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/console.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/slab.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 #include <drm/drm_atomic.h>
  42 #include <drm/drm_atomic_helper.h>
  43
  44 #include "drm_crtc_helper_internal.h"
  45
  46 static bool drm_fbdev_emulation = true;
  47 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
  48 MODULE_PARM_DESC(fbdev_emulation,
  49                  "Enable legacy fbdev emulation [default=true]");
  50
  51 static LIST_HEAD(kernel_fb_helper_list);
  52
  53 /**
  54  * DOC: fbdev helpers
  55  *
  56  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  57  * mode setting driver. They can be used mostly independently from the crtc
  58  * helper functions used by many drivers to implement the kernel mode setting
  59  * interfaces.
  60  *
  61  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  62  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  63  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  64  * default behaviour can override the third step with their own code.
  65  * Teardown is done with drm_fb_helper_fini().
  66  *
  67  * At runtime drivers should restore the fbdev console by calling
  68  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  69  * They should also notify the fb helper code from updates to the output
  70  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  71  * integration with the output polling code in drm_crtc_helper.c the modeset
  72  * code provides a ->output_poll_changed callback.
  73  *
  74  * All other functions exported by the fb helper library can be used to
  75  * implement the fbdev driver interface by the driver.
  76  *
  77  * It is possible, though perhaps somewhat tricky, to implement race-free
  78  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  79  * helper must be called first to initialize the minimum required to make
  80  * hotplug detection work. Drivers also need to make sure to properly set up
  81  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  82  * it is safe to enable interrupts and start processing hotplug events. At the
  83  * same time, drivers should initialize all modeset objects such as CRTCs,
  84  * encoders and connectors. To finish up the fbdev helper initialization, the
  85  * drm_fb_helper_init() function is called. To probe for all attached displays
  86  * and set up an initial configuration using the detected hardware, drivers
  87  * should call drm_fb_helper_single_add_all_connectors() followed by
  88  * drm_fb_helper_initial_config().
  89  *
  90  * If &drm_framebuffer_funcs ->dirty is set, the
  91  * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
  92  * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
  93  * away. This worker then calls the dirty() function ensuring that it will
  94  * always run in process context since the fb_*() function could be running in
  95  * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
  96  * callback it will also schedule dirty_work with the damage collected from the
  97  * mmap page writes.
  98  */
  99
 100 /**
 101  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
 102  *                                             emulation helper
 103  * @fb_helper: fbdev initialized with drm_fb_helper_init
 104  *
 105  * This functions adds all the available connectors for use with the given
 106  * fb_helper. This is a separate step to allow drivers to freely assign
 107  * connectors to the fbdev, e.g. if some are reserved for special purposes or
 108  * not adequate to be used for the fbcon.
 109  *
 110  * This function is protected against concurrent connector hotadds/removals
 111  * using drm_fb_helper_add_one_connector() and
 112  * drm_fb_helper_remove_one_connector().
 113  */
 114 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 115 {
 116         struct drm_device *dev = fb_helper->dev;
 117         struct drm_connector *connector;
 118         int i, ret;
 119
 120         if (!drm_fbdev_emulation)
 121                 return 0;
 122
 123         mutex_lock(&dev->mode_config.mutex);
 124         drm_for_each_connector(connector, dev) {
 125                 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
 126
 127                 if (ret)
 128                         goto fail;
 129         }
 130         mutex_unlock(&dev->mode_config.mutex);
 131         return 0;
 132 fail:
 133         for (i = 0; i < fb_helper->connector_count; i++) {
 134                 struct drm_fb_helper_connector *fb_helper_connector =
 135                         fb_helper->connector_info[i];
 136
 137                 drm_connector_unreference(fb_helper_connector->connector);
 138
 139                 kfree(fb_helper_connector);
 140                 fb_helper->connector_info[i] = NULL;
 141         }
 142         fb_helper->connector_count = 0;
 143         mutex_unlock(&dev->mode_config.mutex);
 144
 145         return ret;
 146 }
 147 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 148
 149 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 150 {
 151         struct drm_fb_helper_connector **temp;
 152         struct drm_fb_helper_connector *fb_helper_connector;
 153
 154         if (!drm_fbdev_emulation)
 155                 return 0;
 156
 157         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 158         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 159                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 160                 if (!temp)
 161                         return -ENOMEM;
 162
 163                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 164                 fb_helper->connector_info = temp;
 165         }
 166
 167
 168         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 169         if (!fb_helper_connector)
 170                 return -ENOMEM;
 171
 172         drm_connector_reference(connector);
 173         fb_helper_connector->connector = connector;
 174         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 175         return 0;
 176 }
 177 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 178
 179 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 180                                        struct drm_connector *connector)
 181 {
 182         struct drm_fb_helper_connector *fb_helper_connector;
 183         int i, j;
 184
 185         if (!drm_fbdev_emulation)
 186                 return 0;
 187
 188         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 189
 190         for (i = 0; i < fb_helper->connector_count; i++) {
 191                 if (fb_helper->connector_info[i]->connector == connector)
 192                         break;
 193         }
 194
 195         if (i == fb_helper->connector_count)
 196                 return -EINVAL;
 197         fb_helper_connector = fb_helper->connector_info[i];
 198         drm_connector_unreference(fb_helper_connector->connector);
 199
 200         for (j = i + 1; j < fb_helper->connector_count; j++) {
 201                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 202         }
 203         fb_helper->connector_count--;
 204         kfree(fb_helper_connector);
 205
 206         return 0;
 207 }
 208 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 209
 210 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 211 {
 212         uint16_t *r_base, *g_base, *b_base;
 213         int i;
 214
 215         if (helper->funcs->gamma_get == NULL)
 216                 return;
 217
 218         r_base = crtc->gamma_store;
 219         g_base = r_base + crtc->gamma_size;
 220         b_base = g_base + crtc->gamma_size;
 221
 222         for (i = 0; i < crtc->gamma_size; i++)
 223                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 224 }
 225
 226 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 227 {
 228         uint16_t *r_base, *g_base, *b_base;
 229
 230         if (crtc->funcs->gamma_set == NULL)
 231                 return;
 232
 233         r_base = crtc->gamma_store;
 234         g_base = r_base + crtc->gamma_size;
 235         b_base = g_base + crtc->gamma_size;
 236
 237         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
 238 }
 239
 240 /**
 241  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 242  * @info: fbdev registered by the helper
 243  */
 244 int drm_fb_helper_debug_enter(struct fb_info *info)
 245 {
 246         struct drm_fb_helper *helper = info->par;
 247         const struct drm_crtc_helper_funcs *funcs;
 248         int i;
 249
 250         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 251                 for (i = 0; i < helper->crtc_count; i++) {
 252                         struct drm_mode_set *mode_set =
 253                                 &helper->crtc_info[i].mode_set;
 254
 255                         if (!mode_set->crtc->enabled)
 256                                 continue;
 257
 258                         funcs = mode_set->crtc->helper_private;
 259                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 260                         funcs->mode_set_base_atomic(mode_set->crtc,
 261                                                     mode_set->fb,
 262                                                     mode_set->x,
 263                                                     mode_set->y,
 264                                                     ENTER_ATOMIC_MODE_SET);
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 271
 272 /* Find the real fb for a given fb helper CRTC */
 273 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 274 {
 275         struct drm_device *dev = crtc->dev;
 276         struct drm_crtc *c;
 277
 278         drm_for_each_crtc(c, dev) {
 279                 if (crtc->base.id == c->base.id)
 280                         return c->primary->fb;
 281         }
 282
 283         return NULL;
 284 }
 285
 286 /**
 287  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 288  * @info: fbdev registered by the helper
 289  */
 290 int drm_fb_helper_debug_leave(struct fb_info *info)
 291 {
 292         struct drm_fb_helper *helper = info->par;
 293         struct drm_crtc *crtc;
 294         const struct drm_crtc_helper_funcs *funcs;
 295         struct drm_framebuffer *fb;
 296         int i;
 297
 298         for (i = 0; i < helper->crtc_count; i++) {
 299                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 300                 crtc = mode_set->crtc;
 301                 funcs = crtc->helper_private;
 302                 fb = drm_mode_config_fb(crtc);
 303
 304                 if (!crtc->enabled)
 305                         continue;
 306
 307                 if (!fb) {
 308                         DRM_ERROR("no fb to restore??\n");
 309                         continue;
 310                 }
 311
 312                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 313                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 314                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 315         }
 316
 317         return 0;
 318 }
 319 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 320
 321 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 322 {
 323         struct drm_device *dev = fb_helper->dev;
 324         struct drm_plane *plane;
 325         struct drm_atomic_state *state;
 326         int i, ret;
 327         unsigned plane_mask;
 328
 329         state = drm_atomic_state_alloc(dev);
 330         if (!state)
 331                 return -ENOMEM;
 332
 333         state->acquire_ctx = dev->mode_config.acquire_ctx;
 334 retry:
 335         plane_mask = 0;
 336         drm_for_each_plane(plane, dev) {
 337                 struct drm_plane_state *plane_state;
 338
 339                 plane_state = drm_atomic_get_plane_state(state, plane);
 340                 if (IS_ERR(plane_state)) {
 341                         ret = PTR_ERR(plane_state);
 342                         goto fail;
 343                 }
 344
 345                 plane_state->rotation = DRM_ROTATE_0;
 346
 347                 plane->old_fb = plane->fb;
