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

[Marcel Holtmann]

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 <mark-yw.chen at mediatek.com>
> Reviewed-by: Michael Sun <michaelfsun at google.com>
> Reviewed-by: Archie Pusaka <apusaka at chromium.org>
> ---
> drivers/bluetooth/btusb.c | 129 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 129 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel