diff --git a/[refs] b/[refs]
index fb664eb91874..a43347d8407a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 72a801103f07182c0a4f3a761caa62b4ab8eb4e5
+refs/heads/master: a9d85fbd3e5f7a0679e6276953cd23ac7bb72789
diff --git a/trunk/drivers/net/wireless/ath/ath9k/ar9003_calib.c b/trunk/drivers/net/wireless/ath/ath9k/ar9003_calib.c
index 9e6edffe0bd1..32eed19ff6f9 100644
--- a/trunk/drivers/net/wireless/ath/ath9k/ar9003_calib.c
+++ b/trunk/drivers/net/wireless/ath/ath9k/ar9003_calib.c
@@ -718,12 +718,19 @@ static bool ar9003_hw_init_cal(struct ath_hw *ah,
 			       struct ath9k_channel *chan)
 {
 	struct ath_common *common = ath9k_hw_common(ah);
+	int val;
 
-	/*
-	 * 0x7 = 0b111 , AR9003 needs to be configured for 3-chain mode before
-	 * running AGC/TxIQ cals
-	 */
-	ar9003_hw_set_chain_masks(ah, 0x7, 0x7);
+	val = REG_READ(ah, AR_ENT_OTP);
+	ath_print(common, ATH_DBG_CALIBRATE, "ath9k: AR_ENT_OTP 0x%x\n", val);
+
+	if (val & AR_ENT_OTP_CHAIN2_DISABLE)
+		ar9003_hw_set_chain_masks(ah, 0x3, 0x3);
+	else
+		/*
+		 * 0x7 = 0b111 , AR9003 needs to be configured for 3-chain
+		 * mode before running AGC/TxIQ cals
+		 */
+		ar9003_hw_set_chain_masks(ah, 0x7, 0x7);
 
 	/* Do Tx IQ Calibration */
 	ar9003_hw_tx_iq_cal(ah);
diff --git a/trunk/drivers/net/wireless/ath/ath9k/reg.h b/trunk/drivers/net/wireless/ath/ath9k/reg.h
index 42976b0a01c1..ac6a13e27352 100644
--- a/trunk/drivers/net/wireless/ath/ath9k/reg.h
+++ b/trunk/drivers/net/wireless/ath/ath9k/reg.h
@@ -1065,6 +1065,8 @@ enum {
 #define AR_INTR_PRIO_ASYNC_MASK   0x40c8
 #define AR_INTR_PRIO_SYNC_MASK    0x40cc
 #define AR_INTR_PRIO_ASYNC_ENABLE 0x40d4
+#define AR_ENT_OTP		  0x40d8
+#define AR_ENT_OTP_CHAIN2_DISABLE               0x00020000
 
 #define AR_RTC_9300_PLL_DIV          0x000003ff
 #define AR_RTC_9300_PLL_DIV_S        0