[Bug 98374] lane count error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98374

--- Comment #3 from Jani Nikula <jani.nikula at intel.com> ---
Async fbdev initial config calls back to intel_dp_detect before we've done the
first proper modeset and set the lane_count.

There are a couple of commits that are the *messenger* here that this will
bisect to, but must not be reverted:

commit d4cb3fd9b548b8bfe2a712ec920b9ebabd3547ab
Author: Matthew Auld <matthew.auld at intel.com>
Date:   Wed Oct 19 22:29:53 2016 +0100

    drm/i915/dp: add lane_count check in intel_dp_check_link_status

and related

commit dd788090822300a66ff469ae9e50f6d28d124eb8
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Thu Jul 28 17:55:04 2016 +0300

    drm/i915: Warn about aux msg buffer vs. size mismatch

Apparently there was a commit to mitigate related problems in

commit d626f34573551479f62b09d4df09efc4af88136d
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Jun 21 09:16:53 2016 +0100

    drm/i915/fbdev: Perform async fbdev initialisation much later

Possibly the problem wasn't introduced not so much by async fbdev but rather
changes in intel_dp_detect.

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