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

Philippe De Muyter
2016-03-03T08:36:48Z

Hi Steve,

On Thu, Mar 03, 2016 at 08:19:55AM +0100, Hans Verkuil wrote:
> On 03/03/2016 03:02 AM, Steve Longerbeam wrote:
> > 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

First of all, thank you very much, Steve.

> > git@github.com:slongerbeam/linux-meibp-314.git, moved forward
> > to latest master at 4.5-rc3.

Just to be sure : do you mean https://github.com/slongerbeam/mediatree.git
or something else ?

> >
> > 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.

Is it only a problem of those sensor drivers (which exact files ?) or
is it a problem of the capture driver itself ?

I must update a sensor driver I wrote for the intdev interface found
in the freescale kernel, and I'd like to start from a working subdev
example. Which driver should I choose as an example ?

> >
> > - still does not implement the media device framework.
>
> After fixing the first two items on that list, would that be a good time to
> add this driver to staging?
>
> i.MX6 is quite popular, so having support for this device upstream would be
> very nice indeed.
>
> I'd really like to see some upstream support for this SoC soon.

There are a bunch of people expecting that (and trying to help) :)

Best regards

Philippe

>
> Regards,
>
> Hans
>
> >
> >
> > 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
> >
> >
> > --
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> >

--
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles