[PATCH v7 06/17] ACPI: scan: Define weak function to populate dependencies
From: Sunil V L <sunilvl@ventanamicro.com>
Date: 2024-07-29 14:23:30
Also in:
linux-pci, linux-riscv, lkml
Subsystem:
acpi, acpi component architecture (acpica), the rest · Maintainers:
"Rafael J. Wysocki", Saket Dumbre, Linus Torvalds
Some architectures like RISC-V need to add dependencies without explicit _DEP. Define a weak function which can be implemented by the architecture. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> --- drivers/acpi/scan.c | 11 +++++++++++ include/acpi/acpi_bus.h | 1 + 2 files changed, 12 insertions(+)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 39b3ccae9f79..28a221f956d7 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c@@ -2077,11 +2077,22 @@ static void acpi_scan_init_hotplug(struct acpi_device *adev) } } +u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; } + static u32 acpi_scan_check_dep(acpi_handle handle) { struct acpi_handle_list dep_devices; u32 count = 0; + /* + * Some architectures like RISC-V need to add dependencies for + * all devices which use GSI to the interrupt controller so that + * interrupt controller is probed before any of those devices. + * Instead of mandating _DEP on all the devices, detect the + * dependency and add automatically. + */ + count += arch_acpi_add_auto_dep(handle); + /* * Check for _HID here to avoid deferring the enumeration of: * 1. PCI devices.
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index d6a4dd58e36f..af72a5d9de99 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h@@ -994,6 +994,7 @@ static inline void acpi_put_acpi_dev(struct acpi_device *adev) int acpi_wait_for_acpi_ipmi(void); int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices); +u32 arch_acpi_add_auto_dep(acpi_handle handle); #else /* CONFIG_ACPI */ static inline int register_acpi_bus_type(void *bus) { return 0; }
--
2.43.0