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From: Marcel Holtmann <marcel@holtmann.org>
To: "\"Mark-YW Chen (陳揚文)\"" <Mark-YW.Chen@mediatek.com>
Cc: Johan Hedberg <johan.hedberg@gmail.com>,
	chris.lu@mediatek.com, will-cy.lee@mediatek.com,
	sean.wang@mediatek.com, linux-bluetooth@vger.kernel.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	michaelfsun@google.com, shawnku@google.com, jemele@google.com,
	apusaka@google.com, mcchou@chromium.org
Subject: Re: [PATCH v5 2/2] Bluetooth: btusb: Support Bluetooth Reset for Mediatek Chip(MT7921)
Date: Wed, 4 Aug 2021 16:49:13 +0200	[thread overview]
Message-ID: <F013475B-3F26-453F-A3C5-EFDD94703AEF@holtmann.org> (raw)
In-Reply-To: <20210804090316.12080-2-mark-yw.chen@mediatek.com>

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

patch has been applied to bluetooth-next tree.

Regards

Marcel


      parent reply	other threads:[~2021-08-04 14:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210804090316.12080-1-mark-yw.chen@mediatek.com>
2021-08-04 14:48 ` [PATCH v5 1/2] Bluetooth: btusb: Record debug log for Mediatek Chip Marcel Holtmann
2021-08-04 23:14   ` Tedd Ho-Jeong An
2021-08-05 13:12     ` Marcel Holtmann
     [not found] ` <20210804090316.12080-2-mark-yw.chen@mediatek.com>
2021-08-04 14:49   ` Marcel Holtmann [this message]

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