[linux-2.6-block.git] / drivers / gpu / drm / drm_fourcc.c

/*
 * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *
 * DRM core format related functions
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <linux/bug.h>
#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/kernel.h>

#include <drm/drmP.h>
#include <drm/drm_fourcc.h>

static char printable_char(int c)
{
	return isascii(c) && isprint(c) ? c : '?';
}

/**
 * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
 * @bpp: bits per pixels
 * @depth: bit depth per pixel
 *
 * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
 * Useful in fbdev emulation code, since that deals in those values.
 */
uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
{
	uint32_t fmt = DRM_FORMAT_INVALID;

	switch (bpp) {
	case 8:
		if (depth == 8)
			fmt = DRM_FORMAT_C8;
		break;

	case 16:
		switch (depth) {
		case 15:
			fmt = DRM_FORMAT_XRGB1555;
			break;
		case 16:
			fmt = DRM_FORMAT_RGB565;
			break;
		default:
			break;
		}
		break;

	case 24:
		if (depth == 24)
			fmt = DRM_FORMAT_RGB888;
		break;

	case 32:
		switch (depth) {
		case 24:
			fmt = DRM_FORMAT_XRGB8888;
			break;
		case 30:
			fmt = DRM_FORMAT_XRGB2101010;
			break;
		case 32:
			fmt = DRM_FORMAT_ARGB8888;
			break;
		default:
			break;
		}
		break;

	default:
		break;
	}

	return fmt;
}
EXPORT_SYMBOL(drm_mode_legacy_fb_format);

/**
 * drm_driver_legacy_fb_format - compute drm fourcc code from legacy description
 * @dev: DRM device
 * @bpp: bits per pixels
 * @depth: bit depth per pixel
 *
 * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
 * Unlike drm_mode_legacy_fb_format() this looks at the drivers mode_config,
 * and depending on the quirk_addfb_prefer_host_byte_order flag it returns
 * little endian byte order or host byte order framebuffer formats.
 */
uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
				     uint32_t bpp, uint32_t depth)
{
	uint32_t fmt = drm_mode_legacy_fb_format(bpp, depth);

	if (dev->mode_config.quirk_addfb_prefer_host_byte_order) {
		if (fmt == DRM_FORMAT_XRGB8888)
			fmt = DRM_FORMAT_HOST_XRGB8888;
		if (fmt == DRM_FORMAT_ARGB8888)
			fmt = DRM_FORMAT_HOST_ARGB8888;
		if (fmt == DRM_FORMAT_RGB565)
			fmt = DRM_FORMAT_HOST_RGB565;
		if (fmt == DRM_FORMAT_XRGB1555)
			fmt = DRM_FORMAT_HOST_XRGB1555;
	}

	if (dev->mode_config.quirk_addfb_prefer_xbgr_30bpp &&
	    fmt == DRM_FORMAT_XRGB2101010)
		fmt = DRM_FORMAT_XBGR2101010;

	return fmt;
}
EXPORT_SYMBOL(drm_driver_legacy_fb_format);

/**
 * drm_get_format_name - fill a string with a drm fourcc format's name
 * @format: format to compute name of
 * @buf: caller-supplied buffer
 */
const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
{
	snprintf(buf->str, sizeof(buf->str),
		 "%c%c%c%c %s-endian (0x%08x)",
		 printable_char(format & 0xff),
		 printable_char((format >> 8) & 0xff),
		 printable_char((format >> 16) & 0xff),
		 printable_char((format >> 24) & 0x7f),
		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
		 format);

	return buf->str;
}
EXPORT_SYMBOL(drm_get_format_name);

