linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * drm kms/fb cma (contiguous memory allocator) helper functions

 *

 * Copyright (C) 2012 Analog Device Inc.

 *   Author: Lars-Peter Clausen <lars@metafoo.de>

 *

 * Based on udl_fbdev.c

 *  Copyright (C) 2012 Red Hat

 */

​

#include <drm/drm_fourcc.h>

#include <drm/drm_framebuffer.h>

#include <drm/drm_gem_cma_helper.h>

#include <drm/drm_gem_framebuffer_helper.h>

#include <drm/drm_plane.h>

#include <linux/module.h>

​

/**

 * DOC: framebuffer cma helper functions

 *

 * Provides helper functions for creating a cma (contiguous memory allocator)

 * backed framebuffer.

 *

 * drm_gem_fb_create() is used in the &drm_mode_config_funcs.fb_create

 * callback function to create a cma backed framebuffer.

 */

​

/**

 * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer

 * @fb: The framebuffer

 * @plane: Which plane

 *

 * Return the CMA GEM object for given framebuffer.

 *

 * This function will usually be called from the CRTC callback functions.

 */

struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,

                          unsigned int plane)

{

    struct drm_gem_object *gem;

​

    gem = drm_gem_fb_get_obj(fb, plane);

    if (!gem)

        return NULL;

​

    return to_drm_gem_cma_obj(gem);

}

EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);

​

/**

 * drm_fb_cma_get_gem_addr() - Get physical address for framebuffer, for pixel

 * formats where values are grouped in blocks this will get you the beginning of

 * the block

 * @fb: The framebuffer

 * @state: Which state of drm plane

 * @plane: Which plane

 * Return the CMA GEM address for given framebuffer.

 *

 * This function will usually be called from the PLANE callback functions.

 */

dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,

                   struct drm_plane_state *state,