linux-imx

/*

 * 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;