Intel AtomISP v2 power and camera-LED quirks for Bay Trail and Cherry Trail
Two small support drivers for the image signal processor built into Intel's Bay Trail and Cherry Trail Atom SoCs, which powered low-cost tablets and 2-in-1 laptops sold roughly between 2013 and 2016. One piece parks the ISP in a deep power state so the system can reach modern low-power idle, and the other handles camera-indicator LED firmware quirks on specific machines like the Asus T100TAF.
recommendation
Worth keeping but documenting its niche, because the hardware hasn't been sold new since around 2016 and code activity has dwindled to occasional small fixes (the most recent substantive change was a 2022 LED tweak). Even so, a meaningful number of Bay Trail and Cherry Trail tablets are still in use, and without these tiny shims they would either burn power needlessly or expose the wrong camera LED behavior, with no replacement driver available.
repository signals
sources
- lore.kernel.org
Latest substantive upstream touch I found for this directory was a 2022 platform/x86 fix extending LED handling to Asus T100TAF, indicating occasional maintenance but no sustained activity.
- lore.kernel.org
The directory itself was created by a 2021 move into the Intel subdirectory, not by a major functional expansion.
- cateee.net
LKDDb describes this as a dummy/power-management driver for Intel AtomISP v2 on Bay Trail and Cherry Trail, matching PCI IDs 8086:0f38 and 8086:22b8.
- cateee.net
LKDDb describes the companion LED quirk driver as applying only to known Bay Trail/Cherry Trail systems with camera-LED firmware issues.
- intel.com
Intel ARK marks Bay Trail products as former products, consistent with no new 2025 sales.
- intel.com
Intel ARK marks Cherry Trail products as former products; newest listed launches are in 2015-2016, supporting a legacy-only deployment profile.
codex reasoning notes (technical)
Local `exec_command` inspection showed this is a real driver directory with one PCI PM driver and one LED quirk driver; Kconfig says the PM piece only forces the ISP into D3/S0ix-friendly state and the LED piece covers known Bay/Cherry Trail camera LED quirks. Lore evidence came from `git log` output, which exposed the two lore links above; I found no removal-series evidence in the limited budget, and the latest substantive change was a small 2022 device-match fix rather than ongoing active development. Deployment evidence came from `web.search_query` results on LKDDb and Intel ARK former-product pages: hardware is long out of market, but legacy Bay/Cherry Trail tablets/2-in-1s likely still exist in small numbers. Because the code is low-churn, narrowly scoped, and has no obvious replacement for its specific power/LED quirk role, I recommend keep-annotate rather than deprecate/remove.