drm/amdgpu: enable mmhub pg on raven

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

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -625,7 +625,8 @@ static int soc15_common_early_init(void *handle)
 			AMD_CG_SUPPORT_MC_LS |
 			AMD_CG_SUPPORT_SDMA_MGCG |
 			AMD_CG_SUPPORT_SDMA_LS;
-		adev->pg_flags = AMD_PG_SUPPORT_SDMA;
+		adev->pg_flags = AMD_PG_SUPPORT_SDMA |
+				 AMD_PG_SUPPORT_MMHUB;
 		adev->external_rev_id = 0x1;
 		break;
 	default: