i.MX ProcessorsのトピックRe: IMX8MP 1280x800 HDMI Output

IMX8MP 1280x800 HDMI Output

justinnoel — Fri, 29 Nov 2024 17:08:48 GMT

I have a 1280x800 HDMI display that requires the following timing. This is not in the list of out of the box mode lines.

Signal Item Symbol Min. Typ. Max. Unit
DCLK Frequency 1/Tc 50 71 80 MHz
DE Vertical Total Time TV 810 823 1023 TH
Vertical Addressing Time TVD 800 800 800 TH
Horizontal Total Time TH 1360 1440 1800 Tc
Horizontal Addressing Time THD 1280 1280 1280 Tc

I was able to add a mode that displays the correct image, but the image flickers and goes in and out. What mode line and clock can I use to support this display? Thank you in advance!

Re: IMX8MP 1280x800 HDMI Output

Bio_TICFSL — Mon, 02 Dec 2024 20:12:11 GMT

Hello,

Is not in the list in not supported, you should add it to the bsp.

Regards

Re: IMX8MP 1280x800 HDMI Output

justinnoel — Mon, 02 Dec 2024 20:36:26 GMT

I have added 1280x800 to the BSP, but I get flicker. I have seen other posts here where a tool is mentioned and clock/timing parameters are created. The solution involved adding a clock to samsung_phy_pll_cfg. Those posts have an 83.5Mzh clock, but as you see in my data sheet the max clock is 80Mzh I tired replying to another one of these posts, but I did not get a response. For example these posts mention editing samsung_phy_pll_cfg.

https://community.nxp.com/t5/i-MX-Processors/IMX8M-plus-1280-800-resolution/m-p/2000207#M231122

https://community.nxp.com/t5/i-MX-Processors/IMX8M-plus-1280-800-resolution/m-p/1732918