Re: linux: sata_nv: adma support

[Mark Lord]

On 15-08-01 09:45 PM, Robert Hancock wrote:
> On Sat, Aug 1, 2015 at 2:09 PM, Pali RohÃr <pali.rohar@xxxxxxxxx> wrote:
> > On Thursday 25 December 2014 07:22:13 Robert Hancock wrote:
> > > On Tue, Dec 23, 2014 at 1:51 PM, Pali RohÃr <pali.rohar@xxxxxxxxx>
> > > wrote:
> > > > Hello,
> > > >
> > > > I have nvidia nforce4 motherboard with nvidia sata controller:
..
> > > It looks like something is trying to issue a command to disable APM
> > > power management on the drive, and the command fails (likely because
> > > it doesn't support that command).
..
> >   /sbin/hdparm -B254 $DRIVE
> >
> > And that -B254 cause above error message in dmesg log. Output from
> > hdparm is:
> >
> >   /dev/sda:
> >    setting Advanced Power Management level to 0xfe (254)
> >    APM_level      = not supported
..
> >   $ sudo hdparm -I /dev/sda | grep -i power
> >              *    Power Management feature set

That's not the same as APM ("Advanced" Power Management).

> However, these NVIDIA SATAs are black boxes, and rather buggy ones at that,
> so it's possible there's an unknown issue there.

I wonder if NVIDIA simply bought out the IP from Pacific Digital
when they went bust?  Pacific Digital invented the original "ADMA",
and the pdc_adma.c driver in the kernel knows all about it.
If the IP is pretty similar (identical?) then we could probably
improve things.

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