One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0 on this port represents the controller itself and bus 1 represents the external PCIe device.
If multiple PCIe controllers are probed in U-Boot, U-Boot will use bus numbers greater than 2 as input parameters. Therefore, we should convert the BDF bus number to either 0 or 1 by subtracting the offset by controller->seq_. Signed-off-by: Sam Shih <[email protected]> Signed-off-by: Weijie Gao <[email protected]> --- drivers/pci/pcie_mediatek_gen3.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/pci/pcie_mediatek_gen3.c b/drivers/pci/pcie_mediatek_gen3.c index 0149edae0bf..1818d4c1e30 100644 --- a/drivers/pci/pcie_mediatek_gen3.c +++ b/drivers/pci/pcie_mediatek_gen3.c @@ -83,6 +83,28 @@ struct mtk_pcie { struct phy phy; }; +static pci_dev_t convert_bdf(const struct udevice *controller, pci_dev_t bdf) +{ + int bdfs[3]; + + bdfs[0] = PCI_BUS(bdf); + bdfs[1] = PCI_DEV(bdf); + bdfs[2] = PCI_FUNC(bdf); + + /* + * One MediaTek PCIe Gen3 controller has only one port, where PCI bus 0 on + * this port represents the controller itself and bus 1 represents the + * external PCIe device. If multiple PCIe controllers are probed in U-Boot, + * U-Boot will use bus numbers greater than 2 as input parameters. Therefore, + * we should convert the BDF bus number to either 0 or 1 by subtracting the + * offset by controller->seq_ + */ + + bdfs[0] = bdfs[0] - controller->seq_; + + return PCI_BDF(bdfs[0], bdfs[1], bdfs[2]); +} + static void mtk_pcie_config_tlp_header(const struct udevice *bus, pci_dev_t devfn, int where, int size) @@ -91,6 +113,8 @@ static void mtk_pcie_config_tlp_header(const struct udevice *bus, int bytes; u32 val; + devfn = convert_bdf(bus, devfn); + size = 1 << size; bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3); -- 2.34.1
