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This allows drivers to dynamically communicate RTC validity per-boot to prevent hctosys from setting system time from invalid RTC values. The flag defaults to true for backward compatibility with existing drivers. Signed-off-by: Akashdeep Kaur --- drivers/rtc/class.c | 15 +++++++++++++++ include/linux/rtc.h | 7 +++++++ 2 files changed, 22 insertions(+) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 01ba04028f1f..cec27c476545 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -63,6 +63,18 @@ static void rtc_hctosys(struct rtc_device *rtc) .tv_nsec = NSEC_PER_SEC >> 1, }; + /* + * If the RTC does not have valid time, do not set system time at boot. + * This can happen when RTC loses power or has never been initialized. + * PM resume compensation will still work via rtc_resume(). + */ + if (!rtc->time_is_valid) { + dev_info(rtc->dev.parent, + "hctosys: RTC time not valid, skipping\n"); + err = -EINVAL; + goto err_read; + } + err = rtc_read_time(rtc, &tm); if (err) { dev_err(rtc->dev.parent, @@ -243,6 +255,9 @@ static struct rtc_device *rtc_allocate_device(void) hrtimer_setup(&rtc->pie_timer, rtc_pie_update_irq, CLOCK_MONOTONIC, HRTIMER_MODE_REL); rtc->pie_enabled = 0; + /* Assume RTC has valid time by default. Drivers can override. */ + rtc->time_is_valid = true; + set_bit(RTC_FEATURE_ALARM, rtc->features); set_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features); diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 0f43b5027235..f6f982610938 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -152,6 +152,13 @@ struct rtc_device { time64_t offset_secs; bool set_start_time; + /* + * Set by drivers to indicate RTC has valid absolute time. + * Used to prevent hctosys from using RTC when time is invalid + * (e.g., lost power, never initialized). PM compensation is unaffected. + */ + bool time_is_valid; + #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL struct work_struct uie_task; struct timer_list uie_timer; -- 2.34.1