drm/radeon: implement pcie gen2/3 support for SI
authorAlex Deucher <alexander.deucher@amd.com>
Thu, 14 Feb 2013 22:16:51 +0000 (17:16 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 27 Jun 2013 23:16:25 +0000 (19:16 -0400)
If both the motherboard and GPU support pcie gen2 or 3,
enable it.  PCIE gen2 and 3 offer more bandwidth than
pcie gen1.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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