 348                 plane_mask |= 1 << drm_plane_index(plane);
 349
 350                 /* disable non-primary: */
 351                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 352                         continue;
 353
 354                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
 355                 if (ret != 0)
 356                         goto fail;
 357         }
 358
 359         for(i = 0; i < fb_helper->crtc_count; i++) {
 360                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 361
 362                 ret = __drm_atomic_helper_set_config(mode_set, state);
 363                 if (ret != 0)
 364                         goto fail;
 365         }
 366
 367         ret = drm_atomic_commit(state);
 368
 369 fail:
 370         drm_atomic_clean_old_fb(dev, plane_mask, ret);
 371
 372         if (ret == -EDEADLK)
 373                 goto backoff;
 374
 375         if (ret != 0)
 376                 drm_atomic_state_free(state);
 377
 378         return ret;
 379
 380 backoff:
 381         drm_atomic_state_clear(state);
 382         drm_atomic_legacy_backoff(state);
 383
 384         goto retry;
 385 }
 386
 387 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 388 {
 389         struct drm_device *dev = fb_helper->dev;
 390         struct drm_plane *plane;
 391         int i;
 392
 393         drm_warn_on_modeset_not_all_locked(dev);
 394
 395         if (dev->mode_config.funcs->atomic_commit)
 396                 return restore_fbdev_mode_atomic(fb_helper);
 397
 398         drm_for_each_plane(plane, dev) {
 399                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 400                         drm_plane_force_disable(plane);
 401
 402                 if (dev->mode_config.rotation_property) {
 403                         drm_mode_plane_set_obj_prop(plane,
 404                                                     dev->mode_config.rotation_property,
 405                                                     DRM_ROTATE_0);
 406                 }
 407         }
 408
 409         for (i = 0; i < fb_helper->crtc_count; i++) {
 410                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 411                 struct drm_crtc *crtc = mode_set->crtc;
 412                 int ret;
 413
 414                 if (crtc->funcs->cursor_set2) {
 415                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
 416                         if (ret)
 417                                 return ret;
 418                 } else if (crtc->funcs->cursor_set) {
 419                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 420                         if (ret)
 421                                 return ret;
 422                 }
 423
 424                 ret = drm_mode_set_config_internal(mode_set);
 425                 if (ret)
 426                         return ret;
 427         }
 428
 429         return 0;
 430 }
 431
 432 /**
 433  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 434  * @fb_helper: fbcon to restore
 435  *
 436  * This should be called from driver's drm ->lastclose callback
 437  * when implementing an fbcon on top of kms using this helper. This ensures that
 438  * the user isn't greeted with a black screen when e.g. X dies.
 439  *
 440  * RETURNS:
 441  * Zero if everything went ok, negative error code otherwise.
 442  */
 443 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 444 {
 445         struct drm_device *dev = fb_helper->dev;
 446         bool do_delayed;
 447         int ret;
 448
 449         if (!drm_fbdev_emulation)
 450                 return -ENODEV;
 451
 452         drm_modeset_lock_all(dev);
 453         ret = restore_fbdev_mode(fb_helper);
 454
 455         do_delayed = fb_helper->delayed_hotplug;
 456         if (do_delayed)
 457                 fb_helper->delayed_hotplug = false;
 458         drm_modeset_unlock_all(dev);
 459
 460         if (do_delayed)
 461                 drm_fb_helper_hotplug_event(fb_helper);
 462         return ret;
 463 }
 464 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 465
 466 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 467 {
 468         struct drm_device *dev = fb_helper->dev;
 469         struct drm_crtc *crtc;
 470         int bound = 0, crtcs_bound = 0;
 471
 472         /* Sometimes user space wants everything disabled, so don't steal the
 473          * display if there's a master. */
 474         if (READ_ONCE(dev->master))
 475                 return false;
 476
 477         drm_for_each_crtc(crtc, dev) {
 478                 if (crtc->primary->fb)
 479                         crtcs_bound++;
 480                 if (crtc->primary->fb == fb_helper->fb)
 481                         bound++;
 482         }
 483
 484         if (bound < crtcs_bound)
 485                 return false;
 486
 487         return true;
 488 }
 489
 490 #ifdef CONFIG_MAGIC_SYSRQ
 491 /*
 492  * restore fbcon display for all kms driver's using this helper, used for sysrq
 493  * and panic handling.
 494  */
 495 static bool drm_fb_helper_force_kernel_mode(void)
 496 {
 497         bool ret, error = false;
 498         struct drm_fb_helper *helper;
 499
 500         if (list_empty(&kernel_fb_helper_list))
 501                 return false;
 502
 503         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 504                 struct drm_device *dev = helper->dev;
 505
 506                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 507                         continue;
 508
 509                 drm_modeset_lock_all(dev);
 510                 ret = restore_fbdev_mode(helper);
 511                 if (ret)
 512                         error = true;
 513                 drm_modeset_unlock_all(dev);
 514         }
 515         return error;
 516 }
 517
 518 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 519 {
 520         bool ret;
 521         ret = drm_fb_helper_force_kernel_mode();
 522         if (ret == true)
 523                 DRM_ERROR("Failed to restore crtc configuration\n");
 524 }
 525 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 526
 527 static void drm_fb_helper_sysrq(int dummy1)
 528 {
 529         schedule_work(&drm_fb_helper_restore_work);
 530 }
 531
 532 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 533         .handler = drm_fb_helper_sysrq,
 534         .help_msg = "force-fb(V)",
 535         .action_msg = "Restore framebuffer console",
 536 };
 537 #else
 538 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 539 #endif
 540
 541 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 542 {
 543         struct drm_fb_helper *fb_helper = info->par;
 544         struct drm_device *dev = fb_helper->dev;
 545         struct drm_crtc *crtc;
 546         struct drm_connector *connector;
 547         int i, j;
 548
 549         /*
 550          * For each CRTC in this fb, turn the connectors on/off.
 551          */
 552         drm_modeset_lock_all(dev);
 553         if (!drm_fb_helper_is_bound(fb_helper)) {
 554                 drm_modeset_unlock_all(dev);
 555                 return;
 556         }
 557
 558         for (i = 0; i < fb_helper->crtc_count; i++) {
 559                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 560
 561                 if (!crtc->enabled)
 562                         continue;
 563
 564                 /* Walk the connectors & encoders on this fb turning them on/off */
 565                 for (j = 0; j < fb_helper->connector_count; j++) {
 566                         connector = fb_helper->connector_info[j]->connector;
 567                         connector->funcs->dpms(connector, dpms_mode);
 568                         drm_object_property_set_value(&connector->base,
 569                                 dev->mode_config.dpms_property, dpms_mode);
 570                 }
 571         }
 572         drm_modeset_unlock_all(dev);
 573 }
 574
 575 /**
 576  * drm_fb_helper_blank - implementation for ->fb_blank
 577  * @blank: desired blanking state
 578  * @info: fbdev registered by the helper
 579  */
 580 int drm_fb_helper_blank(int blank, struct fb_info *info)
 581 {
 582         if (oops_in_progress)
 583                 return -EBUSY;
 584
 585         switch (blank) {
 586         /* Display: On; HSync: On, VSync: On */
 587         case FB_BLANK_UNBLANK:
 588                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 589                 break;
 590         /* Display: Off; HSync: On, VSync: On */
 591         case FB_BLANK_NORMAL:
 592                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 593                 break;
 594         /* Display: Off; HSync: Off, VSync: On */
 595         case FB_BLANK_HSYNC_SUSPEND:
 596                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 597                 break;
 598         /* Display: Off; HSync: On, VSync: Off */
 599         case FB_BLANK_VSYNC_SUSPEND:
 600                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 601                 break;
 602         /* Display: Off; HSync: Off, VSync: Off */
 603         case FB_BLANK_POWERDOWN:
 604                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 605                 break;
 606         }
 607         return 0;
 608 }
 609 EXPORT_SYMBOL(drm_fb_helper_blank);
 610
 611 static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper,
 612                                           struct drm_mode_set *modeset)
 613 {
 614         int i;
 615
 616         for (i = 0; i < modeset->num_connectors; i++) {
 617                 drm_connector_unreference(modeset->connectors[i]);
 618                 modeset->connectors[i] = NULL;
 619         }
 620         modeset->num_connectors = 0;
 621
 622         drm_mode_destroy(helper->dev, modeset->mode);
 623         modeset->mode = NULL;
 624
 625         /* FIXME should hold a ref? */
 626         modeset->fb = NULL;
 627 }
 628
 629 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 630 {
 631         int i;
 632
 633         for (i = 0; i < helper->connector_count; i++) {
 634                 drm_connector_unreference(helper->connector_info[i]->connector);
 635                 kfree(helper->connector_info[i]);
 636         }
 637         kfree(helper->connector_info);
 638
 639         for (i = 0; i < helper->crtc_count; i++) {
 640                 struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set;
 641
 642                 drm_fb_helper_modeset_release(helper, modeset);
 643                 kfree(modeset->connectors);
 644         }
 645         kfree(helper->crtc_info);
 646 }
 647
 648 static void drm_fb_helper_resume_worker(struct work_struct *work)
 649 {
 650         struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
 651                                                     resume_work);
 652
 653         console_lock();
 654         fb_set_suspend(helper->fbdev, 0);
 655         console_unlock();
 656 }
 657
 658 static void drm_fb_helper_dirty_work(struct work_struct *work)
 659 {
 660         struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
 661                                                     dirty_work);
 662         struct drm_clip_rect *clip = &helper->dirty_clip;
 663         struct drm_clip_rect clip_copy;
 664         unsigned long flags;
 665
 666         spin_lock_irqsave(&helper->dirty_lock, flags);
 667         clip_copy = *clip;
 668         clip->x1 = clip->y1 = ~0;
 669         clip->x2 = clip->y2 = 0;
 670         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 671
 672         /* call dirty callback only when it has been really touched */
 673         if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2)
 674                 helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
 675 }
 676
 677 /**
 678  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 679  * @dev: DRM device
 680  * @helper: driver-allocated fbdev helper structure to set up
 681  * @funcs: pointer to structure of functions associate with this helper
 682  *
 683  * Sets up the bare minimum to make the framebuffer helper usable. This is
 684  * useful to implement race-free initialization of the polling helpers.
