drm: Loongson-3 doesn't fully support wc memory
Signed-off-by: NHuacai Chen <chenhc@lemote.com> Cc: stable@vger.kernel.org Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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