Re: [PATCH #upstream-fixes, -stable] ata_piix: add workaround for Samsung DB-P70

[Mark Lord <liml@rtr.ca>]

Tejun Heo wrote:
> Samsung DB-P70 somehow botched the first ICH9 SATA port.  The board
> doesn't expose the first port but somehow SStatus reports link online
> while failing SRST protocol leading to repeated probe failures and
> thus long boot delay.
> 
> Because the BIOS doesn't carry any identifying DMI information, the
> port can't be blacklisted safely.  Fortunately, the controller does
> have subsystem vendor and ID set.  It's unclear whether the subsystem
> IDs are used only for the board but it can be safely worked around by
> disabling SIDPR access and just using SRST works around the problem.
> Even when the workaround is triggered on an unaffected board the only
> side effect will be missing SCR access.

..

A suggestion, then.  As a follow-up patch, would it be possible
to drop the workaround kludge, and restore the missing SCR access,
__after the first time that a drive is detected on that port__?

This way, there won't be any funny business for cases where
the same ID might occur on different (non-botched) hardware ?

Probably overkill, though.  :)

Cheers