17 files changed, 184 insertions, 188 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index f2eec388693b..73a8014cacb2 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -57,10 +57,11 @@
 #define SUB_NUM_CTL_MODES_AT_5G_40 2    /* excluding HT40, EXT-OFDM */
 #define SUB_NUM_CTL_MODES_AT_2G_40 3    /* excluding HT40, EXT-OFDM, EXT-CCK */
 
+#define CTL(_tpower, _flag) ((_tpower) | ((_flag) << 6))
+
 static int ar9003_hw_power_interpolate(int32_t x,
                                        int32_t *px, int32_t *py, u_int16_t np);
 
-#define CTL(_tpower, _flag) ((_tpower) | ((_flag) << 6))
 
 static const struct ar9300_eeprom ar9300_default = {
         .eepromVersion = 2,
@@ -3032,6 +3033,8 @@ static u32 ath9k_hw_ar9300_get_eeprom(struct ath_hw *ah,
                 return le32_to_cpu(pBase->swreg);
         case EEP_PAPRD:
                 return !!(pBase->featureEnable & BIT(5));
+        case EEP_CHAIN_MASK_REDUCE:
+                return (pBase->miscConfiguration >> 0x3) & 0x1;
         default:
                 return 0;
         }
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
index 656d8ce251a7..b34a9e91edd8 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -487,7 +487,11 @@ void ar9003_hw_set_chain_masks(struct ath_hw *ah, u8 rx, u8 tx)
                 break;
         }
 
-        REG_WRITE(ah, AR_SELFGEN_MASK, tx);
+        if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) && (tx == 0x7))
+                REG_WRITE(ah, AR_SELFGEN_MASK, 0x3);
+        else
+                REG_WRITE(ah, AR_SELFGEN_MASK, tx);
+
         if (tx == 0x5) {
                 REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
                             AR_PHY_SWAP_ALT_CHAIN);
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 0b4b4704b1f0..4210a9306955 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -545,6 +545,7 @@ struct ath_ant_comb {
 #define SC_OP_BT_PRIORITY_DETECTED   BIT(12)
 #define SC_OP_BT_SCAN                BIT(13)
 #define SC_OP_ANI_RUN                BIT(14)
+#define SC_OP_ENABLE_APM             BIT(15)
 
 /* Powersave flags */
 #define PS_WAIT_FOR_BEACON        BIT(0)
@@ -697,6 +698,8 @@ static inline void ath_ahb_exit(void) {};
 void ath9k_ps_wakeup(struct ath_softc *sc);
 void ath9k_ps_restore(struct ath_softc *sc);
 
+u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate);
+
 void ath9k_set_bssid_mask(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
 int ath9k_wiphy_add(struct ath_softc *sc);
 int ath9k_wiphy_del(struct ath_wiphy *aphy);
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 30724a4e8bb2..47bedd82e9a9 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -103,7 +103,8 @@ static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
         memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
         series[0].Tries = 1;
         series[0].Rate = rate;
-        series[0].ChSel = common->tx_chainmask;
+        series[0].ChSel = ath_txchainmask_reduction(sc,
+                        common->tx_chainmask, series[0].Rate);
         series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
         ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
                                      series, 4, 0);
diff --git a/drivers/net/wireless/ath/ath9k/btcoex.c b/drivers/net/wireless/ath/ath9k/btcoex.c
index 6a92e57fddf0..d33bf204c995 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.c
+++ b/drivers/net/wireless/ath/ath9k/btcoex.c
@@ -35,29 +35,6 @@ struct ath_btcoex_config {
         bool bt_hold_rx_clear;
 };
 
