drivers/gpu/drm/drm_fb_helper.c

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/kernel.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/slab.h>
  35 #include <linux/fb.h>
  36 #include <linux/module.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_crtc_helper.h>
  41
  42 static LIST_HEAD(kernel_fb_helper_list);
  43
  44 /**
  45  * DOC: fbdev helpers
  46  *
  47  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  48  * mode setting driver. They can be used mostly independently from the crtc
  49  * helper functions used by many drivers to implement the kernel mode setting
  50  * interfaces.
  51  *
  52  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  53  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  54  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  55  * default behaviour can override the third step with their own code.
  56  * Teardown is done with drm_fb_helper_fini().
  57  *
  58  * At runtime drivers should restore the fbdev console by calling
  59  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  60  * They should also notify the fb helper code from updates to the output
  61  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  62  * integration with the output polling code in drm_crtc_helper.c the modeset
  63  * code provides a ->output_poll_changed callback.
  64  *
  65  * All other functions exported by the fb helper library can be used to
  66  * implement the fbdev driver interface by the driver.
  67  *
  68  * It is possible, though perhaps somewhat tricky, to implement race-free
  69  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  70  * helper must be called first to initialize the minimum required to make
  71  * hotplug detection work. Drivers also need to make sure to properly set up
  72  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  73  * it is safe to enable interrupts and start processing hotplug events. At the
  74  * same time, drivers should initialize all modeset objects such as CRTCs,
  75  * encoders and connectors. To finish up the fbdev helper initialization, the
  76  * drm_fb_helper_init() function is called. To probe for all attached displays
  77  * and set up an initial configuration using the detected hardware, drivers
  78  * should call drm_fb_helper_single_add_all_connectors() followed by
  79  * drm_fb_helper_initial_config().
  80  */
  81
  82 /**
  83  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  84  *                                             emulation helper
  85  * @fb_helper: fbdev initialized with drm_fb_helper_init
  86  *
  87  * This functions adds all the available connectors for use with the given
  88  * fb_helper. This is a separate step to allow drivers to freely assign
  89  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  90  * not adequate to be used for the fbcon.
  91  *
  92  * This function is protected against concurrent connector hotadds/removals
  93  * using drm_fb_helper_add_one_connector() and
  94  * drm_fb_helper_remove_one_connector().
  95  */
  96 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  97 {
  98         struct drm_device *dev = fb_helper->dev;
  99         struct drm_connector *connector;
 100         int i;
 101
 102         mutex_lock(&dev->mode_config.mutex);
 103         drm_for_each_connector(connector, dev) {
 104                 struct drm_fb_helper_connector *fb_helper_connector;
 105
 106                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 107                 if (!fb_helper_connector)
 108                         goto fail;
 109
 110                 fb_helper_connector->connector = connector;
 111                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 112         }
 113         mutex_unlock(&dev->mode_config.mutex);
 114         return 0;
 115 fail:
 116         for (i = 0; i < fb_helper->connector_count; i++) {
 117                 kfree(fb_helper->connector_info[i]);
 118                 fb_helper->connector_info[i] = NULL;
 119         }
 120         fb_helper->connector_count = 0;
 121         mutex_unlock(&dev->mode_config.mutex);
 122
 123         return -ENOMEM;
 124 }
 125 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 126
 127 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 128 {
 129         struct drm_fb_helper_connector **temp;
 130         struct drm_fb_helper_connector *fb_helper_connector;
 131
 132         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 133         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 134                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 135                 if (!temp)
 136                         return -ENOMEM;
 137
 138                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 139                 fb_helper->connector_info = temp;
 140         }
 141
 142
 143         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 144         if (!fb_helper_connector)
 145                 return -ENOMEM;
 146
 147         fb_helper_connector->connector = connector;
 148         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 152
 153 static void remove_from_modeset(struct drm_mode_set *set,
 154                 struct drm_connector *connector)
 155 {
 156         int i, j;
 157
 158         for (i = 0; i < set->num_connectors; i++) {
 159                 if (set->connectors[i] == connector)
 160                         break;
 161         }
 162
 163         if (i == set->num_connectors)
 164                 return;
 165
 166         for (j = i + 1; j < set->num_connectors; j++) {
 167                 set->connectors[j - 1] = set->connectors[j];
 168         }
 169         set->num_connectors--;
 170
 171         /* because i915 is pissy about this..
 172          * TODO maybe need to makes sure we set it back to !=NULL somewhere?
 173          */
 174         if (set->num_connectors == 0)
 175                 set->fb = NULL;
 176 }
 177
 178 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 179                                        struct drm_connector *connector)
 180 {
 181         struct drm_fb_helper_connector *fb_helper_connector;
 182         int i, j;
 183
 184         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 185
 186         for (i = 0; i < fb_helper->connector_count; i++) {
 187                 if (fb_helper->connector_info[i]->connector == connector)
 188                         break;
 189         }
 190
 191         if (i == fb_helper->connector_count)
 192                 return -EINVAL;
 193         fb_helper_connector = fb_helper->connector_info[i];
 194
 195         for (j = i + 1; j < fb_helper->connector_count; j++) {
 196                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 197         }
 198         fb_helper->connector_count--;
 199         kfree(fb_helper_connector);
 200
 201         /* also cleanup dangling references to the connector: */
 202         for (i = 0; i < fb_helper->crtc_count; i++)
 203                 remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
 204
 205         return 0;
 206 }
 207 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 208
 209 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 210 {
 211         uint16_t *r_base, *g_base, *b_base;
 212         int i;
 213
 214         if (helper->funcs->gamma_get == NULL)
 215                 return;
 216
 217         r_base = crtc->gamma_store;
 218         g_base = r_base + crtc->gamma_size;
 219         b_base = g_base + crtc->gamma_size;
 220
 221         for (i = 0; i < crtc->gamma_size; i++)
 222                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 223 }
 224
 225 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 226 {
 227         uint16_t *r_base, *g_base, *b_base;
 228
 229         if (crtc->funcs->gamma_set == NULL)
 230                 return;
 231
 232         r_base = crtc->gamma_store;
 233         g_base = r_base + crtc->gamma_size;
 234         b_base = g_base + crtc->gamma_size;
 235
 236         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 237 }
 238
 239 /**
 240  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 241  * @info: fbdev registered by the helper
 242  */
 243 int drm_fb_helper_debug_enter(struct fb_info *info)
 244 {
 245         struct drm_fb_helper *helper = info->par;
 246         const struct drm_crtc_helper_funcs *funcs;
 247         int i;
 248
 249         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 250                 for (i = 0; i < helper->crtc_count; i++) {
 251                         struct drm_mode_set *mode_set =
 252                                 &helper->crtc_info[i].mode_set;
 253
 254                         if (!mode_set->crtc->enabled)
 255                                 continue;
 256
 257                         funcs = mode_set->crtc->helper_private;
 258                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 259                         funcs->mode_set_base_atomic(mode_set->crtc,
 260                                                     mode_set->fb,
 261                                                     mode_set->x,
 262                                                     mode_set->y,
 263                                                     ENTER_ATOMIC_MODE_SET);
 264                 }
 265         }
 266
 267         return 0;
 268 }
 269 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 270
 271 /* Find the real fb for a given fb helper CRTC */
 272 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 273 {
 274         struct drm_device *dev = crtc->dev;
 275         struct drm_crtc *c;
 276
 277         drm_for_each_crtc(c, dev) {
 278                 if (crtc->base.id == c->base.id)
 279                         return c->primary->fb;
 280         }
 281
 282         return NULL;
 283 }
 284
 285 /**
 286  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 287  * @info: fbdev registered by the helper
 288  */
 289 int drm_fb_helper_debug_leave(struct fb_info *info)
 290 {
 291         struct drm_fb_helper *helper = info->par;
 292         struct drm_crtc *crtc;
 293         const struct drm_crtc_helper_funcs *funcs;
 294         struct drm_framebuffer *fb;
 295         int i;
 296
 297         for (i = 0; i < helper->crtc_count; i++) {
 298                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 299                 crtc = mode_set->crtc;
 300                 funcs = crtc->helper_private;
 301                 fb = drm_mode_config_fb(crtc);
 302
 303                 if (!crtc->enabled)
 304                         continue;
 305
 306                 if (!fb) {
 307                         DRM_ERROR("no fb to restore??\n");
 308                         continue;
 309                 }
 310
 311                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 312                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 313                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 314         }
 315
 316         return 0;
 317 }
 318 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 319
 320 static bool restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 321 {
 322         struct drm_device *dev = fb_helper->dev;
 323         struct drm_plane *plane;
 324         bool error = false;
 325         int i;
 326
 327         drm_warn_on_modeset_not_all_locked(dev);
 328
 329         drm_for_each_plane(plane, dev) {
 330                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 331                         drm_plane_force_disable(plane);
 332
 333                 if (dev->mode_config.rotation_property) {
 334                         drm_mode_plane_set_obj_prop(plane,
 335                                                     dev->mode_config.rotation_property,
 336                                                     BIT(DRM_ROTATE_0));
 337                 }
 338         }
 339
 340         for (i = 0; i < fb_helper->crtc_count; i++) {
 341                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 342                 struct drm_crtc *crtc = mode_set->crtc;
 343                 int ret;
 344
 345                 if (crtc->funcs->cursor_set) {
 346                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 347                         if (ret)
 348                                 error = true;
 349                 }
 350
 351                 ret = drm_mode_set_config_internal(mode_set);
 352                 if (ret)
 353                         error = true;
 354         }
 355         return error;
 356 }
 357
 358 /**
 359  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 360  * @fb_helper: fbcon to restore
 361  *
 362  * This should be called from driver's drm ->lastclose callback
 363  * when implementing an fbcon on top of kms using this helper. This ensures that
 364  * the user isn't greeted with a black screen when e.g. X dies.
