openwrt/package/mac80211/patches/540-ath9k_cycle_counters_cleanup.patch

--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -765,6 +765,8 @@ struct ath_hw {
 	int coarse_low[5];
 	int firpwr[5];
 	enum ath9k_ani_cmd ani_function;
+	struct ath_cycle_counters cc, cc_delta;
+	int32_t listen_time;
 
 	/* Bluetooth coexistance */
 	struct ath_btcoex_hw btcoex_hw;
--- a/drivers/net/wireless/ath/ath9k/ani.c
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -549,47 +549,15 @@ static u8 ath9k_hw_chan_2_clockrate_mhz(
 
 static int32_t ath9k_hw_ani_get_listen_time(struct ath_hw *ah)
 {
-	struct ar5416AniState *aniState;
-	struct ath_common *common = ath9k_hw_common(ah);
-	u32 txFrameCount, rxFrameCount, cycleCount;
-	int32_t listenTime;
-
-	txFrameCount = REG_READ(ah, AR_TFCNT);
-	rxFrameCount = REG_READ(ah, AR_RFCNT);
-	cycleCount = REG_READ(ah, AR_CCCNT);
-
-	aniState = ah->curani;
-	if (aniState->cycleCount == 0 || aniState->cycleCount > cycleCount) {
-		listenTime = 0;
-		ah->stats.ast_ani_lzero++;
-		ath_print(common, ATH_DBG_ANI,
-			  "1st call: aniState->cycleCount=%d\n",
-			  aniState->cycleCount);
-	} else {
-		int32_t ccdelta = cycleCount - aniState->cycleCount;
-		int32_t rfdelta = rxFrameCount - aniState->rxFrameCount;
-		int32_t tfdelta = txFrameCount - aniState->txFrameCount;
-		int32_t clock_rate;
-
-		/*
-		 * convert HW counter values to ms using mode
-		 * specifix clock rate
-		 */
-		clock_rate = ath9k_hw_chan_2_clockrate_mhz(ah) * 1000;;
+	int32_t listen_time;
+	int32_t clock_rate;
 
-		listenTime = (ccdelta - rfdelta - tfdelta) / clock_rate;
+	ath9k_hw_update_cycle_counters(ah);
+	clock_rate = ath9k_hw_chan_2_clockrate_mhz(ah) * 1000;
+	listen_time = ah->listen_time / clock_rate;
+	ah->listen_time = 0;
 
-		ath_print(common, ATH_DBG_ANI,
-			  "cyclecount=%d, rfcount=%d, "
-			  "tfcount=%d, listenTime=%d CLOCK_RATE=%d\n",
-			  ccdelta, rfdelta, tfdelta, listenTime, clock_rate);
-	}
-
-	aniState->cycleCount = cycleCount;
-	aniState->txFrameCount = txFrameCount;
-	aniState->rxFrameCount = rxFrameCount;
-
-	return listenTime;
+	return listen_time;
 }
 
 static void ath9k_ani_reset_old(struct ath_hw *ah, bool is_scanning)
@@ -1041,45 +1009,52 @@ void ath9k_hw_disable_mib_counters(struc
 }
 EXPORT_SYMBOL(ath9k_hw_disable_mib_counters);
 
-u32 ath9k_hw_GetMibCycleCountsPct(struct ath_hw *ah,
-				  u32 *rxc_pcnt,
-				  u32 *rxf_pcnt,
-				  u32 *txf_pcnt)
+void ath9k_hw_update_cycle_counters(struct ath_hw *ah)
 {
-	struct ath_common *common = ath9k_hw_common(ah);
-	static u32 cycles, rx_clear, rx_frame, tx_frame;
-	u32 good = 1;
+	struct ath_cycle_counters cc;
+	bool clear;
 
-	u32 rc = REG_READ(ah, AR_RCCNT);
-	u32 rf = REG_READ(ah, AR_RFCNT);
-	u32 tf = REG_READ(ah, AR_TFCNT);
-	u32 cc = REG_READ(ah, AR_CCCNT);
+	memcpy(&cc, &ah->cc, sizeof(cc));
 
