High pixel clock modes on pipe A of an 8xx chip require DOUBLE_WIDE mode. It's supposed to be modes > 180MHz or so, but the board I have requires DOUBLE_WIDE mode for clocks > 108MHz or so. The limit is related to the core clock speed of the chip, which can be found indirectly through PCI config space. None of the possible values explain why this board needs this mode for these relatively low clock rates though. Also, create tables of data for the PLL computation and use them instead of code. I think it's cleaner looking. It is also untested on 9xx. It'll work. Really. |
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