[Bug 72210] New: [Regression BYT] S3 response time large than before

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72210

          Priority: medium
            Bug ID: 72210
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Regression BYT] S3 response time large than before
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: qingshuai.tian at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 90070
  --> https://bugs.freedesktop.org/attachment.cgi?id=90070&action=edit
dmesg after a round of s3

Environment:
--------------------
Kernel: (drm-intel-nightly)013133c43b2595ad72d1c66c7afa31dca82132d4
Some additional commit info:
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Nov 29 15:52:10 2013 +0100

    drm-intel-nightly: 2013y-11m-29d-15h-52m-00s integration manifest

Description:
--------------------
On Baytrail, 3 response time of i915 init,suspend and resume are quite larger
than before. It's a regression. 
I attach the dmesg in the attachment.
The  previous response time we get:(we can check it in comment 7 of bug 69250
):
       Acquire initcall time: 1386 msecs 
       Acquire suspend time: 825 msecs  
       Acquire resume time: 767 msecs 

The response time I get this time is as follows:
        Acquire initcall time: 3084msecs
        Acquire suspend time: 944 msecs
        Acquire resume time: 1100 msecs

Reproduce Steps:
--------------------
1. Rebuild kernel with option CONFIG_PM_TRACE.
2. Boot system with kernel command: initcall_debug drm.debug=0xe
3. perform a suspend-resume cycle by executing 'echo mem > /sys/power/state'
4. The dump the dmesg with the following command:
   dmesg | grep -i -e "i915_init\|PM:.*complete\|00:02.0+"

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