Commit b88fc8b8cefe02f0ad3e18ede56b266a5ce8339b
2014-02-03T21:18:22
Add hfa fanspeed control to try and maintain a target temperature.
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diff --git a/driver-hashfast.c b/driver-hashfast.c
index 52099d8..ff8db27 100644
--- a/driver-hashfast.c
+++ b/driver-hashfast.c
@@ -971,16 +971,22 @@ out:
}
static void hfa_set_fanspeed(struct cgpu_info *hashfast, struct hashfast_info *info,
- int fanspeed)
+ int fandiff)
{
const uint8_t opcode = HF_USB_CMD(OP_FAN);
uint8_t packet[256];
struct hf_header *p = (struct hf_header *)packet;
const int tx_length = sizeof(struct hf_header);
uint16_t hdata;
-
- info->fanspeed = fanspeed;
- hdata = fanspeed * 255 / 100; // Fanspeed is in percent, hdata 0-255
+ int fandata;
+
+ info->fanspeed += fandiff;
+ if (info->fanspeed > opt_hfa_fan_max)
+ info->fanspeed = opt_hfa_fan_max;
+ else if (info->fanspeed < opt_hfa_fan_min)
+ info->fanspeed = opt_hfa_fan_min;
+ fandata = info->fanspeed * 255 / 100; // Fanspeed is in percent, hdata 0-255
+ hdata = fandata; // Use an int first to avoid overflowing uint16_t
p->preamble = HF_PREAMBLE;
p->operation_code = hfa_cmds[opcode].cmd;
p->chip_address = 0xff;
@@ -1029,11 +1035,54 @@ static void hfa_decrease_clock(struct cgpu_info *hashfast, struct hashfast_info
static void hfa_temp_clock(struct cgpu_info *hashfast, struct hashfast_info *info)
{
time_t now_t = time(NULL);
- int i;
+ bool throttled = false;
+ int temp_change, i;
if (!opt_hfa_target)
return;
+ /* First find out if any dies are throttled before trying to optimise
+ * fanspeed */
+ for (i = 0; i < info->asic_count ; i++) {
+ struct hf_die_data *hdd = &info->die_data[i];
+
+ if (hdd->hash_clock < info->hash_clock_rate) {
+ throttled = true;
+ break;
+ }
+ }
+
+ /* Find the direction of temperature change since we last checked */
+ temp_change = info->max_temp - info->last_max_temp;
+ info->last_max_temp = info->max_temp;
+
+ /* Adjust fanspeeds first if possible before die speeds, increasing
+ * speed quickly and lowering speed slowly */
+ if (info->max_temp > opt_hfa_target ||
+ (throttled && info->max_temp >= opt_hfa_target - HFA_TEMP_HYSTERESIS)) {
+ /* We should be trying to decrease temperature, if it's not on
+ * its way down. */
+ if (temp_change >= 0 && info->fanspeed < opt_hfa_fan_max)
+ hfa_set_fanspeed(hashfast, info, 5);
+ } else if (info->max_temp >= opt_hfa_target - HFA_TEMP_HYSTERESIS) {
+ /* In optimal range, try and maintain the same temp */
+ if (temp_change > 0) {
+ /* Temp rising, tweak fanspeed up */
+ if (info->fanspeed < opt_hfa_fan_max)
+ hfa_set_fanspeed(hashfast, info, 1);
+ } else if (temp_change < 0) {
+ /* Temp falling, tweak fanspeed down */
+ if (info->fanspeed > opt_hfa_fan_min)
+ hfa_set_fanspeed(hashfast, info, -1);
+ }
+ } else {
+ /* Below optimal range, try and increase temp */
+ if (temp_change <= 0 && !throttled) {
+ if (info->fanspeed > opt_hfa_fan_min)
+ hfa_set_fanspeed(hashfast, info, -1);
+ }
+ }
+
/* Do no restarts at all if there has been one less than 15 seconds
* ago */
if (now_t - info->last_restart < 15)