[Bug 98374] async fbdev initial config leads to DP link train before first modeset: WARN_ON_ONCE(!intel_dp->lane_count)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
It's not just async fbdev. It's just complete garbage in

commit 7d23e3c37bb3fc6952dc84007ee60cb533fd2d5c
Author: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
Date:   Wed Mar 30 18:05:23 2016 +0530

    drm/i915: Cleaning up intel_dp_hpd_pulse

    Current DP detection has DPCD operations split across
    intel_dp_hpd_pulse and intel_dp_detect which contains
    duplicates as well. Also intel_dp_detect is called
    during modes enumeration as well which will result
    in multiple dpcd operations. So this patch tries
    to solve both these by bringing all DPCD operations
    in one single function and make intel_dp_detect
    use existing values instead of repeating same steps.

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