diff --git a/drm/nouveau/nvkm/subdev/therm/nv40.c b/drm/nouveau/nvkm/subdev/therm/nv40.c
index 6326fdc..fed243d 100644
--- a/drm/nouveau/nvkm/subdev/therm/nv40.c
+++ b/drm/nouveau/nvkm/subdev/therm/nv40.c
@@ -76,6 +76,7 @@ nv40_temp_get(struct nvkm_therm *therm)
 	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
 	enum nv40_sensor_style style = nv40_sensor_style(therm);
 	int core_temp;
+	int slope_mul_f, slope_div_f, offset_num_f, offset_den_f;
 
 	if (style == NEW_STYLE) {
 		nvkm_wr32(device, 0x15b0, 0x80003fff);
@@ -88,13 +89,35 @@ nv40_temp_get(struct nvkm_therm *therm)
 
 	/* if the slope or the offset is unset, do no use the sensor */
 	if (!sensor->slope_div || !sensor->slope_mult ||
-	    !sensor->offset_num || !sensor->offset_den)
-	    return -ENODEV;
+	    !sensor->offset_num || !sensor->offset_den)	{
 
+	switch (therm->subdev.device->chipset) {
+	case 0x43:
+	    slope_mul_f = 792;
+	    slope_div_f = 1000;
+	    offset_num_f = 32060;
+	    offset_den_f = 1000;
+	    break;
+	case 0x44:
+	case 0x47:
+	    slope_mul_f = 700;
+	    slope_div_f = 1000;
+	    offset_num_f = 27839;
+	    offset_den_f = 1000;
+	    break;
+	default:
+	    return -ENODEV;
+	}
+	core_temp = core_temp * slope_mul_f / slope_div_f;
+	core_temp = core_temp + offset_num_f / offset_den_f;
+	core_temp = core_temp + sensor->offset_constant - 8;
+	}
+	else
+	{
 	core_temp = core_temp * sensor->slope_mult / sensor->slope_div;
 	core_temp = core_temp + sensor->offset_num / sensor->offset_den;
 	core_temp = core_temp + sensor->offset_constant - 8;
-
+	}
 	/* reserve negative temperatures for errors */
 	if (core_temp < 0)
 		core_temp = 0;