 365  */
 366 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 367 {
 368         struct drm_device *dev = fb_helper->dev;
 369         bool ret;
 370         bool do_delayed = false;
 371
 372         drm_modeset_lock_all(dev);
 373         ret = restore_fbdev_mode(fb_helper);
 374
 375         do_delayed = fb_helper->delayed_hotplug;
 376         if (do_delayed)
 377                 fb_helper->delayed_hotplug = false;
 378         drm_modeset_unlock_all(dev);
 379
 380         if (do_delayed)
 381                 drm_fb_helper_hotplug_event(fb_helper);
 382         return ret;
 383 }
 384 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 385
 386 /*
 387  * restore fbcon display for all kms driver's using this helper, used for sysrq
 388  * and panic handling.
 389  */
 390 static bool drm_fb_helper_force_kernel_mode(void)
 391 {
 392         bool ret, error = false;
 393         struct drm_fb_helper *helper;
 394
 395         if (list_empty(&kernel_fb_helper_list))
 396                 return false;
 397
 398         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 399                 struct drm_device *dev = helper->dev;
 400
 401                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 402                         continue;
 403
 404                 drm_modeset_lock_all(dev);
 405                 ret = restore_fbdev_mode(helper);
 406                 if (ret)
 407                         error = true;
 408                 drm_modeset_unlock_all(dev);
 409         }
 410         return error;
 411 }
 412
 413 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 414 {
 415         struct drm_device *dev = fb_helper->dev;
 416         struct drm_crtc *crtc;
 417         int bound = 0, crtcs_bound = 0;
 418
 419         /* Sometimes user space wants everything disabled, so don't steal the
 420          * display if there's a master. */
 421         if (dev->primary->master)
 422                 return false;
 423
 424         drm_for_each_crtc(crtc, dev) {
 425                 if (crtc->primary->fb)
 426                         crtcs_bound++;
 427                 if (crtc->primary->fb == fb_helper->fb)
 428                         bound++;
 429         }
 430
 431         if (bound < crtcs_bound)
 432                 return false;
 433
 434         return true;
 435 }
 436
 437 #ifdef CONFIG_MAGIC_SYSRQ
 438 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 439 {
 440         bool ret;
 441         ret = drm_fb_helper_force_kernel_mode();
 442         if (ret == true)
 443                 DRM_ERROR("Failed to restore crtc configuration\n");
 444 }
 445 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 446
 447 static void drm_fb_helper_sysrq(int dummy1)
 448 {
 449         schedule_work(&drm_fb_helper_restore_work);
 450 }
 451
 452 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 453         .handler = drm_fb_helper_sysrq,
 454         .help_msg = "force-fb(V)",
 455         .action_msg = "Restore framebuffer console",
 456 };
 457 #else
 458 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 459 #endif
 460
 461 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 462 {
 463         struct drm_fb_helper *fb_helper = info->par;
 464         struct drm_device *dev = fb_helper->dev;
 465         struct drm_crtc *crtc;
 466         struct drm_connector *connector;
 467         int i, j;
 468
 469         /*
 470          * For each CRTC in this fb, turn the connectors on/off.
 471          */
 472         drm_modeset_lock_all(dev);
 473         if (!drm_fb_helper_is_bound(fb_helper)) {
 474                 drm_modeset_unlock_all(dev);
 475                 return;
 476         }
 477
 478         for (i = 0; i < fb_helper->crtc_count; i++) {
 479                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 480
 481                 if (!crtc->enabled)
 482                         continue;
 483
 484                 /* Walk the connectors & encoders on this fb turning them on/off */
 485                 for (j = 0; j < fb_helper->connector_count; j++) {
 486                         connector = fb_helper->connector_info[j]->connector;
 487                         connector->funcs->dpms(connector, dpms_mode);
 488                         drm_object_property_set_value(&connector->base,
 489                                 dev->mode_config.dpms_property, dpms_mode);
 490                 }
 491         }
 492         drm_modeset_unlock_all(dev);
 493 }
 494
 495 /**
 496  * drm_fb_helper_blank - implementation for ->fb_blank
 497  * @blank: desired blanking state
 498  * @info: fbdev registered by the helper
 499  */
 500 int drm_fb_helper_blank(int blank, struct fb_info *info)
 501 {
 502         if (oops_in_progress)
 503                 return -EBUSY;
 504
 505         switch (blank) {
 506         /* Display: On; HSync: On, VSync: On */
 507         case FB_BLANK_UNBLANK:
 508                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 509                 break;
 510         /* Display: Off; HSync: On, VSync: On */
 511         case FB_BLANK_NORMAL:
 512                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 513                 break;
 514         /* Display: Off; HSync: Off, VSync: On */
 515         case FB_BLANK_HSYNC_SUSPEND:
 516                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 517                 break;
 518         /* Display: Off; HSync: On, VSync: Off */
 519         case FB_BLANK_VSYNC_SUSPEND:
 520                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 521                 break;
 522         /* Display: Off; HSync: Off, VSync: Off */
 523         case FB_BLANK_POWERDOWN:
 524                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 525                 break;
 526         }
 527         return 0;
 528 }
 529 EXPORT_SYMBOL(drm_fb_helper_blank);
 530
 531 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 532 {
 533         int i;
 534
 535         for (i = 0; i < helper->connector_count; i++)
 536                 kfree(helper->connector_info[i]);
 537         kfree(helper->connector_info);
 538         for (i = 0; i < helper->crtc_count; i++) {
 539                 kfree(helper->crtc_info[i].mode_set.connectors);
 540                 if (helper->crtc_info[i].mode_set.mode)
 541                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 542         }
 543         kfree(helper->crtc_info);
 544 }
 545
 546 /**
 547  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 548  * @dev: DRM device
 549  * @helper: driver-allocated fbdev helper structure to set up
 550  * @funcs: pointer to structure of functions associate with this helper
 551  *
 552  * Sets up the bare minimum to make the framebuffer helper usable. This is
 553  * useful to implement race-free initialization of the polling helpers.
