diff options
Diffstat (limited to 'arch/mips/loongson/common')
| -rw-r--r-- | arch/mips/loongson/common/cs5536/cs5536_isa.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/mips/loongson/common/cs5536/cs5536_isa.c b/arch/mips/loongson/common/cs5536/cs5536_isa.c index a6eb2e853d94..924be39e7733 100644 --- a/arch/mips/loongson/common/cs5536/cs5536_isa.c +++ b/arch/mips/loongson/common/cs5536/cs5536_isa.c @@ -13,6 +13,7 @@ * option) any later version. */ +#include <linux/pci.h> #include <cs5536/cs5536.h> #include <cs5536/cs5536_pci.h> @@ -314,3 +315,16 @@ u32 pci_isa_read_reg(int reg) return conf_data; } + +/* + * The mfgpt timer interrupt is running early, so we must keep the south bridge + * mmio always enabled. Otherwise we may race with the PCI configuration which + * may temporarily disable it. When that happens and the timer interrupt fires, + * we are not able to clear it and the system will hang. + */ +static void cs5536_isa_mmio_always_on(struct pci_dev *dev) +{ + dev->mmio_always_on = 1; +} +DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, + PCI_CLASS_BRIDGE_ISA, 8, cs5536_isa_mmio_always_on); |