[Bug 109985] [SNB] INTEL_DEBUG=nohiz is likely broken for depth/stencil buffers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109985

            Bug ID: 109985
           Summary: [SNB] INTEL_DEBUG=nohiz is likely broken for
                    depth/stencil buffers
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: nanleychery at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

For SNB, INTEL_DEBUG=nohiz seems to be broken in two places:

1. In miptree_create() in intel_mipmap_tree.c. Trying to create a depth/stencil
buffer will cause a depth miptree to be created without stencil.

2. In isl_genX(emit_depth_stencil_hiz_s) in isl_emit_depth_stencil.c. Emitting
a depth/stencil buffer instruction will unconditionally force HiZ on.

I haven't tested/verified these observations.

mesa version: ae77f1236862e73c1ac250898924c648d481bda4

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