linux-kernel - Re: [PATCH v3] PCI: apple: Set only available ports up

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Message-ID: <CAOgh=Fy6XsRFquqKMvMkbaCpowJf6twmRwkqoo_Fm1_O02n7bQ@mail.gmail.com>
Date:   Thu, 23 Mar 2023 10:19:00 +0000
From:   Eric Curtin <ecurtin@...hat.com>
To:     Janne Grunau <j@...nau.net>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        asahi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI: apple: Set only available ports up

On Thu, 23 Mar 2023 at 08:16, Janne Grunau <j@...nau.net> wrote:
>
> The Apple SoC devicetrees used to delete unused PCIe ports. Avoid to set
> up disabled PCIe ports to keep the previous behaviour. MacOS initialized
> also only ports with a known device.
>
> Use for_each_available_child_of_node instead of for_each_child_of_node
> which takes the "status" property into account.
>
> Link: https://lore.kernel.org/asahi/20230214-apple_dts_pcie_disable_unused-v1-0-5ea0d3ddcde3@jannau.net/
> Link: https://lore.kernel.org/asahi/1ea2107a-bb86-8c22-0bbc-82c453ab08ce@linaro.org/
> Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
> Reviewed-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Janne Grunau <j@...nau.net>

Tested this on Asahi Fedora Remix kernel-edge on Mac Mini M1.

Tested-by: Eric Curtin <ecurtin@...hat.com>

Is mise le meas/Regards,

Eric Curtin

> ---
> Changes in v3:
> - dropped Cc: stable
> - rewritten commit message since the warning is fixed by 6fffbc7ae137 ("PCI: Honor firmware's
> device disabled status")
> - Link to v2: https://lore.kernel.org/r/20230307-apple_pcie_disabled_ports-v2-1-c3bd1fd278a4@jannau.net
>
> Changes in v2:
> - rewritten commit message with more details and corrections
> - collected Marc's "Reviewed-by:"
> - Link to v1: https://lore.kernel.org/r/20230307-apple_pcie_disabled_ports-v1-1-b32ef91faf19@jannau.net
> ---
>  drivers/pci/controller/pcie-apple.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index 66f37e403a09..f8670a032f7a 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -783,7 +783,7 @@ static int apple_pcie_init(struct pci_config_window *cfg)
>         cfg->priv = pcie;
>         INIT_LIST_HEAD(&pcie->ports);
>
> -       for_each_child_of_node(dev->of_node, of_port) {
> +       for_each_available_child_of_node(dev->of_node, of_port) {
>                 ret = apple_pcie_setup_port(pcie, of_port);
>                 if (ret) {
>                         dev_err(pcie->dev, "Port %pOF setup fail: %d\n", of_port, ret);
>
> ---
> base-commit: c9c3395d5e3dcc6daee66c6908354d47bf98cb0c
> change-id: 20230307-apple_pcie_disabled_ports-0c17fb7a4738
>
> Best regards,
> --
> Janne Grunau <j@...nau.net>
>
>