drm/amd/powerplay: Reload and initialize the smc firmware on powerplay resume.

Reviewed-by: Alex Deucher <alexander.deucher@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

@@ -203,13 +203,29 @@ static int pp_resume(void *handle)
 	struct pp_instance *pp_handle;
 	struct pp_eventmgr *eventmgr;
 	struct pem_event_data event_data = { {0} };
+	struct pp_smumgr *smumgr;
+	int ret;
 
 	if (handle == NULL)
 		return -EINVAL;
 
 	pp_handle = (struct pp_instance *)handle;
+	smumgr = pp_handle->smu_mgr;
+
+	if (smumgr == NULL || smumgr->smumgr_funcs == NULL ||
+		smumgr->smumgr_funcs->start_smu == NULL)
+		return -EINVAL;
+
+	ret = smumgr->smumgr_funcs->start_smu(smumgr);
+	if (ret) {
+		printk(KERN_ERR "[ powerplay ] smc start failed\n");
+		smumgr->smumgr_funcs->smu_fini(smumgr);
+		return ret;
+	}
+
 	eventmgr = pp_handle->eventmgr;
 	pem_handle_event(eventmgr, AMD_PP_EVENT_RESUME, &event_data);
+
 	return 0;
 }
 
@@ -624,6 +640,7 @@ int amd_powerplay_display_configuration_change(void *handle, const void *input)
 	hwmgr = ((struct pp_instance *)handle)->hwmgr;
 
 	phm_store_dal_configuration_data(hwmgr, display_config);
+
 	return 0;
 }