ath9k: use REG_RMW and rmw buffer in ath9k_hw_4k_set_board_values

replace REG_WRITE to REG_RMW and place every thing in one
RMW buffer.
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath9k/eeprom_4k.c

@@ -1037,17 +1037,17 @@ static void ath9k_hw_4k_set_board_values(struct ath_hw *ah,
 	}
 	REG_RMW_BUFFER_FLUSH(ah);
 
-
+	ENABLE_REG_RMW_BUFFER(ah);
 	REG_RMW_FIELD(ah, AR_PHY_SETTLING, AR_PHY_SETTLING_SWITCH,
 		      pModal->switchSettling);
 	REG_RMW_FIELD(ah, AR_PHY_DESIRED_SZ, AR_PHY_DESIRED_SZ_ADC,
 		      pModal->adcDesiredSize);
 
-	REG_WRITE(ah, AR_PHY_RF_CTL4,
-		  SM(pModal->txEndToXpaOff, AR_PHY_RF_CTL4_TX_END_XPAA_OFF) |
-		  SM(pModal->txEndToXpaOff, AR_PHY_RF_CTL4_TX_END_XPAB_OFF) |
-		  SM(pModal->txFrameToXpaOn, AR_PHY_RF_CTL4_FRAME_XPAA_ON)  |
-		  SM(pModal->txFrameToXpaOn, AR_PHY_RF_CTL4_FRAME_XPAB_ON));
+	REG_RMW(ah, AR_PHY_RF_CTL4,
+		SM(pModal->txEndToXpaOff, AR_PHY_RF_CTL4_TX_END_XPAA_OFF) |
+		SM(pModal->txEndToXpaOff, AR_PHY_RF_CTL4_TX_END_XPAB_OFF) |
+		SM(pModal->txFrameToXpaOn, AR_PHY_RF_CTL4_FRAME_XPAA_ON)  |
+		SM(pModal->txFrameToXpaOn, AR_PHY_RF_CTL4_FRAME_XPAB_ON), 0);
 
 	REG_RMW_FIELD(ah, AR_PHY_RF_CTL3, AR_PHY_TX_END_TO_A2_RX_ON,
 		      pModal->txEndToRxOn);
@@ -1076,6 +1076,8 @@ static void ath9k_hw_4k_set_board_values(struct ath_hw *ah,
 				      pModal->swSettleHt40);
 	}
 
+	REG_RMW_BUFFER_FLUSH(ah);
+
 	bb_desired_scale = (pModal->bb_scale_smrt_antenna &
 			EEP_4K_BB_DESIRED_SCALE_MASK);
 	if ((pBase->txGainType == 0) && (bb_desired_scale != 0)) {