linux-kernel - Re: [PATCH 1/2] ata: ahci: Add force LPM policy quirk for ASUS B1400CEAE

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Date: Wed, 7 Feb 2024 14:35:25 +0800
From: Jian-Hong Pan <jhp@...lessos.org>
To: Niklas Cassel <cassel@...nel.org>
Cc: Dan Williams <dan.j.williams@...el.com>, Daniel Drake <drake@...lessos.org>, 
	Vitalii Solomonov <solomonov.v@...il.com>, Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	David Box <david.e.box@...ux.intel.com>, Damien Le Moal <dlemoal@...nel.org>, 
	Nirmal Patel <nirmal.patel@...ux.intel.com>, 
	Jonathan Derrick <jonathan.derrick@...ux.dev>, linux-ide@...r.kernel.org, 
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, linux@...lessos.org
Subject: Re: [PATCH 1/2] ata: ahci: Add force LPM policy quirk for ASUS B1400CEAE

Niklas Cassel <cassel@...nel.org> 於 2024年2月7日 週三 上午6:07寫道：
>
> On Tue, Feb 06, 2024 at 02:12:17PM +0100, Niklas Cassel wrote:
> > On Tue, Feb 06, 2024 at 04:39:02PM +0800, Jian-Hong Pan wrote:
> > > Niklas Cassel <cassel@...nel.org> 於 2024年2月5日 週一 下午7:33寫道：
>
> (snip)
>
> >
> > It seems that at least Intel AHCI controllers that also have Intel VMD
> > enabled break when this quirk is applied.
> >
> > I guess one way would be to do a:
> > git show c312ef176399:drivers/ata/ahci.c | grep "PCI_VDEVICE(INTEL"
> > and replace everything that is not: board_ahci_pcs7
> > with a board_ahci_pcs_quirk, board_ahci_low_power_pcs_quirk, and
> > board_ahci_avn_pcs_quirk, and after that change all board_ahci_pcs7
> > entries to board_ahci, and assume that entries added since c312ef176399
> > do not need the quirk.
> >
> > But it would be nice if someone from Intel could clean this up.
>
> While it would still be nice if someone cleaned up the intel_pcs_quirk.
>
>
> Jian-Hong, perhaps you can try my series:
> https://lore.kernel.org/linux-ide/20240206211352.1664816-1-cassel@kernel.org/
>
> Also available here:
> https://github.com/floatious/linux/tree/external-port-v2
>
> With that series, you should not need an explicit "board_ahci_low_power"
> entry for Tiger Lake to get working LPM.
>
> If fact, you want to ensure that you do not have any Tiger Lake entry in
> ahci_pci_tbl, as that will apply intel_pcs_quirk and break your platform.
>
> Testing is appreciated :)
>
> Let's hope that LPM is enabled and that you can also enter low-power
> C-states.

Yes!  That patch series binds LPM policy by default and avoids
disappeared SATA storage issue.

Thanks!
Jian-Hong Pan