[RFC PATCH v2 04/21] ACPI: irq: Add support for deferred probe in acpi_register_gsi()
From: Sunil V L <sunilvl@ventanamicro.com>
Date: 2023-10-25 20:24:47
Also in:
linux-acpi, linux-pci, linux-riscv, linux-serial, lkml
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
The chip which provides the GSI support may not be initialized at the time of acpi_register_gsi(). Return -EPROBE_DEFER to support deferred probing similar to acpi_irq_get(). Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> --- drivers/acpi/irq.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
index 1687483ff319..c06cfc9725cb 100644
--- a/drivers/acpi/irq.c
+++ b/drivers/acpi/irq.c@@ -51,19 +51,23 @@ EXPORT_SYMBOL_GPL(acpi_gsi_to_irq); * @polarity: polarity of the GSI to be mapped * * Returns: a valid linux IRQ number on success + * -EPROBE_DEFER if irqdomain is not available. * -EINVAL on failure */ int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity) { + struct irq_domain *domain; struct irq_fwspec fwspec; unsigned int irq; fwspec.fwnode = acpi_get_gsi_domain_id(gsi); - if (WARN_ON(!fwspec.fwnode)) { - pr_warn("GSI: No registered irqchip, giving up\n"); - return -EINVAL; - } + if (!fwspec.fwnode) + return -EPROBE_DEFER; + + domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY); + if (!domain) + return -EPROBE_DEFER; fwspec.param[0] = gsi; fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
--
2.39.2
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