diff options
| -rw-r--r-- | drivers/pci/pci-aardvark.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/pci/pci-aardvark.c b/drivers/pci/pci-aardvark.c index 815b26162f1..d3ef8f203d9 100644 --- a/drivers/pci/pci-aardvark.c +++ b/drivers/pci/pci-aardvark.c @@ -358,7 +358,18 @@ static int pcie_advk_read_config(const struct udevice *bus, pci_dev_t bdf, return 0; } - allow_crs = (offset == PCI_VENDOR_ID) && (size == 4); + /* + * Returning fabricated CRS value (0xFFFF0001) by PCIe Root Complex to + * OS is allowed only for 4-byte PCI_VENDOR_ID config read request and + * only when CRSSVE bit in Root Port PCIe device is enabled. In all + * other error PCIe Root Complex must return all-ones. + * Aardvark HW does not have Root Port PCIe device and U-Boot does not + * implement emulation of this device. + * U-Boot currently does not support handling of CRS return value for + * PCI_VENDOR_ID config read request and also does not set CRSSVE bit. + * Therefore disable returning CRS response for now. + */ + allow_crs = false; if (advk_readl(pcie, PIO_START)) { dev_err(pcie->dev, |