ath9k: adjust WLAN and BT concurrent transmission

The simulataneous transmission of both WLAN and BT might cause
increase in power levels. To avoid regulatory violation, WLAN tx
power will be adjusted according to BT power index based on avaliability
of BT scheduling messages. WLAN tx power reduction might affect its
performance. So WLAN tx power is only be lowered when the signal strength
is good enough. Otherwise concurrent tx will be disabled and WLAN uses
it default power levels. Also concurrent tx is disabled whenever WLAN is
moving to off-channel which might be used by BT.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
index b37c8af6e02c..19dbac42f3d9 100644
--- a/drivers/net/wireless/ath/ath9k/mci.c
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -710,3 +710,62 @@ send_wlan_chan:
 	ar9003_mci_send_wlan_channels(ah);
 	ar9003_mci_state(ah, MCI_STATE_SEND_VERSION_QUERY);
 }
+
+void ath9k_mci_set_txpower(struct ath_softc *sc, bool setchannel,
+			   bool concur_tx)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath9k_hw_mci *mci_hw = &sc->sc_ah->btcoex_hw.mci;
+	bool old_concur_tx = mci_hw->concur_tx;
+
+	if (!(mci_hw->config & ATH_MCI_CONFIG_CONCUR_TX)) {
+		mci_hw->concur_tx = false;
+		return;
+	}
+
+	if (!IS_CHAN_2GHZ(ah->curchan))
+		return;
+
+	if (setchannel) {
+		struct ath9k_hw_cal_data *caldata = &sc->caldata;
+		if ((caldata->chanmode == CHANNEL_G_HT40PLUS) &&
+		    (ah->curchan->channel > caldata->channel) &&
+		    (ah->curchan->channel <= caldata->channel + 20))
+			return;
+		if ((caldata->chanmode == CHANNEL_G_HT40MINUS) &&
+		    (ah->curchan->channel < caldata->channel) &&
+		    (ah->curchan->channel >= caldata->channel - 20))
+			return;
+		mci_hw->concur_tx = false;
+	} else
+		mci_hw->concur_tx = concur_tx;
+
+	if (old_concur_tx != mci_hw->concur_tx)
+		ath9k_hw_set_txpowerlimit(ah, sc->config.txpowlimit, false);
+}
+
+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;
+
+	if (!(mci_hw->config & ATH_MCI_CONFIG_CONCUR_TX))
+		return;
+
+	if (ah->stats.avgbrssi >= 40) {
+		if (btcoex->rssi_count < 0)
+			btcoex->rssi_count = 0;
+		if (++btcoex->rssi_count >= ATH_MCI_CONCUR_TX_SWITCH) {
+			btcoex->rssi_count = 0;
+			ath9k_mci_set_txpower(sc, false, true);
+		}
+	} else {
+		if (btcoex->rssi_count > 0)
+			btcoex->rssi_count = 0;
+		if (--btcoex->rssi_count <= -ATH_MCI_CONCUR_TX_SWITCH) {
+			btcoex->rssi_count = 0;
+			ath9k_mci_set_txpower(sc, false, false);
+		}
+	}
+}