linux-kernel - Re: [PATCH] PCI: PM: Extend Elo i2 quirk to all systems using Continental Z2 board

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Date:   Thu, 8 Jun 2023 15:31:58 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ondrej Zary <linux@...y.sk>
Cc:     rjw@...ysocki.net, gottwald@...l.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org,
        mika.westerberg@...ux.intel.com
Subject: Re: [PATCH] PCI: PM: Extend Elo i2 quirk to all systems using
 Continental Z2 board

[+cc Stefan]

s|PCI: PM:|PCI/PM| in the subject to match history.

On Fri, May 19, 2023 at 10:58:53AM +0200, Ondrej Zary wrote:
> The quirk for Elo i2 is also needed by EloPOS E2/S2/H2 which uses the
> same Continental Z2 board. Change the quirk to match the board instead
> of system.

I would mention 92597f97a40b ("PCI/PM: Avoid putting Elo i2 PCIe Ports in 
D3cold") here since it has more details that might be relevant.

Is there a problem report we can point to here?  Oh, I see you chimed
in on https://bugzilla.kernel.org/show_bug.cgi?id=215715.  Let's
include that link here, too.

This also needs a Signed-off-by tag; see
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=v6.3#n363

Maybe also a stable tag since 92597f97a40b had one.

After we have the above tweaks, I plan to apply this unless somebody
objects.

Bjorn

> ---
>  drivers/pci/pci.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 5ede93222bc1..c779eb4d7fb8 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -2949,13 +2949,13 @@ static const struct dmi_system_id bridge_d3_blacklist[] = {
>  	{
>  		/*
>  		 * Downstream device is not accessible after putting a root port
> -		 * into D3cold and back into D0 on Elo i2.
> +		 * into D3cold and back into D0 on Elo Continental Z2 board
>  		 */
> -		.ident = "Elo i2",
> +		.ident = "Elo Continental Z2",
>  		.matches = {
> -			DMI_MATCH(DMI_SYS_VENDOR, "Elo Touch Solutions"),
> -			DMI_MATCH(DMI_PRODUCT_NAME, "Elo i2"),
> -			DMI_MATCH(DMI_PRODUCT_VERSION, "RevB"),
> +			DMI_MATCH(DMI_BOARD_VENDOR, "Elo Touch Solutions"),
> +			DMI_MATCH(DMI_BOARD_NAME, "Geminilake"),
> +			DMI_MATCH(DMI_BOARD_VERSION, "Continental Z2"),
>  		},
>  	},
>  #endif
> -- 
> 2.39.2
>