/*
 * Internal function to query information for a given format. See
 * drm_format_info() for the public API.
 */
const struct drm_format_info *__drm_format_info(u32 format)
{
	static const struct drm_format_info formats[] = {
		{ .format = DRM_FORMAT_C8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGB332,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGR233,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XRGB4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XBGR4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGBX4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGRX4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_ARGB4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_ABGR4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGBA4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGRA4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_XRGB1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XBGR1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGBX5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGRX5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_ARGB1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_ABGR1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGBA5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGRA5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGB565,		.depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGR565,		.depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGB888,		.depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGR888,		.depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XRGB8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XBGR8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGBX8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGRX8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGB565_A8,	.depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGR565_A8,	.depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_XRGB2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_XBGR2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_RGBX1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_BGRX1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
		{ .format = DRM_FORMAT_ARGB2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_ABGR2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGBA1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGRA1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_ARGB8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_ABGR8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGBA8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGRA8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGB888_A8,	.depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGR888_A8,	.depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_XRGB8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_XBGR8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_RGBX8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_BGRX8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
		{ .format = DRM_FORMAT_YUV410,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
		{ .format = DRM_FORMAT_YVU410,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
		{ .format = DRM_FORMAT_YUV411,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YVU411,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YUV420,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
		{ .format = DRM_FORMAT_YVU420,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
		{ .format = DRM_FORMAT_YUV422,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YVU422,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YUV444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YVU444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_NV12,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
		{ .format = DRM_FORMAT_NV21,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
		{ .format = DRM_FORMAT_NV16,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_NV61,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_NV24,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_NV42,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YUYV,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_YVYU,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_UYVY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_VYUY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
		{ .format = DRM_FORMAT_AYUV,		.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
	};

	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
		if (formats[i].format == format)
			return &formats[i];
	}

	return NULL;
}

/**
 * drm_format_info - query information for a given format
 * @format: pixel format (DRM_FORMAT_*)
 *
 * The caller should only pass a supported pixel format to this function.
 * Unsupported pixel formats will generate a warning in the kernel log.
 *
 * Returns:
 * The instance of struct drm_format_info that describes the pixel format, or
 * NULL if the format is unsupported.
 */
const struct drm_format_info *drm_format_info(u32 format)
{
	const struct drm_format_info *info;

	info = __drm_format_info(format);
	WARN_ON(!info);
	return info;
}
EXPORT_SYMBOL(drm_format_info);

/**
 * drm_get_format_info - query information for a given framebuffer configuration
 * @dev: DRM device
 * @mode_cmd: metadata from the userspace fb creation request
 *
 * Returns:
 * The instance of struct drm_format_info that describes the pixel format, or
 * NULL if the format is unsupported.
 */
const struct drm_format_info *
drm_get_format_info(struct drm_device *dev,
		    const struct drm_mode_fb_cmd2 *mode_cmd)
{
	const struct drm_format_info *info = NULL;

	if (dev->mode_config.funcs->get_format_info)
		info = dev->mode_config.funcs->get_format_info(mode_cmd);

	if (!info)
		info = drm_format_info(mode_cmd->pixel_format);

	return info;
}
EXPORT_SYMBOL(drm_get_format_info);

/**
 * drm_format_num_planes - get the number of planes for format
 * @format: pixel format (DRM_FORMAT_*)
 *
 * Returns:
 * The number of planes used by the specified pixel format.
 */
int drm_format_num_planes(uint32_t format)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	return info ? info->num_planes : 1;
}
EXPORT_SYMBOL(drm_format_num_planes);

/**
 * drm_format_plane_cpp - determine the bytes per pixel value
 * @format: pixel format (DRM_FORMAT_*)
 * @plane: plane index
 *
 * Returns:
 * The bytes per pixel value for the specified plane.
 */
int drm_format_plane_cpp(uint32_t format, int plane)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	if (!info || plane >= info->num_planes)
		return 0;

	return info->cpp[plane];
}
EXPORT_SYMBOL(drm_format_plane_cpp);

/**
 * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
 * @format: pixel format (DRM_FORMAT_*)
 *
 * Returns:
 * The horizontal chroma subsampling factor for the
 * specified pixel format.
 */
int drm_format_horz_chroma_subsampling(uint32_t format)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	return info ? info->hsub : 1;
}
EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);

/**
 * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
 * @format: pixel format (DRM_FORMAT_*)
 *
 * Returns:
 * The vertical chroma subsampling factor for the
 * specified pixel format.
 */
int drm_format_vert_chroma_subsampling(uint32_t format)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	return info ? info->vsub : 1;
}
EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);

/**
 * drm_format_plane_width - width of the plane given the first plane
 * @width: width of the first plane
 * @format: pixel format
 * @plane: plane index
 *
 * Returns:
 * The width of @plane, given that the width of the first plane is @width.
 */
int drm_format_plane_width(int width, uint32_t format, int plane)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	if (!info || plane >= info->num_planes)
		return 0;

	if (plane == 0)
		return width;

	return width / info->hsub;
}
EXPORT_SYMBOL(drm_format_plane_width);

