[PATCH] wifi: mt76: connac: fix txpower_cur not being updated

[Lucid Duck <lucid_duck@justthetip.ca>]

The mt76_connac_mcu_set_rate_txpower() function sends TX power settings
to the firmware but never updates phy->txpower_cur. This causes
mt76_get_txpower() to return stale or incorrect values (typically
showing 3 dBm regardless of actual transmit power) when userspace
queries TX power via nl80211.

This affects MT7921 and other connac-based devices. Users observe:
  $ iw dev wlan0 info
  ...
  txpower 3.00 dBm

The firmware receives and applies the correct power level, but the
reported value is wrong because txpower_cur is never set.

Fix by updating phy->txpower_cur after successfully configuring TX
power, matching the behavior of other mt76 drivers like mt7915.

Signed-off-by: Lucid Duck <lucid_duck@justthetip.ca>
---
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 045771228..7cd357419 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
@@ -2251,7 +2251,7 @@ mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy,
 
 int mt76_connac_mcu_set_rate_txpower(struct mt76_phy *phy)
 {
-	int err;
+	int err, tx_power;
 
 	if (phy->cap.has_2ghz) {
 		err = mt76_connac_mcu_rate_txpower_band(phy,
@@ -2272,6 +2272,12 @@ int mt76_connac_mcu_set_rate_txpower(struct mt76_phy *phy)
 			return err;
 	}
 
+	/* Update txpower_cur for accurate reporting via nl80211 */
+	tx_power = 2 * phy->hw->conf.power_level;
+	if (!tx_power)
+		tx_power = 127;
+	phy->txpower_cur = tx_power;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mt76_connac_mcu_set_rate_txpower);
-- 
2.52.0