mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
c1c3063446
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>
33 lines
632 B
C
33 lines
632 B
C
#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
|