diff options
Diffstat (limited to 'chip')
| -rw-r--r-- | chip/it83xx/clock.c | 4 | ||||
| -rw-r--r-- | chip/it83xx/hwtimer_chip.h | 16 |
2 files changed, 16 insertions, 4 deletions
diff --git a/chip/it83xx/clock.c b/chip/it83xx/clock.c index 3927091eff..49f99a167b 100644 --- a/chip/it83xx/clock.c +++ b/chip/it83xx/clock.c @@ -571,9 +571,9 @@ defined(CONFIG_HOSTCMD_ESPI) if (IT83XX_ECPM_PLLCTRL == EC_PLL_DEEP_DOZE) { clock_ec_pll_ctrl(EC_PLL_DOZE); - /* update free running timer */ - c = 0xffffffff - IT83XX_ETWD_ETXCNTOR(LOW_POWER_EXT_TIMER); + c = LOW_POWER_TIMER_MASK - + IT83XX_ETWD_ETXCNTOR(LOW_POWER_EXT_TIMER); st_us = TIMER_32P768K_CNT_TO_US(c); sleep_mode_t1.val = sleep_mode_t0.val + st_us; __hw_clock_source_set(sleep_mode_t1.le.lo); diff --git a/chip/it83xx/hwtimer_chip.h b/chip/it83xx/hwtimer_chip.h index ef53c4e871..2ccdce1d96 100644 --- a/chip/it83xx/hwtimer_chip.h +++ b/chip/it83xx/hwtimer_chip.h @@ -19,8 +19,20 @@ #define FREE_EXT_TIMER_H EXT_TIMER_4 #define FAN_CTRL_EXT_TIMER EXT_TIMER_5 #define EVENT_EXT_TIMER EXT_TIMER_6 -#define WDT_EXT_TIMER EXT_TIMER_7 -#define LOW_POWER_EXT_TIMER EXT_TIMER_8 +/* + * The low power timer is used to continue system time when EC goes into low + * power in idle task. Timer 7 is 24bit timer and configured at 32.768khz. + * The configuration is enough for continuing system time, because periodic + * tick event (interval is 500ms on it8xxx2) will wake EC up. + * + * IMPORTANT: + * If you change low power timer to a non-24bit timer, you also have to change + * mask of observation register in clock_sleep_mode_wakeup_isr() or EC will get + * wrong system time after resume. + */ +#define LOW_POWER_EXT_TIMER EXT_TIMER_7 +#define LOW_POWER_TIMER_MASK (BIT(24) - 1) +#define WDT_EXT_TIMER EXT_TIMER_8 enum ext_timer_clock_source { EXT_PSR_32P768K_HZ = 0, |