Public bug reported:
Applied upstream patch
`patch/v6.14/0022-media-ov08x40-Add-support-for-2-4-lanes-support-at-1.patch`
references to a V4L2 API `v4l2_link_freq_to_bitmap` that is only available
since v6.9-rc1 commit ("a68e88e2cf9e4 media: v4l: Add a helper for setting up
link-frequencies control"). This causes following error:
```
/var/lib/dkms/ipu6-drivers/0~git202511120800.9766e218/build/drivers/media/i2c/ov08x40.c:
In function ‘ov08x40_check_hwcfg’:
/var/lib/dkms/ipu6-drivers/0~git202511120800.9766e218/build/drivers/media/i2c/ov08x40.c:4028:15:
error: implicit declaration of function ‘v4l2_link_freq_to_bitmap’
[-Werror=implicit-function-declaration]
4028 | ret = v4l2_link_freq_to_bitmap(dev, bus_cfg.link_frequencies,
| ^~~~~~~~~~~~~~~~~~~~~~~~
LD [M]
/var/lib/dkms/ipu6-drivers/0~git202511120800.9766e218/build/drivers/media/i2c/ov13858.o
```
While this is a dkms, people take new dkms and compile against older
kernels, so even v6.11 kernels are not in Resolute/Questing, the dkms
itself deserves a fix.
** Affects: ipu6-drivers (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2134838
Title:
failed to build against linux kernel < v6.9
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