media: v4l2-isp: Add helpers for stats buffer

Add two helper functions to v4l2-isp to handle statistics:

- v4l2_isp_stats_init_buffer() to initialize a statistics buffer
- v4l2_isp_stats_init_block() to initialize a statistics block in the
  next available memory location of a buffer

The v4l2_isp_stats_init_buffer() resets the data size counter of the
buffer and initializes its 'version' field.

The v4l2_isp_stats_init_block() helper accepts the type of the stats
block about to be populated, an array of per-block-type information and
the maximum size of the v4l2-isp buffer. If enough space for the new
block is available, the function increments the
v4l2_isp_buffer.data_size counter, initializes the new stats block
header and returns a pointer to the block for the driver to populate it.

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

0 files changed, 0 insertions, 0 deletions