1 files changed, 48 insertions, 0 deletions

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 4353cf5e6fac..6b839b147644 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -95,6 +95,52 @@ static void __init nvidia_bugs(int num, int slot, int func)
 
 }
 
+static u32 ati_ixp4x0_rev(int num, int slot, int func)
+{
+        u32 d;
+        u8  b;
+
+        b = read_pci_config_byte(num, slot, func, 0xac);
+        b &= ~(1<<5);
+        write_pci_config_byte(num, slot, func, 0xac, b);
+
+        d = read_pci_config(num, slot, func, 0x70);
+        d |= 1<<8;
+        write_pci_config(num, slot, func, 0x70, d);
+
+        d = read_pci_config(num, slot, func, 0x8);
+        d &= 0xff;
+        return d;
+}
+
+static void __init ati_bugs(int num, int slot, int func)
+{
+#if defined(CONFIG_ACPI) && defined (CONFIG_X86_IO_APIC)
+        u32 d;
+        u8  b;
+
+        if (acpi_use_timer_override)
+                return;
+
+        d = ati_ixp4x0_rev(num, slot, func);
+        if (d  < 0x82)
+                acpi_skip_timer_override = 1;
+        else {
+                /* check for IRQ0 interrupt swap */
+                outb(0x72, 0xcd6); b = inb(0xcd7);
+                if (!(b & 0x2))
+                        acpi_skip_timer_override = 1;
+        }
+
+        if (acpi_skip_timer_override) {
+                printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
+                printk(KERN_INFO "Ignoring ACPI timer override.\n");
+                printk(KERN_INFO "If you got timer trouble "
+                       "try acpi_use_timer_override\n");
+        }
+#endif
+}
+
 #define QFLAG_APPLY_ONCE        0x1
 #define QFLAG_APPLIED           0x2
 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@@ -114,6 +160,8 @@ static struct chipset early_qrk[] __initdata = {
           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
+        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
+          PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
         {}
 };