Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 513 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c
new file mode 100644
index 000000000..5214dd7a3
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -0,0 +1,513 @@
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include "hw.h"
+#include "hw-ops.h"
+
+struct ani_ofdm_level_entry {
+	int spur_immunity_level;
+	int fir_step_level;
+	int ofdm_weak_signal_on;
+};
+
+/* values here are relative to the INI */
+
+/*
+ * Legend:
+ *
+ * SI: Spur immunity
+ * FS: FIR Step
+ * WS: OFDM / CCK Weak Signal detection
+ * MRC-CCK: Maximal Ratio Combining for CCK
+ */
+
+static const struct ani_ofdm_level_entry ofdm_level_table[] = {
+	/* SI  FS  WS */
+	{  0,  0,  1  }, /* lvl 0 */
+	{  1,  1,  1  }, /* lvl 1 */
+	{  2,  2,  1  }, /* lvl 2 */
+	{  3,  2,  1  }, /* lvl 3  (default) */
+	{  4,  3,  1  }, /* lvl 4 */
+	{  5,  4,  1  }, /* lvl 5 */
+	{  6,  5,  1  }, /* lvl 6 */
+	{  7,  6,  1  }, /* lvl 7 */
+	{  7,  7,  1  }, /* lvl 8 */
+	{  7,  8,  0  }  /* lvl 9 */
+};
+#define ATH9K_ANI_OFDM_NUM_LEVEL \
+	ARRAY_SIZE(ofdm_level_table)
+#define ATH9K_ANI_OFDM_MAX_LEVEL \
+	(ATH9K_ANI_OFDM_NUM_LEVEL-1)
+#define ATH9K_ANI_OFDM_DEF_LEVEL \
+	3 /* default level - matches the INI settings */
+
+/*
+ * MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
+ * With OFDM for single stream you just add up all antenna inputs, you're
+ * only interested in what you get after FFT. Signal alignment is also not
+ * required for OFDM because any phase difference adds up in the frequency
+ * domain.
+ *
+ * MRC requires extra work for use with CCK. You need to align the antenna
+ * signals from the different antenna before you can add the signals together.
+ * You need alignment of signals as CCK is in time domain, so addition can cancel
+ * your signal completely if phase is 180 degrees (think of adding sine waves).
+ * You also need to remove noise before the addition and this is where ANI
+ * MRC CCK comes into play. One of the antenna inputs may be stronger but
+ * lower SNR, so just adding after alignment can be dangerous.
+ *
+ * Regardless of alignment in time, the antenna signals add constructively after
+ * FFT and improve your reception. For more information:
+ *
+ * http://en.wikipedia.org/wiki/Maximal-ratio_combining
+ */
+
+struct ani_cck_level_entry {
+	int fir_step_level;
+	int mrc_cck_on;
+};
+
+static const struct ani_cck_level_entry cck_level_table[] = {
+	/* FS  MRC-CCK  */
+	{  0,  1  }, /* lvl 0 */
+	{  1,  1  }, /* lvl 1 */
+	{  2,  1  }, /* lvl 2  (default) */
+	{  3,  1  }, /* lvl 3 */
+	{  4,  0  }, /* lvl 4 */
+	{  5,  0  }, /* lvl 5 */
+	{  6,  0  }, /* lvl 6 */
+	{  7,  0  }, /* lvl 7 (only for high rssi) */
+	{  8,  0  }  /* lvl 8 (only for high rssi) */
+};
+
+#define ATH9K_ANI_CCK_NUM_LEVEL \
+	ARRAY_SIZE(cck_level_table)
+#define ATH9K_ANI_CCK_MAX_LEVEL \
+	(ATH9K_ANI_CCK_NUM_LEVEL-1)
+#define ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI \
+	(ATH9K_ANI_CCK_NUM_LEVEL-3)
+#define ATH9K_ANI_CCK_DEF_LEVEL \
+	2 /* default level - matches the INI settings */
+
+static void ath9k_hw_update_mibstats(struct ath_hw *ah,
+				     struct ath9k_mib_stats *stats)
+{
+	u32 addr[5] = {AR_RTS_OK, AR_RTS_FAIL, AR_ACK_FAIL,
+		       AR_FCS_FAIL, AR_BEACON_CNT};
+	u32 data[5];
+
+	REG_READ_MULTI(ah, &addr[0], &data[0], 5);
+	/* AR_RTS_OK */
+	stats->rts_good += data[0];
