10 files changed, 402 insertions, 7 deletions

diff --git a/drivers/net/wireless/ath/ath9k/Makefile b/drivers/net/wireless/ath/ath9k/Makefile
index 36ed3c46fec6..49d3f25f509d 100644
--- a/drivers/net/wireless/ath/ath9k/Makefile
+++ b/drivers/net/wireless/ath/ath9k/Makefile
@@ -4,6 +4,7 @@ ath9k-y +=	beacon.o \
                 main.o \
                 recv.o \
                 xmit.o \
+                mci.o \
 
 ath9k-$(CONFIG_ATH9K_RATE_CONTROL) += rc.o
 ath9k-$(CONFIG_ATH9K_PCI) += pci.o
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 1c269f50822b..4415e89bd3d9 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -25,6 +25,7 @@
 
 #include "debug.h"
 #include "common.h"
+#include "mci.h"
 
 /*
  * Header for the ath9k.ko driver core *only* -- hw code nor any other driver
@@ -443,7 +444,9 @@ struct ath_btcoex {
         u32 btcoex_no_stomp; /* in usec */
         u32 btcoex_period; /* in usec */
         u32 btscan_no_stomp; /* in usec */
+        u32 duty_cycle;
         struct ath_gen_timer *no_stomp_timer; /* Timer for no BT stomping */
+        struct ath_mci_profile mci;
 };
 
 int ath_init_btcoex_timer(struct ath_softc *sc);
diff --git a/drivers/net/wireless/ath/ath9k/gpio.c b/drivers/net/wireless/ath/ath9k/gpio.c
index 655576c8fdab..2c279dcaf4ba 100644
--- a/drivers/net/wireless/ath/ath9k/gpio.c
+++ b/drivers/net/wireless/ath/ath9k/gpio.c
@@ -189,8 +189,8 @@ static void ath_btcoex_period_timer(unsigned long data)
         bool is_btscan;
 
         ath9k_ps_wakeup(sc);
-        ath_detect_bt_priority(sc);
-
+        if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
+                ath_detect_bt_priority(sc);
         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 
         spin_lock_bh(&btcoex->btcoex_lock);
@@ -212,8 +212,9 @@ static void ath_btcoex_period_timer(unsigned long data)
         }
 
         ath9k_ps_restore(sc);
+        timer_period = btcoex->btcoex_period / 1000;
         mod_timer(&btcoex->period_timer, jiffies +
-                                  msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
+                                  msecs_to_jiffies(timer_period));
 }
 
 /*
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index e1dc084eac5b..96b8b9914da1 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2331,7 +2331,7 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
                         ah->enabled_cals |= TX_IQ_ON_AGC_CAL;
         }
         if (AR_SREV_9462(ah))
-                pCap->hw_caps |= ATH9K_HW_CAP_RTT;
+                pCap->hw_caps |= ATH9K_HW_CAP_RTT | ATH9K_HW_CAP_MCI;
 
         return 0;
 }
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index f389b3c93cf3..33e8f2f9d425 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -203,6 +203,7 @@ enum ath9k_hw_caps {
         ATH9K_HW_CAP_5GHZ                       = BIT(14),
         ATH9K_HW_CAP_APM                        = BIT(15),
         ATH9K_HW_CAP_RTT                        = BIT(16),
+        ATH9K_HW_CAP_MCI                        = BIT(17),
 };
 
 struct ath9k_hw_capabilities {
@@ -419,6 +420,16 @@ enum ath9k_rx_qtype {
         ATH9K_RX_QUEUE_MAX,
 };
 
+enum ath_mci_gpm_coex_profile_type {
+        MCI_GPM_COEX_PROFILE_UNKNOWN,
+        MCI_GPM_COEX_PROFILE_RFCOMM,
+        MCI_GPM_COEX_PROFILE_A2DP,
+        MCI_GPM_COEX_PROFILE_HID,
+        MCI_GPM_COEX_PROFILE_BNEP,
+        MCI_GPM_COEX_PROFILE_VOICE,
+        MCI_GPM_COEX_PROFILE_MAX
+};
+
 struct ath9k_beacon_state {
         u32 bs_nexttbtt;
         u32 bs_nextdtim;
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index af1b32549531..e8af5821a963 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -423,6 +423,8 @@ static int ath9k_init_btcoex(struct ath_softc *sc)
                 txq = sc->tx.txq_map[WME_AC_BE];
                 ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
                 sc->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
+                sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
+                INIT_LIST_HEAD(&sc->btcoex.mci.info);
                 break;
         default:
                 WARN_ON(1);
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 93fbe6f40898..e1e006d81f73 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1133,8 +1133,9 @@ static int ath9k_start(struct ieee80211_hw *hw)
 
         if ((ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) &&
             !ah->btcoex_hw.enabled) {
-                ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
-                                           AR_STOMP_LOW_WLAN_WGHT);
+                if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
+                        ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
+                                                   AR_STOMP_LOW_WLAN_WGHT);
                 ath9k_hw_btcoex_enable(ah);
 
