Port Multiplier drives not always all found on cold plug

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Tejun,

Since enabling PMP support in sata_mv, there have been some recent
reports of not all drives being found on a PM.

I can reproduce this here myself, too:

(1) silicon image PM with four drives attached.
(2) power-down the PM.
(3) rmmod sata_mv ; modprobe sata_mv (latest upstream).
(4) plug (power off) PM into sata_mv card (7042 chipset).
(5) power on the PM.
(6) watch only 2-3 of the four drives get found.

If the PM was already powered on in advance, then all drives are found.
sata_mv relies entirely on libata-*.c for PMP resets/enumerations,
so I'm not sure that the problem is in sata_mv.

Any ideas?
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