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| author | Andy Currid <ACurrid@nvidia.com> | 2006-06-08 00:43:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-08 15:12:21 -0700 |
| commit | d44647b0a6e48d18a1402dfa9052d85c4fe98341 (patch) | |
| tree | b71d11af7eac501ba37d7ea45caecf5eb0a3cfe9 /arch/i386/kernel/acpi/earlyquirk.c | |
| parent | 1def630a6a49dda5bc89dfbd86656293640456f0 (diff) | |
| download | blackbird-op-linux-d44647b0a6e48d18a1402dfa9052d85c4fe98341.tar.gz blackbird-op-linux-d44647b0a6e48d18a1402dfa9052d85c4fe98341.zip | |
[PATCH] Fix HPET operation on 32-bit NVIDIA platforms
From: "Andy Currid" <ACurrid@nvidia.com>
This patch fixes a kernel panic during boot that occurs on NVIDIA platforms
that have HPET enabled.
When HPET is enabled, the standard timer IRQ is routed to IOAPIC pin 2 and is
advertised as such in the ACPI APIC table - but an earlier workaround in the
kernel was ignoring this override. The fix is to honor timer IRQ overrides
from ACPI when HPET is detected on an NVIDIA platform.
Signed-off-by: Andy Currid <acurrid@nvidia.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: "Yu, Luming" <luming.yu@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/acpi/earlyquirk.c')
| -rw-r--r-- | arch/i386/kernel/acpi/earlyquirk.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c index 2e3b643a4dc4..1649a175a206 100644 --- a/arch/i386/kernel/acpi/earlyquirk.c +++ b/arch/i386/kernel/acpi/earlyquirk.c @@ -5,17 +5,34 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/pci.h> +#include <linux/acpi.h> + #include <asm/pci-direct.h> #include <asm/acpi.h> #include <asm/apic.h> +#ifdef CONFIG_ACPI + +static int nvidia_hpet_detected __initdata; + +static int __init nvidia_hpet_check(unsigned long phys, unsigned long size) +{ + nvidia_hpet_detected = 1; + return 0; +} +#endif + static int __init check_bridge(int vendor, int device) { #ifdef CONFIG_ACPI - /* According to Nvidia all timer overrides are bogus. Just ignore - them all. */ + /* According to Nvidia all timer overrides are bogus unless HPET + is enabled. */ if (vendor == PCI_VENDOR_ID_NVIDIA) { - acpi_skip_timer_override = 1; + nvidia_hpet_detected = 0; + acpi_table_parse(ACPI_HPET, nvidia_hpet_check); + if (nvidia_hpet_detected == 0) { + acpi_skip_timer_override = 1; + } } #endif if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) { |
