Capture image from imx219 sensor on i.MX8MM

[Laurent Pinchart]

On Mon, Feb 06, 2023 at 04:38:27PM +0100, Frieder Schrempf wrote:
> On 06.02.23 16:31, Laurent Pinchart wrote:
> > On Mon, Feb 06, 2023 at 03:24:41PM +0100, Frieder Schrempf wrote:
> >> Hi,
> >>
> >> I'm trying to get a camera stream on our i.MX8MM board up and running
> >> with Linux 6.1. I'm using the RPi v2.1 camera module (imx219) as sensor.
> >>
> >> I basically copied the devicetree setup from Tim's overlay at
> >> arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx-0x-imx219.dts.
> >>
> >> With all the drivers enabled the devices (imx219, imx7-media-csi,
> >> imx-mipi-csis) seem to probe just fine and I see /dev/video0 and
> >> /dev/media0.
> >>
> >> For the v4l subdevices I would expect to see one for the sensor and one
> >> for the CSI bridge. But only the latter is there (see below).
> >>
> >> Is this correct? Am I missing something? How can I setup/enable the
> >> pipeline/stream?
> > 
> > Your expectations are correct, but the result isn't. You should see the
> > camera sensor in the media graph. Has the imx219 been probed by the
> > driver ? Did probe succeed ?
> 
> Yes, the imx219_probe() works just fine and returns with code 0. I also
> see v4l2_async_register_subdev_sensor() and the underlying code being
> called.
> 
> So I really don't understand why I'm missing the sensor subdev. Any
> ideas how to continue debugging?

The issue seems to be with v4l2-async then. There's a debugfs file that
lists the missing v4l2-async subdevs (I don't recall the path by heard),
that can give useful information. Enabling the debug messages from
v4l2-async.c may helpt too.

-- 
Regards,

Laurent Pinchart