Hans Petter Selasky 6a55ff4866 Ensure waiting loops terminate during cold boot. This fixes boot with
MacBookPro and i915kms_load="YES" in /boot/loader.conf.

A lowlevel timeout in one of the display ports caused an infinite wait
because a ticks/jiffies comparison was constant. The clock subsystem
which makes ticks/jiffies increment is started after the initial
driver probing is done. Refer to sys/kernel.h and SI_SUB_DRIVERS vs
SI_SUB_CLOCKS .

Discussed with:	kmacy @
2016-05-10 18:18:29 +00:00
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