From: Kalle Valo <kvalo@codeaurora.org>
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
Subject: Re: [PATCH v2] rtl8xxxu: Fix wifi low signal strength issue of RTL8723BU
Date: Wed, 24 Jul 2019 11:44:13 +0000 (UTC) [thread overview]
Message-ID: <20190724114415.C579D60388@smtp.codeaurora.org> (raw)
In-Reply-To: <20190704105528.74028-1-chiu@endlessm.com>
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
prev parent reply other threads:[~2019-07-24 11:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-04 10:55 [PATCH v2] rtl8xxxu: Fix wifi low signal strength issue of RTL8723BU Chris Chiu
2019-07-04 16:43 ` Jes Sorensen
2019-07-05 2:27 ` Chris Chiu
2019-07-05 18:24 ` Jes Sorensen
2019-07-12 7:25 ` Daniel Drake
2019-07-05 3:41 ` Daniel Drake
2019-07-05 4:37 ` Chris Chiu
2019-07-24 11:44 ` Kalle Valo [this message]
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