drm/radeon: improve dvi_mode_valid

Make sure we have an HDMI monitor before validating modes with
clocks >165 Mhz on single link connections.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2014-06-16 17:46:57 -04:00
commit f2263fc796