[Bug 72211] New: [HSW]S3 response time larger than expected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72211

          Priority: medium
            Bug ID: 72211
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]S3 response time larger than expected
        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 90071
  --> https://bugs.freedesktop.org/attachment.cgi?id=90071&action=edit
dmseg after a round of s3

Environment:
--------------------
Kernel: (drm-intel-nightly)be46ffd48ba34189336c6fe420ff3370dcd36c60
Some additional commit info:
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Fri Nov 29 13:21:49 2013 +0200

    drm/i915: Fix port name in vlv_wait_port_ready() timeout warning

Bug detailed description:
-----------------------------
When I test on a HSW ULT machine with a eDP monitor , 3 response time of i915
init,suspend and resume are quite larger than expected. 
I list the result below:
       Acquire initcall time: 1672.811 msecs 
       Acquire suspend time: 1093.865 msecs  
       Acquire resume time: 625.535 msecs 

Machin Info: Lenovo idealpad u330p
BIOS Version: 7CCN15WW
CPU: Intel(R) Core(TM) i3-4010U CPU @1.70GHZ

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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