[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 #16 from Christian König <deathsimple at vodafone.de> ---
(In reply to Roland Scheidegger from comment #15)
> 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).

The voltage is only indirectly related, but yes over clocking such parts is a
rather bad idea in the long term.

DP uses a fixed frequency which is way easier to generate than the variable
HDMI/DVI/VGA clock.

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