ath9k_hw: fix LNA control on WLAN sleep

When WLAN enter full sleep mode, WLAN HW should send out a LNA_TAKE
message for BT to take control of the shared LNA. Otherwise BT traffic
is completely stopped whenever the wlan interface is moved full sleep
mode.

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

@@ -1015,16 +1015,26 @@ void ar9003_mci_2g5g_switch(struct ath_hw *ah, bool force)
 		return;
 
 	if (mci->is_2g) {
-		ar9003_mci_send_2g5g_status(ah, true);
+		if (!force) {
+			ar9003_mci_send_2g5g_status(ah, true);
 
-		REG_SET_BIT(ah, AR_MCI_TX_CTRL,
+			ar9003_mci_send_lna_transfer(ah, true);
+			udelay(5);
+		}
+
+		REG_CLR_BIT(ah, AR_MCI_TX_CTRL,
 			    AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);
 		REG_CLR_BIT(ah, AR_PHY_GLB_CONTROL,
 			    AR_BTCOEX_CTRL_BT_OWN_SPDT_CTRL);
 
 		if (!(mci->config & ATH_MCI_CONFIG_DISABLE_OSLA))
 			ar9003_mci_osla_setup(ah, true);
 	} else {
+		if (!force) {
+			ar9003_mci_send_lna_take(ah, true);
+			udelay(5);
+		}
+
 		REG_SET_BIT(ah, AR_MCI_TX_CTRL,
 			    AR_MCI_TX_CTRL_DISABLE_LNA_UPDATE);
 		REG_SET_BIT(ah, AR_PHY_GLB_CONTROL,
@@ -1251,6 +1261,9 @@ void ar9003_mci_bt_gain_ctrl(struct ath_hw *ah)
 
 	ath_dbg(common, MCI, "Give LNA and SPDT control to BT\n");
 
+	ar9003_mci_send_lna_take(ah, true);
+	udelay(50);
+
 	REG_SET_BIT(ah, AR_PHY_GLB_CONTROL, AR_BTCOEX_CTRL_BT_OWN_SPDT_CTRL);
 	mci->is_2g = false;
 	mci->update_2g5g = true;