ath9k: Fix AR9285 specific noise floor eeprom reads.

Fix AR9285 specific noise floor reads and initialize tx and rx
chainmask during reset. This along with the following earlier
patches of ath9k fixes an issue with association noticed in
noisy environment.

ath9k: Fix typo in chip version check
ath9k: Remove unnecessary gpio configuration in ath9k_hw_reset()
ath9k: Fix bug in NF calibration
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/calib.c

@@ -105,6 +105,7 @@ static void ath9k_hw_do_getnf(struct ath_hal *ah,
 		"NF calibrated [ctl] [chain 0] is %d\n", nf);
 	nfarray[0] = nf;
 
+	if (!AR_SREV_9285(ah)) {
 		if (AR_SREV_9280_10_OR_LATER(ah))
 			nf = MS(REG_READ(ah, AR_PHY_CH1_CCA),
 					AR9280_PHY_CH1_MINCCA_PWR);
@@ -127,6 +128,7 @@ static void ath9k_hw_do_getnf(struct ath_hal *ah,
 				"NF calibrated [ctl] [chain 2] is %d\n", nf);
 			nfarray[2] = nf;
 		}
+	}
 
 	if (AR_SREV_9280_10_OR_LATER(ah))
 		nf = MS(REG_READ(ah, AR_PHY_EXT_CCA),
@@ -141,6 +143,7 @@ static void ath9k_hw_do_getnf(struct ath_hal *ah,
 		"NF calibrated [ext] [chain 0] is %d\n", nf);
 	nfarray[3] = nf;
 
+	if (!AR_SREV_9285(ah)) {
 		if (AR_SREV_9280_10_OR_LATER(ah))
 			nf = MS(REG_READ(ah, AR_PHY_CH1_EXT_CCA),
 					AR9280_PHY_CH1_EXT_MINCCA_PWR);
@@ -163,6 +166,7 @@ static void ath9k_hw_do_getnf(struct ath_hal *ah,
 				"NF calibrated [ext] [chain 2] is %d\n", nf);
 			nfarray[5] = nf;
 		}
+	}
 }
 
 static bool getNoiseFloorThresh(struct ath_hal *ah,
@@ -668,12 +672,6 @@ int16_t ath9k_hw_getnf(struct ath_hal *ah,
 	int16_t nfarray[NUM_NF_READINGS] = { 0 };
 	struct ath9k_nfcal_hist *h;
 	struct ieee80211_channel *c = chan->chan;
-	u8 chainmask;
-
-	if (AR_SREV_9280(ah))
-		chainmask = 0x1B;
-	else
-		chainmask = 0x3F;
 
 	chan->channelFlags &= (~CHANNEL_CW_INT);
 	if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {

drivers/net/wireless/ath9k/hw.c

@@ -2165,7 +2165,10 @@ int ath9k_hw_reset(struct ath_hal *ah, struct ath9k_channel *chan,
 	ahp->ah_txchainmask = sc->sc_tx_chainmask;
 	ahp->ah_rxchainmask = sc->sc_rx_chainmask;
 
-	if (AR_SREV_9280(ah)) {
+	if (AR_SREV_9285(ah)) {
+		ahp->ah_txchainmask &= 0x1;
+		ahp->ah_rxchainmask &= 0x1;
+	} else if (AR_SREV_9280(ah)) {
 		ahp->ah_txchainmask &= 0x3;
 		ahp->ah_rxchainmask &= 0x3;
 	}