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i.MX6QP: Configuring the HDMI for YUV422

Question asked by Jean-Christophe Lallemand on Feb 28, 2018
Latest reply on Mar 1, 2018 by Jean-Christophe Lallemand

Hi,

 

I'm using the HDMI output through the framebuffer device on the i.MX6QP.

I have a YUV422 video source and I'd like to emit it on the HDMI without conversion. HDMI 1.4 supports YUV422 pixel encoding.

 

As for now, the HDMI always outputs a RGB444 stream. 

 

I've tried setting fb_var_screeninfo.nonstd before passing it to ioctl(FBIOPUT_VSCREENINFO), but it seems that any non-zero value provokes the ioctl to fail.

 

I've also tried giving the kernel argument "mxcfb1:dev=hdmi,1920x1080M@60,if=UYVY16", but it doesn't change anything.

 

Thanks for your help.

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