[Bug 91876] New: [SKL EDP] DP Aux A is not working without first disabling DC6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91876

            Bug ID: 91876
           Summary: [SKL EDP] DP Aux A is not working without first
                    disabling DC6
           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: patrik.r.jakobsson at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118078
  --> https://bugs.freedesktop.org/attachment.cgi?id=118078&action=edit
dmesg

DP Aux A is not working without first disabling DC6. Not really a regression
but since commit a7f749f9c7e8222405740f6081bd183137d1d6f2 the DMC is working
and we can enter DC states which made this bug visible. The result is that
modesetting takes a few seconds but still succeeds.

We get a few of these:
[drm:intel_dp_aux_ch [i915]] *ERROR* dp aux hw did not signal timeout (has irq:
1)!

Before finally giving up with:
[drm:intel_dp_aux_ch [i915]] *ERROR* dp_aux_ch not done status 0xad40001f

I'm currently writing code to allow for power domain get/put to disable/enable
dc states for platform restrictions.

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