877d1537df
up_idlepm() (esp32s3_idle.c/esp32_idle.c/esp32s2_idle.c and the
shared risc-v esp_idle.c for esp32c3/esp32c6) has a recovery branch
that forces the domain back to PM_NORMAL when oldstate is not
PM_NORMAL and nothing is currently staying at it:
pm_stay(PM_IDLE_DOMAIN, PM_NORMAL);
pm_changestate(PM_IDLE_DOMAIN, PM_NORMAL);
newstate = PM_NORMAL;
pm_stay() here has no matching pm_relax() anywhere in any of the
four files. The first time this branch runs, the stay count for
PM_NORMAL never returns to 0, and pm_checkstate() (called
unconditionally right after this block) can never recommend
anything deeper than PM_NORMAL again for the rest of uptime -- the
idle loop keeps running, but the governor is permanently pinned at
full power, with no further light or deep sleep.
Confirmed on real ESP32-S3 hardware (XIAO ESP32-S3,
CONFIG_ESPRESSIF_WIFI + CONFIG_PM + CONFIG_SCHED_TICKLESS): reading
g_pmdomains[0] live via JTAG/GDB showed a "system" wakelock stuck at
state=PM_NORMAL, count=1, acquired a few seconds after boot (right
when Wi-Fi coming up briefly moves the domain off PM_NORMAL and this
branch then forces it back). Reproduced 4/4 times before this fix
(never a single PM_STANDBY transition or light-sleep-return log line
across a 40+ minute run), 0/4 after.
The trigger is timing-dependent (whether anything else already
holds PM_NORMAL at the moment this branch runs), which is likely why
it does not reproduce on every single boot.
Fix: release the stay right after the one pm_changestate() call it
exists to force, matching the comment already there ("Keep working
in normal stage") -- a one-shot nudge, not a standing hold.
Touching the switch statement right below the fix in all four files
exposed a pre-existing nxstyle violation (case labels indented level
with the switch's opening brace instead of one level in from it, per
NuttX style); reindented alongside since checkpatch lints the whole
file. esp32s3_idle.c also had two unrelated stray-indented lines
("Perform IDLE mode power management" / up_idlepm()) in up_idle();
fixed those too, same reason.
Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
Assisted-by: Claude:claude-sonnet-5
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|---|---|---|
| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.