[Bug 77565] [BDW regression]igt/pm_pc8 subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77565

--- Comment #2 from Guo Jinxian <jinxianx.guo at intel.com> ---
fc1744ff7ba63cabf858c55217382104e9dd94ed is the first bad commit
commit fc1744ff7ba63cabf858c55217382104e9dd94ed
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Apr 10 09:01:40 2014 +0200

    Revert "drm/i915: fix infinite loop at gen6_update_ring_freq"

    This reverts commit 4b28a1f3ef55a3b0b68dbab1fe6dbaf18e186710.

    This patch duct-tapes over some issue in the current bdw rps patches
    which must wait with enabling rc6/rps until the very first batch has
    been submitted by userspace.

    But those patches aren't merged yet, and for upstream we need to have
    an in-kernel emission of the very first batch. I shouldn't have
    merged this patch so let's revert it again.

    Also Imre noticed that even when rps is set up normally there's a
    small window (due to the 1s delay of the async rps init work) where we
    could runtime suspend already and blow up all over the place. Imre has
    a proper fix to block runtime pm until the rps init work has
    successfully completed.

    Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Cc: Imre Deak <imre.deak at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 c7c7c9b7e4dc136a3ac650c847e65f6913e83ba4
6e22952e0db97d29757b13b0a1dc6a4392d86f95 M      drivers


Reverted this commit, the case passed. Thanks.

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