drivers/gpu/drm/rockchip/rockchip_drm_fb.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <drm/drm.h>
  17 #include <drm/drmP.h>
  18 #include <drm/drm_atomic.h>
  19 #include <drm/drm_fb_helper.h>
  20 #include <drm/drm_crtc_helper.h>
  21
  22 #include "rockchip_drm_drv.h"
  23 #include "rockchip_drm_gem.h"
  24
  25 #define to_rockchip_fb(x) container_of(x, struct rockchip_drm_fb, fb)
  26
  27 struct rockchip_drm_fb {
  28         struct drm_framebuffer fb;
  29         struct drm_gem_object *obj[ROCKCHIP_MAX_FB_BUFFER];
  30 };
  31
  32 struct drm_gem_object *rockchip_fb_get_gem_obj(struct drm_framebuffer *fb,
  33                                                unsigned int plane)
  34 {
  35         struct rockchip_drm_fb *rk_fb = to_rockchip_fb(fb);
  36
  37         if (plane >= ROCKCHIP_MAX_FB_BUFFER)
  38                 return NULL;
  39
  40         return rk_fb->obj[plane];
  41 }
  42
  43 static void rockchip_drm_fb_destroy(struct drm_framebuffer *fb)
  44 {
  45         struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
  46         struct drm_gem_object *obj;
  47         int i;
  48
  49         for (i = 0; i < ROCKCHIP_MAX_FB_BUFFER; i++) {
  50                 obj = rockchip_fb->obj[i];
  51                 if (obj)
  52                         drm_gem_object_unreference_unlocked(obj);
  53         }
  54
  55         drm_framebuffer_cleanup(fb);
  56         kfree(rockchip_fb);
  57 }
  58
  59 static int rockchip_drm_fb_create_handle(struct drm_framebuffer *fb,
  60                                          struct drm_file *file_priv,
  61                                          unsigned int *handle)
  62 {
  63         struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
  64
  65         return drm_gem_handle_create(file_priv,
  66                                      rockchip_fb->obj[0], handle);
  67 }
  68
  69 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  70         .destroy        = rockchip_drm_fb_destroy,
  71         .create_handle  = rockchip_drm_fb_create_handle,
  72 };
  73
  74 static struct rockchip_drm_fb *
  75 rockchip_fb_alloc(struct drm_device *dev, struct drm_mode_fb_cmd2 *mode_cmd,
  76                   struct drm_gem_object **obj, unsigned int num_planes)
  77 {
  78         struct rockchip_drm_fb *rockchip_fb;
  79         int ret;
  80         int i;
  81
  82         rockchip_fb = kzalloc(sizeof(*rockchip_fb), GFP_KERNEL);
  83         if (!rockchip_fb)
  84                 return ERR_PTR(-ENOMEM);
  85
  86         drm_helper_mode_fill_fb_struct(&rockchip_fb->fb, mode_cmd);
  87
  88         for (i = 0; i < num_planes; i++)
  89                 rockchip_fb->obj[i] = obj[i];
  90
  91         ret = drm_framebuffer_init(dev, &rockchip_fb->fb,
  92                                    &rockchip_drm_fb_funcs);
  93         if (ret) {
  94                 dev_err(dev->dev, "Failed to initialize framebuffer: %d\n",
  95                         ret);
  96                 kfree(rockchip_fb);
  97                 return ERR_PTR(ret);
  98         }
  99
 100         return rockchip_fb;
 101 }
 102
 103 static struct drm_framebuffer *
 104 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 105                         struct drm_mode_fb_cmd2 *mode_cmd)
 106 {
 107         struct rockchip_drm_fb *rockchip_fb;
 108         struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
 109         struct drm_gem_object *obj;
 110         unsigned int hsub;
 111         unsigned int vsub;
 112         int num_planes;
 113         int ret;
 114         int i;
 115
 116         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 117         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 118         num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
 119                          ROCKCHIP_MAX_FB_BUFFER);
 120
 121         for (i = 0; i < num_planes; i++) {
 122                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 123                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 124                 unsigned int min_size;
 125
 126                 obj = drm_gem_object_lookup(dev, file_priv,
 127                                             mode_cmd->handles[i]);
 128                 if (!obj) {
