iMX8QM HDMI loopback isi and display

Technical Support
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1

Hello,
I am developing using yocto bsp 5.0.
I used hdmi loopback isi for screen casting.
However, loopback and display cannot be performed at the same time.
Can imx8qm loopback and display at the same time?

2

Hi @JHLee,

Could you explain a little bit better your use-case?

Thank you.

Best regards,
André Curvello

3

Thank you for responding

I am doing v4l2 capture of HDMI output through isi loopback.
The captured screen is streaming with gstreamer RTSP.

I referred to this page, but only one of the HDMI output and isi loopback works.
I want both to run at the same time, is it possible?

4

While you loopback one DPU’s output to ISI you should be able to use the other DPU to output to a regular display.

Please note that BSP 5.0 is deprecated as we meanwhile released BSP 5.1 which will subsequently be deferred by the upcoming BSP 5.2 release.

5

Thank you for the reply.

Does that mean I can’t use HDMI and RTSP outputs at the same time with one DPU?

6

Hi @JHLee

Sorry for the delayed answer. Actually we don’t know this. You need to address this question to NXP.

Best regards,
Jaski

7

I solved this problem.
I omitted the gpio-reg from the dts file.

I’m sorry. This was my mistake.

8

Good to know, @JHLee.

No worries, glad to see that it’s working.