drm/amd/powerplay: avoid unnecessary dpm level setting

No dpm level setting is needed when the request level
is actually same as current.
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -278,7 +278,8 @@ int psm_adjust_power_state_dynamic(struct pp_hwmgr *hwmgr, bool skip,
 
 	phm_notify_smc_display_config_after_ps_adjustment(hwmgr);
 
-	if (!phm_force_dpm_levels(hwmgr, hwmgr->request_dpm_level))
+	if ((hwmgr->request_dpm_level != hwmgr->dpm_level) &&
+	    !phm_force_dpm_levels(hwmgr, hwmgr->request_dpm_level))
 		hwmgr->dpm_level = hwmgr->request_dpm_level;
 
 	if (hwmgr->dpm_level != AMD_DPM_FORCED_LEVEL_MANUAL) {