From ce214e127088cef6882a7d047c80363598773d33 Mon Sep 17 00:00:00 2001
From: Con Kolivas <kernel@kolivas.org>
Date: Mon, 1 Jul 2013 15:10:56 +1000
Subject: [PATCH] Decrease avalon frequency in auto mode if we are unable to
 maintain the temperature in the optimal range.

---
 driver-avalon.c | 26 +++++++++++++++++---------
 driver-avalon.h |  1 +
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/driver-avalon.c b/driver-avalon.c
index c3b3aa7a..eee6d3a3 100644
--- a/driver-avalon.c
+++ b/driver-avalon.c
@@ -885,15 +885,19 @@ 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) &&
-			    info->auto_nonces <= (AVALON_AUTO_CYCLE * 21 / 20)) {
-				int total = info->auto_nonces + info->auto_hw;
-
-				/* Try to keep hw errors ~1% */
-				if (info->auto_hw * 200 < total)
-					avalon_inc_freq(info);
-				else if (info->auto_hw * 100 > total)
-					avalon_dec_freq(info);
+			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;
+
+					/* Try to keep hw errors ~1% */
+					if (info->auto_hw * 200 < total)
+						avalon_inc_freq(info);
+					else if (info->auto_hw * 100 > total)
+						avalon_dec_freq(info);
 			}
 			avalon_reset_auto(info);
 			mutex_unlock(&info->lock);
@@ -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,
diff --git a/driver-avalon.h b/driver-avalon.h
index 9454f246..4ab16d93 100644
--- a/driver-avalon.h
+++ b/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))