drm/amd/pp: Implement AMDGPU_PP_SENSOR_MIN/MAX_FAN_RPM

so user can query the RPM range
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -813,6 +813,12 @@ static int pp_dpm_read_sensor(void *handle, int idx,
 	case AMDGPU_PP_SENSOR_STABLE_PSTATE_MCLK:
 		*((uint32_t *)value) = hwmgr->pstate_mclk;
 		return 0;
+	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
+		*((uint32_t *)value) = hwmgr->thermal_controller.fanInfo.ulMinRPM;
+		return 0;
+	case AMDGPU_PP_SENSOR_MAX_FAN_RPM:
+		*((uint32_t *)value) = hwmgr->thermal_controller.fanInfo.ulMaxRPM;
+		return 0;
 	default:
 		mutex_lock(&hwmgr->smu_lock);
 		ret = hwmgr->hwmgr_func->read_sensor(hwmgr, idx, value, size);

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_processpptables.c

@@ -834,6 +834,8 @@ static int init_powerplay_table_information(
 
 	hwmgr->thermal_controller.ucType = powerplay_table->ucThermalControllerType;
 	pptable_information->uc_thermal_controller_type = powerplay_table->ucThermalControllerType;
+	hwmgr->thermal_controller.fanInfo.ulMinRPM = 0;
+	hwmgr->thermal_controller.fanInfo.ulMaxRPM = powerplay_table->smcPPTable.FanMaximumRpm;
 
 	set_hw_cap(hwmgr,
 		ATOM_VEGA20_PP_THERMALCONTROLLER_NONE != hwmgr->thermal_controller.ucType,