drm/radeon: fix for memory training on bonaire 0x6649

Workaround for memory link training on certain variants
of 0x6649.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2014-11-07 12:00:25 -05:00
commit 9feb3dda5c