/**
 * drm_format_plane_height - height of the plane given the first plane
 * @height: height of the first plane
 * @format: pixel format
 * @plane: plane index
 *
 * Returns:
 * The height of @plane, given that the height of the first plane is @height.
 */
int drm_format_plane_height(int height, uint32_t format, int plane)
{
	const struct drm_format_info *info;

	info = drm_format_info(format);
	if (!info || plane >= info->num_planes)
		return 0;

	if (plane == 0)
		return height;

	return height / info->vsub;
}
EXPORT_SYMBOL(drm_format_plane_height);
Commit	Line	Data
ae4df11a LP	1	/*
	2	* Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
	3	*
	4	* DRM core format related functions
	5	*
	6	* Permission to use, copy, modify, distribute, and sell this software and its
	7	* documentation for any purpose is hereby granted without fee, provided that
	8	* the above copyright notice appear in all copies and that both that copyright
	9	* notice and this permission notice appear in supporting documentation, and
	10	* that the name of the copyright holders not be used in advertising or
	11	* publicity pertaining to distribution of the software without specific,
	12	* written prior permission. The copyright holders make no representations
	13	* about the suitability of this software for any purpose. It is provided "as
	14	* is" without express or implied warranty.
	15	*
	16	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	17	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	18	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	19	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	20	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	21	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	22	* OF THIS SOFTWARE.
	23	*/
	24
	25	#include <linux/bug.h>
	26	#include <linux/ctype.h>
	27	#include <linux/export.h>
	28	#include <linux/kernel.h>
	29
	30	#include <drm/drmP.h>
	31	#include <drm/drm_fourcc.h>
	32
	33	static char printable_char(int c)
	34	{
	35	return isascii(c) && isprint(c) ? c : '?';
	36	}
	37
ec5e3047 DV	38	/**
	39	* drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
	40	* @bpp: bits per pixels
	41	* @depth: bit depth per pixel
	42	*
	43	* Computes a drm fourcc pixel format code for the given @bpp/@depth values.
	44	* Useful in fbdev emulation code, since that deals in those values.
	45	*/
	46	uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
	47	{
70109354	48	uint32_t fmt = DRM_FORMAT_INVALID;
ec5e3047 DV	49
	50	switch (bpp) {
	51	case 8:
70109354 CW	52	if (depth == 8)
70109354 CW	53	fmt = DRM_FORMAT_C8;
ec5e3047	54	break;
70109354	55
ec5e3047	56	case 16:
70109354 CW	57	switch (depth) {
70109354 CW	58	case 15:
ec5e3047	59	fmt = DRM_FORMAT_XRGB1555;
70109354 CW	60	break;
70109354 CW	61	case 16:
ec5e3047	62	fmt = DRM_FORMAT_RGB565;
70109354 CW	63	break;
	64	default:
	65	break;
	66	}
ec5e3047	67	break;
70109354	68
ec5e3047	69	case 24:
70109354 CW	70	if (depth == 24)
70109354 CW	71	fmt = DRM_FORMAT_RGB888;
ec5e3047	72	break;
70109354	73
ec5e3047	74	case 32:
70109354 CW	75	switch (depth) {
70109354 CW	76	case 24:
ec5e3047	77	fmt = DRM_FORMAT_XRGB8888;
70109354 CW	78	break;
70109354 CW	79	case 30:
ec5e3047	80	fmt = DRM_FORMAT_XRGB2101010;
70109354 CW	81	break;
70109354 CW	82	case 32:
ec5e3047	83	fmt = DRM_FORMAT_ARGB8888;
70109354 CW	84	break;
	85	default:
	86	break;
	87	}
ec5e3047	88	break;
70109354	89
ec5e3047	90	default:
ec5e3047 DV	91	break;
	92	}
	93
	94	return fmt;
	95	}
	96	EXPORT_SYMBOL(drm_mode_legacy_fb_format);
	97
059b5eb5 GH	98	/**
059b5eb5 GH	99	* drm_driver_legacy_fb_format - compute drm fourcc code from legacy description
cf3d02a1	100	* @dev: DRM device
059b5eb5 GH	101	* @bpp: bits per pixels
059b5eb5 GH	102	* @depth: bit depth per pixel
059b5eb5 GH	103	*
	104	* Computes a drm fourcc pixel format code for the given @bpp/@depth values.
	105	* Unlike drm_mode_legacy_fb_format() this looks at the drivers mode_config,
	106	* and depending on the quirk_addfb_prefer_host_byte_order flag it returns
	107	* little endian byte order or host byte order framebuffer formats.
	108	*/
	109	uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
	110	uint32_t bpp, uint32_t depth)
	111	{
	112	uint32_t fmt = drm_mode_legacy_fb_format(bpp, depth);
