diff options
| author | Alexey Starikovskiy <aystarik@gmail.com> | 2007-11-26 22:42:19 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-11-26 22:42:19 +0300 |
| commit | c1c306344669ca40255e36192b101060ffbb1271 (patch) | |
| tree | 292c7936d91b8ed2febb3e2902de41d0e6c84bca /include/asm-x86 | |
| parent | d4d25deca49ec2527a634557bf5a6cf449f85deb (diff) | |
| download | linux-c1c306344669ca40255e36192b101060ffbb1271.tar.xz | |
ACPI: Set max_cstate to 1 for early Opterons.
AMD Opteron processors before CG revision don't like C-states > 1.
This solves the long standing bugzilla #5303 and probably some more
on affected machines:
http://bugzilla.kernel.org/show_bug.cgi?id=5303
[ tglx@linutronix.de: reworked the patch so it does not wreck ia64 ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86')
| -rw-r--r-- | include/asm-x86/acpi.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h index 0693689d4146..f8a89793ac8c 100644 --- a/include/asm-x86/acpi.h +++ b/include/asm-x86/acpi.h @@ -1,5 +1,32 @@ +#ifndef _ASM_X86_ACPI_H +#define _ASM_X86_ACPI_H + #ifdef CONFIG_X86_32 # include "acpi_32.h" #else # include "acpi_64.h" #endif + +#include <asm/processor.h> + +/* + * Check if the CPU can handle C2 and deeper + */ +static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate) +{ + /* + * Early models (<=5) of AMD Opterons are not supposed to go into + * C2 state. + * + * Steppings 0x0A and later are good + */ + if (boot_cpu_data.x86 == 0x0F && + boot_cpu_data.x86_vendor == X86_VENDOR_AMD && + boot_cpu_data.x86_model <= 0x05 && + boot_cpu_data.x86_mask < 0x0A) + return 1; + else + return max_cstate; +} + +#endif |