[Bug 89661] [ivb] Unable to configure 3rd pipe (e.g. LVDS + DP + DP)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89661

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
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             Status|ASSIGNED                    |NEEDINFO

--- Comment #26 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #25)
> The problem is that we may end up using 1.62 link rate for one DP port, and
> 2.7 for the other DP port, leaving no free DPLLs for the non-DP port.
> 
> Fixing this requires that we'd consider the failure to find a DPLL as a
> reason to retry in the bw_constrained mode (or some similar mode) and made
> the DP link rate selection try to pick a common rate for all ports.

I was a bit bored the other day and decided to see if I could hack this thing
up. Didn't turn out to be too painful. I've not really tested it myself since I
don't have an IVB with two DP ports. But at least it didn't seem to explode too
badly when I tried it with a machine that has one DP port.

git://github.com/vsyrjala/linux.git ivb_bifurcation_atomic_9

I'd be interested to know if it actually works.

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