	113
	114	if (dev->mode_config.quirk_addfb_prefer_host_byte_order) {
	115	if (fmt == DRM_FORMAT_XRGB8888)
	116	fmt = DRM_FORMAT_HOST_XRGB8888;
	117	if (fmt == DRM_FORMAT_ARGB8888)
	118	fmt = DRM_FORMAT_HOST_ARGB8888;
	119	if (fmt == DRM_FORMAT_RGB565)
	120	fmt = DRM_FORMAT_HOST_RGB565;
	121	if (fmt == DRM_FORMAT_XRGB1555)
	122	fmt = DRM_FORMAT_HOST_XRGB1555;
	123	}
9dd3cb24 GH	124
	125	if (dev->mode_config.quirk_addfb_prefer_xbgr_30bpp &&
	126	fmt == DRM_FORMAT_XRGB2101010)
	127	fmt = DRM_FORMAT_XBGR2101010;
	128
059b5eb5 GH	129	return fmt;
	130	}
	131	EXPORT_SYMBOL(drm_driver_legacy_fb_format);
	132
ae4df11a	133	/**
b3c11ac2	134	* drm_get_format_name - fill a string with a drm fourcc format's name
ae4df11a	135	* @format: format to compute name of
b3c11ac2	136	* @buf: caller-supplied buffer
ae4df11a	137	*/
b3c11ac2	138	const char drm_get_format_name(uint32_t format, struct drm_format_name_buf buf)
ae4df11a	139	{
b3c11ac2	140	snprintf(buf->str, sizeof(buf->str),
ae4df11a LP	141	"%c%c%c%c %s-endian (0x%08x)",
	142	printable_char(format & 0xff),
	143	printable_char((format >> 8) & 0xff),
	144	printable_char((format >> 16) & 0xff),
	145	printable_char((format >> 24) & 0x7f),
	146	format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
	147	format);
	148
b3c11ac2	149	return buf->str;
ae4df11a LP	150	}
	151	EXPORT_SYMBOL(drm_get_format_name);
	152
333d2da5 LP	153	/*
	154	* Internal function to query information for a given format. See
	155	* drm_format_info() for the public API.
84770cc2	156	*/
333d2da5	157	const struct drm_format_info *__drm_format_info(u32 format)
84770cc2 LP	158	{
	159	static const struct drm_format_info formats[] = {
	160	{ .format = DRM_FORMAT_C8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
	161	{ .format = DRM_FORMAT_RGB332, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
	162	{ .format = DRM_FORMAT_BGR233, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
	163	{ .format = DRM_FORMAT_XRGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	164	{ .format = DRM_FORMAT_XBGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	165	{ .format = DRM_FORMAT_RGBX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	166	{ .format = DRM_FORMAT_BGRX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
4cc4e1b4 MR	167	{ .format = DRM_FORMAT_ARGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	168	{ .format = DRM_FORMAT_ABGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	169	{ .format = DRM_FORMAT_RGBA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	170	{ .format = DRM_FORMAT_BGRA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
84770cc2 LP	171	{ .format = DRM_FORMAT_XRGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	172	{ .format = DRM_FORMAT_XBGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	173	{ .format = DRM_FORMAT_RGBX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	174	{ .format = DRM_FORMAT_BGRX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
4cc4e1b4 MR	175	{ .format = DRM_FORMAT_ARGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	176	{ .format = DRM_FORMAT_ABGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	177	{ .format = DRM_FORMAT_RGBA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	178	{ .format = DRM_FORMAT_BGRA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
84770cc2 LP	179	{ .format = DRM_FORMAT_RGB565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	180	{ .format = DRM_FORMAT_BGR565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
	181	{ .format = DRM_FORMAT_RGB888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
	182	{ .format = DRM_FORMAT_BGR888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
	183	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	184	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	185	{ .format = DRM_FORMAT_RGBX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	186	{ .format = DRM_FORMAT_BGRX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
4cc4e1b4 MR	187	{ .format = DRM_FORMAT_RGB565_A8, .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
4cc4e1b4 MR	188	{ .format = DRM_FORMAT_BGR565_A8, .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
