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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.allow_fb_modifiers = true;
- dev->mode_config.normalize_zpos = true;
- }
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