 554  */
 555 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 556                            const struct drm_fb_helper_funcs *funcs)
 557 {
 558         INIT_LIST_HEAD(&helper->kernel_fb_list);
 559         helper->funcs = funcs;
 560         helper->dev = dev;
 561 }
 562 EXPORT_SYMBOL(drm_fb_helper_prepare);
 563
 564 /**
 565  * drm_fb_helper_init - initialize a drm_fb_helper structure
 566  * @dev: drm device
 567  * @fb_helper: driver-allocated fbdev helper structure to initialize
 568  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 569  * @max_conn_count: max connector count
 570  *
 571  * This allocates the structures for the fbdev helper with the given limits.
 572  * Note that this won't yet touch the hardware (through the driver interfaces)
 573  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 574  * to allow driver writes more control over the exact init sequence.
 575  *
 576  * Drivers must call drm_fb_helper_prepare() before calling this function.
 577  *
 578  * RETURNS:
 579  * Zero if everything went ok, nonzero otherwise.
 580  */
 581 int drm_fb_helper_init(struct drm_device *dev,
 582                        struct drm_fb_helper *fb_helper,
 583                        int crtc_count, int max_conn_count)
 584 {
 585         struct drm_crtc *crtc;
 586         int i;
 587
 588         if (!max_conn_count)
 589                 return -EINVAL;
 590
 591         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 592         if (!fb_helper->crtc_info)
 593                 return -ENOMEM;
 594
 595         fb_helper->crtc_count = crtc_count;
 596         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 597         if (!fb_helper->connector_info) {
 598                 kfree(fb_helper->crtc_info);
 599                 return -ENOMEM;
 600         }
 601         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 602         fb_helper->connector_count = 0;
 603
 604         for (i = 0; i < crtc_count; i++) {
 605                 fb_helper->crtc_info[i].mode_set.connectors =
 606                         kcalloc(max_conn_count,
 607                                 sizeof(struct drm_connector *),
 608                                 GFP_KERNEL);
 609
 610                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 611                         goto out_free;
 612                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 613         }
 614
 615         i = 0;
 616         drm_for_each_crtc(crtc, dev) {
 617                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 618                 i++;
 619         }
 620
 621         return 0;
 622 out_free:
 623         drm_fb_helper_crtc_free(fb_helper);
 624         return -ENOMEM;
 625 }
 626 EXPORT_SYMBOL(drm_fb_helper_init);
 627
 628 /**
 629  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 630  * @fb_helper: driver-allocated fbdev helper
 631  *
 632  * A helper to alloc fb_info and the members cmap and apertures. Called
 633  * by the driver within the fb_probe fb_helper callback function.
 634  *
 635  * RETURNS:
 636  * fb_info pointer if things went okay, pointer containing error code
 637  * otherwise
 638  */
 639 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 640 {
 641         struct device *dev = fb_helper->dev->dev;
 642         struct fb_info *info;
 643         int ret;
 644
 645         info = framebuffer_alloc(0, dev);
 646         if (!info)
 647                 return ERR_PTR(-ENOMEM);
 648
 649         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 650         if (ret)
 651                 goto err_release;
 652
 653         info->apertures = alloc_apertures(1);
 654         if (!info->apertures) {
 655                 ret = -ENOMEM;
 656                 goto err_free_cmap;
 657         }
 658
 659         fb_helper->fbdev = info;
 660
 661         return info;
 662
 663 err_free_cmap:
 664         fb_dealloc_cmap(&info->cmap);
 665 err_release:
 666         framebuffer_release(info);
 667         return ERR_PTR(ret);
 668 }
 669 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 670
 671 /**
 672  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 673  * @fb_helper: driver-allocated fbdev helper
 674  *
 675  * A wrapper around unregister_framebuffer, to release the fb_info
 676  * framebuffer device
 677  */
 678 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 679 {
 680         if (fb_helper && fb_helper->fbdev)
 681                 unregister_framebuffer(fb_helper->fbdev);
 682 }
 683 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 684
 685 /**
 686  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 687  * @fb_helper: driver-allocated fbdev helper
 688  *
 689  * A helper to free memory taken by fb_info and the members cmap and
 690  * apertures
 691  */
 692 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 693 {
 694         if (fb_helper) {
 695                 struct fb_info *info = fb_helper->fbdev;
 696
 697                 if (info) {
 698                         if (info->cmap.len)
 699                                 fb_dealloc_cmap(&info->cmap);
 700                         framebuffer_release(info);
 701                 }
 702
 703                 fb_helper->fbdev = NULL;
 704         }
 705 }
 706 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 707
 708 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 709 {
 710         if (!list_empty(&fb_helper->kernel_fb_list)) {
 711                 list_del(&fb_helper->kernel_fb_list);
 712                 if (list_empty(&kernel_fb_helper_list)) {
 713                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 714                 }
 715         }
 716
 717         drm_fb_helper_crtc_free(fb_helper);
 718
 719 }
 720 EXPORT_SYMBOL(drm_fb_helper_fini);
 721
 722 /**
 723  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 724  * @fb_helper: driver-allocated fbdev helper
 725  *
 726  * A wrapper around unlink_framebuffer implemented by fbdev core
 727  */
 728 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 729 {
 730         if (fb_helper && fb_helper->fbdev)
 731                 unlink_framebuffer(fb_helper->fbdev);
 732 }
 733 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 734
 735 /**
 736  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 737  * @info: fb_info struct pointer
 738  * @buf: userspace buffer to read from framebuffer memory
 739  * @count: number of bytes to read from framebuffer memory
 740  * @ppos: read offset within framebuffer memory
 741  *
 742  * A wrapper around fb_sys_read implemented by fbdev core
 743  */
 744 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 745                                size_t count, loff_t *ppos)
 746 {
 747         return fb_sys_read(info, buf, count, ppos);
 748 }
 749 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 750
 751 /**
 752  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 753  * @info: fb_info struct pointer
 754  * @buf: userspace buffer to write to framebuffer memory
 755  * @count: number of bytes to write to framebuffer memory
 756  * @ppos: write offset within framebuffer memory
 757  *
 758  * A wrapper around fb_sys_write implemented by fbdev core
 759  */
 760 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 761                                 size_t count, loff_t *ppos)
 762 {
 763         return fb_sys_write(info, buf, count, ppos);
 764 }
 765 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 766
 767 /**
 768  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 769  * @info: fbdev registered by the helper
 770  * @rect: info about rectangle to fill
 771  *
 772  * A wrapper around sys_fillrect implemented by fbdev core
 773  */
 774 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 775                                 const struct fb_fillrect *rect)
 776 {
 777         sys_fillrect(info, rect);
 778 }
 779 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 780
 781 /**
 782  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 783  * @info: fbdev registered by the helper
 784  * @area: info about area to copy
 785  *
 786  * A wrapper around sys_copyarea implemented by fbdev core
 787  */
 788 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 789                                 const struct fb_copyarea *area)
 790 {
 791         sys_copyarea(info, area);
 792 }
 793 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 794
 795 /**
 796  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 797  * @info: fbdev registered by the helper
 798  * @image: info about image to blit
 799  *
 800  * A wrapper around sys_imageblit implemented by fbdev core
 801  */
 802 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 803                                  const struct fb_image *image)
 804 {
 805         sys_imageblit(info, image);
 806 }
 807 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 808
 809 /**
 810  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 811  * @info: fbdev registered by the helper
 812  * @rect: info about rectangle to fill
 813  *
 814  * A wrapper around cfb_imageblit implemented by fbdev core
 815  */
 816 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 817                                 const struct fb_fillrect *rect)
 818 {
 819         cfb_fillrect(info, rect);
 820 }
 821 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 822
 823 /**
 824  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 825  * @info: fbdev registered by the helper
 826  * @area: info about area to copy
 827  *
 828  * A wrapper around cfb_copyarea implemented by fbdev core
 829  */
 830 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 831                                 const struct fb_copyarea *area)
 832 {
 833         cfb_copyarea(info, area);
 834 }
 835 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
 836
 837 /**
 838  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
 839  * @info: fbdev registered by the helper
 840  * @image: info about image to blit
 841  *
