> Am 01.12.2020 um 17:44 schrieb Andreas Kemnade <andr...@kemnade.info>: > > On Tue, 1 Dec 2020 11:10:49 -0500 > Sven Van Asbroeck <thesve...@gmail.com> wrote: > >> Nikolaus, >> >> On Tue, Dec 1, 2020 at 9:38 AM H. Nikolaus Schaller <h...@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? >> > Schematics is here: > https://projects.goldelico.com/p/gta04-main/downloads/48/ > > The display connector P204-LCD indicates some inversion at the XCS and > XRES pins. > > This patch fixes things for a boot where the display was not > touched by the bootloader > diff --git a/arch/arm/boot/dts/omap3-gta04.dtsi > b/arch/arm/boot/dts/omap3-gta04.dtsi > index c8745bc800f7..003202d12990 100644 > --- a/arch/arm/boot/dts/omap3-gta04.dtsi > +++ b/arch/arm/boot/dts/omap3-gta04.dtsi > @@ -124,7 +124,6 @@ > spi-max-frequency = <100000>; > spi-cpol; > spi-cpha; > - spi-cs-high;
BTW: that is what I had planned to try next... > > backlight= <&backlight>; > label = "lcd"; > > So if that one is really active-low, why did it ever work?! > > Regards, > Andreas
