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_fb.h"
  24 #include "rockchip_drm_gem.h"
  25
  26 #define to_rockchip_fb(x) container_of(x, struct rockchip_drm_fb, fb)
  27
  28 struct rockchip_drm_fb {
  29         struct drm_framebuffer fb;
  30         struct drm_gem_object *obj[ROCKCHIP_MAX_FB_BUFFER];
  31 };
  32
  33 struct drm_gem_object *rockchip_fb_get_gem_obj(struct drm_framebuffer *fb,
  34                                                unsigned int plane)
  35 {
  36         struct rockchip_drm_fb *rk_fb = to_rockchip_fb(fb);
  37
  38         if (plane >= ROCKCHIP_MAX_FB_BUFFER)
  39                 return NULL;
  40
  41         return rk_fb->obj[plane];
  42 }
  43
  44 static void rockchip_drm_fb_destroy(struct drm_framebuffer *fb)
  45 {
  46         struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
  47         int i;
  48
  49         for (i = 0; i < ROCKCHIP_MAX_FB_BUFFER; i++)
  50                 drm_gem_object_unreference_unlocked(rockchip_fb->obj[i]);
  51
  52         drm_framebuffer_cleanup(fb);
  53         kfree(rockchip_fb);
  54 }
  55
  56 static int rockchip_drm_fb_create_handle(struct drm_framebuffer *fb,
  57                                          struct drm_file *file_priv,
  58                                          unsigned int *handle)
  59 {
  60         struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
  61
  62         return drm_gem_handle_create(file_priv,
  63                                      rockchip_fb->obj[0], handle);
  64 }
  65
  66 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  67         .destroy        = rockchip_drm_fb_destroy,
  68         .create_handle  = rockchip_drm_fb_create_handle,
  69 };
  70
  71 static struct rockchip_drm_fb *
  72 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
  73                   struct drm_gem_object **obj, unsigned int num_planes)
  74 {
  75         struct rockchip_drm_fb *rockchip_fb;
  76         int ret;
  77         int i;
  78
  79         rockchip_fb = kzalloc(sizeof(*rockchip_fb), GFP_KERNEL);
  80         if (!rockchip_fb)
  81                 return ERR_PTR(-ENOMEM);
  82
  83         drm_helper_mode_fill_fb_struct(&rockchip_fb->fb, mode_cmd);
  84
  85         for (i = 0; i < num_planes; i++)
  86                 rockchip_fb->obj[i] = obj[i];
  87
  88         ret = drm_framebuffer_init(dev, &rockchip_fb->fb,
  89                                    &rockchip_drm_fb_funcs);
  90         if (ret) {
  91                 dev_err(dev->dev, "Failed to initialize framebuffer: %d\n",
  92                         ret);
  93                 kfree(rockchip_fb);
  94                 return ERR_PTR(ret);
  95         }
  96
  97         return rockchip_fb;
  98 }
  99
 100 static struct drm_framebuffer *
 101 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 102                         const struct drm_mode_fb_cmd2 *mode_cmd)
 103 {
 104         struct rockchip_drm_fb *rockchip_fb;
 105         struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
 106         struct drm_gem_object *obj;
 107         unsigned int hsub;
 108         unsigned int vsub;
 109         int num_planes;
 110         int ret;
 111         int i;
 112
 113         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 114         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 115         num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
 116                          ROCKCHIP_MAX_FB_BUFFER);
 117
 118         for (i = 0; i < num_planes; i++) {
 119                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 120                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 121                 unsigned int min_size;
 122
 123                 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
 124                 if (!obj) {
 125                         dev_err(dev->dev, "Failed to lookup GEM object\n");
 126                         ret = -ENXIO;
 127                         goto err_gem_object_unreference;
 128                 }
 129
 130                 min_size = (height - 1) * mode_cmd->pitches[i] +
 131                         mode_cmd->offsets[i] +
 132                         width * drm_format_plane_cpp(mode_cmd->pixel_format, i);
 133
 134                 if (obj->size < min_size) {
 135                         drm_gem_object_unreference_unlocked(obj);
 136                         ret = -EINVAL;
 137                         goto err_gem_object_unreference;
 138                 }
 139                 objs[i] = obj;
 140         }
 141
 142         rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
 143         if (IS_ERR(rockchip_fb)) {
 144                 ret = PTR_ERR(rockchip_fb);
 145                 goto err_gem_object_unreference;
 146         }
 147
 148         return &rockchip_fb->fb;
 149
 150 err_gem_object_unreference:
 151         for (i--; i >= 0; i--)
 152                 drm_gem_object_unreference_unlocked(objs[i]);
 153         return ERR_PTR(ret);
