[Bug 99572] New: [BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99572

            Bug ID: 99572
           Summary: [BXT DP-MST] System hang/crash when plugging in USB
                    typeC DP MST monitor
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: other
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: nathan.d.ciobanu at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 129186
  --> https://bugs.freedesktop.org/attachment.cgi?id=129186&action=edit
stack trace

Steps to reproduce:
- Connect a 4K DP MST monitor to the USB-C port on a BXT system using a USB-C
to DP dongle while the system is up
- Or boot a BXT system with a 4K DP MST monitor attached to the USB-C port
using a USB-C to DP dongle

Result:
- The system hangs or reboots immediately.


Notes:

Tentative fix:
https://lists.freedesktop.org/archives/intel-gfx/2017-January/116654.html

Adds the missing INTEL_OUTPUT_DP_MST case in bxt_get_dpll() to correctly
initialize the crtc_state and port plls when link training a DP MST monitor
on BXT/APL devices.

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