[Bug 84265] [BSW Bisected]System fails to find eDP monitor.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84265

--- Comment #11 from wendy.wang at intel.com ---
(In reply to Ville Syrjala from comment #10)
> Created attachment 107624 [details] [review]
> [PATCH] drm/i915: Don't trust the DP_DETECT bit for eDP ports on CHV
> 
> Ok, so it seems the DDC pins are muxed in such a way on these boards that
> there's no DDC pins for port C, and thus no strap for the port detect.
> 
> I have no idea how it manages to work for some people (including me), but
> maybe the straps are sampled before the pin muxing is changed or something.
> Although even that is a very weak theory since the default muxing seems to
> be such that
> there's no DDC for port C. So I can't actually explain how the detect bit
> ends up as 1 on my machine.
> 
> Anyway this patch will check the VBT to see if there should be an eDP port
> there even if the strap said otherwise. We anyway rely on the VBT to tell DP
> and eDP apart so this doesn't actually increase our dependence on the VBT.

This patch can fix the edp not light problem with R10 rework on BSW. Pls help
upstream the patch, thanks.

Detail configuration:
BSW RVP FAB2 with R9,R10,R11 rework
B1 CPU silicon
KSC is 1.02
BIOS: V36
RAM: 2x 2GB
OS: Ubuntu 14.04 x64

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