 154 }
 155
 156 static void rockchip_drm_output_poll_changed(struct drm_device *dev)
 157 {
 158         struct rockchip_drm_private *private = dev->dev_private;
 159         struct drm_fb_helper *fb_helper = &private->fbdev_helper;
 160
 161         if (fb_helper)
 162                 drm_fb_helper_hotplug_event(fb_helper);
 163 }
 164
 165 static void rockchip_crtc_wait_for_update(struct drm_crtc *crtc)
 166 {
 167         struct rockchip_drm_private *priv = crtc->dev->dev_private;
 168         int pipe = drm_crtc_index(crtc);
 169         const struct rockchip_crtc_funcs *crtc_funcs = priv->crtc_funcs[pipe];
 170
 171         if (crtc_funcs && crtc_funcs->wait_for_update)
 172                 crtc_funcs->wait_for_update(crtc);
 173 }
 174
 175 /*
 176  * We can't use drm_atomic_helper_wait_for_vblanks() because rk3288 and rk3066
 177  * have hardware counters for neither vblanks nor scanlines, which results in
 178  * a race where:
 179  *                              | <-- HW vsync irq and reg take effect
 180  *             plane_commit --> |
 181  *      get_vblank and wait --> |
 182  *                              | <-- handle_vblank, vblank->count + 1
 183  *               cleanup_fb --> |
 184  *              iommu crash --> |
 185  *                              | <-- HW vsync irq and reg take effect
 186  *
 187  * This function is equivalent but uses rockchip_crtc_wait_for_update() instead
 188  * of waiting for vblank_count to change.
 189  */
 190 static void
 191 rockchip_atomic_wait_for_complete(struct drm_device *dev, struct drm_atomic_state *old_state)
 192 {
 193         struct drm_crtc_state *old_crtc_state;
 194         struct drm_crtc *crtc;
 195         int i, ret;
 196
 197         for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 198                 /* No one cares about the old state, so abuse it for tracking
 199                  * and store whether we hold a vblank reference (and should do a
 200                  * vblank wait) in the ->enable boolean.
 201                  */
 202                 old_crtc_state->enable = false;
 203
 204                 if (!crtc->state->active)
 205                         continue;
 206
 207                 if (!drm_atomic_helper_framebuffer_changed(dev,
 208                                 old_state, crtc))
 209                         continue;
 210
 211                 ret = drm_crtc_vblank_get(crtc);
 212                 if (ret != 0)
 213                         continue;
 214
 215                 old_crtc_state->enable = true;
 216         }
 217
 218         for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
 219                 if (!old_crtc_state->enable)
 220                         continue;
 221
 222                 rockchip_crtc_wait_for_update(crtc);
 223                 drm_crtc_vblank_put(crtc);
 224         }
 225 }
 226
 227 static void
 228 rockchip_atomic_commit_tail(struct drm_atomic_state *state)
 229 {
 230         struct drm_device *dev = state->dev;
 231
 232         drm_atomic_helper_commit_modeset_disables(dev, state);
 233
 234         drm_atomic_helper_commit_modeset_enables(dev, state);
 235
 236         drm_atomic_helper_commit_planes(dev, state, true);
 237
 238         drm_atomic_helper_commit_hw_done(state);
 239
 240         rockchip_atomic_wait_for_complete(dev, state);
 241
 242         drm_atomic_helper_cleanup_planes(dev, state);
 243 }
 244
 245 static struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 246         .atomic_commit_tail = rockchip_atomic_commit_tail,
 247 };
 248
 249 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 250         .fb_create = rockchip_user_fb_create,
 251         .output_poll_changed = rockchip_drm_output_poll_changed,
 252         .atomic_check = drm_atomic_helper_check,
 253         .atomic_commit = drm_atomic_helper_commit,
 254 };
 255
 256 struct drm_framebuffer *
 257 rockchip_drm_framebuffer_init(struct drm_device *dev,
 258                               const struct drm_mode_fb_cmd2 *mode_cmd,
 259                               struct drm_gem_object *obj)
 260 {
 261         struct rockchip_drm_fb *rockchip_fb;
 262
 263         rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 264         if (IS_ERR(rockchip_fb))
 265                 return NULL;
 266
 267         return &rockchip_fb->fb;
 268 }
 269
 270 void rockchip_drm_mode_config_init(struct drm_device *dev)
 271 {
 272         dev->mode_config.min_width = 0;
 273         dev->mode_config.min_height = 0;
 274
 275         /*
 276          * set max width and height as default value(4096x4096).
 277          * this value would be used to check framebuffer size limitation
 278          * at drm_mode_addfb().
 279          */
 280         dev->mode_config.max_width = 4096;
 281         dev->mode_config.max_height = 4096;
 282
 283         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
 284         dev->mode_config.helper_private = &rockchip_mode_config_helpers;
 285 }