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// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_fb.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Authors:
* Inki Dae <inki.dae@samsung.com>
* Joonyoung Shim <jy0922.shim@samsung.com>
* Seung-Woo Kim <sw0312.kim@samsung.com>
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.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 <drm/exynos_drm.h>
#include "exynos_drm_crtc.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_fbdev.h"
static int check_fb_gem_memory_type(struct drm_device *drm_dev,
struct exynos_drm_gem *exynos_gem)
{
unsigned int flags;
/*
* if exynos drm driver supports iommu then framebuffer can use
* all the buffer types.
*/
if (is_drm_iommu_supported(drm_dev))
return 0;
flags = exynos_gem->flags;
/*
* Physically non-contiguous memory type for framebuffer is not
* supported without IOMMU.
*/
if (IS_NONCONTIG_BUFFER(flags)) {
DRM_DEV_ERROR(drm_dev->dev,
"Non-contiguous GEM memory is not supported.\n");
return -EINVAL;
}
return 0;
}
static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
.destroy = drm_gem_fb_destroy,
.create_handle = drm_gem_fb_create_handle,
};
struct drm_framebuffer *
exynos_drm_framebuffer_init(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *mode_cmd,
struct exynos_drm_gem **exynos_gem,
int count)
{
struct drm_framebuffer *fb;
int i;
int ret;
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
if (!fb)
return ERR_PTR(-ENOMEM);
for (i = 0; i < count; i++) {
ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
if (ret < 0)
goto err;
fb->obj[i] = &exynos_gem[i]->base;
}
drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev,
"failed to initialize framebuffer\n");
goto err;
}
return fb;
err:
kfree(fb);
return ERR_PTR(ret);
}
static struct drm_framebuffer *
exynos_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 exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
struct drm_framebuffer *fb;
int i;
int ret;
for (i = 0; i < info->num_planes; i++) {
unsigned int height = (i == 0) ? mode_cmd->height :
DIV_ROUND_UP(mode_cmd->height, info->vsub);
unsigned long size = height * mode_cmd->pitches[i] +
mode_cmd->offsets[i];
exynos_gem[i] = exynos_drm_gem_get(file_priv,
mode_cmd->handles[i]);
if (!exynos_gem[i]) {
DRM_DEV_ERROR(dev->dev,
"failed to lookup gem object\n");
ret = -ENOENT;
goto err;
}
if (size > exynos_gem[i]->size) {
i++;
ret = -EINVAL;
goto err;
}
}
fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
if (IS_ERR(fb)) {
ret = PTR_ERR(fb);
goto err;
}
return fb;
err:
while (i--)
exynos_drm_gem_put(exynos_gem[i]);
return ERR_PTR(ret);
}
dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
{
struct exynos_drm_gem *exynos_gem;
if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
return 0;
exynos_gem = to_exynos_gem(fb->obj[index]);
return exynos_gem->dma_addr + fb->offsets[index];
}
static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
.fb_create = exynos_user_fb_create,
.output_poll_changed = drm_fb_helper_output_poll_changed,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
void exynos_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 = &exynos_drm_mode_config_funcs;
dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
dev->mode_config.normalize_zpos = true;
}
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