ath9k_hw: disable TX IQ calibration for AR9003

Disable TX IQ calibration, it was prematurely enabled in
previous versions.

Cc: Paul Shaw <Paul.Shaw@Atheros.com>
Cc: Thomas Hammel <Thomas.Hammel@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_calib.c

@@ -755,6 +755,7 @@ static bool ar9003_hw_init_cal(struct ath_hw *ah,
 	}
 
 	/* Do Tx IQ Calibration */
+	if (ah->config.tx_iq_calibration)
 		ar9003_hw_tx_iq_cal(ah);
 
 	/* Revert chainmasks to their original values before NF cal */

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

@@ -385,6 +385,12 @@ static void ath9k_hw_init_config(struct ath_hw *ah)
 
 	ah->config.rx_intr_mitigation = true;
 
+	/*
+	 * Tx IQ Calibration (ah->config.tx_iq_calibration) is only
+	 * used by AR9003, but it is showing reliability issues.
+	 * It will take a while to fix so this is currently disabled.
+	 */
+
 	/*
 	 * We need this for PCI devices only (Cardbus, PCI, miniPCI)
 	 * _and_ if on non-uniprocessor systems (Multiprocessor/HT).

drivers/net/wireless/ath/ath9k/hw.h

@@ -261,6 +261,7 @@ struct ath9k_ops_config {
 #define AR_BASE_FREQ_5GHZ   	4900
 #define AR_SPUR_FEEQ_BOUND_HT40 19
 #define AR_SPUR_FEEQ_BOUND_HT20 10
+	bool tx_iq_calibration; /* Only available for >= AR9003 */
 	int spurmode;
 	u16 spurchans[AR_EEPROM_MODAL_SPURS][2];
 	u8 max_txtrig_level;