 842  * A wrapper around cfb_imageblit implemented by fbdev core
 843  */
 844 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 845                                  const struct fb_image *image)
 846 {
 847         cfb_imageblit(info, image);
 848 }
 849 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
 850
 851 /**
 852  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
 853  * @fb_helper: driver-allocated fbdev helper
 854  * @state: desired state, zero to resume, non-zero to suspend
 855  *
 856  * A wrapper around fb_set_suspend implemented by fbdev core
 857  */
 858 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
 859 {
 860         if (fb_helper && fb_helper->fbdev)
 861                 fb_set_suspend(fb_helper->fbdev, state);
 862 }
 863 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
 864
 865 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 866                      u16 blue, u16 regno, struct fb_info *info)
 867 {
 868         struct drm_fb_helper *fb_helper = info->par;
 869         struct drm_framebuffer *fb = fb_helper->fb;
 870         int pindex;
 871
 872         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 873                 u32 *palette;
 874                 u32 value;
 875                 /* place color in psuedopalette */
 876                 if (regno > 16)
 877                         return -EINVAL;
 878                 palette = (u32 *)info->pseudo_palette;
 879                 red >>= (16 - info->var.red.length);
 880                 green >>= (16 - info->var.green.length);
 881                 blue >>= (16 - info->var.blue.length);
 882                 value = (red << info->var.red.offset) |
 883                         (green << info->var.green.offset) |
 884                         (blue << info->var.blue.offset);
 885                 if (info->var.transp.length > 0) {
 886                         u32 mask = (1 << info->var.transp.length) - 1;
 887                         mask <<= info->var.transp.offset;
 888                         value |= mask;
 889                 }
 890                 palette[regno] = value;
 891                 return 0;
 892         }
 893
 894         /*
 895          * The driver really shouldn't advertise pseudo/directcolor
 896          * visuals if it can't deal with the palette.
 897          */
 898         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 899                     !fb_helper->funcs->gamma_get))
 900                 return -EINVAL;
 901
 902         pindex = regno;
 903
 904         if (fb->bits_per_pixel == 16) {
 905                 pindex = regno << 3;
 906
 907                 if (fb->depth == 16 && regno > 63)
 908                         return -EINVAL;
 909                 if (fb->depth == 15 && regno > 31)
 910                         return -EINVAL;
 911
 912                 if (fb->depth == 16) {
 913                         u16 r, g, b;
 914                         int i;
 915                         if (regno < 32) {
 916                                 for (i = 0; i < 8; i++)
 917                                         fb_helper->funcs->gamma_set(crtc, red,
 918                                                 green, blue, pindex + i);
 919                         }
 920
 921                         fb_helper->funcs->gamma_get(crtc, &r,
 922                                                     &g, &b,
 923                                                     pindex >> 1);
 924
 925                         for (i = 0; i < 4; i++)
 926                                 fb_helper->funcs->gamma_set(crtc, r,
 927                                                             green, b,
 928                                                             (pindex >> 1) + i);
 929                 }
 930         }
 931
 932         if (fb->depth != 16)
 933                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 934         return 0;
 935 }
 936
 937 /**
 938  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 939  * @cmap: cmap to set
 940  * @info: fbdev registered by the helper
 941  */
 942 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 943 {
 944         struct drm_fb_helper *fb_helper = info->par;
 945         struct drm_device *dev = fb_helper->dev;
 946         const struct drm_crtc_helper_funcs *crtc_funcs;
 947         u16 *red, *green, *blue, *transp;
 948         struct drm_crtc *crtc;
 949         int i, j, rc = 0;
 950         int start;
 951
 952         if (oops_in_progress)
 953                 return -EBUSY;
 954
 955         drm_modeset_lock_all(dev);
 956         if (!drm_fb_helper_is_bound(fb_helper)) {
 957                 drm_modeset_unlock_all(dev);
 958                 return -EBUSY;
 959         }
 960
 961         for (i = 0; i < fb_helper->crtc_count; i++) {
 962                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 963                 crtc_funcs = crtc->helper_private;
 964
 965                 red = cmap->red;
 966                 green = cmap->green;
 967                 blue = cmap->blue;
 968                 transp = cmap->transp;
 969                 start = cmap->start;
 970
 971                 for (j = 0; j < cmap->len; j++) {
 972                         u16 hred, hgreen, hblue, htransp = 0xffff;
 973
 974                         hred = *red++;
 975                         hgreen = *green++;
 976                         hblue = *blue++;
 977
 978                         if (transp)
 979                                 htransp = *transp++;
 980
 981                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 982                         if (rc)
 983                                 goto out;
 984                 }
 985                 if (crtc_funcs->load_lut)
 986                         crtc_funcs->load_lut(crtc);
 987         }
 988  out:
 989         drm_modeset_unlock_all(dev);
 990         return rc;
 991 }
 992 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 993
 994 /**
 995  * drm_fb_helper_check_var - implementation for ->fb_check_var
 996  * @var: screeninfo to check
 997  * @info: fbdev registered by the helper
 998  */
 999 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1000                             struct fb_info *info)
1001 {
1002         struct drm_fb_helper *fb_helper = info->par;
1003         struct drm_framebuffer *fb = fb_helper->fb;
1004         int depth;
1005
1006         if (var->pixclock != 0 || in_dbg_master())
1007                 return -EINVAL;
1008
1009         /* Need to resize the fb object !!! */
1010         if (var->bits_per_pixel > fb->bits_per_pixel ||
1011             var->xres > fb->width || var->yres > fb->height ||
1012             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1013                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1014                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1015                           var->xres, var->yres, var->bits_per_pixel,
1016                           var->xres_virtual, var->yres_virtual,
1017                           fb->width, fb->height, fb->bits_per_pixel);
1018                 return -EINVAL;
1019         }
1020
1021         switch (var->bits_per_pixel) {
1022         case 16:
1023                 depth = (var->green.length == 6) ? 16 : 15;
1024                 break;
1025         case 32:
1026                 depth = (var->transp.length > 0) ? 32 : 24;
1027                 break;
1028         default:
1029                 depth = var->bits_per_pixel;
1030                 break;
1031         }
1032
1033         switch (depth) {
1034         case 8:
1035                 var->red.offset = 0;
1036                 var->green.offset = 0;
1037                 var->blue.offset = 0;
1038                 var->red.length = 8;
1039                 var->green.length = 8;
1040                 var->blue.length = 8;
1041                 var->transp.length = 0;
1042                 var->transp.offset = 0;
1043                 break;
1044         case 15:
1045                 var->red.offset = 10;
1046                 var->green.offset = 5;
1047                 var->blue.offset = 0;
1048                 var->red.length = 5;
1049                 var->green.length = 5;
1050                 var->blue.length = 5;
1051                 var->transp.length = 1;
1052                 var->transp.offset = 15;
1053                 break;
1054         case 16:
1055                 var->red.offset = 11;
1056                 var->green.offset = 5;
1057                 var->blue.offset = 0;
1058                 var->red.length = 5;
1059                 var->green.length = 6;
1060                 var->blue.length = 5;
1061                 var->transp.length = 0;
1062                 var->transp.offset = 0;
1063                 break;
1064         case 24:
1065                 var->red.offset = 16;
1066                 var->green.offset = 8;
1067                 var->blue.offset = 0;
1068                 var->red.length = 8;
1069                 var->green.length = 8;
1070                 var->blue.length = 8;
1071                 var->transp.length = 0;
1072                 var->transp.offset = 0;
1073                 break;
1074         case 32:
1075                 var->red.offset = 16;
1076                 var->green.offset = 8;
1077                 var->blue.offset = 0;
1078                 var->red.length = 8;
1079                 var->green.length = 8;
1080                 var->blue.length = 8;
1081                 var->transp.length = 8;
1082                 var->transp.offset = 24;
1083                 break;
1084         default:
1085                 return -EINVAL;
1086         }
1087         return 0;
1088 }
1089 EXPORT_SYMBOL(drm_fb_helper_check_var);
1090
1091 /**
1092  * drm_fb_helper_set_par - implementation for ->fb_set_par
1093  * @info: fbdev registered by the helper
1094  *
1095  * This will let fbcon do the mode init and is called at initialization time by
1096  * the fbdev core when registering the driver, and later on through the hotplug
1097  * callback.
