The PFTF CM4 is an ACPI platform that is following the PCIe SMCCC standard because its PCIe config space isn't ECAM compliant and is split into two parts. One part for the root port registers and a moveable window which points at a given device's 4K config space. Thus it doesn't have a MCFG (and really any MCFG provided would be nonsense anyway). As linux doesn't support the PCIe SMCCC standard we key off a linux specific host bridge _DSD to add custom ECAM ops and cfgres. The cfg op selects between those two regions, as well as disallowing problematic accesses, particularly if the link is down because there isn't an attached device. Jeremy Linton (3): PCI: brcmstb: Break register definitions into separate header PCI: brcmstb: Add ACPI config space quirk PCI/ACPI: Add new quirk detection, enable bcm2711 drivers/acpi/pci_mcfg.c | 14 ++ drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pcie-brcmstb-acpi.c | 77 +++++++++ drivers/pci/controller/pcie-brcmstb.c | 179 +------------------- drivers/pci/controller/pcie-brcmstb.h | 182 +++++++++++++++++++++ include/linux/pci-ecam.h | 1 + 6 files changed, 276 insertions(+), 178 deletions(-) create mode 100644 drivers/pci/controller/pcie-brcmstb-acpi.c create mode 100644 drivers/pci/controller/pcie-brcmstb.h -- 2.31.1
