wifi: rtw89: 8851b: fix TX path to path A for one RF path chip

For two RF paths chips, we normally set path B as main path by default.
8851B has single one RF path, so set TX path to A and set mapping of
path B to 0.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230330133324.19538-3-pkshih@realtek.com

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

@@ -1161,9 +1161,18 @@ int rtw89_fw_h2c_p2p_act(struct rtw89_dev *rtwdev, struct ieee80211_vif *vif,
 static void __rtw89_fw_h2c_set_tx_path(struct rtw89_dev *rtwdev,
 				       struct sk_buff *skb)
 {
+	const struct rtw89_chip_info *chip = rtwdev->chip;
 	struct rtw89_hal *hal = &rtwdev->hal;
-	u8 ntx_path = hal->antenna_tx ? hal->antenna_tx : RF_B;
-	u8 map_b = hal->antenna_tx == RF_AB ? 1 : 0;
+	u8 ntx_path;
+	u8 map_b;
+
+	if (chip->rf_path_num == 1) {
+		ntx_path = RF_A;
+		map_b = 0;
+	} else {
+		ntx_path = hal->antenna_tx ? hal->antenna_tx : RF_B;
+		map_b = hal->antenna_tx == RF_AB ? 1 : 0;
+	}
 
 	SET_CMC_TBL_NTX_PATH_EN(skb->data, ntx_path);
 	SET_CMC_TBL_PATH_MAP_A(skb->data, 0);