+	/* AR_RTS_FAIL */
+	stats->rts_bad += data[1];
+	/* AR_ACK_FAIL */
+	stats->ackrcv_bad += data[2];
+	/* AR_FCS_FAIL */
+	stats->fcs_bad += data[3];
+	/* AR_BEACON_CNT */
+	stats->beacons += data[4];
+}
+
+static void ath9k_ani_restart(struct ath_hw *ah)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+
+	aniState->listenTime = 0;
+
+	ENABLE_REGWRITE_BUFFER(ah);
+
+	REG_WRITE(ah, AR_PHY_ERR_1, 0);
+	REG_WRITE(ah, AR_PHY_ERR_2, 0);
+	REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
+	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
+
+	REGWRITE_BUFFER_FLUSH(ah);
+
+	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
+
+	aniState->ofdmPhyErrCount = 0;
+	aniState->cckPhyErrCount = 0;
+}
+
+/* Adjust the OFDM Noise Immunity Level */
+static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel,
+				  bool scan)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+	struct ath_common *common = ath9k_hw_common(ah);
+	const struct ani_ofdm_level_entry *entry_ofdm;
+	const struct ani_cck_level_entry *entry_cck;
+	bool weak_sig;
+
+	ath_dbg(common, ANI, "**** ofdmlevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
+		aniState->ofdmNoiseImmunityLevel,
+		immunityLevel, BEACON_RSSI(ah),
+		ATH9K_ANI_RSSI_THR_LOW,
+		ATH9K_ANI_RSSI_THR_HIGH);
+
+	if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_OFDM_DEF_LEVEL)
+		immunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
+
+	if (!scan)
+		aniState->ofdmNoiseImmunityLevel = immunityLevel;
+
+	entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
+	entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
+
+	if (aniState->spurImmunityLevel != entry_ofdm->spur_immunity_level)
+		ath9k_hw_ani_control(ah,
+				     ATH9K_ANI_SPUR_IMMUNITY_LEVEL,
+				     entry_ofdm->spur_immunity_level);
+
+	if (aniState->firstepLevel != entry_ofdm->fir_step_level &&
+	    entry_ofdm->fir_step_level >= entry_cck->fir_step_level)
+		ath9k_hw_ani_control(ah,
+				     ATH9K_ANI_FIRSTEP_LEVEL,
+				     entry_ofdm->fir_step_level);
+
+	weak_sig = entry_ofdm->ofdm_weak_signal_on;
+	if (ah->opmode == NL80211_IFTYPE_STATION &&
+	    BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_HIGH)
+		weak_sig = true;
+	/*
+	 * Newer chipsets are better at dealing with high PHY error counts -
+	 * keep weak signal detection enabled when no RSSI threshold is
+	 * available to determine if it is needed (mode != STA)
+	 */
+	else if (AR_SREV_9300_20_OR_LATER(ah) &&
+		 ah->opmode != NL80211_IFTYPE_STATION)
+		weak_sig = true;
+
+	/* Older chipsets are more sensitive to high PHY error counts */
+	else if (!AR_SREV_9300_20_OR_LATER(ah) &&
+		 aniState->ofdmNoiseImmunityLevel >= 8)
+		weak_sig = false;
+
+	if (aniState->ofdmWeakSigDetect != weak_sig)
+		ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
+				     weak_sig);
+
+	if (!AR_SREV_9300_20_OR_LATER(ah))
+		return;
+
+	if (aniState->ofdmNoiseImmunityLevel >= ATH9K_ANI_OFDM_DEF_LEVEL) {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI;
+	} else {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
+	}
+}
+
+static void ath9k_hw_ani_ofdm_err_trigger(struct ath_hw *ah)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+
+	if (aniState->ofdmNoiseImmunityLevel < ATH9K_ANI_OFDM_MAX_LEVEL)
+		ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel + 1, false);
+}
+
+/*
+ * Set the ANI settings to match an CCK level.
