mt76: mt7915: update bss_info with cipher after setting the group key

In some cases, the WA firmware needs to know if encryption is used, in order
to set the protection bit of packets
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -367,6 +367,7 @@ static int mt7915_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 			  struct ieee80211_key_conf *key)
 {
 	struct mt7915_dev *dev = mt7915_hw_dev(hw);
+	struct mt7915_phy *phy = mt7915_hw_phy(hw);
 	struct mt7915_vif *mvif = (struct mt7915_vif *)vif->drv_priv;
 	struct mt7915_sta *msta = sta ? (struct mt7915_sta *)sta->drv_priv :
 				  &mvif->sta;
@@ -406,6 +407,11 @@ static int mt7915_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
 	mutex_lock(&dev->mt76.mutex);
 
+	if (cmd == SET_KEY && !sta && !mvif->mt76.cipher) {
+		mvif->mt76.cipher = mt76_connac_mcu_get_cipher(key->cipher);
+		mt7915_mcu_add_bss_info(phy, vif, true);
+	}
+
 	if (cmd == SET_KEY)
 		*wcid_keyidx = idx;
 	else if (idx == *wcid_keyidx)