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media: hevc: add bounded tile-count helpers

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The stateless HEVC decoders compute the number of tile columns and rows
from num_tile_columns_minus1 / num_tile_rows_minus1 and clamp it to the
column_width_minus1[] / row_height_minus1[] capacity before using it as a
loop bound. Add shared helpers in a new <media/v4l2-hevc.h> so the rkvdec
and hantro drivers do not each open-code the min_t() clamp.

Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Assisted-by: Claude:claude-opus-4-8
Fixes: 256fa39208 ("media: v4l: Add definitions for HEVC stateless decoding")
Cc: stable@vger.kernel.org
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Michael Bommarito 2026-06-16 22:19:00 -04:00 committed by Hans Verkuil
parent 439058ced6
commit 592dd4f844
1 changed files with 41 additions and 0 deletions
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41
include/media/v4l2-hevc.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Helper functions for HEVC stateless codecs.
*/
#ifndef _MEDIA_V4L2_HEVC_H
#define _MEDIA_V4L2_HEVC_H
#include <linux/minmax.h>
#include <media/v4l2-ctrls.h>
/**
* v4l2_hevc_pps_num_tile_columns - number of HEVC tile columns, bounded
* @pps: the V4L2 HEVC PPS control
*
* Return the number of tile columns (num_tile_columns_minus1 + 1) clamped to
* the capacity of column_width_minus1[]. The control validation already
* rejects out-of-range counts; this keeps the consuming drivers bounded too.
*/
static inline unsigned int
v4l2_hevc_pps_num_tile_columns(const struct v4l2_ctrl_hevc_pps *pps)
{
return min_t(unsigned int, pps->num_tile_columns_minus1 + 1,
ARRAY_SIZE(pps->column_width_minus1));
}
/**
* v4l2_hevc_pps_num_tile_rows - number of HEVC tile rows, bounded
* @pps: the V4L2 HEVC PPS control
*
* Return the number of tile rows (num_tile_rows_minus1 + 1) clamped to the
* capacity of row_height_minus1[].
*/
static inline unsigned int
v4l2_hevc_pps_num_tile_rows(const struct v4l2_ctrl_hevc_pps *pps)
{
return min_t(unsigned int, pps->num_tile_rows_minus1 + 1,
ARRAY_SIZE(pps->row_height_minus1));
}
#endif /* _MEDIA_V4L2_HEVC_H */