How to Add bt-sco node in dts file of imx8mp phyboard pollux to make Hands free Profile in Android11

[surya45]

 Hi Nxp Community

can you please help me out how to add bt-sco sound card for pcm to make Hands free Profile work in android 11 on imx8mp phyboard pollux.

sharing the logs where i face the issue.

the A2DP sink works fine but when i make a call via phone connected to the board. the phone is gettiung disconnected from board.

so my doubt is do we need to add bt-sco function? if yes can anyone please share the process.

IMX8MPLUS#bluetooth #Handsfreeprofile #Android

@kingphome @Sanket_Parekh @david_ochs1 

[surya45]

my current dts file doesn't have any nodes related to bt-sco. can hfp work via wm8960 sound card.

in logs i see that get_card_for_hfp returning -1. how to add sound card for it a2dp works fine in bluetooth,

but Hfp is not working.

please help where ever need to make changes

08-28 04:11:32.667 679 1405 D audio_hw_primary: adev_set_parameters: enter: hfp_set_sampling_rate=16000
08-28 04:11:32.667 679 1405 I audio_hw_primary: hfp_set_sampling_rate, 16000
08-28 04:11:32.667 679 1405 D audio_hw_primary: adev_set_parameters: exit with code(0)
08-28 04:11:32.668 679 1405 D audio_hw_primary: adev_set_parameters: enter: hfp_enable=true
08-28 04:11:32.668 679 1405 I audio_hw_primary: prepare bt rx task
08-28 04:11:32.668 679 1405 D audio_hw_primary: get_card_for_hfp: card: -1
08-28 04:11:32.668 679 1405 I audio_hw_primary: set pcm_config_sco_in.period_size to 64
08-28 04:11:32.668 679 1405 I audio_hw_primary: open sco for read, card -1, port 0
08-28 04:11:32.668 679 1405 I audio_hw_primary: rate 16000, channel 1, period_size 0x40, period_count 8
08-28 04:11:32.668 679 1405 I audio_hw_primary: after pcm open, rate 16000, channel 1, period_size 0x40, period_count 8
08-28 04:11:32.668 679 1405 E audio_hw_primary: cannot open pcm_sco_rx: cannot open device '/dev/snd/pcmC4294967295D0c': No such file or directory

[Zhiming_Liu]

For dts configuration, you should refer imx8mp-evk.dts which contains bt-sco node.

We have added bt sco configuration in android: android_build/device/nxp/imx8m/evk_8mp/audio_policy_configuration_pcm512x.xml and audio_policy_configuration.xml