[Bug 89792] New: [BYT/BSW/SKL Debugfs] cat /sys/kernel/debug/dri/0/i915_sr_status showing self-refresh: disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89792

            Bug ID: 89792
           Summary: [BYT/BSW/SKL Debugfs] cat
                    /sys/kernel/debug/dri/0/i915_sr_status showing
                    self-refresh: disabled
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bin.a.xu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: No. This is the first time to do the case.
Non-working platforms: BYT/BSW/SKL 
Working platforms: BDW

==kernel==
--------------------------
-nightly: 60c5b7f582e8ced10dcd557db4ea66665e6a4dff (fails)
    drm-intel-nightly: 2015y-03m-26d-21h-48m-18s UTC integration manifest
-queued: d21bd67bbbc635424b336b7c881dbcdf6098f9f5 (fails)
    drm/i915: Don't use encoder->new_crtc in intel_lvds_compute_config()
-fixes: 5f407751b0ca9bd876fe8f15ff28153661c6ba0a (fails)
    drm/i915: Fixup legacy plane->crtc link for initial fb config

==Bug detailed description==
-----------------------------
Consult Damien, as far as he knows: we don't have anything to do on kernel
driver on SKL for (system) memory self-refresh and the WM programming is
enough.

The bug just debugfs file does not update to support new platforms.

If this debugfs file can be enable, will greatly help QA verify the MSR/WM
funcitonality.


==Reproduce steps==
---------------------------- 
1. Boot system into kernel and keep idleness
2. cat /sys/kernel/debug/dri/0/i915_sr_status
3. Debugfs file show: self-refresh: disabled

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