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timer: hpet: allow overriding MIN_DELAY

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This renames MIN_DELAY to HPET_CMP_MIN_DELAY, and also allows it
to be overridden. The default delay is for HPET with relative
high frequency, and may not suitable for all HPET
implementations.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2021-05-19 14:21:40 -07:00 • committed by Carles Cufí
commit fc5f698551
1 changed files with 6 additions and 3 deletions
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9
drivers/timer/hpet.c
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@ -45,7 +45,10 @@ DEVICE_MMIO_TOPLEVEL_STATIC(hpet_regs, DT_DRV_INST(0));
#define HPET_COUNTER_CLK_PERIOD (1000000000000000ULL)
#endif
#define MIN_DELAY 1000
#ifndef HPET_CMP_MIN_DELAY
/* Minimal delay for comparator before the next timer event */
#define HPET_CMP_MIN_DELAY (1000)
#endif
static __pinned_bss struct k_spinlock lock;
static __pinned_bss unsigned int max_ticks;
@ -90,7 +93,7 @@ static void hpet_isr(const void *arg)
if (!IS_ENABLED(CONFIG_TICKLESS_KERNEL)) {
uint32_t next = last_count + cyc_per_tick;
if ((int32_t)(next - now) < MIN_DELAY) {
if ((int32_t)(next - now) < HPET_CMP_MIN_DELAY) {
next += cyc_per_tick;
}
TIMER0_COMPARATOR_REG = next;
@ -192,7 +195,7 @@ void sys_clock_set_timeout(int32_t ticks, bool idle)
cyc = (cyc / cyc_per_tick) * cyc_per_tick;
cyc += last_count;
if ((cyc - now) < MIN_DELAY) {
if ((cyc - now) < HPET_CMP_MIN_DELAY) {
cyc += cyc_per_tick;
}