1098  */
1099 int drm_fb_helper_set_par(struct fb_info *info)
1100 {
1101         struct drm_fb_helper *fb_helper = info->par;
1102         struct fb_var_screeninfo *var = &info->var;
1103
1104         if (oops_in_progress)
1105                 return -EBUSY;
1106
1107         if (var->pixclock != 0) {
1108                 DRM_ERROR("PIXEL CLOCK SET\n");
1109                 return -EINVAL;
1110         }
1111
1112         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1113
1114         return 0;
1115 }
1116 EXPORT_SYMBOL(drm_fb_helper_set_par);
1117
1118 /**
1119  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1120  * @var: updated screen information
1121  * @info: fbdev registered by the helper
1122  */
1123 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1124                               struct fb_info *info)
1125 {
1126         struct drm_fb_helper *fb_helper = info->par;
1127         struct drm_device *dev = fb_helper->dev;
1128         struct drm_mode_set *modeset;
1129         int ret = 0;
1130         int i;
1131
1132         if (oops_in_progress)
1133                 return -EBUSY;
1134
1135         drm_modeset_lock_all(dev);
1136         if (!drm_fb_helper_is_bound(fb_helper)) {
1137                 drm_modeset_unlock_all(dev);
1138                 return -EBUSY;
1139         }
1140
1141         for (i = 0; i < fb_helper->crtc_count; i++) {
1142                 modeset = &fb_helper->crtc_info[i].mode_set;
1143
1144                 modeset->x = var->xoffset;
1145                 modeset->y = var->yoffset;
1146
1147                 if (modeset->num_connectors) {
1148                         ret = drm_mode_set_config_internal(modeset);
1149                         if (!ret) {
1150                                 info->var.xoffset = var->xoffset;
1151                                 info->var.yoffset = var->yoffset;
1152                         }
1153                 }
1154         }
1155         drm_modeset_unlock_all(dev);
1156         return ret;
1157 }
1158 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1159
1160 /*
1161  * Allocates the backing storage and sets up the fbdev info structure through
1162  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1163  * notifier.
1164  */
1165 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1166                                          int preferred_bpp)
1167 {
1168         int ret = 0;
1169         int crtc_count = 0;
1170         int i;
1171         struct fb_info *info;
1172         struct drm_fb_helper_surface_size sizes;
1173         int gamma_size = 0;
1174
1175         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1176         sizes.surface_depth = 24;
1177         sizes.surface_bpp = 32;
1178         sizes.fb_width = (unsigned)-1;
1179         sizes.fb_height = (unsigned)-1;
1180
1181         /* if driver picks 8 or 16 by default use that
1182            for both depth/bpp */
1183         if (preferred_bpp != sizes.surface_bpp)
1184                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1185
1186         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1187         for (i = 0; i < fb_helper->connector_count; i++) {
1188                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1189                 struct drm_cmdline_mode *cmdline_mode;
1190
1191                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1192
1193                 if (cmdline_mode->bpp_specified) {
1194                         switch (cmdline_mode->bpp) {
1195                         case 8:
1196                                 sizes.surface_depth = sizes.surface_bpp = 8;
1197                                 break;
1198                         case 15:
1199                                 sizes.surface_depth = 15;
1200                                 sizes.surface_bpp = 16;
1201                                 break;
1202                         case 16:
1203                                 sizes.surface_depth = sizes.surface_bpp = 16;
1204                                 break;
1205                         case 24:
1206                                 sizes.surface_depth = sizes.surface_bpp = 24;
1207                                 break;
1208                         case 32:
1209                                 sizes.surface_depth = 24;
1210                                 sizes.surface_bpp = 32;
1211                                 break;
1212                         }
1213                         break;
1214                 }
1215         }
1216
1217         crtc_count = 0;
1218         for (i = 0; i < fb_helper->crtc_count; i++) {
1219                 struct drm_display_mode *desired_mode;
1220                 struct drm_mode_set *mode_set;
1221                 int x, y, j;
1222                 /* in case of tile group, are we the last tile vert or horiz?
1223                  * If no tile group you are always the last one both vertically
1224                  * and horizontally
1225                  */
1226                 bool lastv = true, lasth = true;
1227
1228                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1229                 mode_set = &fb_helper->crtc_info[i].mode_set;
1230
1231                 if (!desired_mode)
1232                         continue;
1233
1234                 crtc_count++;
1235
1236                 x = fb_helper->crtc_info[i].x;
1237                 y = fb_helper->crtc_info[i].y;
1238
1239                 if (gamma_size == 0)
1240                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1241
1242                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1243                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1244
1245                 for (j = 0; j < mode_set->num_connectors; j++) {
1246                         struct drm_connector *connector = mode_set->connectors[j];
1247                         if (connector->has_tile) {
1248                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1249                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1250                                 /* cloning to multiple tiles is just crazy-talk, so: */
1251                                 break;
1252                         }
1253                 }
1254
1255                 if (lasth)
1256                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1257                 if (lastv)
1258                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1259         }
1260
1261         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1262                 /* hmm everyone went away - assume VGA cable just fell out
1263                    and will come back later. */
1264                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1265                 sizes.fb_width = sizes.surface_width = 1024;
1266                 sizes.fb_height = sizes.surface_height = 768;
1267         }
1268
1269         /* push down into drivers */
1270         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1271         if (ret < 0)
1272                 return ret;
1273
1274         info = fb_helper->fbdev;
1275
1276         /*
1277          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1278          * events, but at init time drm_setup_crtcs needs to be called before
1279          * the fb is allocated (since we need to figure out the desired size of
1280          * the fb before we can allocate it ...). Hence we need to fix things up
1281          * here again.
