From: Fabio Estevam fabio.estevam@nxp.com
Since commit ff3e077bd2 ("dm: pci: Add a uclass for PCI") the following error message is seen:
=> pci 0 Scanning PCI devices on bus 0 BusDevFun VendorId DeviceId Device Class Sub-Class _____________________________________________________________ 00.01.00 0x16c3 0xabcd Bridge device 0x04 Cannot read bus configuration: -1
We can avoid this error by using the same approach as done in the linux kernel PCI designware driver: (drivers/pci/host/pcie-designware.c)
static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 *val) { struct pcie_port *pp = bus->sysdata; int ret;
if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) { *val = 0xffffffff; return PCIBIOS_DEVICE_NOT_FOUND; }
,where PCIBIOS_DEVICE_NOT_FOUND is returned when an invalid address is given.
Reported-by: Bin Meng bmeng.cn@gmail.com Signed-off-by: Fabio Estevam fabio.estevam@nxp.com --- drivers/pci/pcie_layerscape.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c index 58e88ae..af0fd71 100644 --- a/drivers/pci/pcie_layerscape.c +++ b/drivers/pci/pcie_layerscape.c @@ -314,7 +314,7 @@ static int ls_pcie_read_config(struct pci_controller *hose, pci_dev_t d,
if (ls_pcie_addr_valid(hose, d)) { *val = 0xffffffff; - return -EINVAL; + return PCIBIOS_DEVICE_NOT_FOUND; }
if (PCI_BUS(d) == hose->first_busno) {