[Intel-gfx] [PATCH 02/10] drm/i915: fix FDI lane calculation

[Damien Lespiau]

> -                * Account for spread spectrum to avoid
> -                * oversubscribing the link. Max center spread
> -                * is 2.5%; use 5% for safety's sake.
> +                * The spec says:
> +                * Number of lanes >= INT(dot clock * bytes per pixel / ls_clk)

Right, so the real question is: "Is that ok to not get the spread rate
(maximum of how much we derive from the requested frequency) into
account?"

I believe it is, on average the frequency is what we set-up. Maybe
Adam can shed more light on why he thought it was necessary?

As a side note, the spec does not mention that at all.

-- 
Damien