ath5k: Adaptive Noise Immunity (ANI) Implementation
This is an Adaptive Noise Imunity (ANI) implementation for ath5k. I have looked
at both ath9k and HAL sources (they are nearly the same), and even though i
have implemented some things differently, the basic algorithm is practically
the same, for now. I hope that this can serve as a clean start to improve the
algorithm later.
This also adds a possibility to manually control ANI settings, right now only
thru a debugfs file:
* set lowest sensitivity (=highest noise immunity):
echo sens-low > /sys/kernel/debug/ath5k/phy0/ani
* set highest sensitivity (=lowest noise immunity):
echo sens-high > /sys/kernel/debug/ath5k/phy0/ani
* automatically control immunity (default):
echo ani-on > /sys/kernel/debug/ath5k/phy0/ani
* to see the parameters in use and watch them change:
cat /sys/kernel/debug/ath5k/phy0/ani
Manually setting sensitivity will turn the automatic control off. You can also
control each of the five immunity parameters (noise immunity, spur immunity,
firstep, ofdm weak signal detection, cck weak signal detection) manually thru
the debugfs file.
This is tested on AR5414 and nearly doubles the thruput in a noisy 2GHz band.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
index f578c1e..2785946 100644
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -203,6 +203,7 @@
#define AR5K_TUNE_DEFAULT_TXPOWER 25
#define AR5K_TUNE_TPC_TXPOWER false
#define ATH5K_TUNE_CALIBRATION_INTERVAL_FULL 10000 /* 10 sec */
+#define ATH5K_TUNE_CALIBRATION_INTERVAL_ANI 1000 /* 1 sec */
#define AR5K_INIT_CARR_SENSE_EN 1
@@ -800,9 +801,9 @@
* @AR5K_INT_TXURN: received when we should increase the TX trigger threshold
* We currently do increments on interrupt by
* (AR5K_TUNE_MAX_TX_FIFO_THRES - current_trigger_level) / 2
- * @AR5K_INT_MIB: Indicates the Management Information Base counters should be
- * checked. We should do this with ath5k_hw_update_mib_counters() but
- * it seems we should also then do some noise immunity work.
+ * @AR5K_INT_MIB: Indicates the either Management Information Base counters or
+ * one of the PHY error counters reached the maximum value and should be
+ * read and cleared.
* @AR5K_INT_RXPHY: RX PHY Error
* @AR5K_INT_RXKCM: RX Key cache miss
* @AR5K_INT_SWBA: SoftWare Beacon Alert - indicates its time to send a
@@ -894,6 +895,7 @@
enum ath5k_calibration_mask {
AR5K_CALIBRATION_FULL = 0x01,
AR5K_CALIBRATION_SHORT = 0x02,
+ AR5K_CALIBRATION_ANI = 0x04,
};
/*
@@ -1115,6 +1117,7 @@
/* Calibration timestamp */
unsigned long ah_cal_next_full;
+ unsigned long ah_cal_next_ani;
/* Calibration mask */
u8 ah_cal_mask;