ath9k: stomp audio profiles on weak signal strength

On lower WLAN signal strength, WLAN downlink traffic might suffer
from retransmissions. At the mean time, playing SCO/A2DP profiles
is affecting WLAN stability. In such scenario, by stomping SCO/A2DP
BT traffic completely for a BTCOEX period, gives WLAN traffic an
oppertunity to recover PHY rate. It also improves WLAN stability at
lower RSSI without sacificing BT traffic.

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/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 9a93d2b..04fa5f3 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -488,6 +488,7 @@ struct ath_btcoex {
        int rssi_count;
        struct ath_gen_timer *no_stomp_timer; /* Timer for no BT stomping */
        struct ath_mci_profile mci;
+       u8 stomp_audio;
 };
 
 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT

diff --git a/drivers/net/wireless/ath/ath9k/btcoex.c b/drivers/net/wireless/ath/ath9k/btcoex.c
index c90e9bc..9963b0b 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/btcoex.c
+++ b/drivers/net/wireless/ath/ath9k/btcoex.c
@@ -49,6 +49,7 @@ static const u32 mci_wlan_weights[ATH_BTCOEX_STOMP_MAX]
        { 0x01017d01, 0x3b3b3b01, 0x3b3b3b01, 0x3b3b3b3b }, /* STOMP_LOW */
        { 0x01017d01, 0x01010101, 0x01010101, 0x01010101 }, /* STOMP_NONE */
        { 0x01017d01, 0x013b0101, 0x3b3b0101, 0x3b3b013b }, /* STOMP_LOW_FTP */
+       { 0xffffff01, 0xffffffff, 0xffffff01, 0xffffffff }, /* STOMP_AUDIO */
 };
 
 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 2f84ab2..6de26ea 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/btcoex.h
+++ b/drivers/net/wireless/ath/ath9k/btcoex.h
@@ -50,6 +50,7 @@ enum ath_stomp_type {
        ATH_BTCOEX_STOMP_LOW,
        ATH_BTCOEX_STOMP_NONE,
        ATH_BTCOEX_STOMP_LOW_FTP,
+       ATH_BTCOEX_STOMP_AUDIO,
        ATH_BTCOEX_STOMP_MAX
 };
 

diff --git a/drivers/net/wireless/ath/ath9k/gpio.c b/drivers/net/wireless/ath/ath9k/gpio.c
index 4236df8..7b39cc1 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/gpio.c
+++ b/drivers/net/wireless/ath/ath9k/gpio.c
@@ -247,6 +247,9 @@ static void ath_btcoex_period_timer(unsigned long data)
                        stomp_type = ATH_BTCOEX_STOMP_ALL;
                        timer_period = btcoex->btscan_no_stomp;
                }
+       } else if (btcoex->stomp_audio >= 5) {
+               stomp_type = ATH_BTCOEX_STOMP_AUDIO;
+               btcoex->stomp_audio = 0;
        }
 
        ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
@@ -295,7 +298,7 @@ static void ath_btcoex_no_stomp_timer(void *arg)
            (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI) &&
             test_bit(BT_OP_SCAN, &btcoex->op_flags)))
                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
-        else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
+       else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
                ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 
        ath9k_hw_btcoex_enable(ah);

diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index ece192d..706378e 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/mci.c
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -729,12 +729,30 @@ void ath9k_mci_set_txpower(struct ath_softc *sc, bool setchannel,
                ath9k_hw_set_txpowerlimit(ah, sc->config.txpowlimit, false);
 }
 
+static void ath9k_mci_stomp_audio(struct ath_softc *sc)
+{
+       struct ath_hw *ah = sc->sc_ah;
+       struct ath_btcoex *btcoex = &sc->btcoex;
+       struct ath_mci_profile *mci = &btcoex->mci;
+
+       if (!mci->num_sco && !mci->num_a2dp)
+               return;
+
+       if (ah->stats.avgbrssi > 25) {
+               btcoex->stomp_audio = 0;
+               return;
+       }
+
+       btcoex->stomp_audio++;
+}
 void ath9k_mci_update_rssi(struct ath_softc *sc)
 {
        struct ath_hw *ah = sc->sc_ah;
        struct ath_btcoex *btcoex = &sc->btcoex;
        struct ath9k_hw_mci *mci_hw = &sc->sc_ah->btcoex_hw.mci;
 
+       ath9k_mci_stomp_audio(sc);
+
        if (!(mci_hw->config & ATH_MCI_CONFIG_CONCUR_TX))
                return;