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 #include <drm/drm.h>
   9 #include <drm/drmP.h>
  10 #include <drm/drm_atomic.h>
  11 #include <drm/drm_fb_helper.h>
  12 #include <drm/drm_gem_framebuffer_helper.h>
  13 #include <drm/drm_probe_helper.h>
  14
  15 #include "rockchip_drm_drv.h"
  16 #include "rockchip_drm_fb.h"
  17 #include "rockchip_drm_gem.h"
  18 #include "rockchip_drm_psr.h"
  19
  20 static int rockchip_drm_fb_dirty(struct drm_framebuffer *fb,
  21                                  struct drm_file *file,
  22                                  unsigned int flags, unsigned int color,
  23                                  struct drm_clip_rect *clips,
  24                                  unsigned int num_clips)
  25 {
  26         rockchip_drm_psr_flush_all(fb->dev);
  27         return 0;
  28 }
  29
  30 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  31         .destroy       = drm_gem_fb_destroy,
  32         .create_handle = drm_gem_fb_create_handle,
  33         .dirty         = rockchip_drm_fb_dirty,
  34 };
  35
  36 static struct drm_framebuffer *
  37 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
  38                   struct drm_gem_object **obj, unsigned int num_planes)
  39 {
  40         struct drm_framebuffer *fb;
  41         int ret;
  42         int i;
  43
  44         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  45         if (!fb)
  46                 return ERR_PTR(-ENOMEM);
  47
  48         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  49
  50         for (i = 0; i < num_planes; i++)
  51                 fb->obj[i] = obj[i];
  52
  53         ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
  54         if (ret) {
  55                 DRM_DEV_ERROR(dev->dev,
  56                               "Failed to initialize framebuffer: %d\n",
  57                               ret);
  58                 kfree(fb);
  59                 return ERR_PTR(ret);
  60         }
  61
  62         return fb;
  63 }
  64
  65 static struct drm_framebuffer *
  66 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  67                         const struct drm_mode_fb_cmd2 *mode_cmd)
  68 {
  69         struct drm_framebuffer *fb;
  70         struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
  71         struct drm_gem_object *obj;
  72         unsigned int hsub;
  73         unsigned int vsub;
  74         int num_planes;
  75         int ret;
  76         int i;
  77
  78         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
  79         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
  80         num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
  81                          ROCKCHIP_MAX_FB_BUFFER);
  82
  83         for (i = 0; i < num_planes; i++) {
  84                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
  85                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
  86                 unsigned int min_size;
  87
  88                 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
  89                 if (!obj) {
  90                         DRM_DEV_ERROR(dev->dev,
  91                                       "Failed to lookup GEM object\n");
  92                         ret = -ENXIO;
  93                         goto err_gem_object_unreference;
  94                 }
  95
  96                 min_size = (height - 1) * mode_cmd->pitches[i] +
  97                         mode_cmd->offsets[i] +
  98                         width * drm_format_plane_cpp(mode_cmd->pixel_format, i);
  99
 100                 if (obj->size < min_size) {
 101                         drm_gem_object_put_unlocked(obj);
 102                         ret = -EINVAL;
 103                         goto err_gem_object_unreference;
 104                 }
 105                 objs[i] = obj;
 106         }
 107
 108         fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
 109         if (IS_ERR(fb)) {
 110                 ret = PTR_ERR(fb);
 111                 goto err_gem_object_unreference;
 112         }
 113
 114         return fb;
 115
 116 err_gem_object_unreference:
 117         for (i--; i >= 0; i--)
 118                 drm_gem_object_put_unlocked(objs[i]);
 119         return ERR_PTR(ret);
 120 }
 121
 122 static void
 123 rockchip_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
 124 {
 125         struct drm_device *dev = old_state->dev;
 126
 127         rockchip_drm_psr_inhibit_get_state(old_state);
 128
 129         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 130
 131         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 132
 133         drm_atomic_helper_commit_planes(dev, old_state,
 134                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 135
 136         rockchip_drm_psr_inhibit_put_state(old_state);
 137
 138         drm_atomic_helper_commit_hw_done(old_state);
 139
 140         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 141
 142         drm_atomic_helper_cleanup_planes(dev, old_state);
 143 }
 144
 145 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 146         .atomic_commit_tail = rockchip_atomic_helper_commit_tail_rpm,
 147 };
 148
 149 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 150         .fb_create = rockchip_user_fb_create,
 151         .output_poll_changed = drm_fb_helper_output_poll_changed,
 152         .atomic_check = drm_atomic_helper_check,
 153         .atomic_commit = drm_atomic_helper_commit,
 154 };
 155
 156 struct drm_framebuffer *
 157 rockchip_drm_framebuffer_init(struct drm_device *dev,
 158                               const struct drm_mode_fb_cmd2 *mode_cmd,
 159                               struct drm_gem_object *obj)
 160 {
 161         struct drm_framebuffer *fb;
 162
 163         fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 164         if (IS_ERR(fb))
 165                 return ERR_CAST(fb);
 166
 167         return fb;
 168 }
 169
 170 void rockchip_drm_mode_config_init(struct drm_device *dev)
 171 {
 172         dev->mode_config.min_width = 0;
 173         dev->mode_config.min_height = 0;
 174
 175         /*
 176          * set max width and height as default value(4096x4096).
 177          * this value would be used to check framebuffer size limitation
 178          * at drm_mode_addfb().
 179          */
 180         dev->mode_config.max_width = 4096;
 181         dev->mode_config.max_height = 4096;
 182
 183         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
 184         dev->mode_config.helper_private = &rockchip_mode_config_helpers;
 185 }