[Bug 104918] New: [SKL] enable_psr=1 on 4.15 causes rapid hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104918

            Bug ID: 104918
           Summary: [SKL] enable_psr=1 on 4.15 causes rapid hangs
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: luto at kernel.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

With enable_psr=1 on a 4.14 Fedora kernel, I have some minor lag issues, but
everything works.  On 4.15, the system dies very quickly with PSR enabled, and
the logs say:

[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[CRTC:37:pipe A] flip_done timed out

I'll follow up if I dig out more useful info.

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