 685  */
 686 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 687                            const struct drm_fb_helper_funcs *funcs)
 688 {
 689         INIT_LIST_HEAD(&helper->kernel_fb_list);
 690         spin_lock_init(&helper->dirty_lock);
 691         INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
 692         INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
 693         helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
 694         helper->funcs = funcs;
 695         helper->dev = dev;
 696 }
 697 EXPORT_SYMBOL(drm_fb_helper_prepare);
 698
 699 /**
 700  * drm_fb_helper_init - initialize a drm_fb_helper structure
 701  * @dev: drm device
 702  * @fb_helper: driver-allocated fbdev helper structure to initialize
 703  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 704  * @max_conn_count: max connector count
 705  *
 706  * This allocates the structures for the fbdev helper with the given limits.
 707  * Note that this won't yet touch the hardware (through the driver interfaces)
 708  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 709  * to allow driver writes more control over the exact init sequence.
 710  *
 711  * Drivers must call drm_fb_helper_prepare() before calling this function.
 712  *
 713  * RETURNS:
 714  * Zero if everything went ok, nonzero otherwise.
 715  */
 716 int drm_fb_helper_init(struct drm_device *dev,
 717                        struct drm_fb_helper *fb_helper,
 718                        int crtc_count, int max_conn_count)
 719 {
 720         struct drm_crtc *crtc;
 721         int i;
 722
 723         if (!drm_fbdev_emulation)
 724                 return 0;
 725
 726         if (!max_conn_count)
 727                 return -EINVAL;
 728
 729         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 730         if (!fb_helper->crtc_info)
 731                 return -ENOMEM;
 732
 733         fb_helper->crtc_count = crtc_count;
 734         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 735         if (!fb_helper->connector_info) {
 736                 kfree(fb_helper->crtc_info);
 737                 return -ENOMEM;
 738         }
 739         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 740         fb_helper->connector_count = 0;
 741
 742         for (i = 0; i < crtc_count; i++) {
 743                 fb_helper->crtc_info[i].mode_set.connectors =
 744                         kcalloc(max_conn_count,
 745                                 sizeof(struct drm_connector *),
 746                                 GFP_KERNEL);
 747
 748                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 749                         goto out_free;
 750                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 751         }
 752
 753         i = 0;
 754         drm_for_each_crtc(crtc, dev) {
 755                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 756                 i++;
 757         }
 758
 759         return 0;
 760 out_free:
 761         drm_fb_helper_crtc_free(fb_helper);
 762         return -ENOMEM;
 763 }
 764 EXPORT_SYMBOL(drm_fb_helper_init);
 765
 766 /**
 767  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 768  * @fb_helper: driver-allocated fbdev helper
 769  *
 770  * A helper to alloc fb_info and the members cmap and apertures. Called
 771  * by the driver within the fb_probe fb_helper callback function.
 772  *
 773  * RETURNS:
 774  * fb_info pointer if things went okay, pointer containing error code
 775  * otherwise
 776  */
 777 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 778 {
 779         struct device *dev = fb_helper->dev->dev;
 780         struct fb_info *info;
 781         int ret;
 782
 783         info = framebuffer_alloc(0, dev);
 784         if (!info)
 785                 return ERR_PTR(-ENOMEM);
 786
 787         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 788         if (ret)
 789                 goto err_release;
 790
 791         info->apertures = alloc_apertures(1);
 792         if (!info->apertures) {
 793                 ret = -ENOMEM;
 794                 goto err_free_cmap;
 795         }
 796
 797         fb_helper->fbdev = info;
 798
 799         return info;
 800
 801 err_free_cmap:
 802         fb_dealloc_cmap(&info->cmap);
 803 err_release:
 804         framebuffer_release(info);
 805         return ERR_PTR(ret);
 806 }
 807 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 808
 809 /**
 810  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 811  * @fb_helper: driver-allocated fbdev helper
 812  *
 813  * A wrapper around unregister_framebuffer, to release the fb_info
 814  * framebuffer device
 815  */
 816 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 817 {
 818         if (fb_helper && fb_helper->fbdev)
 819                 unregister_framebuffer(fb_helper->fbdev);
 820 }
 821 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 822
 823 /**
 824  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 825  * @fb_helper: driver-allocated fbdev helper
 826  *
 827  * A helper to free memory taken by fb_info and the members cmap and
 828  * apertures
 829  */
 830 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 831 {
 832         if (fb_helper) {
 833                 struct fb_info *info = fb_helper->fbdev;
 834
 835                 if (info) {
 836                         if (info->cmap.len)
 837                                 fb_dealloc_cmap(&info->cmap);
 838                         framebuffer_release(info);
 839                 }
 840
 841                 fb_helper->fbdev = NULL;
 842         }
 843 }
 844 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 845
 846 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 847 {
 848         if (!drm_fbdev_emulation)
 849                 return;
 850
 851         if (!list_empty(&fb_helper->kernel_fb_list)) {
 852                 list_del(&fb_helper->kernel_fb_list);
 853                 if (list_empty(&kernel_fb_helper_list)) {
 854                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 855                 }
 856         }
 857
 858         drm_fb_helper_crtc_free(fb_helper);
 859
 860 }
 861 EXPORT_SYMBOL(drm_fb_helper_fini);
 862
 863 /**
 864  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 865  * @fb_helper: driver-allocated fbdev helper
 866  *
 867  * A wrapper around unlink_framebuffer implemented by fbdev core
 868  */
 869 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 870 {
 871         if (fb_helper && fb_helper->fbdev)
 872                 unlink_framebuffer(fb_helper->fbdev);
 873 }
 874 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 875
 876 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
 877                                 u32 width, u32 height)
 878 {
 879         struct drm_fb_helper *helper = info->par;
 880         struct drm_clip_rect *clip = &helper->dirty_clip;
 881         unsigned long flags;
 882
 883         if (!helper->fb->funcs->dirty)
 884                 return;
 885
 886         spin_lock_irqsave(&helper->dirty_lock, flags);
 887         clip->x1 = min_t(u32, clip->x1, x);
 888         clip->y1 = min_t(u32, clip->y1, y);
 889         clip->x2 = max_t(u32, clip->x2, x + width);
 890         clip->y2 = max_t(u32, clip->y2, y + height);
 891         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 892
 893         schedule_work(&helper->dirty_work);
 894 }
 895
 896 /**
 897  * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
 898  * @info: fb_info struct pointer
 899  * @pagelist: list of dirty mmap framebuffer pages
 900  *
 901  * This function is used as the &fb_deferred_io ->deferred_io
 902  * callback function for flushing the fbdev mmap writes.
