rtw89: coex: Add case for scan offload

Turn off coexistence driver control, let firmware can control the
traffic during scan. This prevents potential unexpected behavior of
the BT driver.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220401055043.12512-4-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/coex.c

@@ -3068,7 +3068,17 @@ static void _action_wl_scan(struct rtw89_dev *rtwdev)
 	struct rtw89_btc_wl_info *wl = &btc->cx.wl;
 	struct rtw89_btc_wl_dbcc_info *wl_dinfo = &wl->dbcc_info;
 
-	if (rtwdev->dbcc_en) {
+	if (RTW89_CHK_FW_FEATURE(SCAN_OFFLOAD, &rtwdev->fw)) {
+		_set_ant(rtwdev, NM_EXEC, BTC_PHY_ALL, BTC_ANT_W25G);
+		if (btc->mdinfo.ant.type == BTC_ANT_SHARED)
+			_set_policy(rtwdev, BTC_CXP_OFFE_DEF,
+				    BTC_RSN_NTFY_SCAN_START);
+		else
+			_set_policy(rtwdev, BTC_CXP_OFF_EQ0,
+				    BTC_RSN_NTFY_SCAN_START);
+
+		rtw89_debug(rtwdev, RTW89_DBG_BTC, "[BTC], Scan offload!\n");
+	} else if (rtwdev->dbcc_en) {
 		if (wl_dinfo->real_band[RTW89_PHY_0] != RTW89_BAND_2G &&
 		    wl_dinfo->real_band[RTW89_PHY_1] != RTW89_BAND_2G)
 			_action_wl_5g(rtwdev);