drivers/gpu/drm/drm_fb_helper.c

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