diff --git a/drivers/net/wireless/ath/ath9k/ar9002_hw.c b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
index 5b21e69143868f69ebefe4641db93c09c2a6c486..cf36f646791421bdd4a6c015b02dc23484263c8f 100644
--- a/drivers/net/wireless/ath/ath9k/ar9002_hw.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_hw.c
@@ -526,6 +526,35 @@ int ar9002_hw_rf_claim(struct ath_hw *ah)
 	return 0;
 }
 
+/*
+ * Enable ASYNC FIFO
+ *
+ * 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_enable_async_fifo(struct ath_hw *ah)
+{
+	if (AR_SREV_9287_12_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);
+	}
+}
+
 /* Sets up the AR5008/AR9001/AR9002 hardware familiy callbacks */
 void ar9002_hw_attach_ops(struct ath_hw *ah)
 {
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index fd146c8d4cd837b2f409a481099b6ba7ad34e6f9..1dc1b485c3c38b958f6e5bf561a48416b9d3fe4f 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1265,22 +1265,9 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 
 	ath9k_hw_init_global_settings(ah);
 
-	if (AR_SREV_9287_12_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);
+	if (!AR_SREV_9300_20_OR_LATER(ah))
+		ar9002_hw_enable_async_fifo(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);
-	}
 	if (AR_SREV_9287_12_OR_LATER(ah)) {
 		REG_SET_BIT(ah, AR_PCU_MISC_MODE2,
 				AR_PCU_MISC_MODE2_ENABLE_AGGWEP);
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 16f0f982079606fc3cadbde46780382c33f62411..e4eacdd4c8109160926a288a6be165047d25cca3 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -850,6 +850,7 @@ void ath9k_hw_get_delta_slope_vals(struct ath_hw *ah, u32 coef_scaled,
  */
 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);
 
 /*
  * Code specifric to AR9003, we stuff these here to avoid callbacks