drm/amd/powerplay: implement sysfs of pp_force_state for sw-smu

the SMU v11 doesn’t support pp_force_state so far, so we didn’t implement
it.
Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

@@ -429,6 +429,8 @@ static ssize_t amdgpu_set_pp_force_state(struct device *dev,
 
 	if (strlen(buf) == 1)
 		adev->pp_force_state_enabled = false;
+	else if (is_support_sw_smu(adev))
+		adev->pp_force_state_enabled = false;
 	else if (adev->powerplay.pp_funcs->dispatch_tasks &&
 			adev->powerplay.pp_funcs->get_pp_num_states) {
 		struct pp_states_info data;