ath9k: adjust duty cycle for FTP profile for AR9565

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index 19dbac4..0dd2cbb 100644
--- a/drivers/net/wireless/ath/ath9k/mci.c
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -157,7 +157,7 @@
 			 * For single PAN/FTP profile, allocate 35% for BT
 			 * to improve WLAN throughput.
 			 */
-			btcoex->duty_cycle = 35;
+			btcoex->duty_cycle = AR_SREV_9565(sc->sc_ah) ? 40 : 35;
 			btcoex->btcoex_period = 53;
 			ath_dbg(common, MCI,
 				"Single PAN/FTP bt period %d ms dutycycle %d\n",