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

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Date:   Wed, 4 Aug 2021 16:49:13 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     "Mark-YW Chen (陳揚文)" 
        <Mark-YW.Chen@...iatek.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>, chris.lu@...iatek.com,
        will-cy.lee@...iatek.com, sean.wang@...iatek.com,
        linux-bluetooth@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        michaelfsun@...gle.com, shawnku@...gle.com, jemele@...gle.com,
        apusaka@...gle.com, mcchou@...omium.org
Subject: 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 <mark-yw.chen@...iatek.com>
> Reviewed-by: Michael Sun <michaelfsun@...gle.com>
> Reviewed-by: Archie Pusaka <apusaka@...omium.org>
> ---
> drivers/bluetooth/btusb.c | 129 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 129 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel