Disable SATA LPM (Link Power Management)

[basti]

Hello,
is there a way to disable LPM for mv_sata driver by commandline?

Best Regards,
Basti

[Dan Ritter]

On Fri, Apr 06, 2018 at 07:05:00PM +0200, basti wrote:
> Hello,
> is there a way to disable LPM for mv_sata driver by commandline?
>

per-disk, not per-driver:

echo STATE > /sys/class/scsi_host/host0/link_power_management_policy


where STATE can be:

max_performance
medium_power
med_power_with_dipm
min_power WARNING: possible data loss

med_power_with_dipm appears in kernel 4.15.

In general, none of these are good ideas. Make backups. Consider
suspend-to-ram and suspend-to-disk if you don't need the system
active.

-dsr-

[basti]

On 06.04.2018 20:20, Dan Ritter wrote:
> On Fri, Apr 06, 2018 at 07:05:00PM +0200, basti wrote:
>> Hello,
>> is there a way to disable LPM for mv_sata driver by commandline?
>>
>
> per-disk, not per-driver:

thanks a lot, there seem to be problem with the driver mv_sata so i need
to disable than before system is detect the drives.

kernel till 3.8.12-1 work, after that there are problems like

[ 119.129462] ata2: hard resetting link
[ 119.641981] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 119.782055] ata2.00: configured for UDMA/33
[ 119.786288] ata2: EH complete
[ 119.789502] ata2.00: exception Emask 0x10 SAct 0x1 SErr 0x0 action
0x6 frozen
[ 119.796682] ata2.00: edma_err_cause=00000280 pp_flags=00000003,
parity error, EDMA self-disable
[ 119.805407] ata2.00: failed command: READ FPDMA QUEUED
[ 119.810573] ata2.00: cmd 60/08:00:00:00:00/00:00:00:00:00/40 tag 0
ncq 4096 in
[ 119.810573] res 50/00:ff:ff:ff:ff/00:ff:ff:ff:ff/ff Emask
0x10 (ATA bus error)
[ 119.825777] ata2.00: status: { DRDY }

[Dan Ritter]

Hope this helps.

If it doesn't, I recommend replacing SATA cables.

-dsr-