+ */
+static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel,
+				 bool scan)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+	struct ath_common *common = ath9k_hw_common(ah);
+	const struct ani_ofdm_level_entry *entry_ofdm;
+	const struct ani_cck_level_entry *entry_cck;
+
+	ath_dbg(common, ANI, "**** ccklevel %d=>%d, rssi=%d[lo=%d hi=%d]\n",
+		aniState->cckNoiseImmunityLevel, immunityLevel,
+		BEACON_RSSI(ah), ATH9K_ANI_RSSI_THR_LOW,
+		ATH9K_ANI_RSSI_THR_HIGH);
+
+	if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_CCK_DEF_LEVEL)
+		immunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
+
+	if (ah->opmode == NL80211_IFTYPE_STATION &&
+	    BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_LOW &&
+	    immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
+		immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
+
+	if (!scan)
+		aniState->cckNoiseImmunityLevel = immunityLevel;
+
+	entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
+	entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
+
+	if (aniState->firstepLevel != entry_cck->fir_step_level &&
+	    entry_cck->fir_step_level >= entry_ofdm->fir_step_level)
+		ath9k_hw_ani_control(ah,
+				     ATH9K_ANI_FIRSTEP_LEVEL,
+				     entry_cck->fir_step_level);
+
+	/* Skip MRC CCK for pre AR9003 families */
+	if (!AR_SREV_9300_20_OR_LATER(ah) || AR_SREV_9485(ah) ||
+	    AR_SREV_9565(ah) || AR_SREV_9561(ah))
+		return;
+
+	if (aniState->mrcCCK != entry_cck->mrc_cck_on)
+		ath9k_hw_ani_control(ah,
+				     ATH9K_ANI_MRC_CCK,
+				     entry_cck->mrc_cck_on);
+}
+
+static void ath9k_hw_ani_cck_err_trigger(struct ath_hw *ah)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+
+	if (aniState->cckNoiseImmunityLevel < ATH9K_ANI_CCK_MAX_LEVEL)
+		ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel + 1,
+				     false);
+}
+
+/*
+ * only lower either OFDM or CCK errors per turn
+ * we lower the other one next time
+ */
+static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+
+	/* lower OFDM noise immunity */
+	if (aniState->ofdmNoiseImmunityLevel > 0 &&
+	    (aniState->ofdmsTurn || aniState->cckNoiseImmunityLevel == 0)) {
+		ath9k_hw_set_ofdm_nil(ah, aniState->ofdmNoiseImmunityLevel - 1,
+				      false);
+		return;
+	}
+
+	/* lower CCK noise immunity */
+	if (aniState->cckNoiseImmunityLevel > 0)
+		ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1,
+				     false);
+}
+
+/*
+ * Restore the ANI parameters in the HAL and reset the statistics.
+ * This routine should be called for every hardware reset and for
+ * every channel change.
+ */
+void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+	struct ath9k_channel *chan = ah->curchan;
+	struct ath_common *common = ath9k_hw_common(ah);
+	int ofdm_nil, cck_nil;
+
+	if (!chan)
+		return;
+
+	BUG_ON(aniState == NULL);
+	ah->stats.ast_ani_reset++;
+
+	ofdm_nil = max_t(int, ATH9K_ANI_OFDM_DEF_LEVEL,
+			 aniState->ofdmNoiseImmunityLevel);
+	cck_nil = max_t(int, ATH9K_ANI_CCK_DEF_LEVEL,
+			 aniState->cckNoiseImmunityLevel);
+
+	if (is_scanning ||
+	    (ah->opmode != NL80211_IFTYPE_STATION &&
+	     ah->opmode != NL80211_IFTYPE_ADHOC)) {
+		/*
+		 * If we're scanning or in AP mode, the defaults (ini)
+		 * should be in place. For an AP we assume the historical
+		 * levels for this channel are probably outdated so start
+		 * from defaults instead.
+		 */
+		if (aniState->ofdmNoiseImmunityLevel !=
+		    ATH9K_ANI_OFDM_DEF_LEVEL ||
+		    aniState->cckNoiseImmunityLevel !=
+		    ATH9K_ANI_CCK_DEF_LEVEL) {
+			ath_dbg(common, ANI,
+				"Restore defaults: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
+				ah->opmode,
+				chan->channel,
+				is_scanning,
+				aniState->ofdmNoiseImmunityLevel,
+				aniState->cckNoiseImmunityLevel);
+
+			ofdm_nil = ATH9K_ANI_OFDM_DEF_LEVEL;
+			cck_nil = ATH9K_ANI_CCK_DEF_LEVEL;
+		}
+	} else {
+		/*
+		 * restore historical levels for this channel
+		 */
+		ath_dbg(common, ANI,
+			"Restore history: opmode %u chan %d Mhz is_scanning=%d ofdm:%d cck:%d\n",
+			ah->opmode,
+			chan->channel,
+			is_scanning,
+			aniState->ofdmNoiseImmunityLevel,
+			aniState->cckNoiseImmunityLevel);
+	}
+	ath9k_hw_set_ofdm_nil(ah, ofdm_nil, is_scanning);
+	ath9k_hw_set_cck_nil(ah, cck_nil, is_scanning);
+
+	ath9k_ani_restart(ah);
+}
+
