linux-kernel - Re: [PATCH] Bluetooth: btrtl: HCI reset on close for RTL8822BE

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Message-ID: <CAD8Lp44RP+ugBcDYkap3tUL1NSq+knGJbO9A6UAmCtcjPgxTQQ@mail.gmail.com>
Date:   Mon, 24 Jun 2019 12:53:04 +0800
From:   Daniel Drake <drake@...lessm.com>
To:     Jian-Hong Pan <jian-hong@...lessm.com>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Bluetooth mailing list 
        <linux-bluetooth@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Bluetooth: btrtl: HCI reset on close for RTL8822BE

Hi Jian-Hong,

On Fri, Jun 21, 2019 at 4:59 PM Jian-Hong Pan <jian-hong@...lessm.com> wrote:
> Realtek RTL8822BE BT chip on ASUS X420FA cannot be turned on correctly
> after on-off several times.  Bluetooth daemon sets BT mode failed when
> this issue happens.
>
> bluetoothd[1576]: Failed to set mode: Failed (0x03)
>
> If BT is tunred off, then turned on again, it works correctly again.
> This patch makes RTL8822BE BT reset on close to fix this issue.

I know we've been trying to understand why Realtek's own bluetooth
driver avoids this bug, but is this solution based upon code in the
vendor driver?
At a glance I can't see the flag (or equivalent) being set there.

Daniel