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>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.c b/drivers/net/wireless/ath/ath9k/ar9003_mci.c
index 867238f..6155837 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_mci.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mci.c
@@ -1015,9 +1015,14 @@ 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);
@@ -1025,6 +1030,11 @@ 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);
        } 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;