Decrease avalon frequency in auto mode if we are unable to maintain the temperature in the optimal range.

driver-avalon.c

@@ -885,7 +885,11 @@ static void *avalon_send_tasks(void *userdata)
 
 		if (opt_avalon_auto && info->auto_queued >= AVALON_AUTO_CYCLE) {
 			mutex_lock(&info->lock);
-			if (info->auto_nonces >= (AVALON_AUTO_CYCLE * 19 / 20) &&
+			if (!info->optimal) {
+				applog(LOG_WARNING, "AVA%i: Above optimal temperature, throttling",
+				       avalon->device_id);
+				avalon_dec_freq(info);
+			} else if (info->auto_nonces >= (AVALON_AUTO_CYCLE * 19 / 20) &&
 				   info->auto_nonces <= (AVALON_AUTO_CYCLE * 21 / 20)) {
 					int total = info->auto_nonces + info->auto_hw;
 
@@ -1083,6 +1087,10 @@ static inline void adjust_fan(struct avalon_info *info)
 			temp_drop(info, temp_new);
 	}
 	info->temp_old = temp_new;
+	if (info->temp_old <= opt_avalon_temp)
+		info->optimal = true;
+	else
+		info->optimal = false;
 }
 
 static void avalon_update_temps(struct cgpu_info *avalon, struct avalon_info *info,

driver-avalon.h

@@ -134,6 +134,7 @@ struct avalon_info {
 	bool idle;
 	bool reset;
 	bool overheat;
+	bool optimal;
 };
 
 #define AVALON_WRITE_SIZE (sizeof(struct avalon_task))