[PATCH] ath9k: fix QCA9561 PA bias

["Thibaut VARÈNE" <hacks+kernel@slashdirt.org>]

ath9k is setting the TX PA DC bias level differently on QCA9561 and
QCA9565 although they have the same radio IP-core, which results in a
very low output power and very low throughput as devices are further
away from the AP (compared to other 2.4GHz APs).

In real life testing, without this patch the 2.4GHz throughput on
Yuncore XD3200 is around 10Mbps sitting next to the AP, and close to
practical maximum with the patch applied.

Tested-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Clemens Hopfer <openwrt@wireloss.net>
Signed-off-by: Thibaut VARÈNE <hacks+kernel@slashdirt.org>
---
 drivers/net/wireless/ath/ath9k/ar9003_eeprom.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index b0a4ca355..8f8682f25 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -3606,9 +3606,10 @@ static void ar9003_hw_xpa_bias_level_apply(struct ath_hw *ah, bool is2ghz)
 	int bias = ar9003_modal_header(ah, is2ghz)->xpaBiasLvl;
 
 	if (AR_SREV_9485(ah) || AR_SREV_9330(ah) || AR_SREV_9340(ah) ||
-	    AR_SREV_9531(ah) || AR_SREV_9561(ah))
+	    AR_SREV_9531(ah))
 		REG_RMW_FIELD(ah, AR_CH0_TOP2, AR_CH0_TOP2_XPABIASLVL, bias);
-	else if (AR_SREV_9462(ah) || AR_SREV_9550(ah) || AR_SREV_9565(ah))
+	else if (AR_SREV_9462(ah) || AR_SREV_9550(ah) || AR_SREV_9561(ah) ||
+		 AR_SREV_9565(ah))
 		REG_RMW_FIELD(ah, AR_CH0_TOP, AR_CH0_TOP_XPABIASLVL, bias);
 	else {
 		REG_RMW_FIELD(ah, AR_CH0_TOP, AR_CH0_TOP_XPABIASLVL, bias);
-- 
2.30.2