 903  */
 904 void drm_fb_helper_deferred_io(struct fb_info *info,
 905                                struct list_head *pagelist)
 906 {
 907         unsigned long start, end, min, max;
 908         struct page *page;
 909         u32 y1, y2;
 910
 911         min = ULONG_MAX;
 912         max = 0;
 913         list_for_each_entry(page, pagelist, lru) {
 914                 start = page->index << PAGE_SHIFT;
 915                 end = start + PAGE_SIZE - 1;
 916                 min = min(min, start);
 917                 max = max(max, end);
 918         }
 919
 920         if (min < max) {
 921                 y1 = min / info->fix.line_length;
 922                 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
 923                            info->var.yres);
 924                 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
 925         }
 926 }
 927 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
 928
 929 /**
 930  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 931  * @info: fb_info struct pointer
 932  * @buf: userspace buffer to read from framebuffer memory
 933  * @count: number of bytes to read from framebuffer memory
 934  * @ppos: read offset within framebuffer memory
 935  *
 936  * A wrapper around fb_sys_read implemented by fbdev core
 937  */
 938 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 939                                size_t count, loff_t *ppos)
 940 {
 941         return fb_sys_read(info, buf, count, ppos);
 942 }
 943 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 944
 945 /**
 946  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 947  * @info: fb_info struct pointer
 948  * @buf: userspace buffer to write to framebuffer memory
 949  * @count: number of bytes to write to framebuffer memory
 950  * @ppos: write offset within framebuffer memory
 951  *
 952  * A wrapper around fb_sys_write implemented by fbdev core
 953  */
 954 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 955                                 size_t count, loff_t *ppos)
 956 {
 957         ssize_t ret;
 958
 959         ret = fb_sys_write(info, buf, count, ppos);
 960         if (ret > 0)
 961                 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
 962                                     info->var.yres);
 963
 964         return ret;
 965 }
 966 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 967
 968 /**
 969  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 970  * @info: fbdev registered by the helper
 971  * @rect: info about rectangle to fill
 972  *
 973  * A wrapper around sys_fillrect implemented by fbdev core
 974  */
 975 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 976                                 const struct fb_fillrect *rect)
 977 {
 978         sys_fillrect(info, rect);
 979         drm_fb_helper_dirty(info, rect->dx, rect->dy,
 980                             rect->width, rect->height);
 981 }
 982 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 983
 984 /**
 985  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 986  * @info: fbdev registered by the helper
 987  * @area: info about area to copy
 988  *
 989  * A wrapper around sys_copyarea implemented by fbdev core
 990  */
 991 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 992                                 const struct fb_copyarea *area)
 993 {
 994         sys_copyarea(info, area);
 995         drm_fb_helper_dirty(info, area->dx, area->dy,
 996                             area->width, area->height);
 997 }
 998 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 999
1000 /**
1001  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
1002  * @info: fbdev registered by the helper
1003  * @image: info about image to blit
1004  *
1005  * A wrapper around sys_imageblit implemented by fbdev core
1006  */
1007 void drm_fb_helper_sys_imageblit(struct fb_info *info,
1008                                  const struct fb_image *image)
1009 {
1010         sys_imageblit(info, image);
1011         drm_fb_helper_dirty(info, image->dx, image->dy,
1012                             image->width, image->height);
1013 }
1014 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
1015
1016 /**
1017  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
1018  * @info: fbdev registered by the helper
1019  * @rect: info about rectangle to fill
1020  *
1021  * A wrapper around cfb_imageblit implemented by fbdev core
1022  */
1023 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
1024                                 const struct fb_fillrect *rect)
1025 {
1026         cfb_fillrect(info, rect);
1027         drm_fb_helper_dirty(info, rect->dx, rect->dy,
1028                             rect->width, rect->height);
1029 }
1030 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1031
1032 /**
1033  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1034  * @info: fbdev registered by the helper
1035  * @area: info about area to copy
1036  *
1037  * A wrapper around cfb_copyarea implemented by fbdev core
1038  */
1039 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1040                                 const struct fb_copyarea *area)
1041 {
1042         cfb_copyarea(info, area);
1043         drm_fb_helper_dirty(info, area->dx, area->dy,
1044                             area->width, area->height);
1045 }
1046 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1047
1048 /**
1049  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1050  * @info: fbdev registered by the helper
1051  * @image: info about image to blit
1052  *
1053  * A wrapper around cfb_imageblit implemented by fbdev core
1054  */
1055 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1056                                  const struct fb_image *image)
1057 {
1058         cfb_imageblit(info, image);
1059         drm_fb_helper_dirty(info, image->dx, image->dy,
1060                             image->width, image->height);
1061 }
1062 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1063
1064 /**
1065  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1066  * @fb_helper: driver-allocated fbdev helper
1067  * @suspend: whether to suspend or resume
1068  *
1069  * A wrapper around fb_set_suspend implemented by fbdev core.
1070  * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1071  * the lock yourself
1072  */
1073 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1074 {
1075         if (fb_helper && fb_helper->fbdev)
1076                 fb_set_suspend(fb_helper->fbdev, suspend);
1077 }
1078 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1079
1080 /**
1081  * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1082  *                                      takes the console lock
1083  * @fb_helper: driver-allocated fbdev helper
1084  * @suspend: whether to suspend or resume
1085  *
1086  * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1087  * isn't available on resume, a worker is tasked with waiting for the lock
1088  * to become available. The console lock can be pretty contented on resume
1089  * due to all the printk activity.
1090  *
1091  * This function can be called multiple times with the same state since
1092  * &fb_info->state is checked to see if fbdev is running or not before locking.
1093  *
1094  * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1095  */
1096 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1097                                         bool suspend)
1098 {
1099         if (!fb_helper || !fb_helper->fbdev)
1100                 return;
1101
1102         /* make sure there's no pending/ongoing resume */
1103         flush_work(&fb_helper->resume_work);
1104
1105         if (suspend) {
1106                 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
1107                         return;
1108
1109                 console_lock();
1110
1111         } else {
1112                 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
1113                         return;
1114
1115                 if (!console_trylock()) {
1116                         schedule_work(&fb_helper->resume_work);
1117                         return;
1118                 }
1119         }
1120
1121         fb_set_suspend(fb_helper->fbdev, suspend);
1122         console_unlock();
1123 }
1124 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1125
1126 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1127                      u16 blue, u16 regno, struct fb_info *info)
1128 {
1129         struct drm_fb_helper *fb_helper = info->par;
1130         struct drm_framebuffer *fb = fb_helper->fb;
1131
1132         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1133                 u32 *palette;
1134                 u32 value;
1135                 /* place color in psuedopalette */
1136                 if (regno > 16)
1137                         return -EINVAL;
1138                 palette = (u32 *)info->pseudo_palette;
1139                 red >>= (16 - info->var.red.length);
1140                 green >>= (16 - info->var.green.length);
1141                 blue >>= (16 - info->var.blue.length);
1142                 value = (red << info->var.red.offset) |
1143                         (green << info->var.green.offset) |
1144                         (blue << info->var.blue.offset);
1145                 if (info->var.transp.length > 0) {
1146                         u32 mask = (1 << info->var.transp.length) - 1;
1147                         mask <<= info->var.transp.offset;
1148                         value |= mask;
1149                 }
1150                 palette[regno] = value;
1151                 return 0;
1152         }
1153
1154         /*
1155          * The driver really shouldn't advertise pseudo/directcolor
1156          * visuals if it can't deal with the palette.
