Re: i.mx6 camera interface (CSI) and mainline kernel

[Steve Longerbeam <steve_longerbeam@mentor.com>]

On 02/25/2016 02:05 PM, Laurent Pinchart wrote:
> Hello Philippe,
>
> CC'ing Philipp and Steve.
>
> Philipp, Steve, are you still interested in getting a driver for the i.MX6 
> camera interface upstreamed ?

Hi Laurent, Philippe(s),

I spent a few days updating my mx6-media-staging branch at
git@github.com:slongerbeam/linux-meibp-314.git, moved forward
to latest master at 4.5-rc3.

So far I have retested video capture with the SabreAuto/ADV7180 and
the SabreSD/OV5640-mipi-csi2, and video capture is working fine on
those platforms.

There is also a mem2mem that should work fine, but haven't tested yet.

I removed camera preview support. At Mentor Graphics we have made
quite a few changes to ipu-v3 driver to allow camera preview to initialize
and control an overlay display plane independently of imx-drm, by adding
a subsystem independent ipu-plane sub-unit. Note we also have a video
output overlay driver that also makes use of ipu-plane. But those changes are
extensive and touch imx-drm as well as ipu-v3, so I am leaving camera preview
and the output overlay driver out (in fact, camera preview is not of much
utility so I probably won't bring it back in upstream version).

The video capture driver is not quite ready for upstream review yet. It still:

- uses the old cropping APIs but should move forward to selection APIs.

- uses custom sensor subdev drivers for ADV7180 and OV564x. Still
  need to switch to upstream subdevs.

- still does not implement the media device framework.


Steve

>
> On Tuesday 23 February 2016 15:12:58 Philippe De Muyter wrote:
>> Update.
>>
>> On Tue, Feb 23, 2016 at 12:49:43PM +0100, Philippe De Muyter wrote:
>>> Hello,
>>>
>>> We use a custom imx6 based board with a canera sensor on it.
>>> I have written the driver for the camera sensor, based on
>>> the freescale so-called "3.10" and even "3.14" linux versions.
>>>
>>> The camera works perfectly, but we would like to switch to
>>> a mainline kernel for all the usual reasons (including being
>>> able to contribute our fixes).
>>>
>>> >From an old mail thread (*), I have found two git repositories
>>>
>>> that used to contain not-yet-approved versions of mainline
>>> imx6 ipu-v3 drivers :
>>>
>>> git://git.pengutronix.de/git/pza/linux.git test/nitrogen6x-ipu-media
>>> https://github.com:slongerbeam/mediatree.git, mx6-camera-staging
>>>
>>> I have tried to compile them with the imx_v6_v7_defconfig, but both
>>> fail directly at compile time. because of later changes in the
>>> v4l2_subdev infrastructure, not ported to the those branches.
>> What I wrote is true for Steve Longerbeam's branch, but for Philipp Zabel's
>> branch the problem (so far) was only that CONFIG_MEDIA_CONTROLLER
>> is not defined in imx_v6_v7_defconfig, but is required for a succesfull
>> compilation of Philipp's tree.
>>
>>> Can someone point me to compilable versions (either not rebased
>>> versions of those branches, or updated versions of those branches,
>>> or yet another place to look at). ?
>>>
>>> Thanks in advance
>>>
>>> Philippe
>>>
>>> (*)
>>> http://linux-media.vger.kernel.narkive.com/cZQ8NrZ2/i-mx6-status-for-ipu-> > vpu-gpu