Felipe Moura 89b8c5fc7f espressif: stop double-counting light sleep in the system clock ... esp_pmstandby() fed up_step_idletime() the sleep duration it *asked* for (time_in_us) rather than the one it actually got (rtc_diff_us), and did so unconditionally. Both halves are wrong. esp_pm_light_sleep_start() already stalls and restores the systimer itself, but only where SOC_SLEEP_SYSTIMER_STALL_WORKAROUND is defined -- esp32c3 and esp32p4. On every other SoC, esp32s3 included, the systimer keeps counting straight through light sleep, so the time is already in the clock and stepping it again adds it twice. Measured on an esp32s3-xiao: over 54 min with 1919 light sleeps totalling 454.7 s, the monotonic clock ran 443.2 s fast -- 0.97 of the time slept, i.e. counted exactly twice, leaving the clock 13.8% fast. Anything that reconstructs wall time from CLOCK_MONOTONIC inherits that error; for this collar it corrupted every IMU sample timestamp. Invisible until light sleep started happening for real, because a board that never sleeps never steps the clock. Note for upstream: the risc-v copy here only switches to the measured duration and does not gate on SOC_SLEEP_SYSTIMER_STALL_WORKAROUND. The two should be reconciled before this is proposed -- it is kept as-is so the asymmetry is visible rather than silently decided. Signed-off-by: Felipe Moura <moura.fmo@gmail.com> Assisted-by: Claude:claude-opus-5		2026-09-22 19:30:21 +08:00
..
include	xtensa: Support BUILD_KERNEL.	2026-09-10 23:28:43 +08:00
src	espressif: stop double-counting light sleep in the system clock	2026-09-22 19:30:21 +08:00
CMakeLists.txt
Kconfig	arch/atomic: remove up_testset in spinlock	2026-09-08 08:58:54 +08:00