[Bug 85924] [hsw DP-to-DVI] DP hot plug fails if booted without Monitor Attached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85924

--- Comment #47 from Jean Delvare <jdelvare at suse.de> ---
drm_probe_ddc() calls drm_do_probe_ddc_edid() which attempts probing up to 5
times. With this patch we will retry up to 25 times on I2C buses where no EDID
is present, which will certainly incur a noticeable delay.

Your patch adds a delay between attempts, which the original code doesn't have.
So if the patch really helps, maybe the proper fix would be to add this delay
in the retry loop already present in drm_do_probe_ddc_edid(). If we end up
doing that, please insert the delay _after_ the first attempt rather than
before it as your previous patch did, so that we don't suffer from the extra
delay when everything works fine (EDID probe succeeds at first attempt.)

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