[Bug 172421] radeon: allow to set the TMDS frequency by a special kernel parameter

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=172421

--- Comment #15 from Roland Scheidegger <rscheidegger at gmx.ch> ---
(In reply to Christian König from comment #14)
> (In reply to Roland Scheidegger from comment #13)
> > Personally I've always thought the risk of damaging hardware with any kind
> > of overclocking is just about exactly zero as long as you don't increase
> > voltage levels
> 
> Unfortunately this is exactly what happens here. The clock is generated by a
> voltage controlled oscillator and for the desired resolution you need to
> over clock it by about 30-40%.
> 
> That in turn means you raise the voltage way over the nominal limit.

Oh interesting - didn't know voltage was directly tied to clock frequency here.
Makes sense then to not allow it (at least if that circuitry isn't shared with
DP, as the DP link runs at much higher clock (540Mhz actually), but I suppose
it's really different there).

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