topic i.MX 6 HDMI Graphic Problem in i.MX Graphics

i.MX 6 HDMI Graphic Problem

R_Alex — Fri, 28 Jun 2024 06:22:38 GMT

Hi,

I'm pretty new to Yocto and I'm updating an old build (sumo) to scarthgap but I'm facing some issues with the HDMI.

As you can see from the attachments the splash screen it's shown correctly but the desktop it's repeated 3 times with tons of vertical lines.

The resolution it's set correctly, I've noticed something strange on the Wayland log that seems to take a refresh rate of 61Hz instead of the 60Hz, fbset return the correct data.

Thank you,

Alex

Re: i.MX 6 HDMI Graphic Problem

Bio_TICFSL — Fri, 28 Jun 2024 14:40:55 GMT

Hello,

Wayland come after the splash screen, check the pixel clock in your old bsp and new one, this can be the cause is not check the entire dtb.

Regards

Re: i.MX 6 HDMI Graphic Problem

R_Alex — Tue, 02 Jul 2024 08:57:41 GMT

Hello,
compared the mcx_edid.c files and found only two things:
the first one is the pixel clock for the first element of the video mode (line 44) and the second one is at line 492/493 that sumo has this line of code:index += index_inc;
I don't know if this cause the problem, another thing that i changed in the dts I've swapped the mxcfb0 and mxcfb1

Thank you,
Alex

Re: i.MX 6 HDMI Graphic Problem

R_Alex — Tue, 02 Jul 2024 10:18:30 GMT

I tried applying the changes in the previous message but nothing changes. I've swapped the mxcfb because otherwise I don't have output in the hdmi device even specifing video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24