Re: [PATCH v2] Bluetooth: btusb: Reset port on cmd timeout

[Marcel Holtmann]

Hi Abhishek,

> QCA_ROME sometimes gets into a state where it is unresponsive to
> commands. Since it doesn't have support for a reset gpio, reset the usb
> port when this occurs instead.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx>
> ---
> On Chromebooks with this chipset, we encountered cmd_timeout after
> running suspend stress test for hundreds of iterations. Without
> a recovery mechanism, continued cmd_timeout failures eventually caused
> the suspend stress test to fail.
> 
> This change will just reset the port that the Bluetooth chip is on when
> cmd_timeout is encountered. At the very least, the driver will unload
> and stop affecting suspend. It doesn't seem to restore the BT controller
> to a good state however (this still requires a power cycle).
> 
> Changes in v2:
> - Renamed btusb_generic_usb_cmd_timeout to btusb_qca_cmd_timeout
> - Updated commit note
> 
> drivers/bluetooth/btusb.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel