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drm/fourcc: Add drm_format_info_bpp() helper

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Add a helper to retrieve the actual number of bits per pixel for a
plane, taking into account the number of characters and pixels per
block for tiled formats.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1cae5ebc28513ec1c91c66b00647ce3ca23bfba7.1657294931.git.geert@linux-m68k.org
This commit is contained in:
Geert Uytterhoeven 2022-07-08 20:20:46 +02:00 committed by Sam Ravnborg
parent 79abca2b39
commit 96dc635d55
2 changed files with 20 additions and 0 deletions
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19
drivers/gpu/drm/drm_fourcc.c
View File

@ -370,6 +370,25 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
}
EXPORT_SYMBOL(drm_format_info_block_height);
/**
* drm_format_info_bpp - number of bits per pixel
* @info: pixel format info
* @plane: plane index
*
* Returns:
* The actual number of bits per pixel, depending on the plane index.
*/
unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane)
{
if (!info || plane < 0 || plane >= info->num_planes)
return 0;
return info->char_per_block[plane] * 8 /
(drm_format_info_block_width(info, plane) *
drm_format_info_block_height(info, plane));
}
EXPORT_SYMBOL(drm_format_info_bpp);
/**
* drm_format_info_min_pitch - computes the minimum required pitch in bytes
* @info: pixel format info

1
include/drm/drm_fourcc.h
View File

@ -313,6 +313,7 @@ unsigned int drm_format_info_block_width(const struct drm_format_info *info,
int plane);
unsigned int drm_format_info_block_height(const struct drm_format_info *info,
int plane);
unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane);
uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
int plane, unsigned int buffer_width);