-	if (cycles == 0 || cycles > cc) {
-		ath_print(common, ATH_DBG_ANI,
-			  "cycle counter wrap. ExtBusy = 0\n");
-		good = 0;
-	} else {
-		u32 cc_d = cc - cycles;
-		u32 rc_d = rc - rx_clear;
-		u32 rf_d = rf - rx_frame;
-		u32 tf_d = tf - tx_frame;
-
-		if (cc_d != 0) {
-			*rxc_pcnt = rc_d * 100 / cc_d;
-			*rxf_pcnt = rf_d * 100 / cc_d;
-			*txf_pcnt = tf_d * 100 / cc_d;
-		} else {
-			good = 0;
-		}
-	}
+	/* freeze counters */
+	REG_WRITE(ah, AR_MIBC, AR_MIBC_FMC);
 
-	cycles = cc;
-	rx_frame = rf;
-	rx_clear = rc;
-	tx_frame = tf;
+	ah->cc.cycles = REG_READ(ah, AR_CCCNT);
+	if (ah->cc.cycles < cc.cycles) {
+		clear = true;
+		goto skip;
+	}
+
+	ah->cc.rx_clear = REG_READ(ah, AR_RCCNT);
+	ah->cc.rx_frame = REG_READ(ah, AR_RFCNT);
+	ah->cc.tx_frame = REG_READ(ah, AR_TFCNT);
+
+	/* prevent wraparound */
+	if (ah->cc.cycles & BIT(31))
+		clear = true;
+
+#define CC_DELTA(_field, _reg) ah->cc_delta._field += ah->cc._field - cc._field
+	CC_DELTA(cycles, AR_CCCNT);
+	CC_DELTA(rx_frame, AR_RFCNT);
+	CC_DELTA(rx_clear, AR_RCCNT);
+	CC_DELTA(tx_frame, AR_TFCNT);
+#undef CC_DELTA
+
+	ah->listen_time += (ah->cc.cycles - cc.cycles) -
+		 ((ah->cc.rx_frame - cc.rx_frame) +
+		  (ah->cc.tx_frame - cc.tx_frame));
+
+skip:
+	if (clear) {
+		REG_WRITE(ah, AR_CCCNT, 0);
+		REG_WRITE(ah, AR_RFCNT, 0);
+		REG_WRITE(ah, AR_RCCNT, 0);
+		REG_WRITE(ah, AR_TFCNT, 0);
+		memset(&ah->cc, 0, sizeof(ah->cc));
+	}
 
-	return good;
+	/* unfreeze counters */
+	REG_WRITE(ah, AR_MIBC, 0);
 }
 
 /*
--- a/drivers/net/wireless/ath/ath9k/ani.h
+++ b/drivers/net/wireless/ath/ath9k/ani.h
@@ -93,6 +93,13 @@ struct ath9k_mib_stats {
 	u32 beacons;
 };
 
+struct ath_cycle_counters {
+	u32 cycles;
+	u32 rx_frame;
+	u32 rx_clear;
+	u32 tx_frame;
+};
+
 /* INI default values for ANI registers */
 struct ath9k_ani_default {
 	u16 m1ThreshLow;
@@ -130,9 +137,6 @@ struct ar5416AniState {
 	int32_t rssiThrLow;
 	int32_t rssiThrHigh;
 	u32 noiseFloor;
-	u32 txFrameCount;
-	u32 rxFrameCount;
-	u32 cycleCount;
 	u32 ofdmPhyErrCount;
 	u32 cckPhyErrCount;
 	u32 ofdmPhyErrBase;
@@ -166,8 +170,7 @@ struct ar5416Stats {
 
 void ath9k_enable_mib_counters(struct ath_hw *ah);
 void ath9k_hw_disable_mib_counters(struct ath_hw *ah);
-u32 ath9k_hw_GetMibCycleCountsPct(struct ath_hw *ah, u32 *rxc_pcnt,
-				  u32 *rxf_pcnt, u32 *txf_pcnt);
+void ath9k_hw_update_cycle_counters(struct ath_hw *ah);
 void ath9k_hw_ani_setup(struct ath_hw *ah);
 void ath9k_hw_ani_init(struct ath_hw *ah);
 int ath9k_hw_get_ani_channel_idx(struct ath_hw *ah,
--- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
@@ -1227,8 +1227,7 @@ static bool ar5008_hw_ani_control_old(st
 		  aniState->firstepLevel,
 		  aniState->listenTime);
 	ath_print(common, ATH_DBG_ANI,
-		"cycleCount=%d, ofdmPhyErrCount=%d, cckPhyErrCount=%d\n\n",
-		aniState->cycleCount,
+		"ofdmPhyErrCount=%d, cckPhyErrCount=%d\n\n",
 		aniState->ofdmPhyErrCount,
 		aniState->cckPhyErrCount);
 
