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| author | Mulin Chao <mlchao@nuvoton.com> | 2021-04-18 22:29:28 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-04-21 04:41:01 +0000 |
| commit | 9a7702b34b1c2246bb094de1c9d86c7cf892b2cc (patch) | |
| tree | 9126b6334210df5d58a54e9938ce073ed01ae1f1 | |
| parent | 1eb4fcc824a54ab9b1f538fb8c4e97e6add89933 (diff) | |
| download | chrome-ec-9a7702b34b1c2246bb094de1c9d86c7cf892b2cc.tar.gz | |
power: go to hibernate mode immediately if woken up by rtc overflow.
If platform uses PSL (Power Switch Logic) for hibernating and RTC is
also supported, this CL determines whether ec is woken up by RTC with
overflow event (16 weeks). If so, let it go to hibernate mode
immediately for better power consumption.
BRANCH=none
BUG=b:171919875
TEST= test console command "hibernate" with NPCX_LCT_MAX = 1000 and
enable chipset_task on npcx9 EVB.
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
Change-Id: I52543ee3cd980d444758c6a0cab32c34bd690b9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2835259
Reviewed-by: Wai-Hong Tam <waihong@google.com>
| -rw-r--r-- | chip/npcx/system.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/chip/npcx/system.c b/chip/npcx/system.c index da688c2c42..3f6f5d9ccd 100644 --- a/chip/npcx/system.c +++ b/chip/npcx/system.c @@ -45,6 +45,11 @@ #define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) #define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args) +#if defined(NPCX_LCT_SUPPORT) +/* A flag for waking up from hibernate mode by RTC overflow event */ +static int is_rtc_overflow_event; +#endif + /*****************************************************************************/ /* Internal functions */ @@ -328,6 +333,15 @@ static void chip_set_hib_flag(uint32_t *flags, uint32_t hib_wake_flags) if (npcx_lct_is_event_set()) { *flags |= EC_RESET_FLAG_RTC_ALARM | EC_RESET_FLAG_HIBERNATE; + /* Is RTC overflow event? */ + if (bbram_data_read(BBRM_DATA_INDEX_LCT_TIME) == + NPCX_LCT_MAX) { + /* + * Mark it as RTC overflow event and handle it + * in hook init function later for logging info. + */ + is_rtc_overflow_event = 1; + } npcx_lct_clear_event(); return; } @@ -1134,6 +1148,23 @@ int system_is_reboot_warm(void) return 1; } +#if defined(CONFIG_HIBERNATE_PSL) && defined(NPCX_LCT_SUPPORT) +static void system_init_check_rtc_wakeup_event(void) +{ + /* + * If platform uses PSL (Power Switch Logic) for hibernating and RTC is + * also supported, determine whether ec is woken up by RTC with overflow + * event (16 weeks). If so, let it go to hibernate mode immediately. + */ + if (is_rtc_overflow_event){ + CPRINTS("Hibernate due to RTC overflow event"); + system_hibernate(0, 0); + } +} +DECLARE_HOOK(HOOK_INIT, system_init_check_rtc_wakeup_event, + HOOK_PRIO_DEFAULT - 1); +#endif + /*****************************************************************************/ /* Console commands */ void print_system_rtc(enum console_channel ch) |