1282          */
1283         for (i = 0; i < fb_helper->crtc_count; i++)
1284                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1285                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1286
1287
1288         info->var.pixclock = 0;
1289         if (register_framebuffer(info) < 0)
1290                 return -EINVAL;
1291
1292         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1293                         info->node, info->fix.id);
1294
1295         if (list_empty(&kernel_fb_helper_list)) {
1296                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1297         }
1298
1299         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1300
1301         return 0;
1302 }
1303
1304 /**
1305  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1306  * @info: fbdev registered by the helper
1307  * @pitch: desired pitch
1308  * @depth: desired depth
1309  *
1310  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1311  * fbdev emulations. Drivers which support acceleration methods which impose
1312  * additional constraints need to set up their own limits.
1313  *
1314  * Drivers should call this (or their equivalent setup code) from their
1315  * ->fb_probe callback.
1316  */
1317 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1318                             uint32_t depth)
1319 {
1320         info->fix.type = FB_TYPE_PACKED_PIXELS;
1321         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1322                 FB_VISUAL_TRUECOLOR;
1323         info->fix.mmio_start = 0;
1324         info->fix.mmio_len = 0;
1325         info->fix.type_aux = 0;
1326         info->fix.xpanstep = 1; /* doing it in hw */
1327         info->fix.ypanstep = 1; /* doing it in hw */
1328         info->fix.ywrapstep = 0;
1329         info->fix.accel = FB_ACCEL_NONE;
1330
1331         info->fix.line_length = pitch;
1332         return;
1333 }
1334 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1335
1336 /**
1337  * drm_fb_helper_fill_var - initalizes variable fbdev information
1338  * @info: fbdev instance to set up
1339  * @fb_helper: fb helper instance to use as template
1340  * @fb_width: desired fb width
1341  * @fb_height: desired fb height
1342  *
1343  * Sets up the variable fbdev metainformation from the given fb helper instance
1344  * and the drm framebuffer allocated in fb_helper->fb.
1345  *
1346  * Drivers should call this (or their equivalent setup code) from their
1347  * ->fb_probe callback after having allocated the fbdev backing
1348  * storage framebuffer.
1349  */
1350 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1351                             uint32_t fb_width, uint32_t fb_height)
1352 {
1353         struct drm_framebuffer *fb = fb_helper->fb;
1354         info->pseudo_palette = fb_helper->pseudo_palette;
1355         info->var.xres_virtual = fb->width;
1356         info->var.yres_virtual = fb->height;
1357         info->var.bits_per_pixel = fb->bits_per_pixel;
1358         info->var.accel_flags = FB_ACCELF_TEXT;
1359         info->var.xoffset = 0;
1360         info->var.yoffset = 0;
1361         info->var.activate = FB_ACTIVATE_NOW;
1362         info->var.height = -1;
1363         info->var.width = -1;
1364
1365         switch (fb->depth) {
1366         case 8:
1367                 info->var.red.offset = 0;
1368                 info->var.green.offset = 0;
1369                 info->var.blue.offset = 0;
1370                 info->var.red.length = 8; /* 8bit DAC */
1371                 info->var.green.length = 8;
1372                 info->var.blue.length = 8;
1373                 info->var.transp.offset = 0;
1374                 info->var.transp.length = 0;
1375                 break;
1376         case 15:
1377                 info->var.red.offset = 10;
1378                 info->var.green.offset = 5;
1379                 info->var.blue.offset = 0;
1380                 info->var.red.length = 5;
1381                 info->var.green.length = 5;
1382                 info->var.blue.length = 5;
1383                 info->var.transp.offset = 15;
1384                 info->var.transp.length = 1;
1385                 break;
1386         case 16:
1387                 info->var.red.offset = 11;
1388                 info->var.green.offset = 5;
1389                 info->var.blue.offset = 0;
1390                 info->var.red.length = 5;
1391                 info->var.green.length = 6;
1392                 info->var.blue.length = 5;
1393                 info->var.transp.offset = 0;
1394                 break;
1395         case 24:
1396                 info->var.red.offset = 16;
1397                 info->var.green.offset = 8;
1398                 info->var.blue.offset = 0;
1399                 info->var.red.length = 8;
1400                 info->var.green.length = 8;
1401                 info->var.blue.length = 8;
1402                 info->var.transp.offset = 0;
1403                 info->var.transp.length = 0;
1404                 break;
1405         case 32:
1406                 info->var.red.offset = 16;
1407                 info->var.green.offset = 8;
1408                 info->var.blue.offset = 0;
1409                 info->var.red.length = 8;
1410                 info->var.green.length = 8;
1411                 info->var.blue.length = 8;
1412                 info->var.transp.offset = 24;
1413                 info->var.transp.length = 8;
1414                 break;
1415         default:
1416                 break;
1417         }
1418
1419         info->var.xres = fb_width;
1420         info->var.yres = fb_height;
1421 }
1422 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1423
1424 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1425                                                uint32_t maxX,
1426                                                uint32_t maxY)
1427 {
1428         struct drm_connector *connector;
1429         int count = 0;
1430         int i;
1431
1432         for (i = 0; i < fb_helper->connector_count; i++) {
1433                 connector = fb_helper->connector_info[i]->connector;
1434                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1435         }
1436
1437         return count;
1438 }
1439
1440 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1441 {
1442         struct drm_display_mode *mode;
1443
1444         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1445                 if (mode->hdisplay > width ||
1446                     mode->vdisplay > height)
1447                         continue;
1448                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1449                         return mode;
1450         }
1451         return NULL;
1452 }
1453 EXPORT_SYMBOL(drm_has_preferred_mode);
1454
1455 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1456 {
1457         return fb_connector->connector->cmdline_mode.specified;
1458 }
1459
1460 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1461                                                       int width, int height)
1462 {
1463         struct drm_cmdline_mode *cmdline_mode;
1464         struct drm_display_mode *mode;
1465         bool prefer_non_interlace;
1466
1467         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1468         if (cmdline_mode->specified == false)
1469                 return NULL;
1470
1471         /* attempt to find a matching mode in the list of modes
1472          *  we have gotten so far, if not add a CVT mode that conforms
1473          */
1474         if (cmdline_mode->rb || cmdline_mode->margins)
1475                 goto create_mode;
1476
1477         prefer_non_interlace = !cmdline_mode->interlace;
1478 again:
1479         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1480                 /* check width/height */
1481                 if (mode->hdisplay != cmdline_mode->xres ||
1482                     mode->vdisplay != cmdline_mode->yres)
1483                         continue;
1484
1485                 if (cmdline_mode->refresh_specified) {
1486                         if (mode->vrefresh != cmdline_mode->refresh)
1487                                 continue;
1488                 }
1489
1490                 if (cmdline_mode->interlace) {
1491                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1492                                 continue;
1493                 } else if (prefer_non_interlace) {
1494                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1495                                 continue;
1496                 }
1497                 return mode;
1498         }
1499
1500         if (prefer_non_interlace) {
1501                 prefer_non_interlace = false;
1502                 goto again;
1503         }
1504
1505 create_mode:
1506         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1507                                                  cmdline_mode);
1508         list_add(&mode->head, &fb_helper_conn->connector->modes);
1509         return mode;
1510 }
1511 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1512
1513 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1514 {
1515         bool enable;
1516
1517         if (strict)
1518                 enable = connector->status == connector_status_connected;
1519         else
1520                 enable = connector->status != connector_status_disconnected;
1521
1522         return enable;
1523 }
1524
1525 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1526                                   bool *enabled)
1527 {
1528         bool any_enabled = false;
1529         struct drm_connector *connector;
1530         int i = 0;
1531
1532         for (i = 0; i < fb_helper->connector_count; i++) {
1533                 connector = fb_helper->connector_info[i]->connector;
1534                 enabled[i] = drm_connector_enabled(connector, true);
1535                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1536                           enabled[i] ? "yes" : "no");
1537                 any_enabled |= enabled[i];
1538         }
1539
1540         if (any_enabled)
1541                 return;
1542