-static const u16 ath_subsysid_tbl[] = {
-        AR9280_COEX2WIRE_SUBSYSID,
-        AT9285_COEX3WIRE_SA_SUBSYSID,
-        AT9285_COEX3WIRE_DA_SUBSYSID
-};
-
-/*
- * Checks the subsystem id of the device to see if it
- * supports btcoex
- */
-bool ath9k_hw_btcoex_supported(struct ath_hw *ah)
-{
-        int i;
-
-        if (!ah->hw_version.subsysid)
-                return false;
-
-        for (i = 0; i < ARRAY_SIZE(ath_subsysid_tbl); i++)
-                if (ah->hw_version.subsysid == ath_subsysid_tbl[i])
-                        return true;
-
-        return false;
-}
 
 void ath9k_hw_init_btcoex_hw(struct ath_hw *ah, int qnum)
 {
diff --git a/drivers/net/wireless/ath/ath9k/btcoex.h b/drivers/net/wireless/ath/ath9k/btcoex.h
index 1ee5a15ccbb1..588dfd464dd1 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.h
+++ b/drivers/net/wireless/ath/ath9k/btcoex.h
@@ -49,7 +49,6 @@ struct ath_btcoex_hw {
         u32 bt_coex_mode2;      /* Register setting for AR_BT_COEX_MODE2 */
 };
 
-bool ath9k_hw_btcoex_supported(struct ath_hw *ah);
 void ath9k_hw_btcoex_init_2wire(struct ath_hw *ah);
 void ath9k_hw_btcoex_init_3wire(struct ath_hw *ah);
 void ath9k_hw_init_btcoex_hw(struct ath_hw *ah, int qnum);
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 0c3c74c157fb..3586c43077a7 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -24,8 +24,6 @@
 #define REG_READ_D(_ah, _reg) \
         ath9k_hw_common(_ah)->ops->read((_ah), (_reg))
 
-static struct dentry *ath9k_debugfs_root;
-
 static int ath9k_debugfs_open(struct inode *inode, struct file *file)
 {
         file->private_data = inode->i_private;
@@ -878,11 +876,8 @@ int ath9k_init_debug(struct ath_hw *ah)
         struct ath_common *common = ath9k_hw_common(ah);
         struct ath_softc *sc = (struct ath_softc *) common->priv;
 
-        if (!ath9k_debugfs_root)
-                return -ENOENT;
-
-        sc->debug.debugfs_phy = debugfs_create_dir(wiphy_name(sc->hw->wiphy),
-                                                      ath9k_debugfs_root);
+        sc->debug.debugfs_phy = debugfs_create_dir("ath9k",
+                                                   sc->hw->wiphy->debugfsdir);
         if (!sc->debug.debugfs_phy)
                 return -ENOMEM;
 
@@ -935,29 +930,7 @@ int ath9k_init_debug(struct ath_hw *ah)
         sc->debug.regidx = 0;
         return 0;
 err:
-        ath9k_exit_debug(ah);
-        return -ENOMEM;
-}
-
-void ath9k_exit_debug(struct ath_hw *ah)
-{
-        struct ath_common *common = ath9k_hw_common(ah);
-        struct ath_softc *sc = (struct ath_softc *) common->priv;
-
         debugfs_remove_recursive(sc->debug.debugfs_phy);
-}
-
-int ath9k_debug_create_root(void)
-{
-        ath9k_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
-        if (!ath9k_debugfs_root)
-                return -ENOENT;
-
-        return 0;
-}
-
-void ath9k_debug_remove_root(void)
-{
-        debugfs_remove(ath9k_debugfs_root);
-        ath9k_debugfs_root = NULL;
+        sc->debug.debugfs_phy = NULL;
+        return -ENOMEM;
 }
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index 646ff7e04c88..1e5078bd0344 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -164,10 +164,7 @@ struct ath9k_debug {
 };
 
 int ath9k_init_debug(struct ath_hw *ah);
-void ath9k_exit_debug(struct ath_hw *ah);
 
-int ath9k_debug_create_root(void);
-void ath9k_debug_remove_root(void);
 void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status);
 void ath_debug_stat_tx(struct ath_softc *sc, struct ath_buf *bf,
                        struct ath_tx_status *ts);
@@ -180,19 +177,6 @@ static inline int ath9k_init_debug(struct ath_hw *ah)
         return 0;
 }
 
