lvgl: Set resolution prior to buffer

It fixes an issue where the fbdev driver fails to set up a buffer due to
buffer size mismatch. It happens when the actual screen resolution is
smaller than the default one 800x480 because the actual resolution was
being set after lv_display_set_buffers.

Signed-off-by: Jaeyoon Jung <jaeyoon.jung@lge.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

3 files changed, 31 insertions, 0 deletions

diff --git a/meta-oe/recipes-graphics/lvgl/files/0008-fix-fbdev-set-resolution-prior-to-buffer.patch b/meta-oe/recipes-graphics/lvgl/files/0008-fix-fbdev-set-resolution-prior-to-buffer.patch
new file mode 100644
index 0000000000..449db53dfb
--- /dev/null
+++ b/meta-oe/recipes-graphics/lvgl/files/0008-fix-fbdev-set-resolution-prior-to-buffer.patch
@@ -0,0 +1,29 @@
+From a6f822f75b3ba01b00c028608c93160d09a6ffd1 Mon Sep 17 00:00:00 2001
+From: Jaeyoon Jung <jaeyoon.jung@lge.com>
+Date: Mon, 1 Apr 2024 18:00:39 +0900
+Subject: [PATCH] fix(fbdev): set resolution prior to buffer
+
+Otherwise it ends up with using the default value 800x480 and may fail
+at lv_display_set_buffers due to incorrect resolution.
+
+Upstream-Status: Submitted [https://github.com/lvgl/lvgl/pull/6004]
+Signed-off-by: Jaeyoon Jung <jaeyoon.jung@lge.com>
+---
+
+ src/drivers/display/fb/lv_linux_fbdev.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/drivers/display/fb/lv_linux_fbdev.c b/src/drivers/display/fb/lv_linux_fbdev.c
+index b3cc89199..5fb4c5c9f 100644
+--- a/src/drivers/display/fb/lv_linux_fbdev.c
++++ b/src/drivers/display/fb/lv_linux_fbdev.c
+@@ -233,8 +233,8 @@ void lv_linux_fbdev_set_file(lv_display_t * disp, const char * file)
+         draw_buf_2 = malloc(draw_buf_size);
+     }
+ 
+-    lv_display_set_buffers(disp, draw_buf, draw_buf_2, draw_buf_size, LV_LINUX_FBDEV_RENDER_MODE);
+     lv_display_set_resolution(disp, hor_res, ver_res);
++    lv_display_set_buffers(disp, draw_buf, draw_buf_2, draw_buf_size, LV_LINUX_FBDEV_RENDER_MODE);
+ 
+     if(width > 0) {
+         lv_display_set_dpi(disp, DIV_ROUND_UP(hor_res * 254, width * 10));
diff --git a/meta-oe/recipes-graphics/lvgl/lvgl-demo-fb_9.1.0.bb b/meta-oe/recipes-graphics/lvgl/lvgl-demo-fb_9.1.0.bb
index 3fc3f92860..6e8371baad 100644
--- a/meta-oe/recipes-graphics/lvgl/lvgl-demo-fb_9.1.0.bb
+++ b/meta-oe/recipes-graphics/lvgl/lvgl-demo-fb_9.1.0.bb
@@ -13,6 +13,7 @@ SRC_URI = "\
         file://0005-Add-DRM-KMS-example-support.patch \
         file://0006-Add-SDL2-example-support.patch \
         file://0007-fix-cmake-generate-versioned-shared-libraries.patch;patchdir=lvgl \
+        file://0008-fix-fbdev-set-resolution-prior-to-buffer.patch;patchdir=lvgl \
         "
 SRCREV_demo = "dccc6a1ca48372aa993dbea7a8e17dec6f42df6a"
 SRCREV_lvgl = "e1c0b21b2723d391b885de4b2ee5cc997eccca91"
diff --git a/meta-oe/recipes-graphics/lvgl/lvgl_9.1.0.bb b/meta-oe/recipes-graphics/lvgl/lvgl_9.1.0.bb
index 0ebd6ec422..4435c40777 100644
--- a/meta-oe/recipes-graphics/lvgl/lvgl_9.1.0.bb
+++ b/meta-oe/recipes-graphics/lvgl/lvgl_9.1.0.bb
@@ -12,6 +12,7 @@ SRC_URI = "\
         git://github.com/lvgl/lvgl;protocol=https;branch=master \
         file://0002-fix-sdl-handle-both-LV_IMAGE_SRC_FILE-and-LV_IMAGE_S.patch \
         file://0007-fix-cmake-generate-versioned-shared-libraries.patch \
+        file://0008-fix-fbdev-set-resolution-prior-to-buffer.patch \
         "
 SRCREV = "e1c0b21b2723d391b885de4b2ee5cc997eccca91"