// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
 * Author:Mark Yao <mark.yao@rock-chips.com>
 */

#include <linux/kernel.h>

#include <drm/drm.h>
#include <drm/drm_atomic.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_probe_helper.h>

#include "rockchip_drm_drv.h"
#include "rockchip_drm_fb.h"
#include "rockchip_drm_gem.h"

static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
	.destroy       = drm_gem_fb_destroy,
	.create_handle = drm_gem_fb_create_handle,
	.dirty	       = drm_atomic_helper_dirtyfb,
};

static struct drm_framebuffer *
rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
		  struct drm_gem_object **obj, unsigned int num_planes)
{
	struct drm_framebuffer *fb;
	int ret;
	int i;

	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
	if (!fb)
		return ERR_PTR(-ENOMEM);

	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);

	for (i = 0; i < num_planes; i++)
		fb->obj[i] = obj[i];

	ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
	if (ret) {
		DRM_DEV_ERROR(dev->dev,
			      "Failed to initialize framebuffer: %d\n",
			      ret);
		kfree(fb);
		return ERR_PTR(ret);
	}

	return fb;
}

static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};

static struct drm_framebuffer *
rockchip_fb_create(struct drm_device *dev, struct drm_file *file,
		   const struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_afbc_framebuffer *afbc_fb;
	const struct drm_format_info *info;
	int ret;

	info = drm_get_format_info(dev, mode_cmd);
	if (!info)
		return ERR_PTR(-ENOMEM);

	afbc_fb = kzalloc(sizeof(*afbc_fb), GFP_KERNEL);
	if (!afbc_fb)
		return ERR_PTR(-ENOMEM);

	ret = drm_gem_fb_init_with_funcs(dev, &afbc_fb->base, file, mode_cmd,
					 &rockchip_drm_fb_funcs);
	if (ret) {
		kfree(afbc_fb);
		return ERR_PTR(ret);
	}

	if (drm_is_afbc(mode_cmd->modifier[0])) {
		int ret, i;

		ret = drm_gem_fb_afbc_init(dev, mode_cmd, afbc_fb);
		if (ret) {
			struct drm_gem_object **obj = afbc_fb->base.obj;

			for (i = 0; i < info->num_planes; ++i)
				drm_gem_object_put(obj[i]);

			kfree(afbc_fb);
			return ERR_PTR(ret);
		}
	}

	return &afbc_fb->base;
}

static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
	.fb_create = rockchip_fb_create,
	.output_poll_changed = drm_fb_helper_output_poll_changed,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

struct drm_framebuffer *
rockchip_drm_framebuffer_init(struct drm_device *dev,
			      const struct drm_mode_fb_cmd2 *mode_cmd,
			      struct drm_gem_object *obj)
{
	struct drm_framebuffer *fb;

	fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
	if (IS_ERR(fb))
		return ERR_CAST(fb);

	return fb;
}

void rockchip_drm_mode_config_init(struct drm_device *dev)
{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	 * set max width and height as default value(4096x4096).
	 * this value would be used to check framebuffer size limitation
	 * at drm_mode_addfb().
	 */
	dev->mode_config.max_width = 4096;
	dev->mode_config.max_height = 4096;

	dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
	dev->mode_config.helper_private = &rockchip_mode_config_helpers;

	dev->mode_config.normalize_zpos = true;
}