Comment # 7 on bug 77673 from Jaime Velasco Juan

(In reply to comment #6)
> Please try the attached patch.
> 
> We now always use the fixed reference divider if both RADEON_PLL_USE_REF_DIV
> and RADEON_PLL_USE_FRAC_FB_DIV are set.
> 
> If only RADEON_PLL_USE_REF_DIV is set then we only use the fixed value as
> minimum limit.

The path fixes the issue. Thanks!