-static inline void ath9k_exit_debug(struct ath_hw *ah)
-{
-}
-
-static inline int ath9k_debug_create_root(void)
-{
-        return 0;
-}
-
-static inline void ath9k_debug_remove_root(void)
-{
-}
-
 static inline void ath_debug_stat_interrupt(struct ath_softc *sc,
                                             enum ath9k_int status)
 {
diff --git a/drivers/net/wireless/ath/ath9k/eeprom.h b/drivers/net/wireless/ath/ath9k/eeprom.h
index 8a644fced5c9..8b9885b5243f 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom.h
+++ b/drivers/net/wireless/ath/ath9k/eeprom.h
@@ -280,6 +280,7 @@ enum eeprom_param {
         EEP_PAPRD,
         EEP_MODAL_VER,
         EEP_ANT_DIV_CTL1,
+        EEP_CHAIN_MASK_REDUCE
 };
 
 enum ar5416_rates {
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index ae842dbf9b50..8946e8ad1b85 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -363,9 +363,9 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
                                     struct sk_buff *skb)
 {
         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
-        int index = 0, i = 0, chk_idx, len = skb->len;
-        int rx_remain_len = 0, rx_pkt_len = 0;
-        u16 pkt_len, pkt_tag, pool_index = 0;
+        int index = 0, i = 0, len = skb->len;
+        int rx_remain_len, rx_pkt_len;
+        u16 pool_index = 0;
         u8 *ptr;
 
         spin_lock(&hif_dev->rx_lock);
@@ -399,64 +399,64 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
         spin_unlock(&hif_dev->rx_lock);
 
         while (index < len) {
+                u16 pkt_len;
+                u16 pkt_tag;
+                u16 pad_len;
+                int chk_idx;
+
                 ptr = (u8 *) skb->data;
 
                 pkt_len = ptr[index] + (ptr[index+1] << 8);
                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 
-                if (pkt_tag == ATH_USB_RX_STREAM_MODE_TAG) {
-                        u16 pad_len;
-
-                        pad_len = 4 - (pkt_len & 0x3);
-                        if (pad_len == 4)
-                                pad_len = 0;
-
-                        chk_idx = index;
-                        index = index + 4 + pkt_len + pad_len;
-
-                        if (index > MAX_RX_BUF_SIZE) {
-                                spin_lock(&hif_dev->rx_lock);
-                                hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
-                                hif_dev->rx_transfer_len =
-                                        MAX_RX_BUF_SIZE - chk_idx - 4;
-                                hif_dev->rx_pad_len = pad_len;
-
-                                nskb = __dev_alloc_skb(pkt_len + 32,
-                                                       GFP_ATOMIC);
-                                if (!nskb) {
-                                        dev_err(&hif_dev->udev->dev,
-                                        "ath9k_htc: RX memory allocation"
-                                        " error\n");
-                                        spin_unlock(&hif_dev->rx_lock);
-                                        goto err;
-                                }
-                                skb_reserve(nskb, 32);
-                                RX_STAT_INC(skb_allocated);
-
-                                memcpy(nskb->data, &(skb->data[chk_idx+4]),
-                                       hif_dev->rx_transfer_len);
-
-                                /* Record the buffer pointer */
-                                hif_dev->remain_skb = nskb;
+                if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
+                        RX_STAT_INC(skb_dropped);
+                        return;
+                }
+
+                pad_len = 4 - (pkt_len & 0x3);
+                if (pad_len == 4)
+                        pad_len = 0;
+
+                chk_idx = index;
+                index = index + 4 + pkt_len + pad_len;
+
+                if (index > MAX_RX_BUF_SIZE) {
+                        spin_lock(&hif_dev->rx_lock);
+                        hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
+                        hif_dev->rx_transfer_len =
+                                MAX_RX_BUF_SIZE - chk_idx - 4;
+                        hif_dev->rx_pad_len = pad_len;
+
+                        nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
+                        if (!nskb) {
+                                dev_err(&hif_dev->udev->dev,
+                                        "ath9k_htc: RX memory allocation error\n");
                                 spin_unlock(&hif_dev->rx_lock);
-                        } else {
-                                nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
-                                if (!nskb) {
-                                        dev_err(&hif_dev->udev->dev,
-                                        "ath9k_htc: RX memory allocation"
-                                        " error\n");
-                                        goto err;
-                                }
-                                skb_reserve(nskb, 32);
-                                RX_STAT_INC(skb_allocated);
-
-                                memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
-                                skb_put(nskb, pkt_len);
-                                skb_pool[pool_index++] = nskb;
+                                goto err;
                         }
+                        skb_reserve(nskb, 32);
+                        RX_STAT_INC(skb_allocated);
+
+                        memcpy(nskb->data, &(skb->data[chk_idx+4]),
+                               hif_dev->rx_transfer_len);
+
+                        /* Record the buffer pointer */
+                        hif_dev->remain_skb = nskb;
+                        spin_unlock(&hif_dev->rx_lock);
                 } else {
-                        RX_STAT_INC(skb_dropped);
-                        return;
+                        nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
+                        if (!nskb) {
+                                dev_err(&hif_dev->udev->dev,
+                                        "ath9k_htc: RX memory allocation error\n");
+                                goto err;
+                        }
+                        skb_reserve(nskb, 32);
+                        RX_STAT_INC(skb_allocated);
+
+                        memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
+                        skb_put(nskb, pkt_len);
+                        skb_pool[pool_index++] = nskb;
                 }
         }
 
