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-rw-r--r--drivers/pci/pcie_imx.c11
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