[QUESTION] Enable PINEBOOK Pro's display

[Jian-Hong Pan]

Hi,

We have a PINEBOOK Pro [1] equipped with Rockchip RK3399.
I tried linux-next kernel at tag 5.9.0-rc5-next-20200915 with the
build config [2].  However, the drm seems failed and also leads Xorg
failed.

Here is the log [3]:

kernel: rockchip-dp ff970000.edp: no DP phy configured
kernel: cdn-dp fec00000.dp: [drm:cdn_dp_probe [rockchipdrm]] *ERROR*
missing extcon or phy
kernel: cdn-dp: probe of fec00000.dp failed with error -22
...
gdm-Xorg-:0[660]: (EE) open /dev/fb0: No such file or directory
gdm-Xorg-:0[660]: (EE) No devices detected.
gdm-Xorg-:0[660]: (EE)
gdm-Xorg-:0[660]: Fatal server error:
gdm-Xorg-:0[660]: (EE) no screens found(EE)

Do I miss something?  Any guidance will be appreciated.

[1] https://www.pine64.org/pinebook-pro/
[2] https://gist.github.com/starnight/66d27f7888d599247371adb1575d1092#file-config
[3] https://gist.github.com/starnight/66d27f7888d599247371adb1575d1092#file-journal-log

Jian-Hong Pan