port-evbarm/56650: sunxidrm fails to attach a console on pinebook

[macallan1888%gmail.org@localhost]

>Number:         56650
>Category:       port-evbarm
>Synopsis:       sunxidrm fails to attach a console on pinebook
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 21 19:00:00 +0000 2022
>Originator:     Michael Lorenz
>Release:        9.99.93
>Organization:
TNF
>Environment:
NetBSD pinebook 9.99.93 NetBSD 9.99.93 (GENERIC64) #4: Thu Jan 20 22:39:15 EST 2022  ml@paddy:/disk/build/obj_earm64/sys/arch/evbarm/compile/GENERIC64 evbarm

>Description:
after updating kernel and dtbs sunxidrm errors out and leaves a blank screen on pinebook, the machine boots otherwise and can be talked to via ssh. New kernel and older dtbs work.
Relevant dmesg snippets:
[     1.000003] sunxilcdc0 at simplebus1: TCON0
[     1.000003] sunxilcdc0: autoconfiguration error: endpoint: missing reg propertysunxilcdc0: interrupting on GIC irq 118
[     1.000003] sunxilcdc1 at simplebus1: TCON1
...
[     1.000003] /soc/timer@1c20c00 at simplebus1 not configured
[     1.000003] sunxidrm0: autoconfiguration error: failed to activate endpoint: 19
[     1.000003] sunxidrm0: autoconfiguration error: failed to activate endpoint: 19
[     1.000003] sunxidrm0: info: [drm] Cannot find any crtc or sizes
[     1.000003] kern info: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[     1.000003] kern info: [drm] No driver support for vblank timestamp query.
[     1.000003] kern info: [drm] Initialized sunxi 1.0.0 20190123 for sunxidrm0 on minor 0
[     1.000003] sunxidrm0: initialized sunxi 1.0.0 20190123 on minor 0

Jun Ebihara seems to have encountered the same problem ( see port-arm@, 'pinebook status update (20220119)' ):
Problems:
- pinebook: 
  need backout dts.tgz to 202111060010Z.due to display issue.

>How-To-Repeat:
boot -current with recent dtbs on a pinebook
>Fix:
put old dtbs back as a workaround