Re: [PATCH 2.6.23-rc4][reRESEND] ahci: RAID mode SATA patch for Intel Tolapai

[Jeff Garzik <jgarzik@pobox.com>]

Gaston, Jason D wrote:
> > -----Original Message-----
> > From: Gaston, Jason D
> > Sent: Friday, August 31, 2007 10:10 AM
> > To: 'Jeff Garzik'
> > Cc: linux-ide@vger.kernel.org; linux-kernel@vger.kernel.org
> > Subject: RE: [PATCH 2.6.23-rc4][reRESEND] ahci: RAID mode SATA patch
> for
> > Intel Tolapai
> >
> > This device has both AHCI and RAID modes that use the ahci driver.
> Only
> > the RAID mode DID's are being added as the PCI class code support will
> > cover the AHCI mode.  Looking at the Generic, PCI class code support
> > section, it uses "board_ahci".  I assumed that they should be the same
> as
> > the generic class code support is working on this platform.
> >
> > Thanks,
> >
> > Jason
> >
> >
> > > -----Original Message-----
> > > From: Jeff Garzik [mailto:jgarzik@pobox.com]
> > > Sent: Friday, August 31, 2007 12:47 AM
> > > To: Gaston, Jason D
> > > Cc: linux-ide@vger.kernel.org; linux-kernel@vger.kernel.org
> > > Subject: Re: [PATCH 2.6.23-rc4][reRESEND] ahci: RAID mode SATA patch
> for
> > > Intel Tolapai
> > >
> > > Jason Gaston wrote:
> > > > Resend trying to remove 8-bit characters in the email.
> > > >
> > > > This patch adds the Intel Tolapai RAID controller DID's for SATA
> > support.
> > > > Signed-off-by:  Jason Gaston <jason.d.gaston@intel.com>
> > > >
> > > > --- linux-2.6.23-rc4/drivers/ata/ahci.c.orig	2007-08-27
> > > 18:32:35.000000000 -0700
> > > > +++ linux-2.6.23-rc4/drivers/ata/ahci.c	2007-08-28
> > 16:58:11.000000000 -
> > > 0700
> > > > @@ -411,6 +411,8 @@
> > > >  	{ PCI_VDEVICE(INTEL, 0x292f), board_ahci_pi }, /* ICH9M */
> > > >  	{ PCI_VDEVICE(INTEL, 0x294d), board_ahci_pi }, /* ICH9 */
> > > >  	{ PCI_VDEVICE(INTEL, 0x294e), board_ahci_pi }, /* ICH9M */
> > > > +	{ PCI_VDEVICE(INTEL, 0x502a), board_ahci }, /* Tolapai */
> > > > +	{ PCI_VDEVICE(INTEL, 0x502b), board_ahci }, /* Tolapai */
> > > Why did you not use board_ahci_pi?  Is the AHCI ports-implemented
> > > register unreliable on this platform?
>
> Jeff,
>
> Do I need to change this to board_ahci_pi or is it ok to leave it at
> board_ahci, which will be used by the AHCI class code devices?

You are the one who needs to answer this question ;-)

Most new Intel AHCI have a sane and reliable Ports-Implemented register 
value even across reset, unlike earlier ones or some clones.  For those, 
we use board_ahci_pi.

If PI is not reliable across reset or if BIOS is absent (yes we care 
about that case, when we do our own PCI resume for example), then you 
should use board_ahci.

	Jeff



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