@@ -471,7 +471,7 @@ err:
 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 {
         struct sk_buff *skb = (struct sk_buff *) urb->context;
-        struct hif_device_usb *hif_dev = (struct hif_device_usb *)
+        struct hif_device_usb *hif_dev =
                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
         int ret;
 
@@ -518,7 +518,7 @@ static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 {
         struct sk_buff *skb = (struct sk_buff *) urb->context;
         struct sk_buff *nskb;
-        struct hif_device_usb *hif_dev = (struct hif_device_usb *)
+        struct hif_device_usb *hif_dev =
                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
         int ret;
 
@@ -993,8 +993,7 @@ static void ath9k_hif_usb_reboot(struct usb_device *udev)
 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 {
         struct usb_device *udev = interface_to_usbdev(interface);
-        struct hif_device_usb *hif_dev =
-                (struct hif_device_usb *) usb_get_intfdata(interface);
+        struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
 
         if (hif_dev) {
                 ath9k_htc_hw_deinit(hif_dev->htc_handle,
@@ -1016,8 +1015,7 @@ static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
                                  pm_message_t message)
 {
-        struct hif_device_usb *hif_dev =
-                (struct hif_device_usb *) usb_get_intfdata(interface);
+        struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
 
         ath9k_hif_usb_dealloc_urbs(hif_dev);
 
@@ -1026,8 +1024,7 @@ static int ath9k_hif_usb_suspend(struct usb_interface *interface,
 
 static int ath9k_hif_usb_resume(struct usb_interface *interface)
 {
-        struct hif_device_usb *hif_dev =
-                (struct hif_device_usb *) usb_get_intfdata(interface);
+        struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
         struct htc_target *htc_handle = hif_dev->htc_handle;
         int ret;
 
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index e9761c2c8700..8266ce1f02e3 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -184,6 +184,47 @@ err:
         return ret;
 }
 
+static int ath9k_htc_add_monitor_interface(struct ath9k_htc_priv *priv)
+{
+        struct ath_common *common = ath9k_hw_common(priv->ah);
+        struct ath9k_htc_target_vif hvif;
+        int ret = 0;
+        u8 cmd_rsp;
+
+        if (priv->nvifs > 0)
+                return -ENOBUFS;
+
+        memset(&hvif, 0, sizeof(struct ath9k_htc_target_vif));
+        memcpy(&hvif.myaddr, common->macaddr, ETH_ALEN);
+
+        hvif.opmode = cpu_to_be32(HTC_M_MONITOR);
+        priv->ah->opmode = NL80211_IFTYPE_MONITOR;
+        hvif.index = priv->nvifs;
+
+        WMI_CMD_BUF(WMI_VAP_CREATE_CMDID, &hvif);
+        if (ret)
+                return ret;
+
+        priv->nvifs++;
+        return 0;
+}
+
+static int ath9k_htc_remove_monitor_interface(struct ath9k_htc_priv *priv)
+{
+        struct ath_common *common = ath9k_hw_common(priv->ah);
+        struct ath9k_htc_target_vif hvif;
+        int ret = 0;
+        u8 cmd_rsp;
+
+        memset(&hvif, 0, sizeof(struct ath9k_htc_target_vif));
+        memcpy(&hvif.myaddr, common->macaddr, ETH_ALEN);
+        hvif.index = 0; /* Should do for now */
+        WMI_CMD_BUF(WMI_VAP_REMOVE_CMDID, &hvif);
+        priv->nvifs--;
+
+        return ret;
+}
+
 static int ath9k_htc_add_station(struct ath9k_htc_priv *priv,
                                  struct ieee80211_vif *vif,
                                  struct ieee80211_sta *sta)
@@ -1199,6 +1240,16 @@ static void ath9k_htc_stop(struct ieee80211_hw *hw)
         WMI_CMD(WMI_STOP_RECV_CMDID);
         skb_queue_purge(&priv->tx_queue);
 
