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modules: lvgl: allow usage of zephyr memory-region for mem / vdb

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Allow selection of a custom section for memory-poll and / or VDB
based on zephyr memory-regions.
This takes advantages that zephyr,memory-region automatically have
sections being created, hence allowing to easily indicate into which
memory-region to store data.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
This commit is contained in:
Alain Volmat
2025-09-20 19:31:44 +02:00
committed by Johan Hedberg
parent 00a9905f83
commit c2fe44ee98
3 changed files with 44 additions and 6 deletions
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30
modules/lvgl/Kconfig.memory
View File

@@ -52,6 +52,21 @@ config LV_Z_MEMORY_POOL_CUSTOM_SECTION
memory pool to a custom location, such as tightly coupled or
external memory.
config LV_Z_MEMORY_POOL_ZEPHYR_REGION
bool "Place LVGL memory pool in a Zephyr memory-region"
depends on LV_Z_MEM_POOL_SYS_HEAP
depends on !LV_Z_MEMORY_POOL_CUSTOM_SECTION
help
Place LVGL memory pool in a section, automatically
created from a 'zephyr,memory-region' compatible node,
whose name is specified in LV_Z_MEMORY_POOL_ZEPHYR_REGION_NAME.
config LV_Z_MEMORY_POOL_ZEPHYR_REGION_NAME
string "Name of the zephyr memory-region for memory pool"
depends on LV_Z_MEMORY_POOL_ZEPHYR_REGION
help
Name of the Zephyr memory-region where LVGL memory pool is placed.
config LV_Z_VDB_SIZE
int "Rendering buffer size"
default 100 if LV_Z_FULL_REFRESH
@@ -92,6 +107,21 @@ config LV_Z_VDB_CUSTOM_SECTION
rendering buffers to a custom location, such as tightly coupled or
external memory.
config LV_Z_VDB_ZEPHYR_REGION
bool "Place LVGL rendering buffers in a Zephyr memory-region"
depends on LV_Z_BUFFER_ALLOC_STATIC
depends on !LV_Z_VDB_CUSTOM_SECTION
help
Place LVGL rendering buffers in a section, automatically
created from a 'zephyr,memory-region' compatible node,
whose name is specified in LV_Z_VDB_ZEPHYR_REGION_NAME.
config LV_Z_VDB_ZEPHYR_REGION_NAME
string "Name of the Zephyr memory-region for rendering buffers"
depends on LV_Z_VDB_ZEPHYR_REGION
help
Name of the Zephyr memory-region where LVGL rendering buffers are placed.
config LV_Z_MONOCHROME_CONVERSION_BUFFER
bool "Use intermediate conversion buffer for monochrome displays"
default y

17
modules/lvgl/lvgl.c
View File

@@ -78,22 +78,27 @@ static uint8_t *mono_vtile_buf_p[DT_ZEPHYR_DISPLAYS_COUNT] = {NULL};
/* uint16_t * or uint32_t *, therefore buffer needs to be aligned accordingly to */
/* prevent unaligned memory accesses. */
#if defined(CONFIG_LV_Z_VDB_CUSTOM_SECTION)
#define LV_BUF_SECTION Z_GENERIC_SECTION(.lvgl_buf)
#elif defined(CONFIG_LV_Z_VDB_ZEPHYR_REGION)
#define LV_BUF_SECTION Z_GENERIC_SECTION(CONFIG_LV_Z_VDB_ZEPHYR_REGION_NAME)
#else
#define LV_BUF_SECTION
#endif
/* clang-format off */
#define LV_BUFFERS_DEFINE(n) \
static DISPLAY_BUFFER_ALIGN(LV_DRAW_BUF_ALIGN) uint8_t buf0_##n[BUFFER_SIZE(n)] \
IF_ENABLED(CONFIG_LV_Z_VDB_CUSTOM_SECTION, (Z_GENERIC_SECTION(.lvgl_buf))) \
__aligned(CONFIG_LV_Z_VDB_ALIGN); \
LV_BUF_SECTION __aligned(CONFIG_LV_Z_VDB_ALIGN); \
\
IF_ENABLED(CONFIG_LV_Z_DOUBLE_VDB, ( \
static DISPLAY_BUFFER_ALIGN(LV_DRAW_BUF_ALIGN) uint8_t buf1_##n[BUFFER_SIZE(n)] \
IF_ENABLED(CONFIG_LV_Z_VDB_CUSTOM_SECTION, (Z_GENERIC_SECTION(.lvgl_buf))) \
__aligned(CONFIG_LV_Z_VDB_ALIGN); \
LV_BUF_SECTION __aligned(CONFIG_LV_Z_VDB_ALIGN); \
)) \
\
IF_ENABLED(ALLOC_MONOCHROME_CONV_BUFFER, ( \
static uint8_t mono_vtile_buf_##n[BUFFER_SIZE(n)] \
IF_ENABLED(CONFIG_LV_Z_VDB_CUSTOM_SECTION, (Z_GENERIC_SECTION(.lvgl_buf))) \
__aligned(CONFIG_LV_Z_VDB_ALIGN); \
LV_BUF_SECTION __aligned(CONFIG_LV_Z_VDB_ALIGN); \
))
FOR_EACH(LV_BUFFERS_DEFINE, (), LV_DISPLAYS_IDX_LIST);

3
modules/lvgl/lvgl_mem.c
View File

@@ -15,6 +15,9 @@ LOG_MODULE_DECLARE(lvgl, CONFIG_LV_Z_LOG_LEVEL);
#ifdef CONFIG_LV_Z_MEMORY_POOL_CUSTOM_SECTION
#define HEAP_MEM_ATTRIBUTES Z_GENERIC_SECTION(.lvgl_heap) __aligned(8)
#elif defined(CONFIG_LV_Z_MEMORY_POOL_ZEPHYR_REGION)
#define HEAP_MEM_ATTRIBUTES Z_GENERIC_SECTION(CONFIG_LV_Z_MEMORY_POOL_ZEPHYR_REGION_NAME)
__aligned(8)
#else
#define HEAP_MEM_ATTRIBUTES __aligned(8)
#endif /* CONFIG_LV_Z_MEMORY_POOL_CUSTOM_SECTION */