+static bool ath9k_hw_ani_read_counters(struct ath_hw *ah)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ar5416AniState *aniState = &ah->ani;
+	u32 phyCnt1, phyCnt2;
+	int32_t listenTime;
+
+	ath_hw_cycle_counters_update(common);
+	listenTime = ath_hw_get_listen_time(common);
+
+	if (listenTime <= 0) {
+		ah->stats.ast_ani_lneg_or_lzero++;
+		ath9k_ani_restart(ah);
+		return false;
+	}
+
+	aniState->listenTime += listenTime;
+
+	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
+
+	phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
+	phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
+
+	ah->stats.ast_ani_ofdmerrs += phyCnt1 - aniState->ofdmPhyErrCount;
+	aniState->ofdmPhyErrCount = phyCnt1;
+
+	ah->stats.ast_ani_cckerrs += phyCnt2 - aniState->cckPhyErrCount;
+	aniState->cckPhyErrCount = phyCnt2;
+
+	return true;
+}
+
+void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+	struct ar5416AniState *aniState = &ah->ani;
+	struct ath_common *common = ath9k_hw_common(ah);
+	u32 ofdmPhyErrRate, cckPhyErrRate;
+
+	if (!ath9k_hw_ani_read_counters(ah))
+		return;
+
+	ofdmPhyErrRate = aniState->ofdmPhyErrCount * 1000 /
+			 aniState->listenTime;
+	cckPhyErrRate =  aniState->cckPhyErrCount * 1000 /
+			 aniState->listenTime;
+
+	ath_dbg(common, ANI,
+		"listenTime=%d OFDM:%d errs=%d/s CCK:%d errs=%d/s ofdm_turn=%d\n",
+		aniState->listenTime,
+		aniState->ofdmNoiseImmunityLevel,
+		ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
+		cckPhyErrRate, aniState->ofdmsTurn);
+
+	if (aniState->listenTime > ah->aniperiod) {
+		if (cckPhyErrRate < ah->config.cck_trig_low &&
+		    ofdmPhyErrRate < ah->config.ofdm_trig_low) {
+			ath9k_hw_ani_lower_immunity(ah);
+			aniState->ofdmsTurn = !aniState->ofdmsTurn;
+		} else if (ofdmPhyErrRate > ah->config.ofdm_trig_high) {
+			ath9k_hw_ani_ofdm_err_trigger(ah);
+			aniState->ofdmsTurn = false;
+		} else if (cckPhyErrRate > ah->config.cck_trig_high) {
+			ath9k_hw_ani_cck_err_trigger(ah);
+			aniState->ofdmsTurn = true;
+		} else
+			return;
+			
+		ath9k_ani_restart(ah);
+	}
+}
+EXPORT_SYMBOL(ath9k_hw_ani_monitor);
+
+void ath9k_enable_mib_counters(struct ath_hw *ah)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+
+	ath_dbg(common, ANI, "Enable MIB counters\n");
+
+	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
+
+	ENABLE_REGWRITE_BUFFER(ah);
+
+	REG_WRITE(ah, AR_FILT_OFDM, 0);
+	REG_WRITE(ah, AR_FILT_CCK, 0);
+	REG_WRITE(ah, AR_MIBC,
+		  ~(AR_MIBC_COW | AR_MIBC_FMC | AR_MIBC_CMC | AR_MIBC_MCS)
+		  & 0x0f);
+	REG_WRITE(ah, AR_PHY_ERR_MASK_1, AR_PHY_ERR_OFDM_TIMING);
+	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
+
+	REGWRITE_BUFFER_FLUSH(ah);
+}
+
+/* Freeze the MIB counters, get the stats and then clear them */
+void ath9k_hw_disable_mib_counters(struct ath_hw *ah)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+
+	ath_dbg(common, ANI, "Disable MIB counters\n");
+
+	REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
+	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
+	REG_WRITE(ah, AR_MIBC, AR_MIBC_CMC);
+	REG_WRITE(ah, AR_FILT_OFDM, 0);
+	REG_WRITE(ah, AR_FILT_CCK, 0);
+}
+EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
+
+void ath9k_hw_ani_init(struct ath_hw *ah)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ar5416AniState *ani = &ah->ani;
+
+	ath_dbg(common, ANI, "Initialize ANI\n");
+
+	if (AR_SREV_9300_20_OR_LATER(ah)) {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
+		ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH;
+		ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW;
+	} else {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
+		ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
+		ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
+	}
+
+	ani->spurImmunityLevel = ATH9K_ANI_SPUR_IMMUNE_LVL;
+	ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL;
+	ani->mrcCCK = AR_SREV_9300_20_OR_LATER(ah) ? true : false;
+	ani->ofdmsTurn = true;
+	ani->ofdmWeakSigDetect = true;
+	ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
+	ani->ofdmNoiseImmunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
+
+	/*
+	 * since we expect some ongoing maintenance on the tables, let's sanity
+	 * check here default level should not modify INI setting.
+	 */
+	ah->aniperiod = ATH9K_ANI_PERIOD;
+	ah->config.ani_poll_interval = ATH9K_ANI_POLLINTERVAL;
+
+	ath9k_ani_restart(ah);
+	ath9k_enable_mib_counters(ah);
+}