ath9k: wake up the hardware from full sleep when idle is turned off

The hardware needs a reset to recover from full sleep. Issue this reset
directly in the ath9k_config call that turns off idle, otherwise tx
remains dead until the first channel change after the idle state change
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/main.c

@@ -1548,6 +1548,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ieee80211_conf *conf = &hw->conf;
+	bool reset_channel = false;
 
 	ath9k_ps_wakeup(sc);
 	mutex_lock(&sc->mutex);
@@ -1556,6 +1557,12 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 		sc->ps_idle = !!(conf->flags & IEEE80211_CONF_IDLE);
 		if (sc->ps_idle)
 			ath_cancel_work(sc);
+		else
+			/*
+			 * The chip needs a reset to properly wake up from
+			 * full sleep
+			 */
+			reset_channel = ah->chip_fullsleep;
 	}
 
 	/*
@@ -1584,7 +1591,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 		}
 	}
 
-	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
+	if ((changed & IEEE80211_CONF_CHANGE_CHANNEL) || reset_channel) {
 		struct ieee80211_channel *curchan = hw->conf.channel;
 		int pos = curchan->hw_value;
 		int old_pos = -1;