drm/amd/powerplay: commit get_performance_level API as DAL needed

This can suppress the error reported on driver loading. Also these
are empty APIs as Vega12/Vega20 has no performance levels.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega12_hwmgr.c

@@ -2356,6 +2356,13 @@ static int vega12_gfx_off_control(struct pp_hwmgr *hwmgr, bool enable)
 		return vega12_disable_gfx_off(hwmgr);
 }
 
+static int vega12_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw_power_state *state,
+				PHM_PerformanceLevelDesignation designation, uint32_t index,
+				PHM_PerformanceLevel *level)
+{
+	return 0;
+}
+
 static const struct pp_hwmgr_func vega12_hwmgr_funcs = {
 	.backend_init = vega12_hwmgr_backend_init,
 	.backend_fini = vega12_hwmgr_backend_fini,
@@ -2406,6 +2413,7 @@ static const struct pp_hwmgr_func vega12_hwmgr_funcs = {
 	.register_irq_handlers = smu9_register_irq_handlers,
 	.start_thermal_controller = vega12_start_thermal_controller,
 	.powergate_gfx = vega12_gfx_off_control,
+	.get_performance_level = vega12_get_performance_level,
 };
 
 int vega12_hwmgr_init(struct pp_hwmgr *hwmgr)

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c

@@ -2041,6 +2041,13 @@ int vega20_display_clock_voltage_request(struct pp_hwmgr *hwmgr,
 	return result;
 }
 
+static int vega20_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw_power_state *state,
+				PHM_PerformanceLevelDesignation designation, uint32_t index,
+				PHM_PerformanceLevel *level)
+{
+	return 0;
+}
+
 static int vega20_notify_smc_display_config_after_ps_adjustment(
 		struct pp_hwmgr *hwmgr)
 {
@@ -3487,6 +3494,8 @@ static const struct pp_hwmgr_func vega20_hwmgr_funcs = {
 		vega20_set_watermarks_for_clocks_ranges,
 	.display_clock_voltage_request =
 		vega20_display_clock_voltage_request,
+	.get_performance_level =
+		vega20_get_performance_level,
 	/* UMD pstate, profile related */
 	.force_dpm_level =
 		vega20_dpm_force_dpm_level,