ath9k: AR9380 PAPRD changes to improve tx performance

chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c

Index: chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c
diff --git a/chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c b/chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c
index 819928575d57ea791bfd7bc158857451f02f1604..fffbd5ef7783a95864a7a5db647502bde24163a9 100644
--- a/chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c
+++ b/chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/main.c
@@ -290,6 +290,42 @@ static void ath_paprd_activate(struct ath_softc *sc)
 	ath9k_ps_restore(sc);
 }
 
+static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
+{
+	struct ieee80211_hw *hw = sc->hw;
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+	struct ath_tx_control txctl;
+	int time_left;
+
+	memset(&txctl, 0, sizeof(txctl));
+	txctl.txq = sc->tx.txq_map[WME_AC_BE];
+
+	memset(tx_info, 0, sizeof(*tx_info));
+	tx_info->band = hw->conf.channel->band;
+	tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
+	tx_info->control.rates[0].idx = 0;
+	tx_info->control.rates[0].count = 1;
+	tx_info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
+	tx_info->control.rates[1].idx = -1;
+
+	init_completion(&sc->paprd_complete);
+	sc->paprd_pending = true;
+	txctl.paprd = BIT(chain);
+	if (ath_tx_start(hw, skb, &txctl) != 0)
+		return false;
+
+	time_left = wait_for_completion_timeout(&sc->paprd_complete,
+			msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
+	sc->paprd_pending = false;
+
+	if (!time_left)
+		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CALIBRATE,
+			"Timeout waiting for paprd training on TX chain %d\n",
+			chain);
+
+	return !!time_left;
+}
+
 void ath_paprd_calibrate(struct work_struct *work)
 {
 	struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
@@ -297,28 +333,23 @@ void ath_paprd_calibrate(struct work_struct *work)
 	struct ath_hw *ah = sc->sc_ah;
 	struct ieee80211_hdr *hdr;
 	struct sk_buff *skb = NULL;
-	struct ieee80211_tx_info *tx_info;
-	int band = hw->conf.channel->band;
-	struct ieee80211_supported_band *sband = &sc->sbands[band];
-	struct ath_tx_control txctl;
 	struct ath9k_hw_cal_data *caldata = ah->caldata;
 	struct ath_common *common = ath9k_hw_common(ah);
 	int ftype;
 	int chain_ok = 0;
 	int chain;
 	int len = 1800;
-	int time_left;
-	int i;
 
 	if (!caldata)
 		return;
 
+	if (ar9003_paprd_init_table(ah) < 0)
+		return;
+
 	skb = alloc_skb(len, GFP_KERNEL);
 	if (!skb)
 		return;
 
-	tx_info = IEEE80211_SKB_CB(skb);
-
 	skb_put(skb, len);
 	memset(skb->data, 0, len);
 	hdr = (struct ieee80211_hdr *)skb->data;
@@ -329,39 +360,25 @@ void ath_paprd_calibrate(struct work_struct *work)
 	memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
 	memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);
 
-	memset(&txctl, 0, sizeof(txctl));
-	txctl.txq = sc->tx.txq_map[WME_AC_BE];
-
 	ath9k_ps_wakeup(sc);
-	ar9003_paprd_init_table(ah);
 	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
 		if (!(common->tx_chainmask & BIT(chain)))
 			continue;
 
 		chain_ok = 0;
-		memset(tx_info, 0, sizeof(*tx_info));
-		tx_info->band = band;
 
-		for (i = 0; i < 4; i++) {
-			tx_info->control.rates[i].idx = sband->n_bitrates - 1;
-			tx_info->control.rates[i].count = 6;
-		}
+		ath_print(common, ATH_DBG_CALIBRATE,
+			"Sending PAPRD frame for thermal measurement "
+			"on chain %d\n", chain);
+		if (!ath_paprd_send_frame(sc, skb, chain))
+			goto fail_paprd;
 
-		init_completion(&sc->paprd_complete);
 		ar9003_paprd_setup_gain_table(ah, chain);
-		txctl.paprd = BIT(chain);
-		if (ath_tx_start(hw, skb, &txctl) != 0)
-			break;
 
-		time_left = wait_for_completion_timeout(&sc->paprd_complete,
-				msecs_to_jiffies(ATH_PAPRD_TIMEOUT));
-		if (!time_left) {
-			ath_print(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
-				  "Timeout waiting for paprd training on "
-				  "TX chain %d\n",
-				  chain);
+		ath_print(common, ATH_DBG_CALIBRATE,
+			"Sending PAPRD training frame on chain %d\n", chain);
+		if (!ath_paprd_send_frame(sc, skb, chain))
 			goto fail_paprd;
-		}
 
 		if (!ar9003_paprd_is_done(ah))
 			break;
@@ -486,7 +503,7 @@ set_timer:
 	if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_PAPRD) && ah->caldata) {
 		if (!ah->caldata->paprd_done)
 			ieee80211_queue_work(sc->hw, &sc->paprd_work);
-		else
+		else if (!ah->paprd_table_write_done)
 			ath_paprd_activate(sc);
 	}
 }