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pci: brcmstb: Fix PCIe bus numbers

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The linux kernel assigns a new domain for every Root Complex where bus
numbering starts from 0 for each domain. U-Boot does not have domains
and uses a flattened bus numbering scheme instead. This means that any
device or bridge on the second enumerated RC will receive a bus number
equal to the last assigned one +1. This bus number contributes to the
address written into the index register, which will select the
configuration space to be read. Compensate for this contribution by
subtracting the base bus number.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Signed-off-by: Torsten Duwe <duwe@suse.de>
Tested-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
This commit is contained in:
Andrea della Porta
2026-06-01 12:39:23 +02:00
committed by Peter Robinson
parent b20ce94bb9
commit b24c620e5e
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/pcie_brcmstb.c
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@@ -125,7 +125,7 @@ static int brcm_pcie_config_address(const struct udevice *dev, pci_dev_t bdf,
uint offset, void **paddress)
{
struct brcm_pcie *pcie = dev_get_priv(dev);
unsigned int pci_bus = PCI_BUS(bdf);
unsigned int pci_bus = PCI_BUS(bdf) - dev_seq(dev);
unsigned int pci_dev = PCI_DEV(bdf);
unsigned int pci_func = PCI_FUNC(bdf);
int idx;