[Bug 90868] New: [BYT/BSW Bisected] Suspend Resume time increase to 6000+ ms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90868

            Bug ID: 90868
           Summary: [BYT/BSW Bisected] Suspend Resume time increase to
                    6000+ ms
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116315
  --> https://bugs.freedesktop.org/attachment.cgi?id=116315&action=edit
suspend resume time failure dmesg

==System Environment==       
-----------------------------------------------------
Kernel Regression: Yes
Non-working platforms: BYT/HSW


Bisect result show :
490f400db5d886fc28566af69b02f6497f31be4b is the first bad commit
commit 490f400db5d886fc28566af69b02f6497f31be4b
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Mon Jun 1 12:50:05 2015 +0200

    drm/i915: Make intel_display_suspend atomic, v2.

    Calculate all state using a normal transition, but afterwards fudge
    crtc->state->active back to its old value. This should still allow
    state restore in setup_hw_state to work properly.

    Calling intel_set_mode will cause intel_display_set_init_power to be
    called, make sure init_power gets set again afterwards.

    Changes since v1:
    - Fix to compile with v2 of the patch that adds intel_display_suspend.
    - Add intel_display_set_init_power.
    - Set return value to int to allow error checking.

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

:040000 040000 b53b1c05451c72787a26e1efc85c0e544ae1ec94
1e8df3b7f16307d9e637276c10c54e                                                 
                                                             3b94850486 M   
drivers

==Bug detailed description==
Suspend resume time is too large: 6000+ ms


==Reproduce steps==
----------------------------
1. Boot up system with initcall_debug drm.debug=0xe kernel parameter
2. echo 0 > /sys/class/rtc/rtc0/wakealarm 
echo +20 > /sys/class/rtc/rtc0/wakealarm 
echo mem > /sys/power/state
3. run attached script.

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