modules: lvgl: simplify sys_heap memory size configs

Changes the Kconfig symbols for the sys_heap based memory management option
and removes the notion of `BLOCKS` with a more concise single
`LV_Z_MEM_POOL_SIZE` option. Also adds `LV_MEM_CUSTOM` to the lv_conf.h,
since in any option the memory management is considered to be custom.

Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>

modules/lvgl/Kconfig.memory

@@ -31,27 +31,12 @@ choice LV_Z_MEMORY_POOL
 
 endchoice
 
-if LV_Z_MEM_POOL_SYS_HEAP
-
-config LV_Z_MEM_POOL_MIN_SIZE
-	int "Minimum memory pool block size"
-	default 16
-	help
-	  Size of the smallest block in the memory pool in bytes
-
-config LV_Z_MEM_POOL_MAX_SIZE
-	int "Maximum memory pool block size"
+config LV_Z_MEM_POOL_SIZE
+	int "Memory pool size"
 	default 2048
+	depends on LV_Z_MEM_POOL_SYS_HEAP
 	help
-	  Size of the largest block in the memory pool in bytes
-
-config LV_Z_MEM_POOL_NUMBER_BLOCKS
-	int "Number of max size blocks in memory pool"
-	default 1
-	help
-	  Number of maximum sized blocks in the memory pool.
-
-endif
+	  Size of the memory pool in bytes
 
 config LV_Z_VDB_SIZE
 	int "Rendering buffer size"

modules/lvgl/include/lv_conf.h

@@ -11,6 +11,7 @@
 /* Memory manager settings */
 
 #define LV_MEMCPY_MEMSET_STD 1
+#define LV_MEM_CUSTOM        1
 
 #if defined(CONFIG_LV_Z_MEM_POOL_HEAP_LIB_C)
 

modules/lvgl/lvgl_mem.c

@@ -10,9 +10,7 @@
 #include <zephyr/init.h>
 #include <zephyr/sys/sys_heap.h>
 
-#define HEAP_BYTES (CONFIG_LV_Z_MEM_POOL_MAX_SIZE * CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS)
-
-static char lvgl_heap_mem[HEAP_BYTES] __aligned(8);
+static char lvgl_heap_mem[CONFIG_LV_Z_MEM_POOL_SIZE] __aligned(8);
 static struct sys_heap lvgl_heap;
 static struct k_spinlock lvgl_heap_lock;
 
@@ -60,5 +58,5 @@ void lvgl_print_heap_info(bool dump_chunks)
 
 void lvgl_heap_init(void)
 {
-	sys_heap_init(&lvgl_heap, &lvgl_heap_mem[0], HEAP_BYTES);
+	sys_heap_init(&lvgl_heap, &lvgl_heap_mem[0], CONFIG_LV_Z_MEM_POOL_SIZE);
 }

samples/modules/lvgl/demos/prj.conf

@@ -3,7 +3,7 @@ CONFIG_LOG=y
 CONFIG_SHELL=y
 
 CONFIG_LVGL=y
-CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS=8
+CONFIG_LV_Z_MEM_POOL_SIZE=16384
 CONFIG_LV_Z_SHELL=y
 CONFIG_LV_USE_MONKEY=y
 

samples/subsys/display/lvgl/prj.conf

@@ -1,4 +1,4 @@
-CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS=8
+CONFIG_LV_Z_MEM_POOL_SIZE=16384
 CONFIG_LV_Z_SHELL=y
 CONFIG_MAIN_STACK_SIZE=2048
 

tests/lib/gui/lvgl/prj.conf

@@ -13,7 +13,7 @@ CONFIG_FILE_SYSTEM=y
 CONFIG_FILE_SYSTEM_LITTLEFS=y
 
 CONFIG_LVGL=y
-CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS=8
+CONFIG_LV_Z_MEM_POOL_SIZE=16384
 CONFIG_LV_Z_USE_FILESYSTEM=y
 CONFIG_LV_MEM_CUSTOM=y
 CONFIG_LV_USE_LOG=y

tests/lib/gui/lvgl/testcase.yaml

@@ -22,8 +22,7 @@ tests:
     extra_configs:
       - CONFIG_LV_Z_BUFFER_ALLOC_DYNAMIC=y
       - CONFIG_LV_Z_MEM_POOL_SYS_HEAP=y
-      - CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS=3
-      - CONFIG_LV_Z_MEM_POOL_MAX_SIZE=32768
+      - CONFIG_LV_Z_MEM_POOL_SIZE=98304
   libraries.gui.lvgl.16bit:
     tags:
       - display