Which fixes most glitches sometimes visible when using the sw-ISP with
clients that directly import the buffers to the GPU, such as Snapshot
47.
The patch will be part of the next libcamera release, which however
does not have a clear release date yet.
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In upstream discussions regarding dmabuf allocation in was concluded
that using udmabuf, which only uses virtual memory, is the better
option for the time being. Libcamera gained support for that with
version 0.3.1 and it was confirmed that devices currently using the
libcamera softwareISP can sample from them, notably:
- Librem5
- PinePhone
- Pixel 3a
Thus let's follow upstream and allow access to that by default - and
remove access to /dev/dma_heap again.
See also: https://github.com/systemd/systemd/pull/33738
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Rebase our downstream patches and drop the one included in the release.
See https://gitlab.freedesktop.org/camera/libcamera/-/releases/v0.3.1
Notes:
- The abi-compliance checker reports 100% binary and source compatibility,
so this release does not change the SONAME.
- qcam has been ported to QT6.
- This release has some notable improvements to the PPP/rkisp1, however
lower frame rates might be encountered sometimes. This will hopefully
get fixed in the imx258 driver in Linux 6.11.
- The swISP got some fixes but nothing major apart from the patch we
were already carrying.
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Which can have significant performance impact on affected devices,
such as the Librem5 or the PinePhone.
The patch already landed upstream, however a new release is likely
several weeks or months away, making a backport worthwhile.
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which are probably too experimental to ask Alpine to carry them, while being
very helpful for devices that pmOS targets. The explicit goal is to help
Libcamera development and drop the fork again.
For the dma heaps permissions see the ongoing debate in
https://lore.kernel.org/all/bb372250-e8b8-4458-bc99-dd8365b06991@redhat.com/
It's possible that Libcamera will switch to another solution in a future
release or that memory accounting issues around dma heaps will need to
get fixed in the kernel before the permissions can be set by default by
distros.
Regarding `libcamera: simple:` patches:
- 0001-0003 can likely be dropped once the Libcamera SoftISP gains
support for raw (bayer) streams passthrough (on top of converting to
RGB or YUV formats).
- 0004 will likely be needed until Megi downstream patches for the
Pinephone get improved/upstreamed and Libcamera adopted accordingly.
With these patches libcamera and pipewire based applications should work
on the Librem5, Pinephone and - hopefully soon - devices like the OP6.
See https://gitlab.com/postmarketOS/pmaports/-/merge_requests/5162 for
more context.
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