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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from David Weinehall <david.weinehall at intel.com> ---
Something that make a lot of difference here:

How is the display connected, and what kind of display is it?

eDP, DP, HDMI, CRT?

Do you have more than one display connected? Any adapters, or is the display
connected using its native mode?

I'm not sure whether the screen resolution affects things in any significant
manner, but that might be useful information too.

As can be seen from the log,

Mar 25 18:30:21 KBLU1 kernel: [    1.449273]
[drm:intel_dp_init_panel_power_sequencer] panel power up delay 200, power down
delay 50, power cycle delay 600
Mar 25 18:30:21 KBLU1 kernel: [    1.449274]
[drm:intel_dp_init_panel_power_sequencer] backlight on delay 1, panel off delay
200

The backlight off-delay is 200ms and the display power down delay is 50ms.
That makes the target of 62.5ms totally unrealistic; with such delays a target
of 300ms is realistic (and since we hit 285ms that seems reasonable).

As far as resume goes, backlight on delay is 1ms and panel on delay is 200ms,
so the target is still unrealistic, however there's definitely a larger gap
here. On resume, however, we also do much more work, so we definitely should
expect to use more time than for suspend. I cannot say without examining the
code further how much we can shave off from the current times, but as long as
we have a panel on delay of 200ms we can definitely not expect to meet a target
of 187.5ms...

Just my 2¢

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