fix radeon and amdgpu for addressing limited root ports

Christoph Hellwig hch at
Thu Aug 15 07:26:59 UTC 2019

Hi AMD graphics maintainers,

this series fixes a problem in the radeon driver for systems where the
PCIe root port only supports limited (32-bit) addressing as reported
by Atish.  I then also fixed the same issue in amdgpu as the code was
copy and pasted there, and cleaned up the dma mask setting while
touching that area.

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