[Bug 105622] New: i915_init takes over 100 ms

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 105622
           Summary: i915_init takes over 100 ms
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

For a quick boot, it is important, that modules load as fast as possible.
Currently on a Dell XPS 13 9370 with , according to `initcall_debug` the
function `i915_init` takes 130 ms.

```
$ lspci -s 02.0 -nn
00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620
[8086:5917] (rev 07)
$ 
$ sudo dmesg
[…]
[    2.260353] calling  i915_init+0x0/0x59 [i915] @ 301
[…]
[    2.320132] fb: switching to inteldrmfb from EFI VGA
[    2.320147] Console: switching to colour dummy device 80x25
[    2.320732] [drm] Replacing VGA console driver
[    2.323454] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    2.323455] [drm] Driver supports precise vblank timestamp query.
[    2.330618] i915 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    2.331609] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin
(v1.4)
[    2.338525] [drm] Initialized i915 1.6.0 20171222 for 0000:00:02.0 on minor
0
[…]
[    2.392787] initcall i915_init+0x0/0x59 [i915] returned 0 after 129294 usecs
[    2.392789] snd_hda_intel 0000:00:1f.3: enabling device (0000 -> 0002)
[    2.392925] initcall azx_driver_init+0x0/0xfd8 [snd_hda_intel] returned 0
after 123877 usecs
[    2.393932] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
```

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