                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
@@ -1237,6 +1238,7 @@ static void ath9k_stop(struct ieee80211_hw *hw)
                 ath9k_hw_btcoex_disable(ah);
                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
                         ath9k_btcoex_timer_pause(sc);
+                ath_mci_flush_profile(&sc->btcoex.mci);
         }
 
         spin_lock_bh(&sc->sc_pcu_lock);
diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
new file mode 100644
index 000000000000..0fbb141bc302
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2010-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "ath9k.h"
+#include "mci.h"
+
+u8 ath_mci_duty_cycle[] = { 0, 50, 60, 70, 80, 85, 90, 95, 98 };
+
+static struct ath_mci_profile_info*
+ath_mci_find_profile(struct ath_mci_profile *mci,
+                     struct ath_mci_profile_info *info)
+{
+        struct ath_mci_profile_info *entry;
+
+        list_for_each_entry(entry, &mci->info, list) {
+                if (entry->conn_handle == info->conn_handle)
+                        break;
+        }
+        return entry;
+}
+
+static bool ath_mci_add_profile(struct ath_common *common,
+                                struct ath_mci_profile *mci,
+                                struct ath_mci_profile_info *info)
+{
+        struct ath_mci_profile_info *entry;
+
+        if ((mci->num_sco == ATH_MCI_MAX_SCO_PROFILE) &&
+            (info->type == MCI_GPM_COEX_PROFILE_VOICE)) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Too many SCO profile, failed to add new profile\n");
+                return false;
+        }
+
+        if (((NUM_PROF(mci) - mci->num_sco) == ATH_MCI_MAX_ACL_PROFILE) &&
+            (info->type != MCI_GPM_COEX_PROFILE_VOICE)) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Too many ACL profile, failed to add new profile\n");
+                return false;
+        }
+
+        entry = ath_mci_find_profile(mci, info);
+
+        if (entry)
+                memcpy(entry, info, 10);
+        else {
+                entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+                if (!entry)
+                        return false;
+
+                memcpy(entry, info, 10);
+                INC_PROF(mci, info);
+                list_add_tail(&info->list, &mci->info);
+        }
+        return true;
+}
+
+static void ath_mci_del_profile(struct ath_common *common,
+                                struct ath_mci_profile *mci,
+                                struct ath_mci_profile_info *info)
+{
+        struct ath_mci_profile_info *entry;
+
+        entry = ath_mci_find_profile(mci, info);
+
+        if (!entry) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Profile to be deleted not found\n");
+                return;
+        }
+        DEC_PROF(mci, entry);
+        list_del(&entry->list);
+        kfree(entry);
+}
+
+void ath_mci_flush_profile(struct ath_mci_profile *mci)
+{
+        struct ath_mci_profile_info *info, *tinfo;
+
+        list_for_each_entry_safe(info, tinfo, &mci->info, list) {
+                list_del(&info->list);
+                DEC_PROF(mci, info);
+                kfree(info);
+        }
+        mci->aggr_limit = 0;
+}
+
+static void ath_mci_adjust_aggr_limit(struct ath_btcoex *btcoex)
+{
+        struct ath_mci_profile *mci = &btcoex->mci;
+        u32 wlan_airtime = btcoex->btcoex_period *
+                                (100 - btcoex->duty_cycle) / 100;
+
+        /*
+         * Scale: wlan_airtime is in ms, aggr_limit is in 0.25 ms.
+         * When wlan_airtime is less than 4ms, aggregation limit has to be
+         * adjusted half of wlan_airtime to ensure that the aggregation can fit
+         * without collision with BT traffic.
+         */
+        if ((wlan_airtime <= 4) &&
+            (!mci->aggr_limit || (mci->aggr_limit > (2 * wlan_airtime))))
+                mci->aggr_limit = 2 * wlan_airtime;
+}
+
+static void ath_mci_update_scheme(struct ath_softc *sc)
+{
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        struct ath_btcoex *btcoex = &sc->btcoex;
+        struct ath_mci_profile *mci = &btcoex->mci;
+        struct ath_mci_profile_info *info;
+        u32 num_profile = NUM_PROF(mci);
+
+        if (num_profile == 1) {
+                info = list_first_entry(&mci->info,
+                                        struct ath_mci_profile_info,
+                                        list);
+                if (mci->num_sco && info->T == 12) {
+                        mci->aggr_limit = 8;
+                        ath_dbg(common, ATH_DBG_MCI,
+                                "Single SCO, aggregation limit 2 ms\n");
+                } else if ((info->type == MCI_GPM_COEX_PROFILE_BNEP) &&
+                           !info->master) {
+                        btcoex->btcoex_period = 60;