+        /* Remove monitor interface here */
+        if (ah->opmode == NL80211_IFTYPE_MONITOR) {
+                if (ath9k_htc_remove_monitor_interface(priv))
+                        ath_print(common, ATH_DBG_FATAL,
+                                  "Unable to remove monitor interface\n");
+                else
+                        ath_print(common, ATH_DBG_CONFIG,
+                                  "Monitor interface removed\n");
+        }
+
         if (ah->btcoex_hw.enabled) {
                 ath9k_hw_btcoex_disable(ah);
                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
@@ -1372,13 +1423,16 @@ static int ath9k_htc_config(struct ieee80211_hw *hw, u32 changed)
                 }
         }
 
-        if (changed & IEEE80211_CONF_CHANGE_MONITOR)
+        if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
                 if (conf->flags & IEEE80211_CONF_MONITOR) {
-                        ath_print(common, ATH_DBG_CONFIG,
-                                  "HW opmode set to Monitor mode\n");
-                        priv->ah->opmode = NL80211_IFTYPE_MONITOR;
+                        if (ath9k_htc_add_monitor_interface(priv))
+                                ath_print(common, ATH_DBG_FATAL,
+                                          "Failed to set monitor mode\n");
+                        else
+                                ath_print(common, ATH_DBG_CONFIG,
+                                          "HW opmode set to Monitor mode\n");
                 }
-
+        }
 
         if (changed & IEEE80211_CONF_CHANGE_IDLE) {
                 mutex_lock(&priv->htc_pm_lock);
diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.h b/drivers/net/wireless/ath/ath9k/htc_hst.h
index 6fc1b21faa5d..ecd018798c47 100644
--- a/drivers/net/wireless/ath/ath9k/htc_hst.h
+++ b/drivers/net/wireless/ath/ath9k/htc_hst.h
@@ -77,20 +77,6 @@ struct htc_config_pipe_msg {
         u8 credits;
 } __packed;
 
-struct htc_packet {
-        void *pktcontext;
-        u8 *buf;
-        u8 *buf_payload;
-        u32 buflen;
-        u32 payload_len;
-
-        int endpoint;
-        int status;
-
-        void *context;
-        u32 reserved;
-};
-
 struct htc_ep_callbacks {
         void *priv;
         void (*tx) (void *, struct sk_buff *, enum htc_endpoint_id, bool txok);
@@ -123,11 +109,6 @@ struct htc_endpoint {
 #define HTC_CONTROL_BUFFER_SIZE \
         (HTC_MAX_CONTROL_MESSAGE_LENGTH + sizeof(struct htc_frame_hdr))
 
-struct htc_control_buf {
-        struct htc_packet htc_pkt;
-        u8 buf[HTC_CONTROL_BUFFER_SIZE];
-};
-
 #define HTC_OP_START_WAIT           BIT(0)
 #define HTC_OP_CONFIG_PIPE_CREDITS  BIT(1)
 
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 380d0c651137..9b1ee7fc05c1 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1925,8 +1925,7 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
         pCap->num_antcfg_2ghz =
                 ah->eep_ops->get_num_ant_config(ah, ATH9K_HAL_FREQ_BAND_2GHZ);
 
-        if (AR_SREV_9280_20_OR_LATER(ah) &&
-            ath9k_hw_btcoex_supported(ah)) {
+        if (AR_SREV_9280_20_OR_LATER(ah) && common->btcoex_enabled) {
                 btcoex_hw->btactive_gpio = ATH_BTACTIVE_GPIO;
                 btcoex_hw->wlanactive_gpio = ATH_WLANACTIVE_GPIO;
 
