On Tue, 23 Apr 2019, Daniel Drake wrote:
> /* Default timer init function */
> void __init hpet_time_init(void)
> {
> - if (!hpet_enable())
> - setup_pit_timer();
> + if (hpet_enable()) {
> + setup_default_timer_irq();
> + return;
> + }
> +
> +
Modern Intel SoCs now include a special ITSSPRC register that can be
used to "gate" the PIT such that IRQ0 interrupts do not fire.
With Intel Apollo Lake we are starting to see consumer products that
have a BIOS option to apply this (defaulting to gated). Some such
products also lack the HPET ACPI
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