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Diffstat (limited to 'src/soc/intel/apollolake/pmutil.c')
-rw-r--r--src/soc/intel/apollolake/pmutil.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/src/soc/intel/apollolake/pmutil.c b/src/soc/intel/apollolake/pmutil.c
index c6d2eec791..e0de93eae4 100644
--- a/src/soc/intel/apollolake/pmutil.c
+++ b/src/soc/intel/apollolake/pmutil.c
@@ -180,15 +180,17 @@ int soc_prev_sleep_state(const struct chipset_power_state *ps,
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_PM_TMR_EN | (ACPI_BASE_ADDRESS + R_ACPI_PM1_TMR);
wrmsr(MSR_EMULATE_PM_TIMER, msr);