mt76: fix rssi ewma tracking

The generic EWMA code cannot deal with negative numbers, so convert signal
to a positive number before adding it
Fixes mt76x2 AGC tuning

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index 6242421c..69270c1a 100644
--- a/util.c
+++ b/util.c
@@ -100,7 +100,7 @@ int mt76_get_min_avg_rssi(struct mt76_dev *dev)
 
 			spin_lock(&dev->rx_lock);
 			if (wcid->inactive_count++ < 5)
-				cur_rssi = ewma_signal_read(&wcid->rssi);
+				cur_rssi = -ewma_signal_read(&wcid->rssi);
 			else
 				cur_rssi = 0;
 			spin_unlock(&dev->rx_lock);