+                        ath_dbg(common, ATH_DBG_MCI,
+                                "Single slave PAN/FTP, bt period 60 ms\n");
+                } else if ((info->type == MCI_GPM_COEX_PROFILE_HID) &&
+                         (info->T > 0 && info->T < 50) &&
+                         (info->A > 1 || info->W > 1)) {
+                        btcoex->duty_cycle = 30;
+                        mci->aggr_limit = 8;
+                        ath_dbg(common, ATH_DBG_MCI,
+                                "Multiple attempt/timeout single HID "
+                                "aggregation limit 2 ms dutycycle 30%%\n");
+                }
+        } else if ((num_profile == 2) && (mci->num_hid == 2)) {
+                btcoex->duty_cycle = 30;
+                mci->aggr_limit = 8;
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Two HIDs aggregation limit 2 ms dutycycle 30%%\n");
+        } else if (num_profile > 3) {
+                mci->aggr_limit = 6;
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Three or more profiles aggregation limit 1.5 ms\n");
+        }
+
+        if (IS_CHAN_2GHZ(sc->sc_ah->curchan)) {
+                if (IS_CHAN_HT(sc->sc_ah->curchan))
+                        ath_mci_adjust_aggr_limit(btcoex);
+                else
+                        btcoex->btcoex_period >>= 1;
+        }
+
+        ath9k_hw_btcoex_disable(sc->sc_ah);
+        ath9k_btcoex_timer_pause(sc);
+
+        if (IS_CHAN_5GHZ(sc->sc_ah->curchan))
+                return;
+
+        btcoex->duty_cycle += (mci->num_bdr ? ATH_MCI_MAX_DUTY_CYCLE : 0);
+        if (btcoex->duty_cycle > ATH_MCI_MAX_DUTY_CYCLE)
+                btcoex->duty_cycle = ATH_MCI_MAX_DUTY_CYCLE;
+
+        btcoex->btcoex_period *= 1000;
+        btcoex->btcoex_no_stomp =  btcoex->btcoex_period *
+                                        (100 - btcoex->duty_cycle) / 100;
+
+        ath9k_hw_btcoex_enable(sc->sc_ah);
+        ath9k_btcoex_timer_resume(sc);
+}
+
+void ath_mci_process_profile(struct ath_softc *sc,
+                             struct ath_mci_profile_info *info)
+{
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        struct ath_btcoex *btcoex = &sc->btcoex;
+        struct ath_mci_profile *mci = &btcoex->mci;
+
+        if (info->start) {
+                if (!ath_mci_add_profile(common, mci, info))
+                        return;
+        } else
+                ath_mci_del_profile(common, mci, info);
+
+        btcoex->btcoex_period = ATH_MCI_DEF_BT_PERIOD;
+        mci->aggr_limit = mci->num_sco ? 6 : 0;
+        if (NUM_PROF(mci)) {
+                btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
+                btcoex->duty_cycle = ath_mci_duty_cycle[NUM_PROF(mci)];
+        } else {
+                btcoex->bt_stomp_type = mci->num_mgmt ? ATH_BTCOEX_STOMP_ALL :
+                                                        ATH_BTCOEX_STOMP_LOW;
+                btcoex->duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
+        }
+
+        ath_mci_update_scheme(sc);
+}
+
+void ath_mci_process_status(struct ath_softc *sc,
+                            struct ath_mci_profile_status *status)
+{
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        struct ath_btcoex *btcoex = &sc->btcoex;
+        struct ath_mci_profile *mci = &btcoex->mci;
+        struct ath_mci_profile_info info;
+        int i = 0, old_num_mgmt = mci->num_mgmt;
+
+        /* Link status type are not handled */
+        if (status->is_link) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Skip link type status update\n");
+                return;
+        }
+
+        memset(&info, 0, sizeof(struct ath_mci_profile_info));
+
+        info.conn_handle = status->conn_handle;
+        if (ath_mci_find_profile(mci, &info)) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Skip non link state update for existing profile %d\n",
+                        status->conn_handle);
+                return;
+        }
+        if (status->conn_handle >= ATH_MCI_MAX_PROFILE) {
+                ath_dbg(common, ATH_DBG_MCI,
+                        "Ignore too many non-link update\n");
+                return;
+        }
+        if (status->is_critical)
+                __set_bit(status->conn_handle, mci->status);
+        else
+                __clear_bit(status->conn_handle, mci->status);
+
+        mci->num_mgmt = 0;
+        do {
+                if (test_bit(i, mci->status))
+                        mci->num_mgmt++;
+        } while (++i < ATH_MCI_MAX_PROFILE);
+
+        if (old_num_mgmt != mci->num_mgmt)
+                ath_mci_update_scheme(sc);
+}
diff --git a/drivers/net/wireless/ath/ath9k/mci.h b/drivers/net/wireless/ath/ath9k/mci.h
new file mode 100644
index 000000000000..9590c61822d1
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/mci.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2010-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef MCI_H
