Bringing up the i.MX8QM Display Port

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Bringing up the i.MX8QM Display Port

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yavuz_mutlu
Contributor II

Hi all,

We are trying to use the display port for i.MX8QM. Our hardware guys designed the HDMI display port converter PCB which is:

yavuz_mutlu_0-1625147150898.png

We changed the hdmi device tree with

&hdmi {
compatible = "cdn,imx8qm-dp";
firmware-name = "dpfw.bin";
lane-mapping = <0x1b>;
status = "okay";
};

However, the dpfw firmware load seems to be failing.

[ 3.148361] cdns-mhdp-imx 56268000.hdmi: lane-mapping 0x1b
[ 3.156010] [drm] Started firmware!
[ 3.159613] cdns-mhdp-imx 56268000.hdmi: Direct firmware load for dpfw.bin failed with error -2
[ 3.168340] cdns-mhdp-imx 56268000.hdmi: Falling back to sysfs fallback for: dpfw.bin
[ 3.176214] [drm] HDP FW Version - ver 34219 verlib 20560
[ 3.190774] cdns-mhdp-imx 56268000.hdmi: wrong link rate index

 

Is there anything missing? Do we have to change anything besides the device tree parameters (u-boot etc.)?

PS: Our BSP is Yocto Linux 5.4.70.

Thanks in advance.

 

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2 Replies

676 Views
yavuz_mutlu
Contributor II

Hi Joan,

I've sent the schematic to you in private message.

Thanks.

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684 Views
joanxie
NXP TechSupport
NXP TechSupport

your schematic isn't clear enough, do you mind uploading as attachment again?

 

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