diff options
| -rw-r--r-- | drivers/pci/pcie_imx.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pci/pcie_imx.c b/drivers/pci/pcie_imx.c index 90a34063b0..ef66a1d3f4 100644 --- a/drivers/pci/pcie_imx.c +++ b/drivers/pci/pcie_imx.c @@ -616,6 +616,17 @@ static int imx_pcie_link_up(void) imx_pcie_regions_setup(); /* + * By default, the subordinate is set equally to the secondary + * bus (0x01) when the RC boots. + * This means that theoretically, only bus 1 is reachable from the RC. + * Force the PCIe RC subordinate to 0xff, otherwise no downstream + * devices will be detected if the enumeration is applied strictly. + */ + tmp = readl(MX6_DBI_ADDR + 0x18); + tmp |= (0xff << 16); + writel(tmp, MX6_DBI_ADDR + 0x18); + + /* * FIXME: Force the PCIe RC to Gen1 operation * The RC must be forced into Gen1 mode before bringing the link * up, otherwise no downstream devices are detected. After the |