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

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Date:   Thu, 23 Mar 2023 09:10:12 +0100
From:   Janne Grunau <j@...nau.net>
To:     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>
Cc:     Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        asahi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Janne Grunau <j@...nau.net>
Subject: [PATCH v3] PCI: apple: Set only available ports up

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>
---
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>