Public bug reported:
On a Dell Latitude 7450, the internal IPU6 MIPI camera does not work with the
Ubuntu `7.0.0-15-generic` USBIO module stack because the USBIO auxiliary GPIO
and I2C devices are not associated with the platform's MTL-CVF ACPI nodes:
- USBIO GPIO provider: `INTC10D1` / `_UID VGPO`
- USBIO I2C adapters: `INTC10D2` / `_UID VIC0` and `INTC10D2` / `_UID VIC1`
Without that binding, `int3472-discrete` cannot resolve the GPIO provider for
the camera power resources and the OV02E10 sensor path does not probe
correctly.
## Affected System
- Hardware: Dell Latitude 7450
- OS: Ubuntu 26.04 LTS
- Kernel tested: `7.0.0-15-generic`
- USBIO bridge: `2ac1:20c9 SLS Lattice AI USB 2.0`
- Sensor path: `OVTI02E1:00` / `ov02e10`
- ACPI nodes observed:
- `/sys/bus/acpi/devices/INTC10D1:00`
- `/sys/bus/acpi/devices/INTC10D2:00`
- `/sys/bus/acpi/devices/INTC10D2:01`
## Failure Mode
Before the USBIO binding fix, the kernel logs contained:
```text
intel-ipu6 0000:00:05.0: Found supported sensor OVTI02E1:00
intel-ipu6 0000:00:05.0: Connected 1 cameras
int3472-discrete INT3472:01: cannot find GPIO chip INTC10D1:00, deferring
int3472-discrete INT3472:0c: cannot find GPIO chip INTC10D1:00, deferring
```
After partial USBIO I2C work, the OV02E10 client existed but probe still failed
without the complete binding/power path:
```text
ov02e10 i2c-OVTI02E1:00: Error writing reg 0x00fd: -6
ov02e10 i2c-OVTI02E1:00: failed to find sensor: -6
```
The media graph lacked an `ov02e10` entity and `/dev/video0` did not produce
usable frames.
## Fix
The attached patch is a reduced USBIO backport candidate for Ubuntu's
`intel-usbio-dkms_0~git202510282139.ee221eca-0ubuntu1` source.
It does the following:
- adds `INTC10D1` to the USBIO GPIO ACPI HID table,
- adds `INTC10D2` to the USBIO I2C ACPI HID table,
- sets `gpio_chip.fwnode = dev_fwnode(dev)` for ACPI GPIO lookup,
- changes `usbio_client_acpi_bind()` to search ACPI children under the USBIO
auxiliary device's parent device chain, so matching remains scoped to this
physical USBIO bridge rather than using a global HID lookup.
The patch intentionally excludes local debug instrumentation and dead-end
experiments.
## Test Case
1. Boot the affected kernel without the patch.
2. Check:
```bash
sudo journalctl -b -k --no-pager -g
'INTC10D1|INTC10D2|INT3472|OVTI02E1|ov02e10|usbio|ipu'
tools/v4l-utils/usr/bin/media-ctl -p
timeout 20s gst-launch-1.0 -v v4l2src device=/dev/video0 num-buffers=30 !
fakesink
```
Expected broken result:
- `int3472-discrete` cannot find GPIO chip `INTC10D1:00`, or
- `ov02e10` fails probing with `failed to find sensor: -6`, and
- no usable video stream from `/dev/video0`.
3. Build and boot with the attached USBIO patch.
4. Check the same commands.
Expected fixed result:
- USBIO GPIO chip is associated with `INTC10D1:00`,
- `OVTI02E1:00` binds to `ov02e10`,
- media graph contains an `ov02e10` entity linked to `Intel IPU6 CSI2 1`,
- `/dev/video0` streams successfully.
Validated locally after the reduced binding and related already-upstream power
support were present:
```text
ov02e10 16-0010 media entity present
gst-device-monitor-1.0 Video/Source reports Intel MIPI Camera (V4L2)
gst-launch-1.0 -v v4l2src device=/dev/video0 num-buffers=30 ! fakesink completes
captured frames at 1280x960 show usable video once the physical shutter is open
```
## Regression Potential
Low to moderate.
The patch adds new ACPI HIDs for MTL-CVF USBIO GPIO/I2C devices and adjusts the
existing USBIO ACPI binding helper to search ACPI companions up the current USB
device's parent chain. It deliberately avoids a global
`acpi_dev_get_first_match_dev()`
fallback, so systems with multiple USBIO bridges or multiple `INTC10D2` islands
should not bind to an unrelated ACPI node.
The GPIO fwnode assignment is required for ACPI GPIO lookup by consumers such
as INT3472.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "0001-usbio-bind-dell-mtl-cvf-acpi-nodes.patch"
https://bugs.launchpad.net/bugs/2154140/+attachment/5973223/+files/0001-usbio-bind-dell-mtl-cvf-acpi-nodes.patch
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https://bugs.launchpad.net/bugs/2154140
Title:
USBIO MTL-CVF ACPI binding missing for Dell Latitude 7450 IPU6 camera
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