@@ -1975,6 +1974,12 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
                         if ((ant_div_ctl1 & 0x1) && ((ant_div_ctl1 >> 3) & 0x1))
                                 pCap->hw_caps |= ATH9K_HW_CAP_ANT_DIV_COMB;
                 }
+        if (AR_SREV_9300_20_OR_LATER(ah)) {
+                if (ah->eep_ops->get_eeprom(ah, EEP_CHAIN_MASK_REDUCE))
+                        pCap->hw_caps |= ATH9K_HW_CAP_APM;
+        }
+
+
 
         return 0;
 }
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index cc8f3b9af71f..5fcfa48a45df 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -187,6 +187,7 @@ enum ath9k_hw_caps {
         ATH9K_HW_CAP_ANT_DIV_COMB               = BIT(12),
         ATH9K_HW_CAP_2GHZ                       = BIT(13),
         ATH9K_HW_CAP_5GHZ                       = BIT(14),
+        ATH9K_HW_CAP_APM                        = BIT(15),
 };
 
 struct ath9k_hw_capabilities {
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 84e19e504dd0..918308a28410 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -37,6 +37,10 @@ int led_blink;
 module_param_named(blink, led_blink, int, 0444);
 MODULE_PARM_DESC(blink, "Enable LED blink on activity");
 
+static int ath9k_btcoex_enable;
+module_param_named(btcoex_enable, ath9k_btcoex_enable, int, 0444);
+MODULE_PARM_DESC(btcoex_enable, "Enable wifi-BT coexistence");
+
 /* We use the hw_value as an index into our private channel structure */
 
 #define CHAN2G(_freq, _idx)  { \
@@ -540,6 +544,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
         common->hw = sc->hw;
         common->priv = sc;
         common->debug_mask = ath9k_debug;
+        common->btcoex_enabled = ath9k_btcoex_enable == 1;
         spin_lock_init(&common->cc_lock);
 
         spin_lock_init(&sc->wiphy_lock);
@@ -562,13 +567,6 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
         if (ret)
                 goto err_hw;
 
-        ret = ath9k_init_debug(ah);
-        if (ret) {
-                ath_print(common, ATH_DBG_FATAL,
-                          "Unable to create debugfs files\n");
-                goto err_debug;
-        }
-
         ret = ath9k_init_queues(sc);
         if (ret)
                 goto err_queues;
@@ -591,8 +589,6 @@ err_btcoex:
                 if (ATH_TXQ_SETUP(sc, i))
                         ath_tx_cleanupq(sc, &sc->tx.txq[i]);
 err_queues:
-        ath9k_exit_debug(ah);
-err_debug:
         ath9k_hw_deinit(ah);
 err_hw:
         tasklet_kill(&sc->intr_tq);
@@ -738,6 +734,13 @@ int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid,
         if (error)
                 goto error_register;
 
+        error = ath9k_init_debug(ah);
+        if (error) {
+                ath_print(common, ATH_DBG_FATAL,
+                          "Unable to create debugfs files\n");
+                goto error_world;
+        }
+
         /* Handle world regulatory */
         if (!ath_is_world_regd(reg)) {
                 error = regulatory_hint(hw->wiphy, reg->alpha2);
@@ -796,7 +799,6 @@ static void ath9k_deinit_softc(struct ath_softc *sc)
                 if (ATH_TXQ_SETUP(sc, i))
                         ath_tx_cleanupq(sc, &sc->tx.txq[i]);
 
-        ath9k_exit_debug(sc->sc_ah);
         ath9k_hw_deinit(sc->sc_ah);
 
         tasklet_kill(&sc->intr_tq);
@@ -863,20 +865,12 @@ static int __init ath9k_init(void)
                 goto err_out;
         }
 
