diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2008-09-22 19:02:25 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-09-23 11:38:53 +0200 |
| commit | a8d6829044901a67732904be5f1eacdf8539604f (patch) | |
| tree | 9540f55fd2beb716a5dda0146e3e742c5a48e380 /include/asm-x86/acpi.h | |
| parent | 27ce4cb4a0c7cf59b9a9952266883862f2e4c99f (diff) | |
x86: prevent C-states hang on AMD C1E enabled machines
Impact: System hang when AMD C1E machines switch into C2/C3
AMD C1E enabled systems do not work with normal ACPI C-states
even if the BIOS is advertising them. Limit the C-states to
C1 for the ACPI processor idle code.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/acpi.h')
| -rw-r--r-- | include/asm-x86/acpi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h index 635d764dc13..35d1743b57a 100644 --- a/include/asm-x86/acpi.h +++ b/include/asm-x86/acpi.h @@ -140,6 +140,8 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate) boot_cpu_data.x86_model <= 0x05 && boot_cpu_data.x86_mask < 0x0A) return 1; + else if (boot_cpu_has(X86_FEATURE_AMDC1E)) + return 1; else return max_cstate; } |