[Bug 101917] New: [IGT][SKL] Failed DP link training attempt on resume with disconnected connector when testing with Chamelium

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101917

            Bug ID: 101917
           Summary: [IGT][SKL] Failed DP link training attempt on resume
                    with disconnected connector when testing with
                    Chamelium
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paul.kocialkowski at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 132955
  --> https://bugs.freedesktop.org/attachment.cgi?id=132955&action=edit
dmesg from 20170721 drm-tip

i915 attempts to perform DP link training on resume with a connector that was
reported as disconnected before suspend, which fails with:
[CONNECTOR:55:DP-1] Link Training failed at link rate = 162000, lane count = 4

This occurs when running the hdmi-edid-change-during-suspend IGT test with a
Chamelium connected to both the HDMI and DP port of the DUT. The chamelium test
will unplug all connectors (through their HPD line), including the concerned DP
connector (DP-1). It will then connect the HDMI connector for the test, and
suspend. The DP connector remains in a disconnected state, despite being
physically attached. i915 then attempts to perform the link training on the DP
connector.

If the DP connector is physically disconnected from the start, i915 does not
attempt to perform link training for it.

Information about the setup:
* Kernel: drm-tip 2a4f73050a961e1a176d35561e39386da9ea9c67
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K

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