pcie_bwctrl fails to probe on Rpi 4 (linux-next-20241101)

[Stefan Wahren]

Hi,
I tested linux-next-20241101 with the Raspberry Pi 4 (8 GB RAM,
arm64/defconfig) and during boot the driver pcie_bwctrl fails to probe.
Since this driver is very new, I assume this never worked before:

[    6.843802] brcm-pcie fd500000.pcie: host bridge /scb/pcie at 7d500000
ranges:
[    6.843851] brcm-pcie fd500000.pcie:   No bus range found for
/scb/pcie at 7d500000, using [bus 00-ff]
[    6.843900] brcm-pcie fd500000.pcie:      MEM
0x0600000000..0x0603ffffff -> 0x00f8000000
[    6.843940] brcm-pcie fd500000.pcie:   IB MEM
0x0000000000..0x00bfffffff -> 0x0400000000
[    6.859915] vchiq: module is from the staging directory, the quality
is unknown, you have been warned.
[    6.885670] brcm-pcie fd500000.pcie: PCI host bridge to bus 0000:00
[    6.885704] pci_bus 0000:00: root bus resource [bus 00-ff]
[    6.885725] pci_bus 0000:00: root bus resource [mem
0x600000000-0x603ffffff] (bus address [0xf8000000-0xfbffffff])
[    6.885823] pci 0000:00:00.0: [14e4:2711] type 01 class 0x060400 PCIe
Root Port
[    6.885858] pci 0000:00:00.0: PCI bridge to [bus 01]
[    6.885876] pci 0000:00:00.0:   bridge window [mem
0x600000000-0x6000fffff]
[    6.885954] pci 0000:00:00.0: PME# supported from D0 D3hot
[    6.909911] pci_bus 0000:01: supply vpcie3v3 not found, using dummy
regulator
[    6.910159] pci_bus 0000:01: supply vpcie3v3aux not found, using
dummy regulator
[    6.910251] pci_bus 0000:01: supply vpcie12v not found, using dummy
regulator
[    6.922254] mmc1: new high speed SDIO card at address 0001
[    7.013175] brcm-pcie fd500000.pcie: clkreq-mode set to default
[    7.015309] brcm-pcie fd500000.pcie: link up, 5.0 GT/s PCIe x1 (SSC)
[    7.015526] pci 0000:01:00.0: [1106:3483] type 00 class 0x0c0330 PCIe
Endpoint
[    7.015626] pci 0000:01:00.0: BAR 0 [mem 0x00000000-0x00000fff 64bit]
[    7.015954] pci 0000:01:00.0: PME# supported from D0 D3hot
[    7.062153] pci 0000:00:00.0: bridge window [mem
0x600000000-0x6000fffff]: assigned
[    7.062191] pci 0000:01:00.0: BAR 0 [mem 0x600000000-0x600000fff
64bit]: assigned
[    7.062221] pci 0000:00:00.0: PCI bridge to [bus 01]
[    7.062237] pci 0000:00:00.0:   bridge window [mem
0x600000000-0x6000fffff]
[    7.062255] pci_bus 0000:00: resource 4 [mem 0x600000000-0x603ffffff]
[    7.062269] pci_bus 0000:01: resource 1 [mem 0x600000000-0x6000fffff]
[    7.062590] pcieport 0000:00:00.0: enabling device (0000 -> 0002)
[    7.062812] pcieport 0000:00:00.0: PME: Signaling with IRQ 39
[    7.072890] pcieport 0000:00:00.0: AER: enabled with IRQ 39
[    7.091767] v3d fec00000.gpu: [drm] Using Transparent Hugepages
[    7.124274] genirq: Flags mismatch irq 39. 00002084 (PCIe bwctrl) vs.
00200084 (PCIe PME)
[    7.124391] pcie_bwctrl 0000:00:00.0:pcie010: probe with driver
pcie_bwctrl failed with error -16