Re: [PATCH] ata: libata-core: Disable LPM on Silicon Motion MD619HXCLDE3TC

[Niklas Cassel <cassel@kernel.org>]

On Wed, Nov 26, 2025 at 04:48:09PM +0800, Yihang Li wrote:
> Hi Niklas,
> 
> On 2025/11/25 20:27, Niklas Cassel wrote:
> > Ok, really nice that we have a patch that fixes your problem.
> > 
> > However, like I wrote in the comment section:
> > 
> > Before we apply this patch, it would be nice if you could try another SSD,
> > that supports LPM (HIPM and DIPM) with your AHCI controller:
> > Huawei Technologies Co., Ltd. HiSilicon AHCI HBA [19e5:a235] (rev 30)
> > 
> > Note: You can see if your drive supports HIPM and DIPM from the
> > ata_dev_print_features() print to dmesg during boot, e.g.:
> > ata6.00: Features: Trust Dev-Sleep HIPM DIPM NCQ-sndrcv NCQ-prio
> > 
> > Just so we can verify that it is the MD619HXCLDE3TC SSD that is not
> > handling LPM correctly, and that it is not the AHCI HBA that is at fault.
> > 
> > E.g. there have been some weird bugs with this AHCI controller before,
> > see e.g. 234e6d2c18f5 ("ata: ahci: Disable SXS for Hisilicon Kunpeng920").
> > 
> > 
> > 
> > Do you have any other drive, other than MD619HXCLDE3TC and MD619GXCLDE3TC,
> > which supports LPM, and you can see that the drive works as intended,
> > with LPM enabled, so we can be certain that it is not the HBA that has
> > broken LPM support?
> > 
> 
> I checked all the drives I own, but unfortunately, none of them support LPM (HIPM and DIPM).
> :(

Well, it should be sufficient that they support either HIPM and DIPM.

Ideally, they should support the same as:
MD619HXCLDE3TC and MD619GXCLDE3TC.
(Not sure if they supported HIPM and DIPM or only one of them).

But the device should work fine to read / write / mount, etc. without showing
the same errors as you got with MD619HXCLDE3TC and MD619GXCLDE3TC.


Kind regards,
Niklas