drm/amdgpu: add mmhub powergating set by smu

PSP will disable legacy mmhub PG setting that is programming
registers, and drive will use SMC message to
set it up.

Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -471,6 +471,9 @@ void mmhub_v1_0_update_power_gating(struct amdgpu_device *adev,
 						RENG_EXECUTE_ON_REG_UPDATE, 1);
 		WREG32_SOC15(MMHUB, 0, mmPCTL1_RENG_EXECUTE, pctl1_reng_execute);
 
+		if (adev->powerplay.pp_funcs->set_mmhub_powergating_by_smu)
+			amdgpu_dpm_set_mmhub_powergating_by_smu(adev);
+
 	} else {
 		pctl0_reng_execute = REG_SET_FIELD(pctl0_reng_execute,
 						PCTL0_RENG_EXECUTE,