84770cc2 LP	189	{ .format = DRM_FORMAT_XRGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	190	{ .format = DRM_FORMAT_XBGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	191	{ .format = DRM_FORMAT_RGBX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
	192	{ .format = DRM_FORMAT_BGRX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
4cc4e1b4 MR	193	{ .format = DRM_FORMAT_ARGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	194	{ .format = DRM_FORMAT_ABGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	195	{ .format = DRM_FORMAT_RGBA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	196	{ .format = DRM_FORMAT_BGRA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	197	{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	198	{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	199	{ .format = DRM_FORMAT_RGBA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	200	{ .format = DRM_FORMAT_BGRA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	201	{ .format = DRM_FORMAT_RGB888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	202	{ .format = DRM_FORMAT_BGR888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	203	{ .format = DRM_FORMAT_XRGB8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	204	{ .format = DRM_FORMAT_XBGR8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	205	{ .format = DRM_FORMAT_RGBX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
	206	{ .format = DRM_FORMAT_BGRX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
ce2d5461 AKH	207	{ .format = DRM_FORMAT_YUV410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
	208	{ .format = DRM_FORMAT_YVU410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
	209	{ .format = DRM_FORMAT_YUV411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
	210	{ .format = DRM_FORMAT_YVU411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
	211	{ .format = DRM_FORMAT_YUV420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
	212	{ .format = DRM_FORMAT_YVU420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
	213	{ .format = DRM_FORMAT_YUV422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	214	{ .format = DRM_FORMAT_YVU422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	215	{ .format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
	216	{ .format = DRM_FORMAT_YVU444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
	217	{ .format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
	218	{ .format = DRM_FORMAT_NV21, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
	219	{ .format = DRM_FORMAT_NV16, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	220	{ .format = DRM_FORMAT_NV61, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	221	{ .format = DRM_FORMAT_NV24, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
	222	{ .format = DRM_FORMAT_NV42, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
	223	{ .format = DRM_FORMAT_YUYV, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	224	{ .format = DRM_FORMAT_YVYU, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	225	{ .format = DRM_FORMAT_UYVY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	226	{ .format = DRM_FORMAT_VYUY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
	227	{ .format = DRM_FORMAT_AYUV, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
84770cc2 LP	228	};
	229
	230	unsigned int i;
	231
	232	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
	233	if (formats[i].format == format)
	234	return &formats[i];
	235	}
	236
	237	return NULL;
	238	}
333d2da5 LP	239
	240	/**
	241	* drm_format_info - query information for a given format
	242	* @format: pixel format (DRM_FORMAT_*)
	243	*
	244	* The caller should only pass a supported pixel format to this function.
	245	* Unsupported pixel formats will generate a warning in the kernel log.
	246	*
	247	* Returns:
	248	* The instance of struct drm_format_info that describes the pixel format, or
	249	* NULL if the format is unsupported.
	250	*/
	251	const struct drm_format_info *drm_format_info(u32 format)
	252	{
	253	const struct drm_format_info *info;
	254
	255	info = __drm_format_info(format);
	256	WARN_ON(!info);
	257	return info;
	258	}
84770cc2 LP	259	EXPORT_SYMBOL(drm_format_info);
84770cc2 LP	260
6a0f9ebf VS	261	/**
	262	* drm_get_format_info - query information for a given framebuffer configuration
