[Bug 65880] [HSW]igt/module_reload randomly causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65880

--- Comment #2 from shui yangwei <yangweix.shui at intel.com> ---
bisect shows: commit eda63ffb906c2fb3b609a0e87aeb63c0f25b9e6b
 is the first bad commit. 
commit eda63ffb906c2fb3b609a0e87aeb63c0f25b9e6b
Author: Ben Widawsky <ben at bwidawsk.net>
AuthorDate: Tue May 28 19:22:26 2013 -0700
Commit: Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Fri May 31 20:54:16 2013 +0200

    drm/i915: Add PM regs to pre/post install

    At the moment, these values are wiped out anyway by the rps
    enable/disable. That will be changed in the next patch though.

    v2: Add post install setup to address issue found by Damien in the next
    patch.
    replaced
    WARN_ON(dev_priv->rps.pm_iir != 0);
    with rps.pm_iir = 0;

    With the v2 of this patch and the deferred pm enabling (which changed
    since the original patches) we're now able to get PM interrupts before
    we've brought up enabled rps. At this point in boot, we don't want to do
    anything about it, so we simply ignore it. Since writing the original
    assertion, the code has changed quite a bit, and I believe removing this
    assertion is perfectly safe.

    Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
    Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>
    [danvet: I don't agree with the justification to drop the WARN and
    added a FIXME to that effect.]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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