topic Re: imx6 v4l2 4 channels tests in i.MX Processors

imx6 v4l2 4 channels tests

vaudoitlaurent — Thu, 30 Jan 2020 08:54:50 GMT

Hi all,

on our project, we have a 4.19.35 kernel, based on meta-fsl-bsp-release.

we have an video decoder isl79987 with 4 analogic camera.

We have applied the patch from this url:

iMX6DQ ISL79985/79987 MIPI CSI2 CVBS camera surround view solution for Linux BSP

and we use mxc_v4l_tvin.out test application.

Everything works well, we are able to display 4 camera stream on a hdmi screen.

Our question is related to the test application.

Indeed, we see that in this application, direct access is done to the ipu driver, but when we look at the imx-test mxc_v4l2_capture.c (here: mxc_ipudev_test.c\mxc_ipudev_test\test - imx-test - i.MX Driver Test Application Software )

we see that everything use the v4l2 framework.

So i would like to know if it is better using v4l2, or direct using ipu driver (is there better performance using ipu directly, or through v4l2)?

Is the mxc_v4l_tvin application test stored on a git repo somewhere?

Thanks in advance for your answer

Regards

Laurent

Re: imx6 v4l2 4 channels tests

igorpadykov — Fri, 31 Jan 2020 00:07:44 GMT

Hi Laurent

>i would like to know if it is better using v4l2, or direct using ipu driver (is there better

>performance using ipu directly, or through v4l2)?

seems using ipu directly better performance may be obtained.

>Is the mxc_v4l_tvin application test stored on a git repo somewhere?

one can look on mxc_v4l2_tvin.c\mxc_v4l2_test\test - imx-test - i.MX Driver Test Application Software

Best regards
igor
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Re: imx6 v4l2 4 channels tests

vaudoitlaurent — Fri, 31 Jan 2020 10:15:03 GMT

Hi Igor

thank you for your answer.

we will keep this in mind

Regards

Laurent