The DW9784 VCM works and libcamera discovers it through the sensor's
ancillary link, but nothing in the software ISP ever moves it. Backport
the out-of-tree autofocus work onto v0.7.2:
- 0007-0009 are Vasiliy Doylov's focus control, contrast autofocus and
focus-loss detection from the softisp-playground branch;
- 0010 is Pavel Machek's Librem5-tested robustness work (centre-window,
brightness-normalised sharpness, two-phase sweep, settle skip),
squashed and adapted;
- 0011-0013 are ours: the lens write no longer sits inside the
no-frame-start-emitter branch, the lensless-camera paths are guarded,
and AfMode is advertised with a continuous default so that stock
applications get autofocus without sending AfTrigger.
Provenance and the adaptations made to each patch are recorded in the
patch commit messages.
