[Bug 65922] New: [HSW ULT desktop mobile bisected] Slow resume time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65922

          Priority: medium
            Bug ID: 65922
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT desktop mobile bisected] Slow resume time
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------
Platform: Haswell ULT, Haswell desktop, Haswell mobile
Kernel: (drm-intel-next-queued)04c23c6203954cc38a34c86b4dd0686a1b1a53de
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date:   Wed Jun 12 17:27:30 2013 -0300

Bug detailed description:
-------------------------
I did suspend-resume cycle of S3 on latest drm-intel-next-queued kernel, and
found that resume time slower than expectation. This happens on all HSW
platforms, and I have bisected it on HSW desktop, and it's applicable for the
other two platforms. 

Bisect info:
-------------------------
24576d23976746cb52e7700c4cadbf4bc1bc3472 is the first bad commit

commit 24576d23976746cb52e7700c4cadbf4bc1bc3472
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Tue Mar 26 09:25:45 2013 -0700

    drm/i915: enable VT switchless resume v3

    With the other bits in place, we can do this safely.

    v2: disable backlight on suspend to prevent premature enablement on resume
    v3: disable CRTCs on suspend to allow RTD3 (Kristen)

    Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
    Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


Following table shows the bad value(from first bad commit) compared with good
value(from first-bad-commit's father commit) of HSW desktop:

resume time:
-------------------------------------
Display ports    eDP               HDMI                  DP
Bad            710.256msecs       262.942msecs       190.676msecs 
Good         52.750msecs       56.695msecs          67.484msecs

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