gma500_gfx: spread spectrum clocking?

George McCollister george.mccollister at gmail.com
Tue Apr 7 12:29:27 PDT 2015


Looks like these are the magic bits that need to be set:

dpll |= (7<<9) | (1<<13) | (1<<14);

Anyone happen to have proper descriptions for these bits so I could
add them to psb_intel_reg.h or thoughts on how/where an option could
be exposed to enable these?

On Mon, Apr 6, 2015 at 4:48 PM, George McCollister
<george.mccollister at gmail.com> wrote:
> emgd had an option to enable spread spectrum clocking on LVDS. The
> documentation is vague but the setting that works is:
> Option     "ALL/1/Port/4/Attr/43"    "7"
>
> Anyone have any idea how to set this with gma500_gfx or if it doesn't
> support it, how to put the hardware in this mode?
>
> Thanks,
> George McCollister


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