1157          */
1158         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1159                     !fb_helper->funcs->gamma_get))
1160                 return -EINVAL;
1161
1162         WARN_ON(fb->bits_per_pixel != 8);
1163
1164         fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1165
1166         return 0;
1167 }
1168
1169 /**
1170  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1171  * @cmap: cmap to set
1172  * @info: fbdev registered by the helper
1173  */
1174 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1175 {
1176         struct drm_fb_helper *fb_helper = info->par;
1177         struct drm_device *dev = fb_helper->dev;
1178         const struct drm_crtc_helper_funcs *crtc_funcs;
1179         u16 *red, *green, *blue, *transp;
1180         struct drm_crtc *crtc;
1181         int i, j, rc = 0;
1182         int start;
1183
1184         if (oops_in_progress)
1185                 return -EBUSY;
1186
1187         drm_modeset_lock_all(dev);
1188         if (!drm_fb_helper_is_bound(fb_helper)) {
1189                 drm_modeset_unlock_all(dev);
1190                 return -EBUSY;
1191         }
1192
1193         for (i = 0; i < fb_helper->crtc_count; i++) {
1194                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1195                 crtc_funcs = crtc->helper_private;
1196
1197                 red = cmap->red;
1198                 green = cmap->green;
1199                 blue = cmap->blue;
1200                 transp = cmap->transp;
1201                 start = cmap->start;
1202
1203                 for (j = 0; j < cmap->len; j++) {
1204                         u16 hred, hgreen, hblue, htransp = 0xffff;
1205
1206                         hred = *red++;
1207                         hgreen = *green++;
1208                         hblue = *blue++;
1209
1210                         if (transp)
1211                                 htransp = *transp++;
1212
1213                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1214                         if (rc)
1215                                 goto out;
1216                 }
1217                 if (crtc_funcs->load_lut)
1218                         crtc_funcs->load_lut(crtc);
1219         }
1220  out:
1221         drm_modeset_unlock_all(dev);
1222         return rc;
1223 }
1224 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1225
1226 /**
1227  * drm_fb_helper_check_var - implementation for ->fb_check_var
1228  * @var: screeninfo to check
1229  * @info: fbdev registered by the helper
1230  */
1231 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1232                             struct fb_info *info)
1233 {
1234         struct drm_fb_helper *fb_helper = info->par;
1235         struct drm_framebuffer *fb = fb_helper->fb;
1236         int depth;
1237
1238         if (var->pixclock != 0 || in_dbg_master())
1239                 return -EINVAL;
1240
1241         /* Need to resize the fb object !!! */
1242         if (var->bits_per_pixel > fb->bits_per_pixel ||
1243             var->xres > fb->width || var->yres > fb->height ||
1244             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1245                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1246                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1247                           var->xres, var->yres, var->bits_per_pixel,
1248                           var->xres_virtual, var->yres_virtual,
1249                           fb->width, fb->height, fb->bits_per_pixel);
1250                 return -EINVAL;
1251         }
1252
1253         switch (var->bits_per_pixel) {
1254         case 16:
1255                 depth = (var->green.length == 6) ? 16 : 15;
1256                 break;
1257         case 32:
1258                 depth = (var->transp.length > 0) ? 32 : 24;
1259                 break;
1260         default:
1261                 depth = var->bits_per_pixel;
1262                 break;
1263         }
1264
1265         switch (depth) {
1266         case 8:
1267                 var->red.offset = 0;
1268                 var->green.offset = 0;
1269                 var->blue.offset = 0;
1270                 var->red.length = 8;
1271                 var->green.length = 8;
1272                 var->blue.length = 8;
1273                 var->transp.length = 0;
1274                 var->transp.offset = 0;
1275                 break;
1276         case 15:
1277                 var->red.offset = 10;
1278                 var->green.offset = 5;
1279                 var->blue.offset = 0;
1280                 var->red.length = 5;
1281                 var->green.length = 5;
1282                 var->blue.length = 5;
1283                 var->transp.length = 1;
1284                 var->transp.offset = 15;
1285                 break;
1286         case 16:
1287                 var->red.offset = 11;
1288                 var->green.offset = 5;
1289                 var->blue.offset = 0;
1290                 var->red.length = 5;
1291                 var->green.length = 6;
1292                 var->blue.length = 5;
1293                 var->transp.length = 0;
1294                 var->transp.offset = 0;
1295                 break;
1296         case 24:
1297                 var->red.offset = 16;
1298                 var->green.offset = 8;
1299                 var->blue.offset = 0;
1300                 var->red.length = 8;
1301                 var->green.length = 8;
1302                 var->blue.length = 8;
1303                 var->transp.length = 0;
1304                 var->transp.offset = 0;
1305                 break;
1306         case 32:
1307                 var->red.offset = 16;
1308                 var->green.offset = 8;
1309                 var->blue.offset = 0;
1310                 var->red.length = 8;
1311                 var->green.length = 8;
1312                 var->blue.length = 8;
1313                 var->transp.length = 8;
1314                 var->transp.offset = 24;
1315                 break;
1316         default:
1317                 return -EINVAL;
1318         }
1319         return 0;
1320 }
1321 EXPORT_SYMBOL(drm_fb_helper_check_var);
1322
1323 /**
1324  * drm_fb_helper_set_par - implementation for ->fb_set_par
1325  * @info: fbdev registered by the helper
1326  *
1327  * This will let fbcon do the mode init and is called at initialization time by
1328  * the fbdev core when registering the driver, and later on through the hotplug
1329  * callback.
1330  */
1331 int drm_fb_helper_set_par(struct fb_info *info)
1332 {
1333         struct drm_fb_helper *fb_helper = info->par;
1334         struct fb_var_screeninfo *var = &info->var;
1335
1336         if (oops_in_progress)
1337                 return -EBUSY;
1338
1339         if (var->pixclock != 0) {
1340                 DRM_ERROR("PIXEL CLOCK SET\n");
1341                 return -EINVAL;
1342         }
1343
1344         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1345
1346         return 0;
1347 }
1348 EXPORT_SYMBOL(drm_fb_helper_set_par);
1349
1350 static int pan_display_atomic(struct fb_var_screeninfo *var,
1351                               struct fb_info *info)
1352 {
1353         struct drm_fb_helper *fb_helper = info->par;
1354         struct drm_device *dev = fb_helper->dev;
1355         struct drm_atomic_state *state;
1356         struct drm_plane *plane;
1357         int i, ret;
1358         unsigned plane_mask;
1359
1360         state = drm_atomic_state_alloc(dev);
1361         if (!state)
1362                 return -ENOMEM;
1363
1364         state->acquire_ctx = dev->mode_config.acquire_ctx;
1365 retry:
1366         plane_mask = 0;
1367         for(i = 0; i < fb_helper->crtc_count; i++) {
1368                 struct drm_mode_set *mode_set;
1369
1370                 mode_set = &fb_helper->crtc_info[i].mode_set;
1371
1372                 mode_set->x = var->xoffset;
1373                 mode_set->y = var->yoffset;
1374
1375                 ret = __drm_atomic_helper_set_config(mode_set, state);
1376                 if (ret != 0)
1377                         goto fail;
1378
1379                 plane = mode_set->crtc->primary;
1380                 plane_mask |= (1 << drm_plane_index(plane));
1381                 plane->old_fb = plane->fb;
1382         }
1383
1384         ret = drm_atomic_commit(state);
1385         if (ret != 0)
1386                 goto fail;
1387
1388         info->var.xoffset = var->xoffset;
1389         info->var.yoffset = var->yoffset;
1390
1391
1392 fail:
1393         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1394
1395         if (ret == -EDEADLK)
1396                 goto backoff;
1397
1398         if (ret != 0)
1399                 drm_atomic_state_free(state);
1400
1401         return ret;
1402
1403 backoff:
1404         drm_atomic_state_clear(state);
1405         drm_atomic_legacy_backoff(state);
1406
1407         goto retry;
1408 }
1409
1410 /**
1411  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1412  * @var: updated screen information
1413  * @info: fbdev registered by the helper
1414  */
1415 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1416                               struct fb_info *info)
1417 {
1418         struct drm_fb_helper *fb_helper = info->par;
1419         struct drm_device *dev = fb_helper->dev;
1420         struct drm_mode_set *modeset;
1421         int ret = 0;
1422         int i;
1423
1424         if (oops_in_progress)
1425                 return -EBUSY;
1426
1427         drm_modeset_lock_all(dev);
1428         if (!drm_fb_helper_is_bound(fb_helper)) {
1429                 drm_modeset_unlock_all(dev);
1430                 return -EBUSY;
1431         }
1432
1433         if (dev->mode_config.funcs->atomic_commit) {
1434                 ret = pan_display_atomic(var, info);
1435                 goto unlock;
1436         }
1437
1438         for (i = 0; i < fb_helper->crtc_count; i++) {
1439                 modeset = &fb_helper->crtc_info[i].mode_set;
1440
1441                 modeset->x = var->xoffset;
1442                 modeset->y = var->yoffset;
1443
1444                 if (modeset->num_connectors) {
1445                         ret = drm_mode_set_config_internal(modeset);
1446                         if (!ret) {
1447                                 info->var.xoffset = var->xoffset;
1448                                 info->var.yoffset = var->yoffset;
1449                         }
1450                 }
1451         }
1452 unlock:
1453         drm_modeset_unlock_all(dev);
1454         return ret;
1455 }
1456 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1457
1458 /*
1459  * Allocates the backing storage and sets up the fbdev info structure through
1460  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1461  * notifier.
1462  */
1463 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1464                                          int preferred_bpp)
1465 {
1466         int ret = 0;
1467         int crtc_count = 0;
1468         int i;
1469         struct fb_info *info;
1470         struct drm_fb_helper_surface_size sizes;
1471         int gamma_size = 0;
1472
1473         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1474         sizes.surface_depth = 24;
1475         sizes.surface_bpp = 32;
1476         sizes.fb_width = (unsigned)-1;
1477         sizes.fb_height = (unsigned)-1;
1478
1479         /* if driver picks 8 or 16 by default use that
1480            for both depth/bpp */
1481         if (preferred_bpp != sizes.surface_bpp)
1482                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1483
1484         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1485         for (i = 0; i < fb_helper->connector_count; i++) {
1486                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1487                 struct drm_cmdline_mode *cmdline_mode;
1488
1489                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1490
1491                 if (cmdline_mode->bpp_specified) {
1492                         switch (cmdline_mode->bpp) {
1493                         case 8:
1494                                 sizes.surface_depth = sizes.surface_bpp = 8;
1495                                 break;
1496                         case 15:
1497                                 sizes.surface_depth = 15;
1498                                 sizes.surface_bpp = 16;
1499                                 break;
1500                         case 16:
1501                                 sizes.surface_depth = sizes.surface_bpp = 16;
1502                                 break;
1503                         case 24:
1504                                 sizes.surface_depth = sizes.surface_bpp = 24;
1505                                 break;
1506                         case 32:
1507                                 sizes.surface_depth = 24;
1508                                 sizes.surface_bpp = 32;
1509                                 break;
1510                         }
1511                         break;
1512                 }
1513         }
1514
1515         crtc_count = 0;
1516         for (i = 0; i < fb_helper->crtc_count; i++) {
1517                 struct drm_display_mode *desired_mode;
1518                 struct drm_mode_set *mode_set;
1519                 int x, y, j;
1520                 /* in case of tile group, are we the last tile vert or horiz?