	263	* @dev: DRM device
	264	* @mode_cmd: metadata from the userspace fb creation request
	265	*
	266	* Returns:
	267	* The instance of struct drm_format_info that describes the pixel format, or
	268	* NULL if the format is unsupported.
	269	*/
	270	const struct drm_format_info *
	271	drm_get_format_info(struct drm_device *dev,
	272	const struct drm_mode_fb_cmd2 *mode_cmd)
	273	{
	274	const struct drm_format_info *info = NULL;
	275
	276	if (dev->mode_config.funcs->get_format_info)
	277	info = dev->mode_config.funcs->get_format_info(mode_cmd);
	278
	279	if (!info)
	280	info = drm_format_info(mode_cmd->pixel_format);
	281
	282	return info;
	283	}
	284	EXPORT_SYMBOL(drm_get_format_info);
	285
ae4df11a LP	286	/**
	287	* drm_format_num_planes - get the number of planes for format
	288	* @format: pixel format (DRM_FORMAT_*)
	289	*
	290	* Returns:
	291	* The number of planes used by the specified pixel format.
	292	*/
	293	int drm_format_num_planes(uint32_t format)
	294	{
86c238aa LP	295	const struct drm_format_info *info;
	296
	297	info = drm_format_info(format);
	298	return info ? info->num_planes : 1;
ae4df11a LP	299	}
	300	EXPORT_SYMBOL(drm_format_num_planes);
	301
	302	/**
	303	* drm_format_plane_cpp - determine the bytes per pixel value
	304	* @format: pixel format (DRM_FORMAT_*)
	305	* @plane: plane index
	306	*
	307	* Returns:
	308	* The bytes per pixel value for the specified plane.
	309	*/
	310	int drm_format_plane_cpp(uint32_t format, int plane)
	311	{
86c238aa	312	const struct drm_format_info *info;
ae4df11a	313
86c238aa LP	314	info = drm_format_info(format);
86c238aa LP	315	if (!info \|\| plane >= info->num_planes)
ae4df11a LP	316	return 0;
ae4df11a LP	317
86c238aa	318	return info->cpp[plane];
ae4df11a LP	319	}
	320	EXPORT_SYMBOL(drm_format_plane_cpp);
	321
	322	/**
	323	* drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
	324	* @format: pixel format (DRM_FORMAT_*)
	325	*
	326	* Returns:
	327	* The horizontal chroma subsampling factor for the
	328	* specified pixel format.
	329	*/
	330	int drm_format_horz_chroma_subsampling(uint32_t format)
	331	{
86c238aa LP	332	const struct drm_format_info *info;
	333
	334	info = drm_format_info(format);
	335	return info ? info->hsub : 1;
ae4df11a LP	336	}
	337	EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
	338
	339	/**
	340	* drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
	341	* @format: pixel format (DRM_FORMAT_*)
	342	*
	343	* Returns:
	344	* The vertical chroma subsampling factor for the
	345	* specified pixel format.
	346	*/
	347	int drm_format_vert_chroma_subsampling(uint32_t format)
	348	{
86c238aa LP	349	const struct drm_format_info *info;
	350
	351	info = drm_format_info(format);
	352	return info ? info->vsub : 1;
ae4df11a LP	353	}
	354	EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
	355
	356	/**
	357	* drm_format_plane_width - width of the plane given the first plane
	358	* @width: width of the first plane
	359	* @format: pixel format
	360	* @plane: plane index
	361	*
	362	* Returns:
	363	* The width of @plane, given that the width of the first plane is @width.
	364	*/
	365	int drm_format_plane_width(int width, uint32_t format, int plane)
	366	{
86c238aa LP	367	const struct drm_format_info *info;
	368
	369	info = drm_format_info(format);
	370	if (!info \|\| plane >= info->num_planes)
ae4df11a LP	371	return 0;
	372
	373	if (plane == 0)
	374	return width;
	375
86c238aa	376	return width / info->hsub;
ae4df11a LP	377	}
	378	EXPORT_SYMBOL(drm_format_plane_width);
	379
	380	/**
	381	* drm_format_plane_height - height of the plane given the first plane
	382	* @height: height of the first plane
	383	* @format: pixel format
	384	* @plane: plane index
	385	*
	386	* Returns:
	387	* The height of @plane, given that the height of the first plane is @height.
	388	*/
	389	int drm_format_plane_height(int height, uint32_t format, int plane)
	390	{
86c238aa LP	391	const struct drm_format_info *info;
	392
	393	info = drm_format_info(format);
	394	if (!info \|\| plane >= info->num_planes)
ae4df11a LP	395	return 0;
	396
	397	if (plane == 0)
	398	return height;
	399
86c238aa	400	return height / info->vsub;
ae4df11a LP	401	}
ae4df11a LP	402	EXPORT_SYMBOL(drm_format_plane_height);