--- a/drivers/net/wireless/ath/ath9k/ar9002_hw.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
@@ -499,45 +499,6 @@ void ar9002_hw_enable_async_fifo(struct 
 	}
 }
 
-/*
- * If Async FIFO is enabled, the following counters change as MAC now runs
- * at 117 Mhz instead of 88/44MHz when async FIFO is disabled.
- *
- * The values below tested for ht40 2 chain.
- * Overwrite the delay/timeouts initialized in process ini.
- */
-void ar9002_hw_update_async_fifo(struct ath_hw *ah)
-{
-	if (AR_SREV_9287_13_OR_LATER(ah)) {
-		REG_WRITE(ah, AR_D_GBL_IFS_SIFS,
-			  AR_D_GBL_IFS_SIFS_ASYNC_FIFO_DUR);
-		REG_WRITE(ah, AR_D_GBL_IFS_SLOT,
-			  AR_D_GBL_IFS_SLOT_ASYNC_FIFO_DUR);
-		REG_WRITE(ah, AR_D_GBL_IFS_EIFS,
-			  AR_D_GBL_IFS_EIFS_ASYNC_FIFO_DUR);
-
-		REG_WRITE(ah, AR_TIME_OUT, AR_TIME_OUT_ACK_CTS_ASYNC_FIFO_DUR);
-		REG_WRITE(ah, AR_USEC, AR_USEC_ASYNC_FIFO_DUR);
-
-		REG_SET_BIT(ah, AR_MAC_PCU_LOGIC_ANALYZER,
-			    AR_MAC_PCU_LOGIC_ANALYZER_DISBUG20768);
-		REG_RMW_FIELD(ah, AR_AHB_MODE, AR_AHB_CUSTOM_BURST_EN,
-			      AR_AHB_CUSTOM_BURST_ASYNC_FIFO_VAL);
-	}
-}
-
-/*
- * We don't enable WEP aggregation on mac80211 but we keep this
- * around for HAL unification purposes.
- */
-void ar9002_hw_enable_wep_aggregation(struct ath_hw *ah)
-{
-	if (AR_SREV_9287_13_OR_LATER(ah)) {
-		REG_SET_BIT(ah, AR_PCU_MISC_MODE2,
-			    AR_PCU_MISC_MODE2_ENABLE_AGGWEP);
-	}
-}
-
 /* Sets up the AR5008/AR9001/AR9002 hardware familiy callbacks */
 void ar9002_hw_attach_ops(struct ath_hw *ah)
 {
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1641,9 +1641,13 @@ int ath9k_hw_reset(struct ath_hw *ah, st
 
 	ath9k_hw_init_global_settings(ah);
 
-	if (!AR_SREV_9300_20_OR_LATER(ah)) {
-		ar9002_hw_update_async_fifo(ah);
-		ar9002_hw_enable_wep_aggregation(ah);
+	if (AR_SREV_9287(ah) && AR_SREV_9287_13_OR_LATER(ah)) {
+		REG_SET_BIT(ah, AR_MAC_PCU_LOGIC_ANALYZER,
+			    AR_MAC_PCU_LOGIC_ANALYZER_DISBUG20768);
+		REG_RMW_FIELD(ah, AR_AHB_MODE, AR_AHB_CUSTOM_BURST_EN,
+			      AR_AHB_CUSTOM_BURST_ASYNC_FIFO_VAL);
+		REG_SET_BIT(ah, AR_PCU_MISC_MODE2,
+			    AR_PCU_MISC_MODE2_ENABLE_AGGWEP);
 	}
 
 	REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM);
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -984,8 +984,6 @@ void ath9k_hw_get_delta_slope_vals(struc
 void ar9002_hw_cck_chan14_spread(struct ath_hw *ah);
 int ar9002_hw_rf_claim(struct ath_hw *ah);
 void ar9002_hw_enable_async_fifo(struct ath_hw *ah);
-void ar9002_hw_update_async_fifo(struct ath_hw *ah);
-void ar9002_hw_enable_wep_aggregation(struct ath_hw *ah);
 
 /*
  * Code specific to AR9003, we stuff these here to avoid callbacks
--- a/drivers/net/wireless/ath/ath9k/reg.h
+++ b/drivers/net/wireless/ath/ath9k/reg.h
@@ -600,7 +600,6 @@
 
 #define AR_D_GBL_IFS_SIFS         0x1030
 #define AR_D_GBL_IFS_SIFS_M       0x0000FFFF
-#define AR_D_GBL_IFS_SIFS_ASYNC_FIFO_DUR 0x000003AB
 #define AR_D_GBL_IFS_SIFS_RESV0   0xFFFFFFFF
 
 #define AR_D_TXBLK_BASE            0x1038
@@ -616,12 +615,10 @@
 #define AR_D_GBL_IFS_SLOT         0x1070
 #define AR_D_GBL_IFS_SLOT_M       0x0000FFFF
 #define AR_D_GBL_IFS_SLOT_RESV0   0xFFFF0000
-#define AR_D_GBL_IFS_SLOT_ASYNC_FIFO_DUR   0x00000420
 
 #define AR_D_GBL_IFS_EIFS         0x10b0
 #define AR_D_GBL_IFS_EIFS_M       0x0000FFFF
 #define AR_D_GBL_IFS_EIFS_RESV0   0xFFFF0000
-#define AR_D_GBL_IFS_EIFS_ASYNC_FIFO_DUR   0x0000A5EB
 
 #define AR_D_GBL_IFS_MISC        0x10f0
 #define AR_D_GBL_IFS_MISC_LFSR_SLICE_SEL        0x00000007
@@ -1477,7 +1474,6 @@ enum {
 #define AR_TIME_OUT_ACK_S    0
 #define AR_TIME_OUT_CTS      0x3FFF0000
 #define AR_TIME_OUT_CTS_S    16
-#define AR_TIME_OUT_ACK_CTS_ASYNC_FIFO_DUR    0x16001D56
 
 #define AR_RSSI_THR          0x8018
 #define AR_RSSI_THR_MASK     0x000000FF
@@ -1493,7 +1489,6 @@ enum {
 #define AR_USEC_TX_LAT_S     14
 #define AR_USEC_RX_LAT       0x1F800000
 #define AR_USEC_RX_LAT_S     23
-#define AR_USEC_ASYNC_FIFO_DUR    0x12e00074
 
 #define AR_RESET_TSF        0x8020
 #define AR_RESET_TSF_ONCE   0x01000000