[Bug 98141] [KBL] Can not choose correct refresh rate when using docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98141

--- Comment #4 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
intel_dp_mst_compute_config() calculates tu size as 96:
[   73.890269] [drm:intel_dump_pipe_config [i915]] dp: 1, lanes: 2, gmch_m:
12425625, gmch_n: 8388608, link_m: 1035468, link_n: 1048576, tu: 96

But when we read it out we get 32 apparently:
[   79.467108] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
dp_m_n (expected tu 96 gmch 12425625/8388608 link 1035468/1048576, or tu 0 gmch
0/0 link 0/0, found tu 32, gmch 12425625/8388608 link 1035468/1048576)

Bspec says
"Restriction : In DisplayPort MST mode the Virtual Channel payload size must
not be programmed greater than 62 (resulting payload size of 63)."

which means our computed VC payload size would seem to be invalid. Someone
should look into this.

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