1521                  * If no tile group you are always the last one both vertically
1522                  * and horizontally
1523                  */
1524                 bool lastv = true, lasth = true;
1525
1526                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1527                 mode_set = &fb_helper->crtc_info[i].mode_set;
1528
1529                 if (!desired_mode)
1530                         continue;
1531
1532                 crtc_count++;
1533
1534                 x = fb_helper->crtc_info[i].x;
1535                 y = fb_helper->crtc_info[i].y;
1536
1537                 if (gamma_size == 0)
1538                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1539
1540                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1541                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1542
1543                 for (j = 0; j < mode_set->num_connectors; j++) {
1544                         struct drm_connector *connector = mode_set->connectors[j];
1545                         if (connector->has_tile) {
1546                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1547                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1548                                 /* cloning to multiple tiles is just crazy-talk, so: */
1549                                 break;
1550                         }
1551                 }
1552
1553                 if (lasth)
1554                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1555                 if (lastv)
1556                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1557         }
1558
1559         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1560                 /* hmm everyone went away - assume VGA cable just fell out
1561                    and will come back later. */
1562                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1563                 sizes.fb_width = sizes.surface_width = 1024;
1564                 sizes.fb_height = sizes.surface_height = 768;
1565         }
1566
1567         /* push down into drivers */
1568         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1569         if (ret < 0)
1570                 return ret;
1571
1572         info = fb_helper->fbdev;
1573
1574         /*
1575          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1576          * events, but at init time drm_setup_crtcs needs to be called before
1577          * the fb is allocated (since we need to figure out the desired size of
1578          * the fb before we can allocate it ...). Hence we need to fix things up
1579          * here again.
1580          */
1581         for (i = 0; i < fb_helper->crtc_count; i++)
1582                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1583                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1584
1585
1586         info->var.pixclock = 0;
1587         if (register_framebuffer(info) < 0)
1588                 return -EINVAL;
1589
1590         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1591                         info->node, info->fix.id);
1592
1593         if (list_empty(&kernel_fb_helper_list)) {
1594                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1595         }
1596
1597         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1598
1599         return 0;
1600 }
1601
1602 /**
1603  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1604  * @info: fbdev registered by the helper
1605  * @pitch: desired pitch
1606  * @depth: desired depth
1607  *
1608  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1609  * fbdev emulations. Drivers which support acceleration methods which impose
1610  * additional constraints need to set up their own limits.
1611  *
1612  * Drivers should call this (or their equivalent setup code) from their
1613  * ->fb_probe callback.
1614  */
1615 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1616                             uint32_t depth)
1617 {
1618         info->fix.type = FB_TYPE_PACKED_PIXELS;
1619         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1620                 FB_VISUAL_TRUECOLOR;
1621         info->fix.mmio_start = 0;
1622         info->fix.mmio_len = 0;
1623         info->fix.type_aux = 0;
1624         info->fix.xpanstep = 1; /* doing it in hw */
1625         info->fix.ypanstep = 1; /* doing it in hw */
1626         info->fix.ywrapstep = 0;
1627         info->fix.accel = FB_ACCEL_NONE;
1628
1629         info->fix.line_length = pitch;
1630         return;
1631 }
1632 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1633
1634 /**
1635  * drm_fb_helper_fill_var - initalizes variable fbdev information
1636  * @info: fbdev instance to set up
1637  * @fb_helper: fb helper instance to use as template
1638  * @fb_width: desired fb width
1639  * @fb_height: desired fb height
1640  *
1641  * Sets up the variable fbdev metainformation from the given fb helper instance
1642  * and the drm framebuffer allocated in fb_helper->fb.
1643  *
1644  * Drivers should call this (or their equivalent setup code) from their
1645  * ->fb_probe callback after having allocated the fbdev backing
1646  * storage framebuffer.
1647  */
1648 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1649                             uint32_t fb_width, uint32_t fb_height)
1650 {
1651         struct drm_framebuffer *fb = fb_helper->fb;
1652         info->pseudo_palette = fb_helper->pseudo_palette;
1653         info->var.xres_virtual = fb->width;
1654         info->var.yres_virtual = fb->height;
1655         info->var.bits_per_pixel = fb->bits_per_pixel;
1656         info->var.accel_flags = FB_ACCELF_TEXT;
1657         info->var.xoffset = 0;
1658         info->var.yoffset = 0;
1659         info->var.activate = FB_ACTIVATE_NOW;
1660         info->var.height = -1;
1661         info->var.width = -1;
1662
1663         switch (fb->depth) {
1664         case 8:
1665                 info->var.red.offset = 0;
1666                 info->var.green.offset = 0;
1667                 info->var.blue.offset = 0;
1668                 info->var.red.length = 8; /* 8bit DAC */
1669                 info->var.green.length = 8;
1670                 info->var.blue.length = 8;
1671                 info->var.transp.offset = 0;
1672                 info->var.transp.length = 0;
1673                 break;
1674         case 15:
1675                 info->var.red.offset = 10;
1676                 info->var.green.offset = 5;
1677                 info->var.blue.offset = 0;
1678                 info->var.red.length = 5;
1679                 info->var.green.length = 5;
1680                 info->var.blue.length = 5;
1681                 info->var.transp.offset = 15;
1682                 info->var.transp.length = 1;
1683                 break;
1684         case 16:
1685                 info->var.red.offset = 11;
1686                 info->var.green.offset = 5;
1687                 info->var.blue.offset = 0;
1688                 info->var.red.length = 5;
1689                 info->var.green.length = 6;
1690                 info->var.blue.length = 5;
1691                 info->var.transp.offset = 0;
1692                 break;
1693         case 24:
1694                 info->var.red.offset = 16;
1695                 info->var.green.offset = 8;
1696                 info->var.blue.offset = 0;
1697                 info->var.red.length = 8;
1698                 info->var.green.length = 8;
1699                 info->var.blue.length = 8;
1700                 info->var.transp.offset = 0;
1701                 info->var.transp.length = 0;
1702                 break;
1703         case 32:
1704                 info->var.red.offset = 16;
1705                 info->var.green.offset = 8;
1706                 info->var.blue.offset = 0;
1707                 info->var.red.length = 8;
1708                 info->var.green.length = 8;
1709                 info->var.blue.length = 8;
1710                 info->var.transp.offset = 24;
1711                 info->var.transp.length = 8;
1712                 break;
1713         default:
1714                 break;
1715         }
1716
1717         info->var.xres = fb_width;
1718         info->var.yres = fb_height;
1719 }
1720 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1721
1722 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1723                                                uint32_t maxX,
1724                                                uint32_t maxY)
1725 {
1726         struct drm_connector *connector;
1727         int count = 0;
1728         int i;
1729
1730         for (i = 0; i < fb_helper->connector_count; i++) {
1731                 connector = fb_helper->connector_info[i]->connector;
1732                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1733         }
1734
1735         return count;
1736 }
1737
1738 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1739 {
1740         struct drm_display_mode *mode;
1741
1742         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1743                 if (mode->hdisplay > width ||
1744                     mode->vdisplay > height)
1745                         continue;
1746                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1747                         return mode;
1748         }
1749         return NULL;
1750 }
1751 EXPORT_SYMBOL(drm_has_preferred_mode);
1752
1753 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1754 {
1755         return fb_connector->connector->cmdline_mode.specified;
1756 }
1757
1758 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1759                                                       int width, int height)
1760 {
1761         struct drm_cmdline_mode *cmdline_mode;
1762         struct drm_display_mode *mode;
1763         bool prefer_non_interlace;
1764
1765         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1766         if (cmdline_mode->specified == false)
1767                 return NULL;
1768
1769         /* attempt to find a matching mode in the list of modes
1770          *  we have gotten so far, if not add a CVT mode that conforms
1771          */
1772         if (cmdline_mode->rb || cmdline_mode->margins)
1773                 goto create_mode;
1774
1775         prefer_non_interlace = !cmdline_mode->interlace;
1776 again:
1777         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1778                 /* check width/height */
1779                 if (mode->hdisplay != cmdline_mode->xres ||
1780                     mode->vdisplay != cmdline_mode->yres)
1781                         continue;
1782
1783                 if (cmdline_mode->refresh_specified) {
1784                         if (mode->vrefresh != cmdline_mode->refresh)
1785                                 continue;
1786                 }
1787
1788                 if (cmdline_mode->interlace) {
1789                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1790                                 continue;
1791                 } else if (prefer_non_interlace) {
1792                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1793                                 continue;
