diff options
Diffstat (limited to 'arch/x86/include/asm/arch-apollolake/cpu.h')
| -rw-r--r-- | arch/x86/include/asm/arch-apollolake/cpu.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/include/asm/arch-apollolake/cpu.h b/arch/x86/include/asm/arch-apollolake/cpu.h index 5e906c5e7d..67d48c6109 100644 --- a/arch/x86/include/asm/arch-apollolake/cpu.h +++ b/arch/x86/include/asm/arch-apollolake/cpu.h @@ -15,6 +15,20 @@ #ifndef __ASSEMBLY__ /* Flush L1D to L2 */ void cpu_flush_l1d_to_l2(void); + +/** + * Enable emulation of the PM timer + * + * Some legacy OSes cannot tolerate the ACPI timer stoping during idle states, + * and this results in higher power consumption. ACPI timer emulation allows + * disabling of the ACPI Timer (PM1_TMR) to have no impact on the system, with + * the exception that TMR_STS will not be set on an overflow condition. All + * aligned 32-bit reads from the ACPI Timer port are valid and will behave as if + * the ACPI timer remains enabled. + * + * @pmc: PMC device + */ +void enable_pm_timer_emulation(const struct udevice *pmc); #endif #endif /* _ASM_ARCH_CPU_H */ |