ath9k_htc: Add support for handling TX power configuration

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1411,6 +1411,7 @@ static int ath9k_htc_config(struct ieee80211_hw *hw, u32 changed)
 		}
 
 	}
+
 	if (changed & IEEE80211_CONF_CHANGE_PS) {
 		if (conf->flags & IEEE80211_CONF_PS) {
 			ath9k_htc_setpower(priv, ATH9K_PM_NETWORK_SLEEP);
@@ -1422,6 +1423,11 @@ static int ath9k_htc_config(struct ieee80211_hw *hw, u32 changed)
 		}
 	}
 
+	if (changed & IEEE80211_CONF_CHANGE_POWER) {
+		priv->txpowlimit = 2 * conf->power_level;
+		ath_update_txpow(priv);
+	}
+
 	if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
 		if (conf->flags & IEEE80211_CONF_MONITOR) {
 			if (ath9k_htc_add_monitor_interface(priv))