x86: SB600: skip ACPI IRQ0 override if it is not routed to INT2 of IOAPIC

commit 26adcfbf00e0726b4469070aa2f530dcf963f484 upstream.

On some more HP laptops BIOS reports an IRQ0 override
but the SB600 chipset is configured such that timer
interrupts go to INT0 of IOAPIC.

Check IRQ0 routing and if it is routed to INT0 of IOAPIC skip the
timer override.

http://bugzilla.kernel.org/show_bug.cgi?id=11715
http://bugzilla.kernel.org/show_bug.cgi?id=11516

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 6b839b1476441c602f32ca62ad1a87a3bc801e87..1b894b72c0f5df35a1d489def584086ebb2affe5 100644 (file)
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -95,7 +95,8 @@ static void __init nvidia_bugs(int num, int slot, int func)
 
 }
 
-static u32 ati_ixp4x0_rev(int num, int slot, int func)
+#if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
+static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
 {
        u32 d;
        u8  b;
@@ -115,7 +116,6 @@ static u32 ati_ixp4x0_rev(int num, int slot, int func)
 
 static void __init ati_bugs(int num, int slot, int func)
 {
-#if defined(CONFIG_ACPI) && defined (CONFIG_X86_IO_APIC)
        u32 d;
        u8  b;
 
@@ -138,9 +138,56 @@ static void __init ati_bugs(int num, int slot, int func)
                printk(KERN_INFO "If you got timer trouble "
                       "try acpi_use_timer_override\n");
        }
-#endif
 }
 
+static u32 __init ati_sbx00_rev(int num, int slot, int func)
+{
+       u32 old, d;
+
+       d = read_pci_config(num, slot, func, 0x70);
+       old = d;
+       d &= ~(1<<8);
+       write_pci_config(num, slot, func, 0x70, d);
+       d = read_pci_config(num, slot, func, 0x8);
+       d &= 0xff;
+       write_pci_config(num, slot, func, 0x70, old);
+
+       return d;
+}
+
+static void __init ati_bugs_contd(int num, int slot, int func)
+{
+       u32 d, rev;
+
+       if (acpi_use_timer_override)
+               return;
+
+       rev = ati_sbx00_rev(num, slot, func);
+       if (rev > 0x13)
+               return;
+
+       /* check for IRQ0 interrupt swap */
+       d = read_pci_config(num, slot, func, 0x64);
+       if (!(d & (1<<14)))
+               acpi_skip_timer_override = 1;
+
+       if (acpi_skip_timer_override) {
+               printk(KERN_INFO "SB600 revision 0x%x\n", rev);
+               printk(KERN_INFO "Ignoring ACPI timer override.\n");
+               printk(KERN_INFO "If you got timer trouble "
+                      "try acpi_use_timer_override\n");
+       }
+}
+#else
+static void __init ati_bugs(int num, int slot, int func)
+{
+}
+
+static void __init ati_bugs_contd(int num, int slot, int func)
+{
+}
+#endif
+
 #define QFLAG_APPLY_ONCE       0x1
 #define QFLAG_APPLIED          0x2
 #define QFLAG_DONE             (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@@ -162,6 +209,8 @@ static struct chipset early_qrk[] __initdata = {
          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 },
+       { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
+         PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
        {}
 };