1794                 }
1795                 return mode;
1796         }
1797
1798         if (prefer_non_interlace) {
1799                 prefer_non_interlace = false;
1800                 goto again;
1801         }
1802
1803 create_mode:
1804         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1805                                                  cmdline_mode);
1806         list_add(&mode->head, &fb_helper_conn->connector->modes);
1807         return mode;
1808 }
1809 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1810
1811 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1812 {
1813         bool enable;
1814
1815         if (strict)
1816                 enable = connector->status == connector_status_connected;
1817         else
1818                 enable = connector->status != connector_status_disconnected;
1819
1820         return enable;
1821 }
1822
1823 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1824                                   bool *enabled)
1825 {
1826         bool any_enabled = false;
1827         struct drm_connector *connector;
1828         int i = 0;
1829
1830         for (i = 0; i < fb_helper->connector_count; i++) {
1831                 connector = fb_helper->connector_info[i]->connector;
1832                 enabled[i] = drm_connector_enabled(connector, true);
1833                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1834                           enabled[i] ? "yes" : "no");
1835                 any_enabled |= enabled[i];
1836         }
1837
1838         if (any_enabled)
1839                 return;
1840
1841         for (i = 0; i < fb_helper->connector_count; i++) {
1842                 connector = fb_helper->connector_info[i]->connector;
1843                 enabled[i] = drm_connector_enabled(connector, false);
1844         }
1845 }
1846
1847 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1848                               struct drm_display_mode **modes,
1849                               struct drm_fb_offset *offsets,
1850                               bool *enabled, int width, int height)
1851 {
1852         int count, i, j;
1853         bool can_clone = false;
1854         struct drm_fb_helper_connector *fb_helper_conn;
1855         struct drm_display_mode *dmt_mode, *mode;
1856
1857         /* only contemplate cloning in the single crtc case */
1858         if (fb_helper->crtc_count > 1)
1859                 return false;
1860
1861         count = 0;
1862         for (i = 0; i < fb_helper->connector_count; i++) {
1863                 if (enabled[i])
1864                         count++;
1865         }
1866
1867         /* only contemplate cloning if more than one connector is enabled */
1868         if (count <= 1)
1869                 return false;
1870
1871         /* check the command line or if nothing common pick 1024x768 */
1872         can_clone = true;
1873         for (i = 0; i < fb_helper->connector_count; i++) {
1874                 if (!enabled[i])
1875                         continue;
1876                 fb_helper_conn = fb_helper->connector_info[i];
1877                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1878                 if (!modes[i]) {
1879                         can_clone = false;
1880                         break;
1881                 }
1882                 for (j = 0; j < i; j++) {
1883                         if (!enabled[j])
1884                                 continue;
1885                         if (!drm_mode_equal(modes[j], modes[i]))
1886                                 can_clone = false;
1887                 }
1888         }
1889
1890         if (can_clone) {
1891                 DRM_DEBUG_KMS("can clone using command line\n");
1892                 return true;
1893         }
1894
1895         /* try and find a 1024x768 mode on each connector */
1896         can_clone = true;
1897         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1898
1899         for (i = 0; i < fb_helper->connector_count; i++) {
1900
1901                 if (!enabled[i])
1902                         continue;
1903
1904                 fb_helper_conn = fb_helper->connector_info[i];
1905                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1906                         if (drm_mode_equal(mode, dmt_mode))
1907                                 modes[i] = mode;
1908                 }
1909                 if (!modes[i])
1910                         can_clone = false;
1911         }
1912
1913         if (can_clone) {
1914                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1915                 return true;
1916         }
1917         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1918         return false;
1919 }
1920
1921 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1922                                 struct drm_display_mode **modes,
1923                                 struct drm_fb_offset *offsets,
1924                                 int idx,
1925                                 int h_idx, int v_idx)
1926 {
1927         struct drm_fb_helper_connector *fb_helper_conn;
1928         int i;
1929         int hoffset = 0, voffset = 0;
1930
1931         for (i = 0; i < fb_helper->connector_count; i++) {
1932                 fb_helper_conn = fb_helper->connector_info[i];
1933                 if (!fb_helper_conn->connector->has_tile)
1934                         continue;
1935
1936                 if (!modes[i] && (h_idx || v_idx)) {
1937                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1938                                       fb_helper_conn->connector->base.id);
1939                         continue;
1940                 }
1941                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1942                         hoffset += modes[i]->hdisplay;
1943
1944                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1945                         voffset += modes[i]->vdisplay;
1946         }
1947         offsets[idx].x = hoffset;
1948         offsets[idx].y = voffset;
1949         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1950         return 0;
1951 }
1952
1953 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1954                                  struct drm_display_mode **modes,
1955                                  struct drm_fb_offset *offsets,
1956                                  bool *enabled, int width, int height)
1957 {
1958         struct drm_fb_helper_connector *fb_helper_conn;
1959         int i;
1960         uint64_t conn_configured = 0, mask;
1961         int tile_pass = 0;
1962         mask = (1 << fb_helper->connector_count) - 1;
1963 retry:
1964         for (i = 0; i < fb_helper->connector_count; i++) {
1965                 fb_helper_conn = fb_helper->connector_info[i];
1966
1967                 if (conn_configured & (1 << i))
1968                         continue;
1969
1970                 if (enabled[i] == false) {
1971                         conn_configured |= (1 << i);
1972                         continue;
1973                 }
1974
1975                 /* first pass over all the untiled connectors */
1976                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1977                         continue;
1978
1979                 if (tile_pass == 1) {
1980                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1981                             fb_helper_conn->connector->tile_v_loc != 0)
1982                                 continue;
1983
1984                 } else {
1985                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1986                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1987                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1988                                 continue;
1989
1990                         /* find the tile offsets for this pass - need
1991                            to find all tiles left and above */
1992                         drm_get_tile_offsets(fb_helper, modes, offsets,
1993                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1994                 }
1995                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1996                               fb_helper_conn->connector->base.id);
1997
1998                 /* got for command line mode first */
1999                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
2000                 if (!modes[i]) {
2001                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
2002                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
2003                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
2004                 }
2005                 /* No preferred modes, pick one off the list */
2006                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
2007                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
2008                                 break;
2009                 }
2010                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
2011                           "none");
2012                 conn_configured |= (1 << i);
2013         }
2014
2015         if ((conn_configured & mask) != mask) {
2016                 tile_pass++;
2017                 goto retry;
2018         }
2019         return true;
2020 }
2021
2022 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
2023                           struct drm_fb_helper_crtc **best_crtcs,
2024                           struct drm_display_mode **modes,
2025                           int n, int width, int height)
2026 {
2027         int c, o;
2028         struct drm_connector *connector;
2029         const struct drm_connector_helper_funcs *connector_funcs;
2030         struct drm_encoder *encoder;
2031         int my_score, best_score, score;
2032         struct drm_fb_helper_crtc **crtcs, *crtc;
2033         struct drm_fb_helper_connector *fb_helper_conn;
2034
2035         if (n == fb_helper->connector_count)
2036                 return 0;
2037
2038         fb_helper_conn = fb_helper->connector_info[n];
2039         connector = fb_helper_conn->connector;
2040
2041         best_crtcs[n] = NULL;
2042         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
2043         if (modes[n] == NULL)
2044                 return best_score;
2045
2046         crtcs = kzalloc(fb_helper->connector_count *
2047                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2048         if (!crtcs)
2049                 return best_score;
2050
2051         my_score = 1;
2052         if (connector->status == connector_status_connected)
2053                 my_score++;
2054         if (drm_has_cmdline_mode(fb_helper_conn))
2055                 my_score++;
2056         if (drm_has_preferred_mode(fb_helper_conn, width, height))
2057                 my_score++;
2058
2059         connector_funcs = connector->helper_private;
2060
2061         /*
2062          * If the DRM device implements atomic hooks and ->best_encoder() is
2063          * NULL we fallback to the default drm_atomic_helper_best_encoder()
2064          * helper.
