[Bug 94995] New: NULL pointer dereference in intel_pipe_will_have_type() triggered from vlv_compute_dpll()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94995

            Bug ID: 94995
           Summary: NULL pointer dereference in
                    intel_pipe_will_have_type() triggered from
                    vlv_compute_dpll()
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: ville.syrjala at linux.intel.com
          Reporter: marius.c.vlad at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BYT
     i915 features: display/DSI

Created attachment 123030
  --> https://bugs.freedesktop.org/attachment.cgi?id=123030&action=edit
stacktrace

Reloading the module (tests/drv_module_reload) causes a NULL pointer
dereference on BYT. 

The culprit seems to be:

cd2d34d drm/i915: Setup DPLL/DPLLMD for DSI too on VLV/CHV

Check quickly and it seems that crtc_state->base.state is NULL when reloading
the driver.

>From the following integration manifest:
e51a1e3 drm-intel-nightly: 2016y-04m-15d-13h-26m-14s UTC integration manifest
234126c drm/i915: Reject 'Center' scaling mode for eDP/DSI on GMCH platforms
f4ee265 drm/i915: Hook up pfit for DSI
062efa5 drm/i915: Eliminate {vlv,bxt}_configure_dsi_pll()
47eacba drm/i915: Compute DSI PLL parameters during .compute_config()
cd2d34d drm/i915: Setup DPLL/DPLLMD for DSI too on VLV/CHV
da6110b drm/i915/bxt: PORT_PLL_REF_SEL bit should be set for all BXT variations
ab24353 drm-intel-nightly: 2016y-04m-15d-13h-02m-57s UTC integration manifest


Tried w/:

commit b1acc63c4301f12ef2ca31872d937641aaf3c9dc
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Mon Apr 18 18:56:14 2016 +0300

    drm-intel-nightly: 2016y-04m-18d-15h-55m-43s UTC integration manifest

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