[Bug 75077] [Regression IVB] Apple miniDP-to-DP can be detected but can't light up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75077

Qingshuai Tian <qingshuai.tian at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from Qingshuai Tian <qingshuai.tian at intel.com> ---
I finished the bisect and it shows:

eb1bfe807cb7b62a326fa20df5e3118a32c6f923 is the first bad commit
commit eb1bfe807cb7b62a326fa20df5e3118a32c6f923
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Wed Feb 12 12:26:25 2014 -0800

    drm/i915: allow re-use BIOS connector config for initial fbdev config v3

    The BIOS or boot loader will generally create an initial display
    configuration for us that includes some set of active pipes and
    displays.  This routine tries to figure out which pipes and connectors
    are active and stuffs them into the crtcs and modes array given to us by
    the drm_fb_helper code.

    The overall sequence is:
      intel_fbdev_init - from driver load
        intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
        drm_fb_helper_init - build fb helper structs
        drm_fb_helper_single_add_all_connectors - more fb helper structs
      intel_fbdev_initial_config - apply the config
        drm_fb_helper_initial_config - call ->probe then register_framebuffer()
            drm_setup_crtcs - build crtc config for fbdev
              intel_fb_initial_config - find active connectors etc
            drm_fb_helper_single_fb_probe - set up fbdev
              intelfb_create - re-use or alloc fb, build out fbdev structs

    v2: use BIOS connector config unconditionally if possible (Daniel)
        check for crtc cloning and reject (Daniel)
        fix up comments (Daniel)
    v3: use command line args and preferred modes first (Ville)

    Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Tested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    [danvet: Re-add the WARN_ON for a missing encoder crtc - the state
    sanitizer should take care of this. And spell-ocd the comments.]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 dbe7ef821ba404c994fbc579461b7e0d4febf10a
1b40c56483f03c15ae495a85a78fe740beeeb0e9 M        drivers

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