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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
View File

@ -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;

5
drivers/net/wireless/mediatek/mt7601u/mt7601u.h
View File

@ -23,6 +23,7 @@
#include <linux/completion.h>
#include <net/mac80211.h>
#include <linux/debugfs.h>
#include <linux/average.h>
#include "regs.h"
@ -138,6 +139,8 @@ enum {
MT7601U_STATE_MORE_STATS,
};
DECLARE_EWMA(rssi, 10, 4);
/**
* struct mt7601u_dev - adapter structure
* @lock: protects @wcid->tx_rate.
@ -220,7 +223,7 @@ struct mt7601u_dev {
s8 bcn_freq_off;
u8 bcn_phy_mode;
int avg_rssi; /* starts at 0 and converges */
struct ewma_rssi avg_rssi;
u8 agc_save;

10
drivers/net/wireless/mediatek/mt7601u/phy.c
View File

@ -975,6 +975,7 @@ void mt7601u_agc_restore(struct mt7601u_dev *dev)
static void mt7601u_agc_tune(struct mt7601u_dev *dev)
{
u8 val = mt7601u_agc_default(dev);
long avg_rssi;
if (test_bit(MT7601U_STATE_SCANNING, &dev->state))
return;
@ -984,9 +985,12 @@ static void mt7601u_agc_tune(struct mt7601u_dev *dev)
* Rssi updates are only on beacons and U2M so should work...
*/
spin_lock_bh(&dev->con_mon_lock);
if (dev->avg_rssi <= -70)
avg_rssi = ewma_rssi_read(&dev->avg_rssi);
WARN_ON_ONCE(avg_rssi == 0);
avg_rssi = -avg_rssi;
if (avg_rssi <= -70)
val -= 0x20;
else if (dev->avg_rssi <= -60)
else if (avg_rssi <= -60)
val -= 0x10;
spin_unlock_bh(&dev->con_mon_lock);
@ -1102,7 +1106,7 @@ void mt7601u_phy_con_cal_onoff(struct mt7601u_dev *dev,
/* Start/stop collecting beacon data */
spin_lock_bh(&dev->con_mon_lock);
ether_addr_copy(dev->ap_bssid, info->bssid);
dev->avg_rssi = 0;
ewma_rssi_init(&dev->avg_rssi);
dev->bcn_freq_off = MT_FREQ_OFFSET_INVALID;
spin_unlock_bh(&dev->con_mon_lock);