Define the length of the DBI registers. This makes sure that
the kernel does not access registers beyond that point, avoiding
the following abort on a i.MX 6Quad:
# cat /sys/devices/soc0/soc/1ffc000.pcie/pci0000\:00/0000\:00\:00.0/config
[ 100.021433] Unhandled fault: imprecise external abort (0x1406) at 0xb6ea7000
...
[ 100.056423] PC is at dw_pcie_read+0x50/0x84
[ 100.060790] LR is at dw_pcie_rd_own_conf+0x44/0x48
...
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
Changes in v3:
- Rebase on pci/dwc
Changes in v4:
- Rebase on pci/dwc
drivers/pci/controller/dwc/pci-imx6.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 45cbdf2ccf80..a69eb625ed18 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -43,6 +43,7 @@ enum imx6_pcie_variants {
struct imx6_pcie_drvdata {
enum imx6_pcie_variants variant;
+ int dbi_length;
};
struct imx6_pcie {
@@ -1015,6 +1016,8 @@ static int imx6_pcie_probe(struct platform_device *pdev)
break;
}
+ pci->dbi_length = imx6_pcie->drvdata->dbi_length;
+
/* Grab turnoff reset */
imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
if (IS_ERR(imx6_pcie->turnoff_reset)) {
@@ -1086,7 +1089,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
}
static const struct imx6_pcie_drvdata drvdata[] = {
- [IMX6Q] = { .variant = IMX6Q },
+ [IMX6Q] = { .variant = IMX6Q, .dbi_length = 0x15c },
[IMX6SX] = { .variant = IMX6SX },
[IMX6QP] = { .variant = IMX6QP },
[IMX7D] = { .variant = IMX7D },
--
2.19.1
