diff options
Diffstat (limited to 'src/soc/intel/skylake/cpu.c')
| -rw-r--r-- | src/soc/intel/skylake/cpu.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c index f1b40f6d01..5ec002322b 100644 --- a/src/soc/intel/skylake/cpu.c +++ b/src/soc/intel/skylake/cpu.c @@ -169,15 +169,17 @@ static void configure_c_states(void) */ static void enable_pm_timer_emulation(void) { - /* ACPI PM timer emulation */ msr_t msr; + + if (!CONFIG_CPU_XTAL_HZ) + return; + /* * The derived frequency is calculated as follows: - * (CTC_FREQ * msr[63:32]) >> 32 = target frequency. - * Back solve the multiplier so the 3.579545MHz ACPI timer - * frequency is used. + * (clock * msr[63:32]) >> 32 = target frequency. + * Back solve the multiplier so the 3.579545MHz ACPI timer frequency is used. */ - msr.hi = (3579545ULL << 32) / CTC_FREQ; + msr.hi = (3579545ULL << 32) / CONFIG_CPU_XTAL_HZ; /* Set PM1 timer IO port and enable */ msr.lo = (EMULATE_DELAY_VALUE << EMULATE_DELAY_OFFSET_VALUE) | EMULATE_PM_TMR_EN | (ACPI_BASE_ADDRESS + PM1_TMR); |