ath9k: enable ANI to help with noisy environments
This enables Adaptive Noise Immunity (ANI) on ath9k.
ANI is as algorithm designed to minimize the detrimental
effects of time-varying interferences. This should
help with throughput in noisy environments. To use
ANI we re-enable the MIB interrupt. Since ANI works
on a timer and updates the noise floor we take
advantage of this and also report a non-static noise
floor now to mac80211.
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Jouni Malinen <Jouni.Malinen@Atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 2caba44..7472699 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -274,10 +274,12 @@
rx_status->mactime = status->tsf;
rx_status->band = curchan->band;
rx_status->freq = curchan->center_freq;
- rx_status->noise = ATH_DEFAULT_NOISE_FLOOR;
+ rx_status->noise = sc->sc_ani.sc_noise_floor;
rx_status->signal = rx_status->noise + status->rssi;
rx_status->rate_idx = ath_rate2idx(sc, (status->rateKbps / 100));
rx_status->antenna = status->antenna;
+
+ /* XXX Fix me, 64 cannot be the max rssi value, rigure it out */
rx_status->qual = status->rssi * 100 / 64;
if (status->flags & ATH_RX_MIC_ERROR)
@@ -427,6 +429,11 @@
ath_rate_newstate(sc, avp);
/* Update ratectrl about the new state */
ath_rc_node_update(hw, avp->rc_node);
+
+ /* Start ANI */
+ mod_timer(&sc->sc_ani.timer,
+ jiffies + msecs_to_jiffies(ATH_ANI_POLLINTERVAL));
+
} else {
DPRINTF(sc, ATH_DBG_CONFIG,
"%s: Bss Info DISSOC\n", __func__);
@@ -1173,6 +1180,13 @@
return error;
}
+ if (conf->type == NL80211_IFTYPE_AP) {
+ /* TODO: is this a suitable place to start ANI for AP mode? */
+ /* Start ANI */
+ mod_timer(&sc->sc_ani.timer,
+ jiffies + msecs_to_jiffies(ATH_ANI_POLLINTERVAL));
+ }
+
return 0;
}
@@ -1195,6 +1209,8 @@
#ifdef CONFIG_SLOW_ANT_DIV
ath_slow_ant_div_stop(&sc->sc_antdiv);
#endif
+ /* Stop ANI */
+ del_timer_sync(&sc->sc_ani.timer);
/* Update ratectrl */
ath_rate_newstate(sc, avp);