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 #include "rockchip_drm_psr.h"
  21
  22 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  23         .destroy       = drm_gem_fb_destroy,
  24         .create_handle = drm_gem_fb_create_handle,
  25         .dirty         = drm_atomic_helper_dirtyfb,
  26 };
  27
  28 static struct drm_framebuffer *
  29 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
  30                   struct drm_gem_object **obj, unsigned int num_planes)
  31 {
  32         struct drm_framebuffer *fb;
  33         int ret;
  34         int i;
  35
  36         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  37         if (!fb)
  38                 return ERR_PTR(-ENOMEM);
  39
  40         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  41
  42         for (i = 0; i < num_planes; i++)
  43                 fb->obj[i] = obj[i];
  44
  45         ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
  46         if (ret) {
  47                 DRM_DEV_ERROR(dev->dev,
  48                               "Failed to initialize framebuffer: %d\n",
  49                               ret);
  50                 kfree(fb);
  51                 return ERR_PTR(ret);
  52         }
  53
  54         return fb;
  55 }
  56
  57 static struct drm_framebuffer *
  58 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  59                         const struct drm_mode_fb_cmd2 *mode_cmd)
  60 {
  61         const struct drm_format_info *info = drm_get_format_info(dev,
  62                                                                  mode_cmd);
  63         struct drm_framebuffer *fb;
  64         struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
  65         struct drm_gem_object *obj;
  66         int num_planes = min_t(int, info->num_planes, ROCKCHIP_MAX_FB_BUFFER);
  67         int ret;
  68         int i;
  69
  70         for (i = 0; i < num_planes; i++) {
  71                 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
  72                 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
  73                 unsigned int min_size;
  74
  75                 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
  76                 if (!obj) {
  77                         DRM_DEV_ERROR(dev->dev,
  78                                       "Failed to lookup GEM object\n");
  79                         ret = -ENXIO;
  80                         goto err_gem_object_unreference;
  81                 }
  82
  83                 min_size = (height - 1) * mode_cmd->pitches[i] +
  84                         mode_cmd->offsets[i] +
  85                         width * info->cpp[i];
  86
  87                 if (obj->size < min_size) {
  88                         drm_gem_object_put_unlocked(obj);
  89                         ret = -EINVAL;
  90                         goto err_gem_object_unreference;
  91                 }
  92                 objs[i] = obj;
  93         }
  94
  95         fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
  96         if (IS_ERR(fb)) {
  97                 ret = PTR_ERR(fb);
  98                 goto err_gem_object_unreference;
  99         }
 100
 101         return fb;
 102
 103 err_gem_object_unreference:
 104         for (i--; i >= 0; i--)
 105                 drm_gem_object_put_unlocked(objs[i]);
 106         return ERR_PTR(ret);
 107 }
 108
 109 static void
 110 rockchip_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
 111 {
 112         struct drm_device *dev = old_state->dev;
 113
 114         rockchip_drm_psr_inhibit_get_state(old_state);
 115
 116         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 117
 118         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 119
 120         drm_atomic_helper_commit_planes(dev, old_state,
 121                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 122
 123         rockchip_drm_psr_inhibit_put_state(old_state);
 124
 125         drm_atomic_helper_commit_hw_done(old_state);
 126
 127         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 128
 129         drm_atomic_helper_cleanup_planes(dev, old_state);
 130 }
 131
 132 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 133         .atomic_commit_tail = rockchip_atomic_helper_commit_tail_rpm,
 134 };
 135
 136 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 137         .fb_create = rockchip_user_fb_create,
 138         .output_poll_changed = drm_fb_helper_output_poll_changed,
 139         .atomic_check = drm_atomic_helper_check,
 140         .atomic_commit = drm_atomic_helper_commit,
 141 };
 142
 143 struct drm_framebuffer *
 144 rockchip_drm_framebuffer_init(struct drm_device *dev,
 145                               const struct drm_mode_fb_cmd2 *mode_cmd,
 146                               struct drm_gem_object *obj)
 147 {
 148         struct drm_framebuffer *fb;
 149
 150         fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 151         if (IS_ERR(fb))
 152                 return ERR_CAST(fb);
 153
 154         return fb;
 155 }
 156
 157 void rockchip_drm_mode_config_init(struct drm_device *dev)
 158 {
 159         dev->mode_config.min_width = 0;
 160         dev->mode_config.min_height = 0;
 161
 162         /*
 163          * set max width and height as default value(4096x4096).
 164          * this value would be used to check framebuffer size limitation
 165          * at drm_mode_addfb().
 166          */
 167         dev->mode_config.max_width = 4096;
 168         dev->mode_config.max_height = 4096;
 169
 170         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
 171         dev->mode_config.helper_private = &rockchip_mode_config_helpers;
 172 }