2065          */
2066         if (fb_helper->dev->mode_config.funcs->atomic_commit &&
2067             !connector_funcs->best_encoder)
2068                 encoder = drm_atomic_helper_best_encoder(connector);
2069         else
2070                 encoder = connector_funcs->best_encoder(connector);
2071
2072         if (!encoder)
2073                 goto out;
2074
2075         /* select a crtc for this connector and then attempt to configure
2076            remaining connectors */
2077         for (c = 0; c < fb_helper->crtc_count; c++) {
2078                 crtc = &fb_helper->crtc_info[c];
2079
2080                 if ((encoder->possible_crtcs & (1 << c)) == 0)
2081                         continue;
2082
2083                 for (o = 0; o < n; o++)
2084                         if (best_crtcs[o] == crtc)
2085                                 break;
2086
2087                 if (o < n) {
2088                         /* ignore cloning unless only a single crtc */
2089                         if (fb_helper->crtc_count > 1)
2090                                 continue;
2091
2092                         if (!drm_mode_equal(modes[o], modes[n]))
2093                                 continue;
2094                 }
2095
2096                 crtcs[n] = crtc;
2097                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2098                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2099                                                   width, height);
2100                 if (score > best_score) {
2101                         best_score = score;
2102                         memcpy(best_crtcs, crtcs,
2103                                fb_helper->connector_count *
2104                                sizeof(struct drm_fb_helper_crtc *));
2105                 }
2106         }
2107 out:
2108         kfree(crtcs);
2109         return best_score;
2110 }
2111
2112 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2113 {
2114         struct drm_device *dev = fb_helper->dev;
2115         struct drm_fb_helper_crtc **crtcs;
2116         struct drm_display_mode **modes;
2117         struct drm_fb_offset *offsets;
2118         bool *enabled;
2119         int width, height;
2120         int i;
2121
2122         DRM_DEBUG_KMS("\n");
2123
2124         width = dev->mode_config.max_width;
2125         height = dev->mode_config.max_height;
2126
2127         crtcs = kcalloc(fb_helper->connector_count,
2128                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2129         modes = kcalloc(fb_helper->connector_count,
2130                         sizeof(struct drm_display_mode *), GFP_KERNEL);
2131         offsets = kcalloc(fb_helper->connector_count,
2132                           sizeof(struct drm_fb_offset), GFP_KERNEL);
2133         enabled = kcalloc(fb_helper->connector_count,
2134                           sizeof(bool), GFP_KERNEL);
2135         if (!crtcs || !modes || !enabled || !offsets) {
2136                 DRM_ERROR("Memory allocation failed\n");
2137                 goto out;
2138         }
2139
2140
2141         drm_enable_connectors(fb_helper, enabled);
2142
2143         if (!(fb_helper->funcs->initial_config &&
2144               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2145                                                offsets,
2146                                                enabled, width, height))) {
2147                 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2148                 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2149                 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2150
2151                 if (!drm_target_cloned(fb_helper, modes, offsets,
2152                                        enabled, width, height) &&
2153                     !drm_target_preferred(fb_helper, modes, offsets,
2154                                           enabled, width, height))
2155                         DRM_ERROR("Unable to find initial modes\n");
2156
2157                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2158                               width, height);
2159
2160                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2161         }
2162
2163         /* need to set the modesets up here for use later */
2164         /* fill out the connector<->crtc mappings into the modesets */
2165         for (i = 0; i < fb_helper->crtc_count; i++)
2166                 drm_fb_helper_modeset_release(fb_helper,
2167                                               &fb_helper->crtc_info[i].mode_set);
2168
2169         for (i = 0; i < fb_helper->connector_count; i++) {
2170                 struct drm_display_mode *mode = modes[i];
2171                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2172                 struct drm_fb_offset *offset = &offsets[i];
2173                 struct drm_mode_set *modeset = &fb_crtc->mode_set;
2174
2175                 if (mode && fb_crtc) {
2176                         struct drm_connector *connector =
2177                                 fb_helper->connector_info[i]->connector;
2178
2179                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2180                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2181
2182                         fb_crtc->desired_mode = mode;
2183                         fb_crtc->x = offset->x;
2184                         fb_crtc->y = offset->y;
2185                         modeset->mode = drm_mode_duplicate(dev,
2186                                                            fb_crtc->desired_mode);
2187                         drm_connector_reference(connector);
2188                         modeset->connectors[modeset->num_connectors++] = connector;
2189                         modeset->fb = fb_helper->fb;
2190                         modeset->x = offset->x;
2191                         modeset->y = offset->y;
2192                 }
2193         }
2194 out:
2195         kfree(crtcs);
2196         kfree(modes);
2197         kfree(offsets);
2198         kfree(enabled);
2199 }
2200
2201 /**
2202  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2203  * @fb_helper: fb_helper device struct
2204  * @bpp_sel: bpp value to use for the framebuffer configuration
2205  *
2206  * Scans the CRTCs and connectors and tries to put together an initial setup.
2207  * At the moment, this is a cloned configuration across all heads with
2208  * a new framebuffer object as the backing store.
2209  *
2210  * Note that this also registers the fbdev and so allows userspace to call into
2211  * the driver through the fbdev interfaces.
2212  *
2213  * This function will call down into the ->fb_probe callback to let
2214  * the driver allocate and initialize the fbdev info structure and the drm
2215  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2216  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2217  * values for the fbdev info structure.
2218  *
2219  * HANG DEBUGGING:
2220  *
2221  * When you have fbcon support built-in or already loaded, this function will do
2222  * a full modeset to setup the fbdev console. Due to locking misdesign in the
2223  * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2224  * console_lock. Until console_unlock is called no dmesg lines will be sent out
2225  * to consoles, not even serial console. This means when your driver crashes,
2226  * you will see absolutely nothing else but a system stuck in this function,
2227  * with no further output. Any kind of printk() you place within your own driver
2228  * or in the drm core modeset code will also never show up.
2229  *
2230  * Standard debug practice is to run the fbcon setup without taking the
2231  * console_lock as a hack, to be able to see backtraces and crashes on the
2232  * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2233  * cmdline option.
2234  *
2235  * The other option is to just disable fbdev emulation since very likely the
2236  * first modeset from userspace will crash in the same way, and is even easier
2237  * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2238  * kernel cmdline option.
2239  *
2240  * RETURNS:
2241  * Zero if everything went ok, nonzero otherwise.
2242  */
2243 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2244 {
2245         struct drm_device *dev = fb_helper->dev;
2246         int count = 0;
2247
2248         if (!drm_fbdev_emulation)
2249                 return 0;
2250
2251         mutex_lock(&dev->mode_config.mutex);
2252         count = drm_fb_helper_probe_connector_modes(fb_helper,
2253                                                     dev->mode_config.max_width,
2254                                                     dev->mode_config.max_height);
2255         mutex_unlock(&dev->mode_config.mutex);
2256         /*
2257          * we shouldn't end up with no modes here.
2258          */
2259         if (count == 0)
2260                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2261
2262         drm_setup_crtcs(fb_helper);
2263
2264         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2265 }
2266 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2267
2268 /**
2269  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2270  *                               probing all the outputs attached to the fb
2271  * @fb_helper: the drm_fb_helper
2272  *
2273  * Scan the connectors attached to the fb_helper and try to put together a
2274  * setup after notification of a change in output configuration.
2275  *
2276  * Called at runtime, takes the mode config locks to be able to check/change the
2277  * modeset configuration. Must be run from process context (which usually means
2278  * either the output polling work or a work item launched from the driver's
2279  * hotplug interrupt).
2280  *
2281  * Note that drivers may call this even before calling
2282  * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2283  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2284  * not miss any hotplug events.
2285  *
2286  * RETURNS:
2287  * 0 on success and a non-zero error code otherwise.
2288  */
2289 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2290 {
2291         struct drm_device *dev = fb_helper->dev;
2292         u32 max_width, max_height;
2293
2294         if (!drm_fbdev_emulation)
2295                 return 0;
2296
2297         mutex_lock(&fb_helper->dev->mode_config.mutex);
2298         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2299                 fb_helper->delayed_hotplug = true;
2300                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2301                 return 0;
2302         }
2303         DRM_DEBUG_KMS("\n");
2304
2305         max_width = fb_helper->fb->width;
2306         max_height = fb_helper->fb->height;
2307
2308         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2309         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2310
2311         drm_modeset_lock_all(dev);
2312         drm_setup_crtcs(fb_helper);
2313         drm_modeset_unlock_all(dev);
2314         drm_fb_helper_set_par(fb_helper->fbdev);
2315
2316         return 0;
2317 }
2318 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2319
2320 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2321  * but the module doesn't depend on any fb console symbols.  At least
2322  * attempt to load fbcon to avoid leaving the system without a usable console.
2323  */
2324 int __init drm_fb_helper_modinit(void)
2325 {
2326 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2327         const char *name = "fbcon";
2328         struct module *fbcon;
2329
2330         mutex_lock(&module_mutex);
2331         fbcon = find_module(name);
2332         mutex_unlock(&module_mutex);
2333
2334         if (!fbcon)
2335                 request_module_nowait(name);
2336 #endif
2337         return 0;
2338 }
2339 EXPORT_SYMBOL(drm_fb_helper_modinit);