TW9992 with iMX8MP produces double image

[mablabs]

Hi,

I've been successful so far in integrating the TW9992 decoder chip with the iMX8MP. Unfortunately, the picture that is produced is double (I expect a 720x480 frame, but get two 720x240 frames) - see image below. Due to hardware requirements, I have to ISI1 for the decoder chip interface. Does this mean that the video output is interlaced? If so, is there a way that I can deinterlace the video on the iMX8MP?

Thank you,

Mohammed

[mablabs]

Hi Igor,

Thanks for getting back to me. Just to confirm, the patch only supports blending deinterlacing, and since I can't use blending (because I'm using ISI1 and blending is only supported on ISI0), I would have to modify the patch to support weaving (or line doubling) based de-interlacing. 

Thanks

Mohammed

[igorpadykov]

Hi Mohammed

for isi deinterlacing one can try to adapt patches from

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/ISL79987-and-adv7180-de-interlace-driver...

recommended to use mx8_v4l2_cap_drm for testing:

https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_v4l2_test/mx8_v4l2_cap_drm.c?h=lf-...

use sect.13.4.3.4.1 Configuring de-interlacing  i.MX 8M Plus Applications Processor Reference Manual

Best regards
igor

[mablabs]

Hi Igor,

Thanks for getting back to me. Just to confirm, the patch only supports blending deinterlacing, and since I can't use blending (because I'm using ISI1 and blending is only supported on ISI0), I would have to modify the patch to support weaving (or line doubling) based de-interlacing. 

Thanks

Mohammed