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Merge branch 'remotes/lorenzo/pci/imx'

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- Reduce i.MX 6Quad DBI register length to avoid aborts from accessing
    invalid registers (Stefan Agner)

* remotes/lorenzo/pci/imx:
  PCI: imx6: Limit DBI register length
This commit is contained in:
Bjorn Helgaas 2019-09-23 16:10:21 -05:00
commit 7088241678
1 changed files with 33 additions and 0 deletions
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33
drivers/pci/controller/dwc/pci-imx6.c
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@ -57,6 +57,7 @@ enum imx6_pcie_variants {
struct imx6_pcie_drvdata {
enum imx6_pcie_variants variant;
u32 flags;
int dbi_length;
};
struct imx6_pcie {
@ -1212,6 +1213,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.variant = IMX6Q,
.flags = IMX6_PCIE_FLAG_IMX6_PHY |
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
.dbi_length = 0x200,
},
[IMX6SX] = {
.variant = IMX6SX,
@ -1254,6 +1256,37 @@ static struct platform_driver imx6_pcie_driver = {
.shutdown = imx6_pcie_shutdown,
};
static void imx6_pcie_quirk(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;
struct pcie_port *pp = bus->sysdata;
/* Bus parent is the PCI bridge, its parent is this platform driver */
if (!bus->dev.parent || !bus->dev.parent->parent)
return;
/* Make sure we only quirk devices associated with this driver */
if (bus->dev.parent->parent->driver != &imx6_pcie_driver.driver)
return;
if (bus->number == pp->root_bus_nr) {
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
/*
* Limit config length to avoid the kernel reading beyond
* the register set and causing an abort on i.MX 6Quad
*/
if (imx6_pcie->drvdata->dbi_length) {
dev->cfg_size = imx6_pcie->drvdata->dbi_length;
dev_info(&dev->dev, "Limiting cfg_size to %d\n",
dev->cfg_size);
}
}
}
DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, 0xabcd,
PCI_CLASS_BRIDGE_PCI, 8, imx6_pcie_quirk);
static int __init imx6_pcie_init(void)
{
#ifdef CONFIG_ARM