[Bug 69250] New: [Baytrail-M] eDP responsiveness issues of slow i915 module init , slow resume time and slow suspend time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69250

          Priority: medium
            Bug ID: 69250
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Baytrail-M] eDP responsiveness issues of  slow i915
                    module init , slow resume time and slow suspend time
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: yangweix.shui at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 85690
  --> https://bugs.freedesktop.org/attachment.cgi?id=85690&action=edit
dmesg: 3 response time

Environment:
--------------------
Kernel: (drm-intel-next-queued)6c4a8962a4a078cacfc8eb5d4bd79f6343b8cd7a
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Tue Sep 10 14:54:42 2013 -0700
    drm/i915/vlv: re-enable hotplug detect based probing on VLV/BYT


lspci:
--------------------
00:02.0 VGA compatible controller: Intel Corporation ValleyView Gen7 (rev 0a)


Description:
--------------------
On Baytrail, 3 response time of i915 init,suspend and resume are quite larger
than expected. I list the result below:

Acquire initcall time:
1661.503 msecs
Acquire suspend time:
831.419 msecs
Acquire resume time:
9375.159 msecs


Another IVB mobile(Apple MacBook Pro) 3 response time of eDP:
Acquire initcall time:
2465.873 msecs
Acquire suspend time:
1304.496 msecs
Acquire resume time:
1036.836 msecs


Steps:
--------------------
1. booting with  kernel command: "initcall_debug drm.debug=0xe"
2. dmesg | grep -i -e "i915_init|PM:.*complete|00:02.0+"
3. calculate related times

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