The Bluetooth service is unavailable

[shuhai]

1.Development Board : imx8mmevk

2.Linux version : 5.10.52-1.0

3.Description of the Problem :

I can't use Bluetooth service.

For example, when I input the linux instruction "hciconfig" on the terminal, I receive no feedback.

If I input the linux instruction "bluetoothctl discoverable on" and I get back "No default controller available".

Please help me! Thanks!

[shuhai]

Hi,

The  kernel 4.14 screenshot mentioned above

some logs about BT in kernel 4.14:

[ 0.853610] Bluetooth: Core ver 2.22
[ 0.861089] Bluetooth: HCI device and connection manager initialized
[ 0.867471] Bluetooth: HCI socket layer initialized
[ 0.872366] Bluetooth: L2CAP socket layer initialized
[ 0.877455] Bluetooth: SCO socket layer initialized
[ 2.439810] Bluetooth: HCI UART driver ver 2.3
[ 2.444278] Bluetooth: HCI UART protocol H4 registered
[ 2.449430] Bluetooth: HCI UART protocol QCA registered
[ 3.147950] Bluetooth: RFCOMM TTY layer initialized
[ 3.152904] Bluetooth: RFCOMM socket layer initialized
[ 3.158092] Bluetooth: RFCOMM ver 1.11
[ 3.161879] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 3.167238] Bluetooth: BNEP socket layer initialized
[ 16.750756] Bluetooth: hci0: ROME setup
[ 16.750773] Bluetooth: hci0: Set UART speed to 3000000

some logs about BT in kernel 5.10:

[ 0.432258] Bluetooth: Core ver 2.22
[ 0.439604] Bluetooth: HCI device and connection manager initialized
[ 0.445996] Bluetooth: HCI socket layer initialized
[ 0.450893] Bluetooth: L2CAP socket layer initialized
[ 0.455981] Bluetooth: SCO socket layer initialized
[ 1.172949] Bluetooth: HCI UART driver ver 2.3
[ 1.177426] Bluetooth: HCI UART protocol H4 registered
[ 1.188173] Bluetooth: HCI UART protocol QCA registered
[ 1.511037] Bluetooth: RFCOMM TTY layer initialized
[ 1.515932] Bluetooth: RFCOMM socket layer initialized
[ 1.521108] Bluetooth: RFCOMM ver 1.11
[ 1.524893] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 1.530219] Bluetooth: BNEP filters : protocol multicast
[ 1.538061] Bluetooth: BNEP socket layer initialized
[ 1.543032] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 1.548960] Bluetooth: HIDP socket layer initialized

I hope it's helpful.

Best regards,

Shuhai

[DanielRuvalcaba]

Thank you for the information.

Finally, could you please tell me what Wireless module you are using?

I will try to replicate this scenario.

Best regards,

Daniel

[shuhai]

I use Wireless module : QCA9377.

Thank you for your help.

Best regards,

Shuhai

[DanielRuvalcaba]

I could recommend you to take a look to the following thread. I believe you will find useful information that might be causing your problem.

https://community.nxp.com/t5/i-MX-Processors/iMX8MM-EVK-with-qca9377/m-p/1333287

Best regards,

Daniel.

[DanielRuvalcaba]

Hi,

My name is Daniel and I will be happy to help you.

Could you please share with me the previous steps you executed to bring up the Bluetooth interface? Also the logs you get when doing this?

Best regards,

Daniel.

[shuhai]

Hi,

When I used kernel 4.14, Bluetooth service was fine, screenshot below.

I wish kernel 5.10 could also use Bluetooth service.

Best regards,

Shuhai