Chris Chiu <chiu@xxxxxxxxxxxx> 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@xxxxxxxxxxxx> 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
