Re: linux: sata_nv: adma support

From: Mark Lord
Date: Tue Aug 25 2015 - 07:28:40 EST

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>

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:

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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