ARM: Kirkwood: Update PCI-E fixup

commit 1dc831bf53fddcc6443f74a39e72db5bcea4f15d upstream.

- The code relies on rc_pci_fixup being called, which only happens
  when CONFIG_PCI_QUIRKS is enabled, so add that to Kconfig. Omitting
  this causes a booting failure with a non-obvious cause.
- Update rc_pci_fixup to set the class properly, copying the
  more modern style from other places
- Correct the rc_pci_fixup comment

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 48c19d44be9a4a9ef4db74ffadd6f0132c459546..589bdba1617b2f98d76874a95053fa30b20c7e73 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -585,6 +585,7 @@ config ARCH_KIRKWOOD
        bool "Marvell Kirkwood"
        select CPU_FEROCEON
        select PCI
+       select PCI_QUIRKS
        select ARCH_REQUIRE_GPIOLIB
        select GENERIC_CLOCKEVENTS
        select NEED_MACH_IO_H

diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c
index 6e8b2efa3c353ae830639b5a25a526b305dd922e..f3f55b2bb3022a803462e27dc539fc06718902eb 100644 (file)
--- a/arch/arm/mach-kirkwood/pcie.c
+++ b/arch/arm/mach-kirkwood/pcie.c
@@ -225,14 +225,19 @@ static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
        return 1;
 }
 
+/*
+ * The root complex has a hardwired class of PCI_CLASS_MEMORY_OTHER, when it
+ * is operating as a root complex this needs to be switched to
+ * PCI_CLASS_BRIDGE_HOST or Linux will errantly try to process the BAR's on
+ * the device. Decoding setup is handled by the orion code.
+ */
 static void __devinit rc_pci_fixup(struct pci_dev *dev)
 {
-       /*
-        * Prevent enumeration of root complex.
-        */
        if (dev->bus->parent == NULL && dev->devfn == 0) {
                int i;
 
+               dev->class &= 0xff;
+               dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
                for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                        dev->resource[i].start = 0;
                        dev->resource[i].end   = 0;