 129                         dev_err(dev->dev, "Failed to lookup GEM object\n");
 130                         ret = -ENXIO;
 131                         goto err_gem_object_unreference;
 132                 }
 133
 134                 min_size = (height - 1) * mode_cmd->pitches[i] +
 135                         mode_cmd->offsets[i] +
 136                         width * drm_format_plane_cpp(mode_cmd->pixel_format, i);
 137
 138                 if (obj->size < min_size) {
 139                         drm_gem_object_unreference_unlocked(obj);
 140                         ret = -EINVAL;
 141                         goto err_gem_object_unreference;
 142                 }
 143                 objs[i] = obj;
 144         }
 145
 146         rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
 147         if (IS_ERR(rockchip_fb)) {
 148                 ret = PTR_ERR(rockchip_fb);
 149                 goto err_gem_object_unreference;
 150         }
 151
 152         return &rockchip_fb->fb;
 153
 154 err_gem_object_unreference:
 155         for (i--; i >= 0; i--)
 156                 drm_gem_object_unreference_unlocked(objs[i]);
 157         return ERR_PTR(ret);
 158 }
 159
 160 static void rockchip_drm_output_poll_changed(struct drm_device *dev)
 161 {
 162         struct rockchip_drm_private *private = dev->dev_private;
 163         struct drm_fb_helper *fb_helper = &private->fbdev_helper;
 164
 165         if (fb_helper)
 166                 drm_fb_helper_hotplug_event(fb_helper);
 167 }
 168
 169 static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc)
 170 {
 171         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 172         int pipe = drm_crtc_index(crtc);
 173         const struct rockchip_crtc_funcs *crtc_funcs = priv->crtc_funcs[pipe];
 174
 175         if (crtc_funcs && crtc_funcs->wait_for_update)
 176                 crtc_funcs->wait_for_update(crtc);
 177 }
 178
 179 /*
 180  * We can't use drm_atomic_helper_wait_for_vblanks() because rk3288 and rk3066
 181  * have hardware counters for neither vblanks nor scanlines, which results in
 182  * a race where:
 183  *                              | <-- HW vsync irq and reg take effect
 184  *             plane_commit --> |
 185  *      get_vblank and wait --> |
 186  *                              | <-- handle_vblank, vblank->count + 1
 187  *               cleanup_fb --> |
 188  *              iommu crash --> |
 189  *                              | <-- HW vsync irq and reg take effect
 190  *
 191  * This function is equivalent but uses rockchip_crtc_wait_for_update() instead
 192  * of waiting for vblank_count to change.
 193  */
 194 static void
 195 rockchip_atomic_wait_for_complete(struct drm_device *dev, struct drm_atomic_state *old_state)
 196 {
 197         struct drm_crtc_state *old_crtc_state;
 198         struct drm_crtc *crtc;
 199         int i, ret;
 200
 201         for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 202                 /* No one cares about the old state, so abuse it for tracking
 203                  * and store whether we hold a vblank reference (and should do a
 204                  * vblank wait) in the ->enable boolean.
 205                  */
 206                 old_crtc_state->enable = false;
 207
 208                 if (!crtc->state->active)
 209                         continue;
 210
 211                 if (!drm_atomic_helper_framebuffer_changed(dev,
 212                                 old_state, crtc))
 213                         continue;
 214
 215                 ret = drm_crtc_vblank_get(crtc);
 216                 if (ret != 0)
 217                         continue;
 218
 219                 old_crtc_state->enable = true;
 220         }
 221
 222         for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 223                 if (!old_crtc_state->enable)
 224                         continue;
 225
 226                 rockchip_crtc_wait_for_update(crtc);
 227                 drm_crtc_vblank_put(crtc);
 228         }
 229 }
 230
 231 static void
 232 rockchip_atomic_commit_complete(struct rockchip_atomic_commit *commit)
 233 {
 234         struct drm_atomic_state *state = commit->state;
 235         struct drm_device *dev = commit->dev;
 236
 237         /*
 238          * TODO: do fence wait here.
