CM3 Unable to bring Bluetooth interface up

#1

We have a CM3 with custom Yocto build, however we are unable to bring Bluetooth up. I get the error message

root@device:/usr/sbin# hciconfig hci0 up
Can't init device hci0: Connection timed out (110)
root@device:/usr/sbin# hciconfig
hci0:	Type: Primary  Bus: UART
	BD Address: E8:FB:1C:F5:F7:8C  ACL MTU: 1021:8  SCO MTU: 64:1
	DOWN 
	RX bytes:687 acl:0 sco:0 events:36 errors:0
	TX bytes:447 acl:0 sco:0 commands:39 errors:0

root@device:/usr/sbin# systemctl status bluetooth
● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2023-05-27 21:26:35 UTC; 1 day 13h ago
       Docs: man:bluetoothd(8)
   Main PID: 286 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 1748)
     Memory: 1.8M
     CGroup: /system.slice/bluetooth.service
             └─286 /usr/libexec/bluetooth/bluetoothd

May 27 21:26:34 device systemd[1]: Starting Bluetooth service...
May 27 21:26:35 device systemd[1]: Started Bluetooth service.

From journal
May 29 11:19:03 device kernel: Bluetooth: hci0: command 0x1003 tx timeout
May 29 11:19:03 device kernel[205]: [136350.482996] Bluetooth: hci0: command 0x1003 tx timeout
May 29 11:19:06 device kernel: Bluetooth: hci0: command 0x1001 tx timeout
May 29 11:19:06 device kernel[205]: [136352.616281] Bluetooth: hci0: command 0x1001 tx timeout
May 29 11:19:08 device kernel: Bluetooth: hci0: command 0x1009 tx timeout
May 29 11:19:08 device kernel[205]: [136354.749531] Bluetooth: hci0: command 0x1009 tx timeout

Any suggestions on where to look as I see no differences between the standard Debian image and our build.

Thanks

Adam

#2

try reloading driver:

hciconfig hci0 down
rmmod btusb
modprobe btusb
hciconfig hci0 up
#3

Thanks, have tried but makes no difference Bluetooth is connected over UART so we are not using btusb

#4

You can try if the firmware is loaded by dmesg | grep Bluetooth.

#5

Thanks, this is result from dmesg

[    5.867286] Bluetooth: Core ver 2.22
[    5.867477] Bluetooth: HCI device and connection manager initialized
[    5.871900] Bluetooth: HCI socket layer initialized
[    5.872010] Bluetooth: L2CAP socket layer initialized
[    5.872150] Bluetooth: SCO socket layer initialized
[    5.905875] Bluetooth: HCI UART driver ver 2.3
[    5.905922] Bluetooth: HCI UART protocol H4 registered
[    5.905935] Bluetooth: HCI UART protocol ATH3K registered
#6 
echo 0 > /sys/class/rfkill/rfkill0/state
echo 1 > /sys/class/rfkill/rfkill0/state
brcm_patchram_plus1 --enable_hci --no2bytes --use_baudrate_for_download --tosleep 200000 --baudrate 1500000 --patchram /vendor/etc/firmware/BCM4345C0.hcd /dev/ttyS1 &

/vendor/etc/firmware/BCM4345C0.hcd is bt firmware.
have a try

#7

Thank you, that allowed me to bring up the interface and from there fix the init scripts