Re: [PATCH 2/2] ahci: only attach ICH6-M if it's in SATA mode

[Paul Bolle <pebolle@tiscali.nl>]

On Mon, 2013-12-16 at 10:51 -0500, Tejun Heo wrote:
> I'm not quite sure about this one.  The patch seems correct on the
> surface but given how old ich6 is at this point, the general
> crappiness of BIOS on ahci front in that era, and that the existing
> code has been working fine for all these years make me very reluctant
> to change it.  e.g. I don't think CLASS_STORAGE_SATA was the only one.
> They used different class for raid too.

Well, raid should only be relevant for ICH6R (which has its own device
ID). The datasheet I've been staring at suggests that ICH6-M is
hardwired to either use PCI_CLASS_STORAGE_SATA or PCI_CLASS_STORAGE_IDE.

> It should be able to figure
> out things given enough test cases but I don't think we have that
> anymore and the benefit (avoding probe failure messages) doesn't seem
> to justify the risk.

That's your call, obviously. And I don't think that hardware like this
is used widely to run release candidates, if at all, so we can't even
consider a see-who-screams-when-their-setup-breaks approach.

Thanks,


Paul Bolle