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drivers: video: Add SMH option for video buffer

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This commit enables the user to choose whether to
allocate the video buffer from the video heap pool
or use a memory region with specific extra capabilities,
such as being cacheable/non-cacheable or using external
memory.

Signed-off-by: Lucas Tamborrino <lucas.tamborrino@espressif.com>
This commit is contained in:
Lucas Tamborrino 2024-08-13 10:36:12 -03:00 • committed by Anas Nashif
commit 43cc36f4bc
2 changed files with 29 additions and 5 deletions
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15
drivers/video/Kconfig
View file

@ -35,6 +35,21 @@ config VIDEO_BUFFER_POOL_ALIGN
int "Alignment of the video pool’s buffer"
default 64
config VIDEO_BUFFER_USE_SHARED_MULTI_HEAP
bool "Use shared multi heap for video buffer"
default n
config VIDEO_BUFFER_SMH_ATTRIBUTE
int "Shared multi heap attribute for video buffer"
depends on VIDEO_BUFFER_USE_SHARED_MULTI_HEAP
default 0
range 0 2
help
Shared multi heap attribute for video buffer:
0: SMH_REG_ATTR_CACHEABLE
1: SMH_REG_ATTR_NON_CACHEABLE
2: SMH_REG_ATTR_EXTERNAL
source "drivers/video/Kconfig.esp32_dvp"
source "drivers/video/Kconfig.mcux_csi"

19
drivers/video/video_common.c
View file

@ -7,9 +7,18 @@
#include <zephyr/kernel.h>
#include <zephyr/drivers/video.h>
K_HEAP_DEFINE(video_buffer_pool,
CONFIG_VIDEO_BUFFER_POOL_SZ_MAX *
CONFIG_VIDEO_BUFFER_POOL_NUM_MAX);
#if defined(CONFIG_VIDEO_BUFFER_USE_SHARED_MULTI_HEAP)
#include <zephyr/multi_heap/shared_multi_heap.h>
#define VIDEO_COMMON_HEAP_ALLOC(align, size, timeout) \
shared_multi_heap_aligned_alloc(CONFIG_VIDEO_BUFFER_SMH_ATTRIBUTE, align, size)
#define VIDEO_COMMON_FREE(block) shared_multi_heap_free(block)
#else
K_HEAP_DEFINE(video_buffer_pool, CONFIG_VIDEO_BUFFER_POOL_SZ_MAX*CONFIG_VIDEO_BUFFER_POOL_NUM_MAX);
#define VIDEO_COMMON_HEAP_ALLOC(align, size, timeout) \
k_heap_aligned_alloc(&video_buffer_pool, align, size, timeout);
#define VIDEO_COMMON_FREE(block) k_heap_free(&video_buffer_pool, block)
#endif
static struct video_buffer video_buf[CONFIG_VIDEO_BUFFER_POOL_NUM_MAX];
@ -39,7 +48,7 @@ struct video_buffer *video_buffer_aligned_alloc(size_t size, size_t align)
}
/* Alloc buffer memory */
block->data = k_heap_aligned_alloc(&video_buffer_pool, align, size, K_FOREVER);
block->data = VIDEO_COMMON_HEAP_ALLOC(align, size, K_FOREVER);
if (block->data == NULL) {
return NULL;
}
@ -71,6 +80,6 @@ void video_buffer_release(struct video_buffer *vbuf)
vbuf->buffer = NULL;
if (block) {
k_heap_free(&video_buffer_pool, block->data);
VIDEO_COMMON_FREE(block->data);
}
}