Allow a fixed speed difference between memory and GPU clock speed that will change memory speed when GPU speed is changed in autotune mode.

adl.c

@@ -808,9 +808,11 @@ void gpu_autotune(int gpu, bool *enable)
 {
 	int temp, fanpercent, engine, newpercent, newengine;
 	bool fan_optimal = true;
+	struct cgpu_info *cgpu;
 	struct gpu_adl *ga;
 
-	ga = &gpus[gpu].adl;
+	cgpu = &gpus[gpu];
+	ga = &cgpu->adl;
 
 	lock_adl();
 	temp = __gpu_temp(ga);
@@ -880,6 +882,8 @@ void gpu_autotune(int gpu, bool *enable)
 			newengine /= 100;
 			applog(LOG_INFO, "Setting GPU %d engine clock to %d", gpu, newengine);
 			set_engineclock(gpu, newengine);
+			if (cgpu->gpu_memdiff)
+				set_memoryclock(gpu, newengine + cgpu->gpu_memdiff);
 		}
 	}
 	ga->lasttemp = temp;

main.c

@@ -1237,6 +1237,35 @@ static char *set_gpu_memclock(char *arg)
 	return NULL;
 }
 
+static char *set_gpu_memdiff(char *arg)
+{
+	int i, val = 0, device = 0;
+	char *nextptr;
+	
+	nextptr = strtok(arg, ",");
+	if (nextptr == NULL)
+		return "Invalid parameters for set gpu memdiff";
+	val = atoi(nextptr);
+	if (val < -9999 || val > 9999)
+		return "Invalid value passed to set_gpu_memdiff";
+	
+	gpus[device++].gpu_memdiff = val;
+	
+	while ((nextptr = strtok(NULL, ",")) != NULL) {
+		val = atoi(nextptr);
+		if (val < -9999 || val > 9999)
+			return "Invalid value passed to set_gpu_memdiff";
+		
+		gpus[device++].gpu_memdiff = val;
+	}
+		if (device == 1) {
+			for (i = device; i < MAX_GPUDEVICES; i++)
+				gpus[i].gpu_memdiff = gpus[0].gpu_memdiff;
+		}
+		
+			return NULL;
+}
+
 static char *set_gpu_powertune(char *arg)
 {
 	int i, val = 0, device = 0;
@@ -1525,6 +1554,9 @@ static struct opt_table opt_config_table[] = {
 	OPT_WITH_ARG("--gpu-memclock",
 		     set_gpu_memclock, NULL, NULL,
 		     "Set the GPU memory (over)clock in Mhz - one value for all or separate by commas for per card"),
+	OPT_WITH_ARG("--gpu-memdiff",
+		     set_gpu_memdiff, NULL, NULL,
+		     "Set a fixed difference in clock speed between the GPU and memory in auto-gpu mode"),
 	OPT_WITH_ARG("--gpu-powertune",
 		     set_gpu_powertune, NULL, NULL,
 		     "Set the GPU powertune percentage - one value for all or separate by commas for per card"),

miner.h

@@ -218,6 +218,7 @@ struct cgpu_info {
 	int gpu_fan;
 	int min_fan;
 	int gpu_memclock;
+	int gpu_memdiff;
 	int gpu_powertune;
 	float gpu_vddc;
 #endif