drm/amdgpu: Add DPM function for XGMI link power down control

Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NJohn Clements <john.clements@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -1188,3 +1188,13 @@ int amdgpu_dpm_set_df_cstate(struct amdgpu_device *adev,
 
 	return ret;
 }
+
+int amdgpu_dpm_allow_xgmi_power_down(struct amdgpu_device *adev, bool en)
+{
+	struct smu_context *smu = &adev->smu;
+
+	if (is_support_sw_smu(adev))
+		return smu_allow_xgmi_power_down(smu, en);
+
+	return 0;
+}
\ No newline at end of file

drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h

@@ -538,4 +538,6 @@ int amdgpu_dpm_baco_enter(struct amdgpu_device *adev);
 int amdgpu_dpm_set_df_cstate(struct amdgpu_device *adev,
 			     uint32_t cstate);
 
+int amdgpu_dpm_allow_xgmi_power_down(struct amdgpu_device *adev, bool en);
+
 #endif