[Letux-kernel] DSI panels with omapdrm on 4.20-rc

[H. Nikolaus Schaller]

Hi Tomi,
4.20-rc1 seems to have broken our DSI panel driver for the OMAP5 Pyra.

There were some omapdrm API changes which I have tried to fix by inspecting
panel-dsi-cm.c and also comparing with panel-tpo-td028ttec1.c (which is still working
on our omap3 systems).

I also have removed the tiler patches by Matthijs to make sure that
they do not have an influence.

The strange thing is that the panel driver module is not even loaded
during probe time, although we have defined the display alias and not
changed that compared to 4.19.

The other strange thing is that I can manually modprobe the driver
and it is loaded and shown by lsmod, but the probe function is never
called.

Any hints what we should check and compare and verify?

Did the panel driver compatible matching mechanism change for dsi panels
without a bus (dpi panels are usually loaded as an spi bus client)?

Or is there a new CONFIG that must be set?

BR and thanks,
Nikolaus