pci: mediatek: add support for multiple ports in mediatek pcie gen3 driver
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_.
diff --git a/drivers/pci/pcie_mediatek_gen3.c b/drivers/pci/pcie_mediatek_gen3.c
index 0149eda..1818d4c 100644
--- a/drivers/pci/pcie_mediatek_gen3.c
+++ b/drivers/pci/pcie_mediatek_gen3.c
@@ -83,6 +83,28 @@
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 @@
int bytes;
u32 val;
+ devfn = convert_bdf(bus, devfn);
+
size = 1 << size;
bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3);