[Linaro-mm-sig] Minutes from V4L2 update call

[Sumit Semwal]

Hi Kiko, everyone,

Some update on my Action items:
On 22 March 2012 20:24, Christian Robottom Reis <kiko at linaro.org> wrote:
> Hey there,
>
>    We ran a call today on the topics of V4L2/dmabuf integration and the
> DMA mapping changes; I've included minutes and actions below.
>
> In summary:
>
>    - We're not going to see the V4L2 patches in 3.4; they haven't had
>      enough review or testing and Mauro is very busy this merge window.
>
>    - We're going to put in effort to validate the work on Exynos4 and
>      OMAP4 using test applications that Rob and Tomasz are maintaining.
>
>    - Sumit's maintaining an up-to-date branch containing all the
>      in-flight DRM/V4L2/dmabuf-dependent work that we can carry
>      meanwhile:
>        http://git.linaro.org/gitweb?p=people/sumitsemwal/linux-3.x.git;a=shortlog;h=refs/heads/umm-3.3-wip
>
> Laurent, I missed one thing that you mentioned in the call and it's
> included in an XXX: below; if you could note what it was it would be
> great.
>
> Please feel free to correct my possibly wild misunderstandings in the
> minutes and summary above. Thanks!
>
> Attendees are all on the To: line.
>
>    Tomasz: At the moment, have PoC support for import/export dma-buf
>        for V4L2
>        Modified patches by Sumit
>        Supporting importer of dma-buf
>        Exynos DRM and drm-prime
>
>        Test application worked fine for V4L capture and DRM output
>        Test application between two V4L devices
>
>        Laurent has sent in review comments
>
>    Tomasz: proposed extension to DMA Mapping -- dma_get_pages
>        Currently difficult to change the camera address into list of pages
>        DMA framework has the knowledge of this list and could do this
>
>            Depends on dma_get_pages
>            Needs to be merged first
>
>        Test application posted to dri-devel with dependencies to run demo
>            Many dependencies
>
>    Topic: dmabuf importer from V4L2
>        For sharing with DRM do not need exporter
>        Need some patches added to DRM
>            prime
>            prime for Exynos
>            drm-prime
>                ACTION: Tomasz to check with Inki Dae and David A. on
>                status
<snip>
>                ACTION: Sumit to look into VV driver used for v4l2 testing
>                    needs importer and exporter
I will start looking into this soon - though most likely, it should be
simple enough if Vivi is using dma-contig allocator of videobuf2.
>
<snip>
>    Tomasz could use the 3.3-WIP branch
>        Sumit: rebasing not a good idea, but could pull in for-next
>            Suggests Tomasz bases work on Linus' mainline
>                Had problems with Tomasz' branch that is based on -next
>            His branch includes Tomasz RFCv2 patches as well
>        Laurent: agree with Sumit
>            ACTION: Sumit to email Tomasz and CC: Inki Dae
>            ACTION: send around latest drm-prime branch
I will send this email by today - Dave A has posted the next version
of DRM Prime a short while back.
>
<snip>
-- 
Thanks and regards,

Sumit Semwal

Linaro Kernel Engineer - Graphics working group

Linaro.org │ Open source software for ARM SoCs

Follow Linaro: Facebook | Twitter | Blog