Re: imx6: Cannot register mem2mem

[Steve Longerbeam <slongerbeam@gmail.com>]

On 4/6/20 11:39 AM, Fabio Estevam wrote:
> Hi Steve,
>
> On Mon, Apr 6, 2020 at 2:46 PM Fabio Estevam <festevam@gmail.com> wrote:
>
>>>    &mipi_csi {
>>> -       status = "okay";
>>> +       status = "disabled";
>> I tried this suggestion and then mem2mem is successfully probed.
> Ok, so now I connected the ov5640 module as per your suggestion and
> this is what I get with a clean 5.6.2:
>
> [    6.618296] imx-media: ov5640 1-003c:0 -> imx6-mipi-csi2:0
> [    6.644522] imx-media: Registered ipu_ic_pp csc/scaler as /dev/video8

This shows that imx-media completed probe (v4l2 core called its probe 
complete callback).

>
> However,  the v4l2video8convert Gstreamer element is not detected:
>
> # gst-inspect-1.0 | grep convert
> video4linux2:  v4l2convert: V4L2 Video Converter
> audioconvert:  audioconvert: Audio converter
>
> If I do the kernel hack I mentioned previously then I can get v4l2video8convert:
>
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -213,10 +213,6 @@ v4l2_async_notifier_try_complete(struct
> v4l2_async_notifier *notifier)
>          if (!notifier->v4l2_dev)
>                  return 0;
>
> -       /* Is everything ready? */
> -       if (!v4l2_async_notifier_can_complete(notifier))
> -               return 0;
> -
>          return v4l2_async_notifier_call_complete(notifier);

That's very odd, because v4l2_async_notifier_call_complete() was 
definitely called on the imx-media root notifier from above.

Is there is another v4l2 driver that is not completing?

Steve

>   }
>
> # gst-inspect-1.0 | grep convert
> video4linux2:  v4l2video11convert: V4L2 Video Converter
> video4linux2:  v4l2video10convert: V4L2 Video Converter
> video4linux2:  v4l2video9convert: V4L2 Video Converter
> video4linux2:  v4l2convert: V4L2 Video Converter
> audioconvert:  audioconvert: Audio converter
>
> What am I missing in order to get the v4l2videoXconvert Gstreamer
> element without hacking the kernel?
>
> Thanks