Hello Alex,
there is a bug in mipi_dbi_hw_reset() function that implements the logic of display reset contrary.
It keeps the reset line activated which keeps displays in reset state.
I reported the bug to https://gitlab.freedesktop.org/drm/misc/kernel/-/issues/63
Unfortunately, fixing the bug would mean current DTB-ABI breakage and device-trees modification would be needed.
I mainly write this email to let you and other people know about it, so hopefully it can be found easier.
What are your thoughts?
Regards,
Josef Lusticky