 239          */
 240
 241         /*
 242          * Rockchip crtc support runtime PM, can't update display planes
 243          * when crtc is disabled.
 244          *
 245          * drm_atomic_helper_commit comments detail that:
 246          *     For drivers supporting runtime PM the recommended sequence is
 247          *
 248          *     drm_atomic_helper_commit_modeset_disables(dev, state);
 249          *
 250          *     drm_atomic_helper_commit_modeset_enables(dev, state);
 251          *
 252          *     drm_atomic_helper_commit_planes(dev, state, true);
 253          *
 254          * See the kerneldoc entries for these three functions for more details.
 255          */
 256         drm_atomic_helper_commit_modeset_disables(dev, state);
 257
 258         drm_atomic_helper_commit_modeset_enables(dev, state);
 259
 260         drm_atomic_helper_commit_planes(dev, state, true);
 261
 262         rockchip_atomic_wait_for_complete(dev, state);
 263
 264         drm_atomic_helper_cleanup_planes(dev, state);
 265
 266         drm_atomic_state_free(state);
 267 }
 268
 269 void rockchip_drm_atomic_work(struct work_struct *work)
 270 {
 271         struct rockchip_atomic_commit *commit = container_of(work,
 272                                         struct rockchip_atomic_commit, work);
 273
 274         rockchip_atomic_commit_complete(commit);
 275 }
 276
 277 int rockchip_drm_atomic_commit(struct drm_device *dev,
 278                                struct drm_atomic_state *state,
 279                                bool async)
 280 {
 281         struct rockchip_drm_private *private = dev->dev_private;
 282         struct rockchip_atomic_commit *commit = &private->commit;
 283         int ret;
 284
 285         ret = drm_atomic_helper_prepare_planes(dev, state);
 286         if (ret)
 287                 return ret;
 288
 289         /* serialize outstanding asynchronous commits */
 290         mutex_lock(&commit->lock);
 291         flush_work(&commit->work);
 292
 293         drm_atomic_helper_swap_state(dev, state);
 294
 295         commit->dev = dev;
 296         commit->state = state;
 297
 298         if (async)
 299                 schedule_work(&commit->work);
 300         else
 301                 rockchip_atomic_commit_complete(commit);
 302
 303         mutex_unlock(&commit->lock);
 304
 305         return 0;
 306 }
 307
 308 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 309         .fb_create = rockchip_user_fb_create,
 310         .output_poll_changed = rockchip_drm_output_poll_changed,
 311         .atomic_check = drm_atomic_helper_check,
 312         .atomic_commit = rockchip_drm_atomic_commit,
 313 };
 314
 315 struct drm_framebuffer *
 316 rockchip_drm_framebuffer_init(struct drm_device *dev,
 317                               struct drm_mode_fb_cmd2 *mode_cmd,
 318                               struct drm_gem_object *obj)
 319 {
 320         struct rockchip_drm_fb *rockchip_fb;
 321
 322         rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 323         if (IS_ERR(rockchip_fb))
 324                 return NULL;
 325
 326         return &rockchip_fb->fb;
 327 }
 328
 329 void rockchip_drm_mode_config_init(struct drm_device *dev)
 330 {
 331         dev->mode_config.min_width = 0;
 332         dev->mode_config.min_height = 0;
 333
 334         /*
 335          * set max width and height as default value(4096x4096).
 336          * this value would be used to check framebuffer size limitation
 337          * at drm_mode_addfb().
 338          */
 339         dev->mode_config.max_width = 4096;
 340         dev->mode_config.max_height = 4096;
 341
 342         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
 343 }