-        error = ath9k_debug_create_root();
-        if (error) {
-                printk(KERN_ERR
-                        "ath9k: Unable to create debugfs root: %d\n",
-                        error);
-                goto err_rate_unregister;
-        }
-
         error = ath_pci_init();
         if (error < 0) {
                 printk(KERN_ERR
                         "ath9k: No PCI devices found, driver not installed.\n");
                 error = -ENODEV;
-                goto err_remove_root;
+                goto err_rate_unregister;
         }
 
         error = ath_ahb_init();
@@ -890,8 +884,6 @@ static int __init ath9k_init(void)
  err_pci_exit:
         ath_pci_exit();
 
- err_remove_root:
-        ath9k_debug_remove_root();
  err_rate_unregister:
         ath_rate_control_unregister();
  err_out:
@@ -903,7 +895,6 @@ static void __exit ath9k_exit(void)
 {
         ath_ahb_exit();
         ath_pci_exit();
-        ath9k_debug_remove_root();
         ath_rate_control_unregister();
         printk(KERN_INFO "%s: Driver unloaded\n", dev_info);
 }
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 7acd6b0ca011..f026a031713b 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -553,9 +553,12 @@ void ath_update_chainmask(struct ath_softc *sc, int is_ht)
 static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta)
 {
         struct ath_node *an;
-
+        struct ath_hw *ah = sc->sc_ah;
         an = (struct ath_node *)sta->drv_priv;
 
+        if ((ah->caps.hw_caps) & ATH9K_HW_CAP_APM)
+                sc->sc_flags |= SC_OP_ENABLE_APM;
+
         if (sc->sc_flags & SC_OP_TXAGGR) {
                 ath_tx_node_init(sc, an);
                 an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 495432ec85a9..821d3679c6ff 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -250,11 +250,11 @@ static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
 static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
                              struct sk_buff *skb)
 {
-        struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+        struct ath_frame_info *fi = get_frame_info(skb);
         struct ieee80211_hdr *hdr;
 
         TX_STAT_INC(txq->axq_qnum, a_retries);
-        if (tx_info->control.rates[4].count++ > 0)
+        if (fi->retries++ > 0)
                 return;
 
         hdr = (struct ieee80211_hdr *)skb->data;
@@ -1506,6 +1506,18 @@ static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, int pktlen,
         return duration;
 }
 
+u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate)
+{
+        struct ath_hw *ah = sc->sc_ah;
+        struct ath9k_channel *curchan = ah->curchan;
+        if ((sc->sc_flags & SC_OP_ENABLE_APM) &&
+                        (curchan->channelFlags & CHANNEL_5GHZ) &&
+                        (chainmask == 0x7) && (rate < 0x90))
+                return 0x3;
+        else
+                return chainmask;
+}
+
 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf, int len)
 {
         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -1546,7 +1558,6 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf, int len)
 
                 rix = rates[i].idx;
                 series[i].Tries = rates[i].count;
-                series[i].ChSel = common->tx_chainmask;
 
                 if ((sc->config.ath_aggr_prot && bf_isaggr(bf)) ||
                     (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS)) {
@@ -1569,6 +1580,8 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf, int len)
                 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
                         /* MCS rates */
                         series[i].Rate = rix | 0x80;
+                        series[i].ChSel = ath_txchainmask_reduction(sc,
+                                        common->tx_chainmask, series[i].Rate);
                         series[i].PktDuration = ath_pkt_duration(sc, rix, len,
                                  is_40, is_sgi, is_sp);
                         if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
@@ -1576,7 +1589,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf, int len)
                         continue;
                 }
 
-                /* legcay rates */
+                /* legacy rates */
                 if ((tx_info->band == IEEE80211_BAND_2GHZ) &&
                     !(rate->flags & IEEE80211_RATE_ERP_G))
                         phy = WLAN_RC_PHY_CCK;
@@ -1592,6 +1605,12 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf, int len)
                         is_sp = false;
                 }
 
+                if (bf->bf_state.bfs_paprd)
+                        series[i].ChSel = common->tx_chainmask;
+                else
+                        series[i].ChSel = ath_txchainmask_reduction(sc,
+                                        common->tx_chainmask, series[i].Rate);
+
                 series[i].PktDuration = ath9k_hw_computetxtime(sc->sc_ah,
                         phy, rate->bitrate * 100, len, rix, is_sp);
         }