[Bug 91791] [SKL-U] System hang when plug in a VGA monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91791

--- Comment #27 from Gary Wang <gary.c.wang at intel.com> ---
Hi Jim,

It seems to be necessary adding DDI PLL mapping in  intel_mst_pre_enable_dp
method (please refer
http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_dp_mst.c#L188). 
But it still got failed after I wrote DPLL_CTRL2 with corresponding port for
it, and need to check it in related spec further, upset.

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