drivers/gpu/drm/rockchip/rockchip_drm_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   4  * Author:Mark Yao <mark.yao@rock-chips.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8
   9 #include <drm/drm.h>
  10 #include <drm/drm_atomic.h>
  11 #include <drm/drm_damage_helper.h>
  12 #include <drm/drm_fb_helper.h>
  13 #include <drm/drm_fourcc.h>
  14 #include <drm/drm_gem_framebuffer_helper.h>
  15 #include <drm/drm_probe_helper.h>
  16
  17 #include "rockchip_drm_drv.h"
  18 #include "rockchip_drm_fb.h"
  19 #include "rockchip_drm_gem.h"
  20
  21 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  22         .destroy       = drm_gem_fb_destroy,
  23         .create_handle = drm_gem_fb_create_handle,
  24         .dirty         = drm_atomic_helper_dirtyfb,
  25 };
  26
  27 static struct drm_framebuffer *
  28 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
  29                   struct drm_gem_object **obj, unsigned int num_planes)
  30 {
  31         struct drm_framebuffer *fb;
  32         int ret;
  33         int i;
  34
  35         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  36         if (!fb)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  40
  41         for (i = 0; i < num_planes; i++)
  42                 fb->obj[i] = obj[i];
  43
  44         ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
  45         if (ret) {
  46                 DRM_DEV_ERROR(dev->dev,
  47                               "Failed to initialize framebuffer: %d\n",
  48                               ret);
  49                 kfree(fb);
  50                 return ERR_PTR(ret);
  51         }
  52
  53         return fb;
  54 }
  55
  56 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
  57         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  58 };
  59
  60 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
  61         .fb_create = drm_gem_fb_create_with_dirty,
  62         .output_poll_changed = drm_fb_helper_output_poll_changed,
  63         .atomic_check = drm_atomic_helper_check,
  64         .atomic_commit = drm_atomic_helper_commit,
  65 };
  66
  67 struct drm_framebuffer *
  68 rockchip_drm_framebuffer_init(struct drm_device *dev,
  69                               const struct drm_mode_fb_cmd2 *mode_cmd,
  70                               struct drm_gem_object *obj)
  71 {
  72         struct drm_framebuffer *fb;
  73
  74         fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
  75         if (IS_ERR(fb))
  76                 return ERR_CAST(fb);
  77
  78         return fb;
  79 }
  80
  81 void rockchip_drm_mode_config_init(struct drm_device *dev)
  82 {
  83         dev->mode_config.min_width = 0;
  84         dev->mode_config.min_height = 0;
  85
  86         /*
  87          * set max width and height as default value(4096x4096).
  88          * this value would be used to check framebuffer size limitation
  89          * at drm_mode_addfb().
  90          */
  91         dev->mode_config.max_width = 4096;
  92         dev->mode_config.max_height = 4096;
  93
  94         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
  95         dev->mode_config.helper_private = &rockchip_mode_config_helpers;
  96 }