Re: [PATCH v5 2/2] Bluetooth: btusb: Support Bluetooth Reset for Mediatek Chip(MT7921)

Hi Mark,

When the firmware hang or command no response, driver can reset the
bluetooth mcu via USB to recovery it. The reset steps as follows.

1. Cancel USB transfer requests before reset.
2. It use speicific USB HW Register to reset Bluetooth MCU, at the
  same time, the USB Endpoint0 still keep alive.
3. Poll the USB HW register until reset is completed by Endpoint0.
4. To recovery unexpected USB state and behavior during resetting the
  Bluetooth MCU, the driver need to reset the USB device for MT7921.
5. After the reset is completed, the Bluetooth MCU need to re-setup,
  such as download patch, power-on sequence and etc.

Signed-off-by: mark-yw.chen <redacted>
Reviewed-by: Michael Sun <redacted>
Reviewed-by: Archie Pusaka <redacted>
---
drivers/bluetooth/btusb.c | 129 ++++++++++++++++++++++++++++++++++++++
1 file changed, 129 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel