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>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index ece192d77355..706378ea3ba2 100644
--- 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;