target/linux/bcm27xx/patches-5.4/950-0978-Update-hy28b-overlay.dts.patch

   1 From 8c997be099769362cb201d360ad57b639e799e9e Mon Sep 17 00:00:00 2001
   2 From: newbloke82 <39644602+newbloke82@users.noreply.github.com>
   3 Date: Thu, 1 Oct 2020 19:16:35 +0200
   4 Subject: [PATCH] Update hy28b-overlay.dts
   5
   6 My hy28b TFT stopped working on upgrade to 5.4 kernel.  I had a whitescreen but no obvious errors when using 'sudo vcdbg log msg' or 'dmesg'.  Both /dev/fb0 and /dev/fb1 were present.  Followed this article on waveshare32b that 'reset_gpios needed to be 0 0 1 instead of 0 0 0' (https://forum.armbian.com/topic/13233-any-clues-for-the-creation-of-a-dtoverlay-for-fbtft-on-54y/).  I applied a similar change to this dts file and compiled a new dtbo: 'dtc -O dtb -o hy28b.dtbo hy28b-overlay.dts'.  Fixed my issue - may help others?  I got from the 5.4 upgrade thread that other tft users are having issues with small tfts... https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=269769&p=1706597&hilit=gpio#p1706597
   7 ---
   8  arch/arm/boot/dts/overlays/hy28b-overlay.dts | 2 +-
   9  1 file changed, 1 insertion(+), 1 deletion(-)
  10
  11 --- a/arch/arm/boot/dts/overlays/hy28b-overlay.dts
  12 +++ b/arch/arm/boot/dts/overlays/hy28b-overlay.dts
  13 @@ -61,7 +61,7 @@
  14                                 fps = <50>;
  15                                 buswidth = <8>;
  16                                 startbyte = <0x70>;
  17 -                               reset-gpios = <&gpio 25 0>;
  18 +                               reset-gpios = <&gpio 25 1>;
  19                                 led-gpios = <&gpio 18 1>;
  20
  21                                 gamma = "04 1F 4 7 7 0 7 7 6 0\n0F 00 1 7 4 0 0 0 6 7";