linux-kernel - Re: Regression from 7627a0edef54 ("ata: ahci: Drop low power policy board type") on reboot (but not cold boot)

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Message-ID: <6d125c69-35b2-45b5-9790-33f3ea06f171@redhat.com>
Date: Thu, 13 Mar 2025 19:47:11 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Niklas Cassel <cassel@...nel.org>
Cc: Eric <eric.4.debian@...batoulnz.fr>,
 Salvatore Bonaccorso <carnil@...ian.org>,
 Mario Limonciello <mario.limonciello@....com>,
 Christoph Hellwig <hch@...radead.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Damien Le Moal <dlemoal@...nel.org>, Jian-Hong Pan <jhp@...lessos.org>,
 regressions@...ts.linux.dev, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, linux-ide@...r.kernel.org,
 Dieter Mummenschanz <dmummenschanz@....de>
Subject: Re: Regression from 7627a0edef54 ("ata: ahci: Drop low power policy
 board type") on reboot (but not cold boot)

Hi,

On 13-Mar-25 4:28 PM, Niklas Cassel wrote:
> Hello Hans,
> 
> On Thu, Mar 13, 2025 at 04:13:24PM +0100, Hans de Goede wrote:
>>>
>>> Considering that DIPM seems to work fine on the Maxtor drive, I guess your
>>> initial suggestion of a Samsung only quirk which only disables LPM on ATI
>>> is the best way?
>>
>> I have no objections against going that route, except that I guess this
>> should then be something like ATA_QUIRK_NO_DIPM_ON_ATI to not loose the
>> other LPM modes / savings? AFAIK/IIRC there still is quite some powersaving
>> to be had without DIPM.
> 
> I was thinking like your original suggestion, i.e. setting:
> ATA_QUIRK_NO_LPM_ON_ATI
> 
> for all the Samsung devices that currently have:
> ATA_QUIRK_NO_NCQ_ON_ATI
> 
> Considering that this Samsung device only supports DIPM
> (and not HIPM), I'm guessing the same is true for the other
> Samsung devices as well.

Ah I see ...

> So we might as well just do:
> ATA_QUIRK_NO_LPM_ON_ATI

Yes I agree and that will nicely work as a combination of
ATA_QUIRK_NO_LPM + ATA_QUIRK_NO_NCQ_ON_ATI functionality
so using tested code-paths in a slightly new way.

Regards,

Hans




> to disable both HIPM and DIPM
> (since only DIPM would have been enabled without this quirk anyway).
> 
> 
>> Yes the most severe problems do seem to come from that specific mix,
>> although the long list of other ATI controller quirks also shows those
>> controllers are somewhat finicky.
> 
> Definitely!
> 
> 
> Kind regards,
> Niklas
>