@@ -1480,15 +1479,13 @@ static bool ar5008_hw_ani_control_new(st
 
 	ath_print(common, ATH_DBG_ANI,
 		  "ANI parameters: SI=%d, ofdmWS=%s FS=%d "
-		  "MRCcck=%s listenTime=%d CC=%d listen=%d "
+		  "MRCcck=%s listenTime=%d "
 		  "ofdmErrs=%d cckErrs=%d\n",
 		  aniState->spurImmunityLevel,
 		  !aniState->ofdmWeakSigDetectOff ? "on" : "off",
 		  aniState->firstepLevel,
 		  !aniState->mrcCCKOff ? "on" : "off",
 		  aniState->listenTime,
-		  aniState->cycleCount,
-		  aniState->listenTime,
 		  aniState->ofdmPhyErrCount,
 		  aniState->cckPhyErrCount);
 	return true;
@@ -1581,8 +1578,6 @@ static void ar5008_hw_ani_cache_ini_regs
 	aniState->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_NEW;
 	aniState->ofdmWeakSigDetectOff = !ATH9K_ANI_USE_OFDM_WEAK_SIG;
 	aniState->mrcCCKOff = true; /* not available on pre AR9003 */
-
-	aniState->cycleCount = 0;
 }
 
 static void ar5008_hw_set_nf_limits(struct ath_hw *ah)
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -1005,15 +1005,13 @@ static bool ar9003_hw_ani_control(struct
 
 	ath_print(common, ATH_DBG_ANI,
 		  "ANI parameters: SI=%d, ofdmWS=%s FS=%d "
-		  "MRCcck=%s listenTime=%d CC=%d listen=%d "
+		  "MRCcck=%s listenTime=%d "
 		  "ofdmErrs=%d cckErrs=%d\n",
 		  aniState->spurImmunityLevel,
 		  !aniState->ofdmWeakSigDetectOff ? "on" : "off",
 		  aniState->firstepLevel,
 		  !aniState->mrcCCKOff ? "on" : "off",
 		  aniState->listenTime,
-		  aniState->cycleCount,
-		  aniState->listenTime,
 		  aniState->ofdmPhyErrCount,
 		  aniState->cckPhyErrCount);
 	return true;
@@ -1116,8 +1114,6 @@ static void ar9003_hw_ani_cache_ini_regs
 	aniState->firstepLevel = ATH9K_ANI_FIRSTEP_LVL_NEW;
 	aniState->ofdmWeakSigDetectOff = !ATH9K_ANI_USE_OFDM_WEAK_SIG;
 	aniState->mrcCCKOff = !ATH9K_ANI_ENABLE_MRC_CCK;
-
-	aniState->cycleCount = 0;
 }
 
 void ar9003_hw_attach_phy_ops(struct ath_hw *ah)
@@ -1232,7 +1228,7 @@ void ar9003_hw_bb_watchdog_read(struct a
 void ar9003_hw_bb_watchdog_dbg_info(struct ath_hw *ah)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
-	u32 rxc_pcnt = 0, rxf_pcnt = 0, txf_pcnt = 0, status;
+	u32 status;
 
 	if (likely(!(common->debug_mask & ATH_DBG_RESET)))
 		return;
@@ -1261,11 +1257,13 @@ void ar9003_hw_bb_watchdog_dbg_info(stru
 		  "** BB mode: BB_gen_controls=0x%08x **\n",
 		  REG_READ(ah, AR_PHY_GEN_CTRL));
 
-	if (ath9k_hw_GetMibCycleCountsPct(ah, &rxc_pcnt, &rxf_pcnt, &txf_pcnt))
+	ath9k_hw_update_cycle_counters(ah);
+#define PCT(_field) (ah->cc_delta._field * 100 / ah->cc_delta.cycles)
+	if (ah->cc_delta.cycles)
 		ath_print(common, ATH_DBG_RESET,
 			  "** BB busy times: rx_clear=%d%%, "
 			  "rx_frame=%d%%, tx_frame=%d%% **\n",
-			  rxc_pcnt, rxf_pcnt, txf_pcnt);
+			  PCT(rx_clear), PCT(rx_frame), PCT(tx_frame));
 
 	ath_print(common, ATH_DBG_RESET,
 		  "==== BB update: done ====\n\n");