Re: [PATCH v4] ata: libata: disable LPM for WDC WD20EFAX-68FB5N0 hard drives

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ke 14.5.2025 klo 20.57 Niklas Cassel (cassel@xxxxxxxxxx) kirjoitti:
> > Yes, but for some reason now I get different results. I wonder what's
> > Now with vanilla 6.14.5 and configuration:
> > sata ports 5,6 -> WDC WD5000AAKX-001CA0
> > sata ports 3,4 -> WDC WD20EFAX-68FB5N0
> > I get:
...
> Well we still see:
> > ATA device, with non-removable media
> >     Model Number:       WDC WD20EFAX-68FB5N0
> >     Firmware Revision:  82.00A82
> > Commands/features:
> >     Enabled    Supported:
> >        *    Host-initiated interface power management
> >             Device-initiated interface power management
>
> This drive supports HIPM and DIPM,
> but only HIPM has been enabled. (Which does not make sense since
> lpm-pol 3 includes DIPM...)
>
> I have no idea what is going on here...

Hello Niklas!

 I rebooted and exactly the same configuration gives now
Device-initiated interface power management on for both WD20EFAX. Also
tested on 6.8.12, on which Device-initiated interface power management
is off for both drives, as before.

> I would add some debug prints around:
> https://github.com/torvalds/linux/blob/v6.15-rc6/drivers/ata/libata-eh.c#L3512-L3520
Good idea there is something weird going on.

> Did you do something with this drive?
Nope.
> Was this perhaps the drive that got timeout? and for some reason
> the timeouts caused DIPM to get disabled?
No, no timeouts.
> Did you get any timeouts on the other drive of the same model (/dev/sda) ?
None!

Best regards,
Mikko
> even though it claims support for it, and you are using lpm-pol 3.
>
>
> Kind regards,
> Niklas




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