drm/amd/powerplay: add fan rpm limit interface for hwmon

Add fan1_min and fan2_max function for hwmon.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -1092,6 +1092,8 @@ static int smu_v11_0_read_sensor(struct smu_context *smu,
 				 enum amd_pp_sensors sensor,
 				 void *data, uint32_t *size)
 {
+	struct smu_table_context *table_context = &smu->smu_table;
+	PPTable_t *pptable = table_context->driver_pptable;
 	int ret = 0;
 	switch (sensor) {
 	case AMDGPU_PP_SENSOR_GPU_LOAD:
@@ -1127,6 +1129,14 @@ static int smu_v11_0_read_sensor(struct smu_context *smu,
 		*(uint32_t *)data = smu_feature_is_enabled(smu, FEATURE_DPM_VCE_BIT) ? 1 : 0;
 		*size = 4;
 		break;
+	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
+		*(uint32_t *)data = 0;
+		*size = 4;
+		break;
+	case AMDGPU_PP_SENSOR_MAX_FAN_RPM:
+		*(uint32_t *)data = pptable->FanMaximumRpm;
+		*size = 4;
+		break;
 	default:
 		ret = smu_common_read_sensor(smu, sensor, data, size);
 		break;