linux-kernel - Re: [PATCH v2 5/5] Bluetooth: hci_bcm: Increase host baudrate for CYW55572 in autobaud mode

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Message-ID: <CACRpkdbOWdNyywooNdr-O-fpksVAwaxOn4Qr9c+oZp0Z8DqCwA@mail.gmail.com>
Date:   Mon, 11 Jul 2022 10:34:29 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Hakan Jansson <hakan.jansson@...ineon.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH v2 5/5] Bluetooth: hci_bcm: Increase host baudrate for
 CYW55572 in autobaud mode

On Thu, Jun 30, 2022 at 2:55 PM Hakan Jansson
<hakan.jansson@...ineon.com> wrote:

> Add device specific data for max baudrate in autobaud mode. This allows the
> host to use a baudrate higher than "init speed" when loading FW in autobaud
> mode.
>
> The device specific max baudrate in autobaud mode for CYW55572 is set to
> 921600 bps. Devices without device specific max baudrate in autobaud mode
> will use init speed as before. If no device specific init speed has been
> specified, it will default to the bcm_proto default 115200 bps.
>
> The increased baud rate improves FW load time. The exact load time will
> depend on the specific system and FW being used. As a rough indication,
> the FW load time dropped from ~9s @ 115.2kbps to ~1.7s @ 921.6kbps in one
> test.
>
> Signed-off-by: Hakan Jansson <hakan.jansson@...ineon.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij