imx8mp HDMI display clock and edid

[sakari]

Hi,

I'm using imx8mp based evaluation kit with linux build from yocto.

I have a 1:1 display that supports 2560x2560 resolution with fps ranging from 60-90hz connected to HDMI.

The system fails to parse the display EDID file.

Do you have a guide how to add custom resolution patch to kernel or otherwise create and use custom made edid?

I attached the edid file.

[joanxie]

I need to know what kind of pixel clock you need?

[sakari]

Hi,
I think I want 210800000 for 2560x2560@30 and 112580000 for 60fps of 1280x1280.

I took these values from wxedid.

From the linux source drivers/gpu/drm/imx/mhdp/cdns-mhdp-hdmi-phy.c, there seems to be some static clocks.

So I actually need 198000000 for 2560x2560 and 99000000 for 12801280?

[joanxie]

couldn't guarantee that all of resolution can be supported by current bsp, but you can try it, try to add these parameters in the table to the samsung_phy_pll_cfg of phy-fsl-samsung-hdmi.c