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Subject: Re: [PATCH v2] rtl8xxxu: Fix wifi low signal strength issue of
 RTL8723BU
From:   Kalle Valo <kvalo@codeaurora.org>
In-Reply-To: <20190704105528.74028-1-chiu@endlessm.com>
References: <20190704105528.74028-1-chiu@endlessm.com>
To:     Chris Chiu <chiu@endlessm.com>
Cc:     jes.sorensen@gmail.com, davem@davemloft.net,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux@endlessm.com
User-Agent: pwcli/0.0.0-git (https://github.com/kvalo/pwcli/) Python/2.7.12
Message-Id: <20190724114415.C579D60388@smtp.codeaurora.org>
Date:   Wed, 24 Jul 2019 11:44:13 +0000 (UTC)
Sender: linux-wireless-owner@vger.kernel.org
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Chris Chiu <chiu@endlessm.com> wrote:

> The WiFi tx power of RTL8723BU is extremely low after booting. So
> the WiFi scan gives very limited AP list and it always fails to
> connect to the selected AP. This module only supports 1x1 antenna
> and the antenna is switched to bluetooth due to some incorrect
> register settings.
> 
> Compare with the vendor driver https://github.com/lwfinger/rtl8723bu,
> we realized that the 8723bu's enable_rf() does the same thing as
> rtw_btcoex_HAL_Initialize() in vendor driver. And it by default
> sets the antenna path to BTC_ANT_PATH_BT which we verified it's
> the cause of the wifi weak tx power. The vendor driver will set
> the antenna path to BTC_ANT_PATH_PTA in the consequent btcoexist
> mechanism, by the function halbtc8723b1ant_PsTdma.
> 
> This commit hand over the antenna control to PTA(Packet Traffic
> Arbitration), which compares the weight of bluetooth/wifi traffic
> then determine whether to continue current wifi traffic or not.
> After PTA take control, The wifi signal will be back to normal and
> the bluetooth scan can also work at the same time. However, the
> btcoexist still needs to be handled under different circumstances.
> If there's a BT connection established, the wifi still fails to
> connect until BT disconnected.
> 
> Signed-off-by: Chris Chiu <chiu@endlessm.com>

Patch applied to wireless-drivers-next.git, thanks.

18e714687bea rtl8xxxu: Fix wifi low signal strength issue of RTL8723BU

-- 
https://patchwork.kernel.org/patch/11031397/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches