[Letux-kernel] [BUG] SPI broken for SPI based panel drivers

[Sven Van Asbroeck]

Nikolaus,

On Tue, Dec 1, 2020 at 9:38 AM H. Nikolaus Schaller <hns at goldelico.com> wrote:
>
> Let's work on a fix for the fix now.
>

Are you quite sure the chip-select of the tpo,td028ttec1 panel
is active-high? A quick google produced a datasheet which
seems to indicate that XCS is active-low?

See page 17 here:
http://www.lcd-source.com/datasheet/TPO/TD028TTEC1.pdf

It is of course possible that you are driving that line behind
some inverting circuitry. Hardware designers seem to do that
all the time, if they need to go from one voltage domain to
the other, etc.