Commit 2cb9155d authored by Sunil V L's avatar Sunil V L Committed by Rafael J. Wysocki
Browse files

ACPI: pci_link: Clear the dependencies after probe 



RISC-V platforms need to use dependencies between PCI host bridge, Link
devices and the interrupt controllers to ensure probe order. The
dependency is like below.

Interrupt controller <-- Link Device <-- PCI Host bridge.

If there is no dependency between Link device and PCI Host Bridge,
then PCI devices may be probed prior to Link devices.  If a PCI
device is probed before its Link device, we won't be able to find
its INTx mapping.

So, add the link device's HID to dependency honor list and clear the
dependency after probe is done so that the dependent devices are
unblocked to probe.

Signed-off-by: default avatarSunil V L <sunilvl@ventanamicro.com>
Tested-by: default avatarBjörn Töpel <bjorn@rivosinc.com>
Link: https://patch.msgid.link/20240812005929.113499-9-sunilvl@ventanamicro.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 21734d29

drivers/acpi/pci_link.c

+2 −0
Original line number Diff line number Diff line
@@ -748,6 +748,8 @@ static int acpi_pci_link_add(struct acpi_device *device, 
	if (result)

		kfree(link);



	acpi_dev_clear_dependencies(device);



	return result < 0 ? result : 1;

}

drivers/acpi/scan.c

+1 −0
Original line number Diff line number Diff line
@@ -863,6 +863,7 @@ static const char * const acpi_honor_dep_ids[] = { 
	"INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */

	"RSCV0001", /* RISC-V PLIC */

	"RSCV0002", /* RISC-V APLIC */

	"PNP0C0F",  /* PCI Link Device */

	NULL

};