[Bug 94722] [SKL/KBL] Init time is high

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94722

--- Comment #25 from Luis Botello <luis.botello.ortega at intel.com> ---
I have tested this issue on KBL wit the following config:

|=== Software information ===|

 ++ Kernel version                      : 4.6.0-rc7-patch-82422+
 ++ Linux distribution                  : Ubuntu 15.10
 ++ Architecture                        : 64-bit
 ++ xf86-video-intel version            : 2.99.917
 ++ Xorg-Xserver version                : 1.18.99.1
 ++ DRM version                         : 2.4.68
 ++ Cairo version                       : 1.15.2
 ++ Intel GPU Tools version             : Tag
[intel-gpu-tools-1.14-319-gb88bce4] / Commit [b88bce4]
 ++ Kernel driver in use                : i915
 ++ Hardware acceleration               :
 ++ Bios revision                       : 36.2
 ++ KSC revision                        : 1.20


 |=== Hardware information ===|

 ++ Platform                            : KBL (RVP7)
 ++ Motherboard model                   : Kabylake Client platform
 ++ Motherboard type                    : Skylake U DDR3L RVP7 Laptop
 ++ Motherboard manufacturer            : Intel Corporation
 ++ CPU family                          : Other
 ++ CPU information                     : Genuine Intel(R) CPU 0000 @ 2.60GHz
 ++ GPU Card                            : Intel Corporation Device 5916
(prog-if 00 [VGA controller])

 |== Kernel parameters ==|

 quiet splash drm.debug=0xe i915.preliminary_hw_support=1 initcall_debug
i915.fastboot=1


and i get the following results:

results without i915.fastboot=1 module parameter

init:
[    1.727641] initcall i915_init+0x0/0x99 [i915] returned 0 after 387249 usecs

Suspend:
[  180.621025] call 0000:00:02.0+ returned 0 after 295806 usecs
[  180.621118] PM: suspend of devices complete after 321.303 msecs

REsume:
[  180.639935] call 0000:00:02.0+ returned 0 after 13731 usecs
[  180.651224] call 0000:00:02.0+ returned 0 after 1 usecs
[  180.903152] call 0000:00:02.0+ returned 0 after 18360 usecs
[  180.922977] call 0000:00:02.0+ returned 0 after 6197 usecs
[  181.472492] call 0000:00:02.0+ returned 0 after 498686 usecs
[  181.472629] PM: resume of devices complete after 510.904 msecs


======================================================================================

results with i915.fastboot=1 module parameter


init:
[    1.718740] initcall i915_init+0x0/0x99 [i915] returned 0 after 385555 usecs

Suspend:
[  111.358279] call 0000:00:02.0+ returned 0 after 1214290 usecs
[  111.358384] PM: suspend of devices complete after 1251.146 msecs

Resume:
[  111.378979] call 0000:00:02.0+ returned 0 after 15174 usecs
[  111.383042] call 0000:00:02.0+ returned 0 after 0 usecs
[  111.635269] call 0000:00:02.0+ returned 0 after 11823 usecs
[  111.661837] call 0000:00:02.0+ returned 0 after 6190 usecs
[  112.216082] call 0000:00:02.0+ returned 0 after 503149 usecs
[  112.216266] PM: resume of devices complete after 515.524 msecs

As additional comment, the platform only has an eDP panel attached, and kernel
has the patch -82422-. After adding the parameter i915.fastboot=1 the platform
is able to boot up, but eDP gets blank screen.

You can find the full dmesg_Patch_KBL_U.log as attached file.

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