[ 086/128] ath9k_hw: fix chain swap setting when setting rx chainmask to 5

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@xxxxxxxxxxx>

commit 24171dd92096fc370b195f3f6bdc0798855dc3f9 upstream.

Chain swapping should only be enabled when the EEPROM chainmask is set to 5,
regardless of what the runtime chainmask is.

Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
[bwh: Backported to 3.2: keep the special case for AR_SREV_9462 here]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath9k/ar9003_phy.c |   25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -543,33 +543,20 @@ static void ar9003_hw_init_bb(struct ath
 
 void ar9003_hw_set_chain_masks(struct ath_hw *ah, u8 rx, u8 tx)
 {
-	switch (rx) {
-	case 0x5:
+	if (ah->caps.tx_chainmask == 5 || ah->caps.rx_chainmask == 5)
 		REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
 			    AR_PHY_SWAP_ALT_CHAIN);
-	case 0x3:
-	case 0x1:
-	case 0x2:
-	case 0x7:
-		REG_WRITE(ah, AR_PHY_RX_CHAINMASK, rx);
-		REG_WRITE(ah, AR_PHY_CAL_CHAINMASK, rx);
-		break;
-	default:
-		break;
-	}
+
+	REG_WRITE(ah, AR_PHY_RX_CHAINMASK, rx);
+	REG_WRITE(ah, AR_PHY_CAL_CHAINMASK, rx);
 
 	if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) && (tx == 0x7))
-		REG_WRITE(ah, AR_SELFGEN_MASK, 0x3);
+		tx = 3;
 	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);
+		tx = 3;
 
-	if (tx == 0x5) {
-		REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
-			    AR_PHY_SWAP_ALT_CHAIN);
-	}
+	REG_WRITE(ah, AR_SELFGEN_MASK, tx);
 }
 
 /*


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