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// 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_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 struct drm_framebuffer *
rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
const struct drm_format_info *info = drm_get_format_info(dev,
mode_cmd);
struct drm_framebuffer *fb;
struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
struct drm_gem_object *obj;
int num_planes = min_t(int, info->num_planes, ROCKCHIP_MAX_FB_BUFFER);
int ret;
int i;
for (i = 0; i < num_planes; i++) {
unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
unsigned int min_size;
obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
if (!obj) {
DRM_DEV_ERROR(dev->dev,
"Failed to lookup GEM object\n");
ret = -ENXIO;
goto err_gem_object_unreference;
}
min_size = (height - 1) * mode_cmd->pitches[i] +
mode_cmd->offsets[i] +
width * info->cpp[i];
if (obj->size < min_size) {
drm_gem_object_put_unlocked(obj);
ret = -EINVAL;
goto err_gem_object_unreference;
}
objs[i] = obj;
}
fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
if (IS_ERR(fb)) {
ret = PTR_ERR(fb);
goto err_gem_object_unreference;
}
return fb;
err_gem_object_unreference:
for (i--; i >= 0; i--)
drm_gem_object_put_unlocked(objs[i]);
return ERR_PTR(ret);
}
static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
.fb_create = rockchip_user_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;
}
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