drm/radeon: validate PPLL in crtc fixup

This allows us to bail if we can't support the requested
setup from a PPLL perspective.  Prevents broken setups
from being attempted.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2012-09-14 12:30:51 -04:00
commit c0fd0834aa