lvgl-demo: add patches for the default Lvgl demo git sources

Signed-off-by: Mike Engel <Mike.Engel@digi.com>

meta-digi-dey/recipes-graphics/lvgl/files/0001-lvgl-demo-remove-demo-slideshow.patch

@@ -0,0 +1,29 @@
+From 1ffdfa2d0d36c566006b5b1f24d2a9e68888a5c1 Mon Sep 17 00:00:00 2001
+From: Mike Engel <Mike.Engel@digi.com>
+Date: Tue, 2 Sep 2025 10:21:07 +0200
+Subject: [PATCH] lvgl-demo: remove demo slideshow
+
+This commit removes the demo slideshow function to
+avoid the application changes automatically between
+the different taps.
+
+Signed-off-by: Mike Engel <Mike.Engel@digi.com>
+---
+ main.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/main.c b/main.c
+index e02cef9..7ec513c 100644
+--- a/main.c
++++ b/main.c
+@@ -48,7 +48,6 @@ int main(void)
+ 
+     /*Create a Demo*/
+     lv_demo_widgets();
+-    lv_demo_widgets_start_slideshow();
+ 
+     /*Handle LVGL tasks*/
+     while(1) {
+-- 
+2.51.0
+

meta-digi-dey/recipes-graphics/lvgl/files/0003-CMakefile-remove-libdrm-dependency-when-building-fbd.patch

@@ -0,0 +1,27 @@
+From 49f99a403e36bb3bb54943d7a351d4aadffe3447 Mon Sep 17 00:00:00 2001
+From: Mike Engel <Mike.Engel@digi.com>
+Date: Wed, 6 Aug 2025 16:59:28 +0200
+Subject: [PATCH] CMakefile: remove libdrm dependency when building fbdev demo
+
+Signed-off-by: Mike Engel <Mike.Engel@digi.com>
+---
+ CMakeLists.txt | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 658193f..c6a2b85 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -12,9 +12,6 @@ target_include_directories(lvgl PUBLIC ${PROJECT_SOURCE_DIR})
+ 
+ add_executable(main main.c mouse_cursor_icon.c)
+ 
+-include(${CMAKE_CURRENT_LIST_DIR}/lvgl/tests/FindLibDRM.cmake)
+-include_directories(${Libdrm_INCLUDE_DIRS})
+-
+ find_package(SDL2)
+ find_package(SDL2_image)
+ include_directories(${SDL2_INCLUDE_DIRS} ${SDL2_IMAGE_INCLUDE_DIRS})
+-- 
+2.34.1
+

meta-digi-dey/recipes-graphics/lvgl/files/lvgl-demo-init

@@ -109,11 +109,15 @@ start() {
 case "$1" in
 	start)
 		echo -n "Starting ${DEMO_TITLE}: "
+		export LV_LINUX_DRM_CARD="##LVGL_CONFIG_DRM_CARD##"
+		export LV_LINUX_FBDEV_DEVICE="##LVGL_CONFIG_FBDEV_DEVICE##"
 		start
 		echo "done."
 		;;
 	stop)
 		stop
+		unset LV_LINUX_DRM_CARD="##LVGL_CONFIG_DRM_CARD##"
+		unset LV_LINUX_FBDEV_DEVICE="##LVGL_CONFIG_FBDEV_DEVICE##"
 		echo -n "Stopping ${DEMO_TITLE}: "
 		if [ -n "`/bin/pidof ${DEMO_PATH}`" ] ; then
 			echo "FAIL"

meta-digi-dey/recipes-graphics/lvgl/lv-conf.inc

@@ -99,4 +99,7 @@ do_configure:append() {
         \
         -e "s|^([[:space:]]*#define LV_USE_LOTTIE[[:space:]]).*|\1${LVGL_CONFIG_USE_LOTTIE}|" \
         -i "${S}/lv_conf.h"
+    sed -i -e 's,##LVGL_CONFIG_DRM_CARD##,${LVGL_CONFIG_DRM_CARD},g' \
+        -i -e 's,##LVGL_CONFIG_FBDEV_DEVICE##,${LVGL_CONFIG_FBDEV_DEVICE},g' \
+        -i ${WORKDIR}/lvgl-demo-init
 }

meta-digi-dey/recipes-graphics/lvgl/lvgl-demo_9.3.0.bb

@@ -7,10 +7,15 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=802d3d83ae80ef5f343050bf96cce3a4 \
 SRC_URI = "\
 	git://github.com/lvgl/lv_port_linux_frame_buffer.git;protocol=https;branch=release/v9.3;name=demo \
 	git://github.com/lvgl/lvgl;protocol=https;branch=release/v9.3;name=lvgl;subdir=git/lvgl \
+	file://0001-lvgl-demo-remove-demo-slideshow.patch \
 	file://lvgl-demo-init \
 	file://lvgl-demo-init.service \
 "
 
+SRC_URI:append:ccimx6ul += "\
+	file://0003-CMakefile-remove-libdrm-dependency-when-building-fbd.patch \
+"
+
 SRCREV_demo = "d07de027a8eb220f4e20f0e1b8be28729332e9ea"
 SRCREV_lvgl = "c033a98afddd65aaafeebea625382a94020fe4a7"
 SRCREV_FORMAT = "demo_lvgl"
@@ -18,6 +23,7 @@ SRCREV_FORMAT = "demo_lvgl"
 EXTRA_OEMAKE = "DESTDIR=${D}"
 
 LVGL_CONFIG_DRM_CARD ?= "/dev/dri/card0"
+LVGL_CONFIG_FBDEV_DEVICE ?= "/dev/fb0"
 # Change DRM card used for i.MX8-based platforms
 LVGL_CONFIG_DRM_CARD:mx8-generic-bsp = "/dev/dri/card1"
 LVGL_CONFIG_LV_USE_LOG    = "1"