042a243978
the commit message; as actually implemented, the intent is to retry
up to 2 ms for controllers to enable bus power.
Noticed by: ian@, rgrimes@
Additional note: Among others, the problem addressed by r320577 is
the APL32 ("Storage Controllers May Not Be Power Gated") erratum.
Hopefully, along with r318282, r320577 works around the remaining
problems seen with Intel Apollo Lake eMMC and SDXC controllers.
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