diff mbox series

[RFC,v4,20/20] ACPI: pci_link: Clear the dependencies after probe

Message ID 20240415170113.662318-21-sunilvl@ventanamicro.com
State Superseded
Headers show
Series RISC-V: ACPI: Add external interrupt controller support | expand

Commit Message

Sunil V L April 15, 2024, 5:01 p.m. UTC 
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 added between Link device and PCI Host Bridge,
then the PCI end points can get probed prior to link device unable to
get mapping for INTx.

So, add the link device's HID to dependency honor list and also clear it
after its probe.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 drivers/acpi/pci_link.c | 3 +++
 drivers/acpi/scan.c     | 1 +
 2 files changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index aa1038b8aec4..48cdcedafad6 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -748,6 +748,9 @@  static int acpi_pci_link_add(struct acpi_device *device,
 	if (result)
 		kfree(link);
 
+	if (IS_ENABLED(CONFIG_ARCH_ACPI_DEFERRED_GSI))
+		acpi_dev_clear_dependencies(device);
+
 	return result < 0 ? result : 1;
 }
 
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 086ae040a5ad..32865af071ce 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -835,6 +835,7 @@  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
 };