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mt7601u: use EWMA to calculate avg_rssi

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avr_rssi is not calculated correctly as we do not divide result
by 256 (mt76 sum avg_rssi1 and avg_rssi2 and divide by 512).
However dividing by 256 will make avg_rssi almost the same as
last rssi value - not really an average. So use EWMA to calculate
avg_rssi. I've chosen weight_rcp=4 to convergence quicker on signal
strength changes.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Stanislaw Gruszka
2018-04-16 13:56:17 +02:00
committed by Kalle Valo
parent b9e5d4feb4
commit b305a6ab02
3 changed files with 13 additions and 6 deletions
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4
drivers/net/wireless/mediatek/mt7601u/mac.c
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@@ -453,7 +453,7 @@ mt7601u_rx_monitor_beacon(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi,
{
dev->bcn_freq_off = rxwi->freq_off;
dev->bcn_phy_mode = FIELD_GET(MT_RXWI_RATE_PHY, rate);
dev->avg_rssi = (dev->avg_rssi * 15) / 16 + (rssi << 8);
ewma_rssi_add(&dev->avg_rssi, -rssi);
}
static int
@@ -503,7 +503,7 @@ u32 mt76_mac_process_rx(struct mt7601u_dev *dev, struct sk_buff *skb,
if (mt7601u_rx_is_our_beacon(dev, data))
mt7601u_rx_monitor_beacon(dev, rxwi, rate, rssi);
else if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_U2M))
dev->avg_rssi = (dev->avg_rssi * 15) / 16 + (rssi << 8);
ewma_rssi_add(&dev->avg_rssi, -rssi);
spin_unlock_bh(&dev->con_mon_lock);
return len;