diff options
| author | Chen Pei <cp0613@linux.alibaba.com> | 2026-05-26 10:51:18 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-06-01 19:25:37 +0200 |
| commit | bf5418a5fe63f35da35941ae896d5df121d95ffc (patch) | |
| tree | 35eb554b342b928d7250fdb4e5e402faa7afa735 | |
| parent | 3a59c3b772e5dc0cedecce8e7fbf7c2d6245b643 (diff) | |
ACPI: scan: Honor _DEP for ACPI0016 PCI/CXL host bridge
CXL root devices (ACPI0017) declare _DEP on their parent ACPI0016
PCI/CXL host bridge so that cxl_acpi probes only after acpi_pci_root
has attached the PCI root and registered it for acpi_pci_find_root().
However, acpi_dev_ready_for_enumeration() only consults dep_unmet
when the supplier's HID is on acpi_honor_dep_ids[]; otherwise the
dependency is silently ignored.
Without honoring the dependency, cxl_acpi can probe before the PCI
root is ready. The resulting CXL topology is broken: decoder targets
read as 0 and no port/endpoint devices appear under
/sys/bus/cxl/devices/.
Add ACPI0016 to acpi_honor_dep_ids[] so the _DEP declared by ACPI0017
is enforced. This relies on the preceding patch ("ACPI: PCI: clear
_DEP dependencies after PCI root bridge attach"), which releases the
dependency once the PCI root is fully enumerated; the two patches
must be applied together.
Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
Tested-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260526025118.38935-3-cp0613@linux.alibaba.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/scan.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 530547cda8b2..5f20e7748f36 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -866,6 +866,7 @@ static const char * const acpi_honor_dep_ids[] = { "RSCV0005", /* RISC-V SBI MPXY MBOX */ "RSCV0006", /* RISC-V RPMI SYSMSI */ "PNP0C0F", /* PCI Link Device */ + "ACPI0016", /* CXL/PCIe host bridge: CXL root (ACPI0017) depends on PCI root attach */ NULL }; |