drm/amdgpu: refine the logic in amdgpu_need_post()
We check the mem config register to make sure it's been programmed by the vbios to determine if we need to post so we check for a non-0 value. However, when the asic comes out of reset, we may see all ones here, so check for that too. Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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