[Bug 61542] New: [HSW bisected] Desktop-EDP can not work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61542

          Priority: medium
            Bug ID: 61542
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW bisected] Desktop-EDP can not work
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: bingx.a.yan at intel.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 75619
  --> https://bugs.freedesktop.org/attachment.cgi?id=75619&action=edit
EDP-no-lightup.dmesg

Environment:
--------------------

HSW desktop hd environment:
 Shark Bay Desktop Beta SDP (Flathead Creek): C3 stepping (id=0x0412, rev 06),
Lynx Point 02 (B0 stepping) and Host bridge id=0x0c00 (rev 06) 4Cores/4Thread,
CPU i5-4570 3.2GHz, GT2 800MHz; BIOS version:
FC_Preproduction_Q87_5MB_BIOS-108_ME-9.0.0.1308 


Description:
--------------------
1.Connecting edp monitor and boot.
2.After showing the list of grub,edp monitor can not work.
3.Just on edp monitor and hsw-desktop.
4.Below is the result of bisect.

Bisect result:
--------------------
cc464b2a17c59adedbdc02cc54341d630354edc3 is the first bad commit
commit cc464b2a17c59adedbdc02cc54341d630354edc3
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date:   Fri Jan 25 16:59:16 2013 -0200

    drm/i915: set TRANSCODER_EDP even earlier

    Instead of setting it at the beginning of haswell_crtc_mode_set, let's
    set it at the beginning of intel_crtc_mode_set. When
    intel_crt_mode_set calls drm_vblank_pre_modeset we already need to
    have the transcoder_edp correctly set, because eventually
    drm_vblank_pre_modeset calls functions that call i915_pipe_enabled
    from i915_irq.c, which will read PIPECONF(cpu_transcoder).

    This is a bug that affects us since we added support for
    TRANSCODER_EDP, but I was only able to see the problem after
    suspending a machine with the power well disabled (got an "unclaimed
    register" error.

    Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Reviewed-by: Jani Nikula <jani.nikula at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>





I attached the dmesg.

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