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media: core: Report the maximum possible number of buffers for the queue

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Use one of the struct v4l2_create_buffers reserved bytes to report
the maximum possible number of buffers for the queue.
V4l2 framework set V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS flags in queue
capabilities so userland can know when the field is valid.
Does the same change in v4l2_create_buffers32 structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Benjamin Gaignard
2023-11-09 17:35:00 +01:00
committed by Mauro Carvalho Chehab
parent c838530d23
commit d055a76c00
6 changed files with 26 additions and 6 deletions
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include/uapi/linux/videodev2.h
+6 -1
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@@ -1035,6 +1035,7 @@ struct v4l2_requestbuffers {
#define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS (1 << 4)
#define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5)
#define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS (1 << 6)
#define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS (1 << 7)
/**
* struct v4l2_plane - plane info for multi-planar buffers
@@ -2605,6 +2606,9 @@ struct v4l2_dbg_chip_info {
* @flags: additional buffer management attributes (ignored unless the
* queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
* and configured for MMAP streaming I/O).
* @max_num_buffers: if V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set
* this field indicate the maximum possible number of buffers
* for this queue.
* @reserved: future extensions
*/
struct v4l2_create_buffers {
@@ -2614,7 +2618,8 @@ struct v4l2_create_buffers {
struct v4l2_format format;
__u32 capabilities;
__u32 flags;
__u32 reserved[6];
__u32 max_num_buffers;
__u32 reserved[5];
};
/*