Commit 96dc635d authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Sam Ravnborg
Browse files

drm/fourcc: Add drm_format_info_bpp() helper 



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: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1cae5ebc28513ec1c91c66b00647ce3ca23bfba7.1657294931.git.geert@linux-m68k.org
parent 79abca2b

drivers/gpu/drm/drm_fourcc.c

+19 −0
Original line number Original line Diff line number Diff line
@@ -370,6 +370,25 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info, 
}

}

EXPORT_SYMBOL(drm_format_info_block_height);

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

 * drm_format_info_min_pitch - computes the minimum required pitch in bytes

 * @info: pixel format info

 * @info: pixel format info

include/drm/drm_fourcc.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -313,6 +313,7 @@ unsigned int drm_format_info_block_width(const struct drm_format_info *info, 
					 int plane);

					 int plane);

unsigned int drm_format_info_block_height(const struct drm_format_info *info,

unsigned int drm_format_info_block_height(const struct drm_format_info *info,

					  int plane);

					  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,

uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,

				   int plane, unsigned int buffer_width);

				   int plane, unsigned int buffer_width);