REGRESSION: ipu3-imgu: commit a66191c590b3b58eaff05d2277971f854772bd5b breaks camera functionality on Surface Go 2

[Michael Anthony <manthony.nw@outlook.com>]

Hello,

I am reporting a regression in the IPU3-IMGU driver introduced in the 6.19 kernel cycle.

Regression Description:
Following the upgrade from kernel 6.18 to 6.19 on Fedora Linux, the IPU3 camera on my [Device Model, e.g., Surface Go 2] has stopped functioning. While the modules (ipu3_cio2, ipu3_imgu) load, user-space tools like libcamera can no longer initialize the device.

Suspected Commit:
"media: ipu3-imgu: Drop struct imgu_device v4l2_file_ops field"
Commit: a66191c590b3b58eaff05d2277971f854772bd5b
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a66191c590b3b58eaff05d2277971f854772bd5b

Impact:
This change seems to have removed a field that libcamera or the V4L2 sub-device internal routing relies upon for this specific hardware. Reverting to the 6.18 kernel restores full functionality.

System Information:

Distribution: Fedora 43

Kernel version: 6.19.x (Broken) / 6.18.x (Working)

I can provide dmesg logs if required. Please let me know if you need a full media-ctl topology output from the working vs. non-working kernels.

Best regards,

Michael Anthony