From: Felix Fietkau <nbd@openwrt.org>
To: linux-wireless@vger.kernel.org
Cc: linville@tuxdriver.com, lrodriguez@atheros.com
Subject: [PATCH 4/4] ath9k: shorten the calibration interval during strong interference
Date: Mon, 2 Aug 2010 15:53:15 +0200 [thread overview]
Message-ID: <1280757195-9532-4-git-send-email-nbd@openwrt.org> (raw)
In-Reply-To: <1280757195-9532-3-git-send-email-nbd@openwrt.org>
When the noise floor limits are being bypassed because of strong
interference, sensitivity is also reduced.
In order to recover from this as quickly as possible, trigger a
long periodic calibration every second instead of every 30 seconds,
until the NF median is within limits again. This is especially important
if the interference lasts for a while, since it takes multiple clean
NF calibrations to bring the median back to normal.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 1 +
drivers/net/wireless/ath/ath9k/main.c | 9 +++++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 07f26ee..def0cd3 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -423,6 +423,7 @@ int ath_beaconq_config(struct ath_softc *sc);
#define ATH_AP_SHORT_CALINTERVAL 100 /* 100 ms */
#define ATH_ANI_POLLINTERVAL_OLD 100 /* 100 ms */
#define ATH_ANI_POLLINTERVAL_NEW 1000 /* 1000 ms */
+#define ATH_LONG_CALINTERVAL_INT 1000 /* 1000 ms */
#define ATH_LONG_CALINTERVAL 30000 /* 30 seconds */
#define ATH_RESTART_CALINTERVAL 1200000 /* 20 minutes */
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 3caa323..ca80dbb 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -395,7 +395,12 @@ void ath_ani_calibrate(unsigned long data)
bool shortcal = false;
bool aniflag = false;
unsigned int timestamp = jiffies_to_msecs(jiffies);
- u32 cal_interval, short_cal_interval;
+ u32 cal_interval, short_cal_interval, long_cal_interval;
+
+ if (ah->caldata && ah->caldata->nfcal_interference)
+ long_cal_interval = ATH_LONG_CALINTERVAL_INT;
+ else
+ long_cal_interval = ATH_LONG_CALINTERVAL;
short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;
@@ -407,7 +412,7 @@ void ath_ani_calibrate(unsigned long data)
ath9k_ps_wakeup(sc);
/* Long calibration runs independently of short calibration. */
- if ((timestamp - common->ani.longcal_timer) >= ATH_LONG_CALINTERVAL) {
+ if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
longcal = true;
ath_print(common, ATH_DBG_ANI, "longcal @%lu\n", jiffies);
common->ani.longcal_timer = timestamp;
--
1.6.4.2
prev parent reply other threads:[~2010-08-02 13:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-02 13:53 [PATCH 1/4] ath9k: add a separate debug level for stuck beacons Felix Fietkau
2010-08-02 13:53 ` [PATCH 2/4] ath9k_hw: apply the noise floor validation to the median instead of single Felix Fietkau
2010-08-02 13:53 ` [PATCH 3/4] ath9k: use AP beacon miss as a trigger for fast recalibration Felix Fietkau
2010-08-02 13:53 ` Felix Fietkau [this message]
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