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; backlight= <&backlight>; label = "lcd"; So if that one is really active-low, why did it ever work?! Regards, Andreas
