pcm write 768 error cannot prepare channel: Device or resource busy

Do u have any other suggestions?

Thanks and Regards

Deepika Teriar

[igorpadykov]

Hi Deepika

is it working with linux ?

Board Support Packages (35)

L4.1.15_1.0.0_MX6QDLSOLO (REV L4.1.15_1.0.0)

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

Best regards

igor

[deepika_t]

Hi Igor

Sorry for late reply. I did not checked with only Linux as my system is running Android M.

Right now instead of HDMI audio I am trying to play audio from its audio codec CS42888.

Will need your help in it too :smileyhappy:

[deepika_t]

Thanks Igor

I will check this and let you know