1543         for (i = 0; i < fb_helper->connector_count; i++) {
1544                 connector = fb_helper->connector_info[i]->connector;
1545                 enabled[i] = drm_connector_enabled(connector, false);
1546         }
1547 }
1548
1549 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1550                               struct drm_display_mode **modes,
1551                               struct drm_fb_offset *offsets,
1552                               bool *enabled, int width, int height)
1553 {
1554         int count, i, j;
1555         bool can_clone = false;
1556         struct drm_fb_helper_connector *fb_helper_conn;
1557         struct drm_display_mode *dmt_mode, *mode;
1558
1559         /* only contemplate cloning in the single crtc case */
1560         if (fb_helper->crtc_count > 1)
1561                 return false;
1562
1563         count = 0;
1564         for (i = 0; i < fb_helper->connector_count; i++) {
1565                 if (enabled[i])
1566                         count++;
1567         }
1568
1569         /* only contemplate cloning if more than one connector is enabled */
1570         if (count <= 1)
1571                 return false;
1572
1573         /* check the command line or if nothing common pick 1024x768 */
1574         can_clone = true;
1575         for (i = 0; i < fb_helper->connector_count; i++) {
1576                 if (!enabled[i])
1577                         continue;
1578                 fb_helper_conn = fb_helper->connector_info[i];
1579                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1580                 if (!modes[i]) {
1581                         can_clone = false;
1582                         break;
1583                 }
1584                 for (j = 0; j < i; j++) {
1585                         if (!enabled[j])
1586                                 continue;
1587                         if (!drm_mode_equal(modes[j], modes[i]))
1588                                 can_clone = false;
1589                 }
1590         }
1591
1592         if (can_clone) {
1593                 DRM_DEBUG_KMS("can clone using command line\n");
1594                 return true;
1595         }
1596
1597         /* try and find a 1024x768 mode on each connector */
1598         can_clone = true;
1599         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1600
1601         for (i = 0; i < fb_helper->connector_count; i++) {
1602
1603                 if (!enabled[i])
1604                         continue;
1605
1606                 fb_helper_conn = fb_helper->connector_info[i];
1607                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1608                         if (drm_mode_equal(mode, dmt_mode))
1609                                 modes[i] = mode;
1610                 }
1611                 if (!modes[i])
1612                         can_clone = false;
1613         }
1614
1615         if (can_clone) {
1616                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1617                 return true;
1618         }
1619         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1620         return false;
1621 }
1622
1623 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1624                                 struct drm_display_mode **modes,
1625                                 struct drm_fb_offset *offsets,
1626                                 int idx,
1627                                 int h_idx, int v_idx)
1628 {
1629         struct drm_fb_helper_connector *fb_helper_conn;
1630         int i;
1631         int hoffset = 0, voffset = 0;
1632
1633         for (i = 0; i < fb_helper->connector_count; i++) {
1634                 fb_helper_conn = fb_helper->connector_info[i];
1635                 if (!fb_helper_conn->connector->has_tile)
1636                         continue;
1637
1638                 if (!modes[i] && (h_idx || v_idx)) {
1639                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1640                                       fb_helper_conn->connector->base.id);
1641                         continue;
1642                 }
1643                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1644                         hoffset += modes[i]->hdisplay;
1645
1646                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1647                         voffset += modes[i]->vdisplay;
1648         }
1649         offsets[idx].x = hoffset;
1650         offsets[idx].y = voffset;
1651         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1652         return 0;
1653 }
1654
1655 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1656                                  struct drm_display_mode **modes,
1657                                  struct drm_fb_offset *offsets,
1658                                  bool *enabled, int width, int height)
1659 {
1660         struct drm_fb_helper_connector *fb_helper_conn;
1661         int i;
1662         uint64_t conn_configured = 0, mask;
1663         int tile_pass = 0;
1664         mask = (1 << fb_helper->connector_count) - 1;
1665 retry:
1666         for (i = 0; i < fb_helper->connector_count; i++) {
1667                 fb_helper_conn = fb_helper->connector_info[i];
1668
1669                 if (conn_configured & (1 << i))
1670                         continue;
1671
1672                 if (enabled[i] == false) {
1673                         conn_configured |= (1 << i);
1674                         continue;
1675                 }
1676
1677                 /* first pass over all the untiled connectors */
1678                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1679                         continue;
1680
1681                 if (tile_pass == 1) {
1682                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1683                             fb_helper_conn->connector->tile_v_loc != 0)
1684                                 continue;
1685
1686                 } else {
1687                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1688                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1689                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1690                                 continue;
1691
1692                         /* find the tile offsets for this pass - need
1693                            to find all tiles left and above */
1694                         drm_get_tile_offsets(fb_helper, modes, offsets,
1695                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1696                 }
1697                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1698                               fb_helper_conn->connector->base.id);
1699
1700                 /* got for command line mode first */
1701                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1702                 if (!modes[i]) {
1703                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1704                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1705                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1706                 }
1707                 /* No preferred modes, pick one off the list */
1708                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1709                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1710                                 break;
1711                 }
1712                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1713                           "none");
1714                 conn_configured |= (1 << i);
1715         }
1716
1717         if ((conn_configured & mask) != mask) {
1718                 tile_pass++;
1719                 goto retry;
1720         }
1721         return true;
1722 }
1723
1724 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1725                           struct drm_fb_helper_crtc **best_crtcs,
1726                           struct drm_display_mode **modes,
1727                           int n, int width, int height)
1728 {
1729         int c, o;
1730         struct drm_device *dev = fb_helper->dev;
1731         struct drm_connector *connector;
1732         const struct drm_connector_helper_funcs *connector_funcs;
1733         struct drm_encoder *encoder;
1734         int my_score, best_score, score;
1735         struct drm_fb_helper_crtc **crtcs, *crtc;
1736         struct drm_fb_helper_connector *fb_helper_conn;
1737
1738         if (n == fb_helper->connector_count)
1739                 return 0;
1740
1741         fb_helper_conn = fb_helper->connector_info[n];
1742         connector = fb_helper_conn->connector;
1743
1744         best_crtcs[n] = NULL;
1745         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1746         if (modes[n] == NULL)
1747                 return best_score;
1748
1749         crtcs = kzalloc(dev->mode_config.num_connector *
1750                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1751         if (!crtcs)
1752                 return best_score;
1753
1754         my_score = 1;
1755         if (connector->status == connector_status_connected)
1756                 my_score++;
1757         if (drm_has_cmdline_mode(fb_helper_conn))
1758                 my_score++;
1759         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1760                 my_score++;
1761
1762         connector_funcs = connector->helper_private;
1763         encoder = connector_funcs->best_encoder(connector);
1764         if (!encoder)
1765                 goto out;
1766
1767         /* select a crtc for this connector and then attempt to configure
1768            remaining connectors */
1769         for (c = 0; c < fb_helper->crtc_count; c++) {
1770                 crtc = &fb_helper->crtc_info[c];
1771
1772                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1773                         continue;
1774
1775                 for (o = 0; o < n; o++)
1776                         if (best_crtcs[o] == crtc)
1777                                 break;
1778
1779                 if (o < n) {
1780                         /* ignore cloning unless only a single crtc */
1781                         if (fb_helper->crtc_count > 1)