+#define MCI_H
+
+#define ATH_MCI_DEF_BT_PERIOD           40
+#define ATH_MCI_BDR_DUTY_CYCLE          20
+#define ATH_MCI_MAX_DUTY_CYCLE          90
+
+#define ATH_MCI_DEF_AGGR_LIMIT          6 /* in 0.24 ms */
+#define ATH_MCI_MAX_ACL_PROFILE         7
+#define ATH_MCI_MAX_SCO_PROFILE         1
+#define ATH_MCI_MAX_PROFILE             (ATH_MCI_MAX_ACL_PROFILE +\
+                                         ATH_MCI_MAX_SCO_PROFILE)
+
+#define INC_PROF(_mci, _info) do {               \
+                switch (_info->type) {           \
+                case MCI_GPM_COEX_PROFILE_RFCOMM:\
+                        _mci->num_other_acl++;   \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_A2DP:  \
+                        _mci->num_a2dp++;        \
+                        if (!_info->edr)         \
+                                _mci->num_bdr++; \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_HID:   \
+                        _mci->num_hid++;         \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_BNEP:  \
+                        _mci->num_pan++;         \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_VOICE: \
+                        _mci->num_sco++;         \
+                        break;                   \
+                default:                         \
+                        break;                   \
+                }                                \
+        } while (0)
+
+#define DEC_PROF(_mci, _info) do {               \
+                switch (_info->type) {           \
+                case MCI_GPM_COEX_PROFILE_RFCOMM:\
+                        _mci->num_other_acl--;   \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_A2DP:  \
+                        _mci->num_a2dp--;        \
+                        if (!_info->edr)         \
+                                _mci->num_bdr--; \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_HID:   \
+                        _mci->num_hid--;         \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_BNEP:  \
+                        _mci->num_pan--;         \
+                        break;                   \
+                case MCI_GPM_COEX_PROFILE_VOICE: \
+                        _mci->num_sco--;         \
+                        break;                   \
+                default:                         \
+                        break;                   \
+                }                                \
+        } while (0)
+
+#define NUM_PROF(_mci)  (_mci->num_other_acl + _mci->num_a2dp + \
+                         _mci->num_hid + _mci->num_pan + _mci->num_sco)
+
+struct ath_mci_profile_info {
+        u8 type;
+        u8 conn_handle;
+        bool start;
+        bool master;
+        bool edr;
+        u8 voice_type;
+        u16 T;          /* Voice: Tvoice, HID: Tsniff,        in slots */
+        u8 W;           /* Voice: Wvoice, HID: Sniff timeout, in slots */
+        u8 A;           /*                HID: Sniff attempt, in slots */
+        struct list_head list;
+};
+
+struct ath_mci_profile_status {
+        bool is_critical;
+        bool is_link;
+        u8 conn_handle;
+};
+
+struct ath_mci_profile {
+        struct list_head info;
+        DECLARE_BITMAP(status, ATH_MCI_MAX_PROFILE);
+        u16 aggr_limit;
+        u8 num_mgmt;
+        u8 num_sco;
+        u8 num_a2dp;
+        u8 num_hid;
+        u8 num_pan;
+        u8 num_other_acl;
+        u8 num_bdr;
+};
+
+void ath_mci_flush_profile(struct ath_mci_profile *mci);
+void ath_mci_process_profile(struct ath_softc *sc,
+                             struct ath_mci_profile_info *info);
+void ath_mci_process_status(struct ath_softc *sc,
+                            struct ath_mci_profile_status *status);
+#endif
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 03b0a651a591..55d077e7135d 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -601,6 +601,7 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
         struct sk_buff *skb;
         struct ieee80211_tx_info *tx_info;
         struct ieee80211_tx_rate *rates;
+        struct ath_mci_profile *mci = &sc->btcoex.mci;
         u32 max_4ms_framelen, frmlen;
         u16 aggr_limit, legacy = 0;
         int i;
@@ -645,7 +646,9 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
         if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy)
                 return 0;
 
-        if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
+        if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
+                aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
+        else if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
                 aggr_limit = min((max_4ms_framelen * 3) / 8,
                                  (u32)ATH_AMPDU_LIMIT_MAX);
         else