Hi All, The last 2 evenings I've been working on $subject, based on: 1) The btrtl patches from Martin Blumenstingl; + 2) The bt3wire driver from Marcel Holtmann; + 3) ACPI serdev binding support for the bt3wire driver by Jeremy Cline See: https://github.com/jwrdegoede/linux-sunxi/commits/master for the code, although there is not much to see there really. I have this almost working, the problem I have is really weird. If I start up a tablet with a RTL8723BS wifi chip and then log in using a bluetooth keyboard everything works. But if I log in with an USB keyboard, then I get the following messages, first in journal we see pulseaudio doing some setup to support bluetooth audio (it seems to do this as soon as I login): Bluetoothd[1282]: Endpoint registered: sender=:1.51 path=/MediaEndpoint/A2DPSource Bluetoothd[1282]: Endpoint registered: sender=:1.51 path=/MediaEndpoint/A2DPSink And then 2 seconds later I get: [ 191.177256] Bluetooth: hci0: command 0x0c24 tx timeout [ 191.179538] Bluetooth: hci0: Acknowledgement packet [ 193.226082] Bluetooth: hci0: command 0x0c52 tx timeout And if I press a key on the bluetooth keyboard after this: [ 1739.156758] Bluetooth: hci0: Acknowledgement packet [ 1741.182473] Bluetooth: hci0: command 0x0409 tx timeout Unloading and reloading the bt3wire module fixes this. Note that the bt controller sends Acknowledgement packets instead of a regular reply it seems, at least after the initial timeout. If I hack the kernel to not do serdev enumeration for the uart so I get a /dev/ttyS4 and then use: https://github.com/lwfinger/rtl8723bs_bt I do not get this problem. It almost is as if after we've initialized the bt controller through bt3wire.c it is in a sleep state or something and the bt keyboard sending data first wakes it up...? One thing which I found is that the hciattach_rtk.c userspace code sends an ack to the controller after it completes uploading the firmware. I tried to duplicate this like this: --- a/drivers/bluetooth/bt3wire.c +++ b/drivers/bluetooth/bt3wire.c @@ -788,6 +808,9 @@ static int bt3wire_btrtl_setup(struct bt3wire_dev *bdev) err = btrtl_download_firmware(bdev->hdev, btrtl_dev); + bt3wire_queue_pkt(bdev, PKT_TYPE_ACK, NULL, 0); + bt3wire_tx_wakeup(bdev); + out_free: btrtl_free(btrtl_dev); But I believe that is not the right way, I think that instead I should __hci_cmd_sync() but it is not entirely clear to me what I need to pass to that function to get the equivalent of bt3wire_queue_pkt(bdev, PKT_TYPE_ACK, NULL, 0); Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