1782                                 continue;
1783
1784                         if (!drm_mode_equal(modes[o], modes[n]))
1785                                 continue;
1786                 }
1787
1788                 crtcs[n] = crtc;
1789                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1790                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1791                                                   width, height);
1792                 if (score > best_score) {
1793                         best_score = score;
1794                         memcpy(best_crtcs, crtcs,
1795                                dev->mode_config.num_connector *
1796                                sizeof(struct drm_fb_helper_crtc *));
1797                 }
1798         }
1799 out:
1800         kfree(crtcs);
1801         return best_score;
1802 }
1803
1804 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1805 {
1806         struct drm_device *dev = fb_helper->dev;
1807         struct drm_fb_helper_crtc **crtcs;
1808         struct drm_display_mode **modes;
1809         struct drm_fb_offset *offsets;
1810         struct drm_mode_set *modeset;
1811         bool *enabled;
1812         int width, height;
1813         int i;
1814
1815         DRM_DEBUG_KMS("\n");
1816
1817         width = dev->mode_config.max_width;
1818         height = dev->mode_config.max_height;
1819
1820         crtcs = kcalloc(dev->mode_config.num_connector,
1821                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1822         modes = kcalloc(dev->mode_config.num_connector,
1823                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1824         offsets = kcalloc(dev->mode_config.num_connector,
1825                           sizeof(struct drm_fb_offset), GFP_KERNEL);
1826         enabled = kcalloc(dev->mode_config.num_connector,
1827                           sizeof(bool), GFP_KERNEL);
1828         if (!crtcs || !modes || !enabled || !offsets) {
1829                 DRM_ERROR("Memory allocation failed\n");
1830                 goto out;
1831         }
1832
1833
1834         drm_enable_connectors(fb_helper, enabled);
1835
1836         if (!(fb_helper->funcs->initial_config &&
1837               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1838                                                offsets,
1839                                                enabled, width, height))) {
1840                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1841                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1842                 memset(offsets, 0, dev->mode_config.num_connector*sizeof(offsets[0]));
1843
1844                 if (!drm_target_cloned(fb_helper, modes, offsets,
1845                                        enabled, width, height) &&
1846                     !drm_target_preferred(fb_helper, modes, offsets,
1847                                           enabled, width, height))
1848                         DRM_ERROR("Unable to find initial modes\n");
1849
1850                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1851                               width, height);
1852
1853                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1854         }
1855
1856         /* need to set the modesets up here for use later */
1857         /* fill out the connector<->crtc mappings into the modesets */
1858         for (i = 0; i < fb_helper->crtc_count; i++) {
1859                 modeset = &fb_helper->crtc_info[i].mode_set;
1860                 modeset->num_connectors = 0;
1861                 modeset->fb = NULL;
1862         }
1863
1864         for (i = 0; i < fb_helper->connector_count; i++) {
1865                 struct drm_display_mode *mode = modes[i];
1866                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1867                 struct drm_fb_offset *offset = &offsets[i];
1868                 modeset = &fb_crtc->mode_set;
1869
1870                 if (mode && fb_crtc) {
1871                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
1872                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
1873                         fb_crtc->desired_mode = mode;
1874                         fb_crtc->x = offset->x;
1875                         fb_crtc->y = offset->y;
1876                         if (modeset->mode)
1877                                 drm_mode_destroy(dev, modeset->mode);
1878                         modeset->mode = drm_mode_duplicate(dev,
1879                                                            fb_crtc->desired_mode);
1880                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1881                         modeset->fb = fb_helper->fb;
1882                         modeset->x = offset->x;
1883                         modeset->y = offset->y;
1884                 }
1885         }
1886
1887         /* Clear out any old modes if there are no more connected outputs. */
1888         for (i = 0; i < fb_helper->crtc_count; i++) {
1889                 modeset = &fb_helper->crtc_info[i].mode_set;
1890                 if (modeset->num_connectors == 0) {
1891                         BUG_ON(modeset->fb);
1892                         if (modeset->mode)
1893                                 drm_mode_destroy(dev, modeset->mode);
1894                         modeset->mode = NULL;
1895                 }
1896         }
1897 out:
1898         kfree(crtcs);
1899         kfree(modes);
1900         kfree(offsets);
1901         kfree(enabled);
1902 }
1903
1904 /**
1905  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1906  * @fb_helper: fb_helper device struct
1907  * @bpp_sel: bpp value to use for the framebuffer configuration
1908  *
1909  * Scans the CRTCs and connectors and tries to put together an initial setup.
1910  * At the moment, this is a cloned configuration across all heads with
1911  * a new framebuffer object as the backing store.
1912  *
1913  * Note that this also registers the fbdev and so allows userspace to call into
1914  * the driver through the fbdev interfaces.
1915  *
1916  * This function will call down into the ->fb_probe callback to let
1917  * the driver allocate and initialize the fbdev info structure and the drm
1918  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1919  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1920  * values for the fbdev info structure.
1921  *
1922  * RETURNS:
1923  * Zero if everything went ok, nonzero otherwise.
1924  */
1925 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1926 {
1927         struct drm_device *dev = fb_helper->dev;
1928         int count = 0;
1929
1930         mutex_lock(&dev->mode_config.mutex);
1931         count = drm_fb_helper_probe_connector_modes(fb_helper,
1932                                                     dev->mode_config.max_width,
1933                                                     dev->mode_config.max_height);
1934         mutex_unlock(&dev->mode_config.mutex);
1935         /*
1936          * we shouldn't end up with no modes here.
1937          */
1938         if (count == 0)
1939                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1940
1941         drm_setup_crtcs(fb_helper);
1942
1943         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1944 }
1945 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1946
1947 /**
1948  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1949  *                               probing all the outputs attached to the fb
1950  * @fb_helper: the drm_fb_helper
1951  *
1952  * Scan the connectors attached to the fb_helper and try to put together a
1953  * setup after *notification of a change in output configuration.
1954  *
1955  * Called at runtime, takes the mode config locks to be able to check/change the
1956  * modeset configuration. Must be run from process context (which usually means
1957  * either the output polling work or a work item launched from the driver's
1958  * hotplug interrupt).
1959  *
1960  * Note that drivers may call this even before calling
1961  * drm_fb_helper_initial_config but only aftert drm_fb_helper_init. This allows
1962  * for a race-free fbcon setup and will make sure that the fbdev emulation will
1963  * not miss any hotplug events.
1964  *
1965  * RETURNS:
1966  * 0 on success and a non-zero error code otherwise.
1967  */
1968 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1969 {
1970         struct drm_device *dev = fb_helper->dev;
1971         u32 max_width, max_height;
1972
1973         mutex_lock(&fb_helper->dev->mode_config.mutex);
1974         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
1975                 fb_helper->delayed_hotplug = true;
1976                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1977                 return 0;
1978         }
1979         DRM_DEBUG_KMS("\n");
1980
1981         max_width = fb_helper->fb->width;
1982         max_height = fb_helper->fb->height;
1983
1984         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1985         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1986
1987         drm_modeset_lock_all(dev);
1988         drm_setup_crtcs(fb_helper);
1989         drm_modeset_unlock_all(dev);
1990         drm_fb_helper_set_par(fb_helper->fbdev);
1991
1992         return 0;
1993 }
1994 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1995
1996 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1997  * but the module doesn't depend on any fb console symbols.  At least
1998  * attempt to load fbcon to avoid leaving the system without a usable console.
1999  */
2000 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2001 static int __init drm_fb_helper_modinit(void)
2002 {
2003         const char *name = "fbcon";
2004         struct module *fbcon;
2005
2006         mutex_lock(&module_mutex);
2007         fbcon = find_module(name);
2008         mutex_unlock(&module_mutex);
2009
2010         if (!fbcon)
2011                 request_module_nowait(name);
2012         return 0;
2013 }
2014
2015 module_init(drm_fb_helper_modinit);
2016 #endif