ath9k_hw: fix ar9462 selfgen chainmask

When the 9462 is operating in 2G mode and MCI is enabled then
reduce the selfgen chain mask to chain 1. Otherwise poor performance
was reported at short range at Rx side when COEX is enabled.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_mci.c

@@ -1027,6 +1027,7 @@ void ar9003_mci_2g5g_switch(struct ath_hw *ah, bool force)
 
 		if (!(mci->config & ATH_MCI_CONFIG_DISABLE_OSLA))
 			ar9003_mci_osla_setup(ah, true);
+		REG_WRITE(ah, AR_SELFGEN_MASK, 0x02);
 	} else {
 		ar9003_mci_send_lna_take(ah, true);
 		udelay(5);

drivers/net/wireless/ath/ath9k/ar9003_phy.c

@@ -605,9 +605,6 @@ static void ar9003_hw_set_chain_masks(struct ath_hw *ah, u8 rx, u8 tx)
 
 	if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) && (tx == 0x7))
 		REG_WRITE(ah, AR_SELFGEN_MASK, 0x3);
-	else if (AR_SREV_9462(ah))
-		/* xxx only when MCI support is enabled */
-		REG_WRITE(ah, AR_SELFGEN_MASK, 0x3);
 	else
 		REG_WRITE(ah, AR_SELFGEN_MASK, tx);