drm/aspeed: Allow higher screen resolutions to be set
Most AST2500 hardware uses the 40MHz pixel clock option for the
GFX block, yielding a maximum resolution of 800x600@60Hz.
However, the GFX block is normally used to display relatively
slowly changing information, and the increased resolution
obtained at 30Hz may be useful for some applications.
The utility of 30Hz refresh rate with standard VGA / CRT
applications is relatively low, but 30Hz refresh over DVO
with modern flat panels should be workable. Relax the
maximum resolution limits accordingly for DVO outputs.
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
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