wifi: rtw88: 8812a: Mitigate beacon loss

The RTL8812AU has a reception problem, maybe only in the 5 GHz band.
Sometimes, in some positions, it stops receiving anything even though
the distance to the AP is only ~3 meters and there are no obstacles.
Moving it a few centimeters fixes it.

Switch the initial gain to maximum coverage when there is beacon loss.
This only helps sometimes. This is similar to what the official driver
does.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/203f5043-4fe1-4f35-8b8f-d3b6f44e1fd9@gmail.com

diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c
index de491fb9caadb71b55803968d4d8999eec6a2719..8ed20c89d21638d3a4135d49ac951bce9ac69c0f 100644 (file)
--- a/drivers/net/wireless/realtek/rtw88/phy.c
+++ b/drivers/net/wireless/realtek/rtw88/phy.c
@@ -530,6 +530,13 @@ static void rtw_phy_dig(struct rtw_dev *rtwdev)
         */
        rtw_phy_dig_recorder(dm_info, cur_igi, fa_cnt);
 
+       /* Mitigate beacon loss and connectivity issues, mainly (only?)
+        * in the 5 GHz band
+        */
+       if (rtwdev->chip->id == RTW_CHIP_TYPE_8812A && rtwdev->beacon_loss &&
+           linked && dm_info->total_fa_cnt < DIG_PERF_FA_TH_EXTRA_HIGH)
+               cur_igi = DIG_CVRG_MIN;
+
        if (cur_igi != pre_igi)
                rtw_phy_dig_write(rtwdev, cur_igi);
 }