linux-kernel - Re: [PATCH v3] rtl8xxxu: add bluetooth co-existence support for single antenna

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Message-ID: <4603f17b-6739-1168-f784-58b0b9cf1a74@gmail.com>
Date:   Tue, 8 Oct 2019 12:00:37 -0400
From:   Jes Sorensen <jes.sorensen@...il.com>
To:     Chris Chiu <chiu@...lessm.com>, kvalo@...eaurora.org,
        davem@...emloft.net
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...lessm.com
Subject: Re: [PATCH v3] rtl8xxxu: add bluetooth co-existence support for
 single antenna

On 10/5/19 5:48 AM, Chris Chiu wrote:
> The RTL8723BU suffers the wifi disconnection problem while bluetooth
> device connected. While wifi is doing tx/rx, the bluetooth will scan
> without results. This is due to the wifi and bluetooth share the same
> single antenna for RF communication and they need to have a mechanism
> to collaborate.
> 
> BT information is provided via the packet sent from co-processor to
> host (C2H). It contains the status of BT but the rtl8723bu_handle_c2h
> dose not really handle it. And there's no bluetooth coexistence
> mechanism to deal with it.
> 
> This commit adds a workqueue to set the tdma configurations and
> coefficient table per the parsed bluetooth link status and given
> wifi connection state. The tdma/coef table comes from the vendor
> driver code of the RTL8192EU and RTL8723BU. However, this commit is
> only for single antenna scenario which RTL8192EU is default dual
> antenna. The rtl8xxxu_parse_rxdesc24 which invokes the handle_c2h
> is only for 8723b and 8192e so the mechanism is expected to work
> on both chips with single antenna. Note RTL8192EU dual antenna is
> not supported.
> 
> Signed-off-by: Chris Chiu <chiu@...lessm.com>
> ---
> 
> Notes:
>    v2:
>     - Add helper functions to replace bunch of tdma settings
>     - Reformat some lines to meet kernel coding style
>    v3:
>     - Add comment for rtl8723bu_set_coex_with_type()

Looks good to me!

Signed-off-by: Jes Sorensen <Jes.Sorensen@...il.com>

Jes