imx8m: Failed to attach bridge

[Fabio Estevam]

Hi Martin and Guido,

I am trying to get MIPI DSI panel to work on an imx8mq-evk board.

Here are the changes I did against linux-next 20200914 following what
was done on imx8mq-librem5-devkit.dts:
https://pastebin.com/raw/GXazRyNx

The config I am using is this one:
https://pastebin.com/raw/UGAjTQyg

This is what I see in dmesg:

[    1.666974] mxsfb 30320000.lcd-controller: [drm:mxsfb_probe]
*ERROR* failed to attach bridge: -517
[    1.667309] sdhci-esdhc-imx 30b50000.mmc: Got CD GPIO
[    1.675977] mxsfb 30320000.lcd-controller: Cannot connect bridge: -517
[    1.689620] mxsfb 30320000.lcd-controller: [drm:mxsfb_probe]
*ERROR* failed to attach bridge: -517
[    1.692019] mmc0: SDHCI controller on 30b40000.mmc [30b40000.mmc] using ADMA
[    1.698606] mxsfb 30320000.lcd-controller: Cannot connect bridge: -517
[    1.711321] mmc1: SDHCI controller on 30b50000.mmc [30b50000.mmc] using ADMA
[    1.721418] mxsfb 30320000.lcd-controller: [drm:mxsfb_probe]
*ERROR* failed to attach bridge: -517
[    1.730422] mxsfb 30320000.lcd-controller: Cannot connect bridge: -517

Any ideas as to what I am missing?

Thanks,

Fabio Estevam