imx8mp HDMI display clock and edid

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imx8mp HDMI display clock and edid

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sakari
Contributor I

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.

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joanxie
NXP TechSupport
NXP TechSupport

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

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sakari
Contributor I

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?

 

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joanxie
NXP TechSupport
NXP TechSupport

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

joanxie_0-1700016885125.png

joanxie_2-1700016923392.png

 

joanxie_4-1700017047058.png

joanxie_5-1700017073749.png

 

 

 

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