Tejun Heo wrote:
* Proposed solution
It seems that the only solution is to make use of the PCS presence bits
somehow. It is know that 6300ESB family of controllers have flaky
presence bits (ata_piix marks them with PIIX_FLAG_IGNORE_PCS), but I
couldn't find any document/errata for PCS bits for any other
controllers. So, we can use PCS for all !PIIX_FLAG_IGNORE_PCS
controllers or take a conservative approach and make use of it only on
cases where ghosting problem is reported (ICH7 and 8, I guess. Can
anyone test 6?).
Please note that we already use some use of the PCS value when probing
SATA port. If its value is zero, we skip the port. It's done this way
mainly due to historical reasons - until recently ata_piix didn't have
MAP tables to map PM/PS/SM/SS to specific ports thus used the PCS values
in rougher form.
Jeff, what do you think?
Sounds sane...
Jeff
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