From cf3287fb2c1ff74cb16e4348c6914acf140ebe30 Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam Date: Mon, 23 Feb 2026 20:15:59 +0530 Subject: PCI/pwrctrl: Ensure that remote endpoint node parent has supply requirement If OF graph is used in the PCI device node, the pwrctrl core creates a pwrctrl device even if the remote endpoint doesn't have power supply requirements. Since the device doesn't have any power supply requirements, there was no pwrctrl driver to probe, leading to PCI controller driver probe deferral as it waits for all pwrctrl drivers to probe before starting bus scan. This issue happens with Qcom ath12k devices with WSI interface attached to the Qcom IPQ platforms. Fix this issue by checking for the existence of at least one power supply property in the remote endpoint parent node. To consolidate all the checks, create a new helper pci_pwrctrl_is_required() and move all the checks there. Fixes: 9db826206f9b ("PCI/pwrctrl: Create pwrctrl device if graph port is found") Reported-by: Raj Kumar Bhagat Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Tested-by: Raj Kumar Bhagat Reviewed-by: Krishna Chaitanya Chundru Reviewed-by: Bartosz Golaszewski Link: https://patch.msgid.link/20260223-pwrctrl-fixes-7-0-v2-1-97566dfb1809@oss.qualcomm.com --- drivers/pci/pwrctrl/core.c | 47 +++++++++++++++++++++++++++++++++------------- 1 file changed, 34 insertions(+), 13 deletions(-) diff --git a/drivers/pci/pwrctrl/core.c b/drivers/pci/pwrctrl/core.c index 6f7dea6746e0..8325858cc379 100644 --- a/drivers/pci/pwrctrl/core.c +++ b/drivers/pci/pwrctrl/core.c @@ -268,6 +268,39 @@ err_power_off: } EXPORT_SYMBOL_GPL(pci_pwrctrl_power_on_devices); +/* + * Check whether the pwrctrl device really needs to be created or not. The + * pwrctrl device will only be created if the node satisfies below requirements: + * + * 1. Presence of compatible property to match against the pwrctrl driver (AND) + * 2. At least one of the power supplies defined in the devicetree node of the + * device (OR) in the remote endpoint parent node to indicate pwrctrl + * requirement. + */ +static bool pci_pwrctrl_is_required(struct device_node *np) +{ + struct device_node *endpoint; + + if (!of_property_present(np, "compatible")) + return false; + + if (of_pci_supply_present(np)) + return true; + + if (of_graph_is_present(np)) { + for_each_endpoint_of_node(np, endpoint) { + struct device_node *remote __free(device_node) = + of_graph_get_remote_port_parent(endpoint); + if (remote) { + if (of_pci_supply_present(remote)) + return true; + } + } + } + + return false; +} + static int pci_pwrctrl_create_device(struct device_node *np, struct device *parent) { @@ -287,19 +320,7 @@ static int pci_pwrctrl_create_device(struct device_node *np, return 0; } - /* - * Sanity check to make sure that the node has the compatible property - * to allow driver binding. - */ - if (!of_property_present(np, "compatible")) - return 0; - - /* - * Check whether the pwrctrl device really needs to be created or not. - * This is decided based on at least one of the power supplies defined - * in the devicetree node of the device or the graph property. - */ - if (!of_pci_supply_present(np) && !of_graph_is_present(np)) { + if (!pci_pwrctrl_is_required(np)) { dev_dbg(parent, "Skipping OF node: %s\n", np->name); return 0; } -- cgit v1.2.3