wifi: mt76: mt7915: set correct antenna for radar detection on MT7915D

For MT7915D, correct antenna index should be set to let DFS radar
detection work on the 5 GHz band.
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mac.c

@@ -1818,6 +1818,13 @@ static int mt7915_dfs_start_rdd(struct mt7915_dev *dev, int chain)
 	if (err < 0)
 		return err;
 
+	if (is_mt7915(&dev->mt76)) {
+		err = mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_SET_WF_ANT, chain,
+					      0, dev->dbdc_support ? 2 : 0);
+		if (err < 0)
+			return err;
+	}
+
 	return mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_DET_MODE, chain,
 				       MT_RX_SEL0, 1);
 }
@@ -1938,6 +1945,14 @@ int mt7915_dfs_init_radar_detector(struct mt7915_phy *phy)
 	if (err < 0)
 		return err;
 
+	if (is_mt7915(&dev->mt76)) {
+		err = mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_SET_WF_ANT,
+					      phy->band_idx, 0,
+					      dev->dbdc_support ? 2 : 0);
+		if (err < 0)
+			return err;
+	}
+
 	mt7915_dfs_stop_radar_detector(phy);
 	phy->mt76->dfs_state = MT_DFS_STATE_DISABLED;
 

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -357,6 +357,7 @@ enum mt7915_rdd_cmd {
 	RDD_DET_MODE,
 	RDD_RADAR_EMULATE,
 	RDD_START_TXQ = 20,
+	RDD_SET_WF_ANT = 30,
 	RDD_CAC_START = 50,
 	RDD_CAC_END,
 	RDD_NORMAL_START,