[Bug 86237] [SGB bisected]DP can't light up after rotation and unplug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86237

Li Xu <li.l.xu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
            Summary|[SGB]DP can't light up      |[SGB bisected]DP can't
                   |after rotation and unplug   |light up after rotation and
                   |                            |unplug

--- Comment #1 from Li Xu <li.l.xu at intel.com> ---
bisect result:
first bad commit:
commit 0e32b39ceed665bfa4a77a4bc307b6652b991632
Author: Dave Airlie <airlied at redhat.com>
Date:   Fri May 2 14:02:48 2014 +1000

    drm/i915: add DP 1.2 MST support (v0.7)

    This adds DP 1.2 MST support on Haswell systems.

    Notes:
    a) this reworks irq handling for DP MST ports, so that we can
    avoid the mode config locking in the current hpd handlers, as
    we need to process up/down msgs at a better time.

    Changes since v0.1:
    use PORT_PCH_HOTPLUG to detect short vs long pulses
    add a workqueue to deal with digital events as they can get blocked on the
    main workqueue beyong mode_config mutex
    fix a bunch of modeset checker warnings
    acks irqs in the driver
    cleanup the MST encoders

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