Set ECP (scaler/overlay clock) divider. The limits were taken from the
XFree86 ati driver.
Signed-off-by: NVille Syrjälä <syrjala@sci.fi>
Signed-off-by: NAntonino Daplas <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>