[Bug 71701] Regression, i915 DisplayPort link training via DP-to-VGA dongle, blank screen

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71701

--- Comment #30 from Kris Karas <bugs-a13 at moonlit-rail.com> ---
Created attachment 139681
  --> https://bugzilla.kernel.org/attachment.cgi?id=139681&action=edit
Updated patch against 3.15.x

Although mainline 3.15 has a good bit of rework in the drm/i915 area, it still
suffers from the regressed logic introduced in 3.13.6 - a loop that times out
prior to completion of link training, evidently due to delays introduced by a
DP=>VGA dongle.

This patch merely adds a more sensible timeout value of roughly 100
milliseconds to the loop, longer than the 2,800 microseconds introduced in
3.13.6, and shorter than the infinite timeout of 3.13.5.

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