[Bug 105622] i915_init takes over 100 ms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105622

--- Comment #23 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
With Linux 4.16-rc7+ (master branch), and the patch applied, on a Lenovo X60
`i915_init()` still takes 87 milliseconds according to `initcall_debug`.

```
[    1.453313] calling  i915_init+0x0/0x56 [i915] @ 98
[    1.453736] pci 0000:00:00.0: Intel 945GM Chipset
[    1.453752] pci 0000:00:00.0: detected gtt size: 262144K total, 262144K
mappable
[    1.454321] pci 0000:00:00.0: detected 8192K stolen memory
[    1.454430] checking generic (d0000000 300000) vs hw (d0000000 10000000)
[    1.454432] fb: switching to inteldrmfb from VESA VGA
[    1.454489] Console: switching to colour dummy device 80x25
[    1.454733] [drm] Replacing VGA console driver
[    1.514163] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.514166] [drm] Driver supports precise vblank timestamp query.
[    1.514650] i915 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    1.529553] [drm] RC6 disabled, disabling runtime PM support
[    1.529637] [drm] initialized overlay support
[    1.530520] [drm] Initialized i915 1.6.0 20171222 for 0000:00:02.0 on minor
0
[    1.530811] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    1.536777] clocksource: timekeeping watchdog on CPU0: Marking clocksource
'tsc-early' as unstable because the skew is too large:
[    1.536784] clocksource:                       'hpet' wd_now: 22a9b5a
wd_last: 10310d8 mask: ffffffff
[    1.536786] clocksource:                       'tsc-early' cs_now: 42dfe9b3e
cs_last: 3fdd506a0 mask: ffffffffffffffff
[    1.536945] clocksource: Switched to clocksource hpet
[    1.542606] acpi device:04: registered as cooling_device3
[    1.542730] input: Video Bus as
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input5
[    1.543404] initcall i915_init+0x0/0x56 [i915] returned 0 after 87888 usecs
```

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