drm/radeon: allow MIP_ADDRESS=0 for MSAA textures on Evergreen
MIP_ADDRESS should point to the resolved FMASK for an MSAA texture.
Setting MIP_ADDRESS to 0 means the FMASK pointer is invalid (the GPU
won't read the memory then).
The userspace has to set MIP_ADDRESS to 0 and *not* emit any relocation
for it.
Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
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