rtw88: report RX power for each antenna

Report chains and chain_signal in ieee80211_rx_status.
It is useful for program such as tcpdump to see if the
antennas are well connected/placed.

8822C is able to receive CCK rates with 2 antennas, while
8822B can only use 1 antenna path to receive CCK rates.
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Reviewed-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtw88/rtw8822b.c

@@ -766,6 +766,7 @@ static void query_phy_status_page0(struct rtw_dev *rtwdev, u8 *phy_status,
 	s8 min_rx_power = -120;
 	u8 pwdb = GET_PHY_STAT_P0_PWDB(phy_status);
 
+	/* 8822B uses only 1 antenna to RX CCK rates */
 	pkt_stat->rx_power[RF_PATH_A] = pwdb - 110;
 	pkt_stat->rssi = rtw_phy_rf_power_2_rssi(pkt_stat->rx_power, 1);
 	pkt_stat->bw = RTW_CHANNEL_WIDTH_20;

drivers/net/wireless/realtek/rtw88/rtw8822c.c

@@ -1635,9 +1635,9 @@ static void query_phy_status_page0(struct rtw_dev *rtwdev, u8 *phy_status,
 	rx_power[RF_PATH_A] -= 110;
 	rx_power[RF_PATH_B] -= 110;
 
-	pkt_stat->rx_power[RF_PATH_A] = max3(rx_power[RF_PATH_A],
-					     rx_power[RF_PATH_B],
-					     min_rx_power);
+	pkt_stat->rx_power[RF_PATH_A] = rx_power[RF_PATH_A];
+	pkt_stat->rx_power[RF_PATH_B] = rx_power[RF_PATH_B];
+
 	pkt_stat->rssi = rtw_phy_rf_power_2_rssi(pkt_stat->rx_power, 1);
 	pkt_stat->bw = RTW_CHANNEL_WIDTH_20;
 	pkt_stat->signal_power = max(pkt_stat->rx_power[RF_PATH_A],

drivers/net/wireless/realtek/rtw88/rx.c

@@ -90,6 +90,7 @@ void rtw_rx_fill_rx_status(struct rtw_dev *rtwdev,
 			   u8 *phy_status)
 {
 	struct ieee80211_hw *hw = rtwdev->hw;
+	u8 path;
 
 	memset(rx_status, 0, sizeof(*rx_status));
 	rx_status->freq = hw->conf.chandef.chan->center_freq;
@@ -146,6 +147,10 @@ void rtw_rx_fill_rx_status(struct rtw_dev *rtwdev,
 		rx_status->bw = RATE_INFO_BW_20;
 
 	rx_status->signal = pkt_stat->signal_power;
+	for (path = 0; path < rtwdev->hal.rf_path_num; path++) {
+		rx_status->chains |= BIT(path);
+		rx_status->chain_signal[path] = pkt_stat->rx_power[path];
+	}
 
 	rtw_rx_addr_match(rtwdev, pkt_stat, hdr);
 }