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 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  43 MODULE_DESCRIPTION("DRM KMS helper");
  44 MODULE_LICENSE("GPL and additional rights");
  45
  46 static LIST_HEAD(kernel_fb_helper_list);
  47
  48 /**
  49  * DOC: fbdev helpers
  50  *
  51  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  52  * mode setting driver. They can be used mostly independantely from the crtc
  53  * helper functions used by many drivers to implement the kernel mode setting
  54  * interfaces.
  55  *
  56  * Initialization is done as a three-step process with drm_fb_helper_init(),
  57  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  58  * Drivers with fancier requirements than the default beheviour can override the
  59  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  60  *
  61  * At runtime drivers should restore the fbdev console by calling
  62  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  63  * should also notify the fb helper code from updates to the output
  64  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  65  * integration with the output polling code in drm_crtc_helper.c the modeset
  66  * code proves a ->output_poll_changed callback.
  67  *
  68  * All other functions exported by the fb helper library can be used to
  69  * implement the fbdev driver interface by the driver.
  70  */
  71
  72 /**
  73  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  74  *                                             emulation helper
  75  * @fb_helper: fbdev initialized with drm_fb_helper_init
  76  *
  77  * This functions adds all the available connectors for use with the given
  78  * fb_helper. This is a separate step to allow drivers to freely assign
  79  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  80  * not adequate to be used for the fbcon.
  81  *
  82  * Since this is part of the initial setup before the fbdev is published, no
  83  * locking is required.
  84  */
  85 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  86 {
  87         struct drm_device *dev = fb_helper->dev;
  88         struct drm_connector *connector;
  89         int i;
  90
  91         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  92                 struct drm_fb_helper_connector *fb_helper_connector;
  93
  94                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  95                 if (!fb_helper_connector)
  96                         goto fail;
  97
  98                 fb_helper_connector->connector = connector;
  99                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 100         }
 101         return 0;
 102 fail:
 103         for (i = 0; i < fb_helper->connector_count; i++) {
 104                 kfree(fb_helper->connector_info[i]);
 105                 fb_helper->connector_info[i] = NULL;
 106         }
 107         fb_helper->connector_count = 0;
 108         return -ENOMEM;
 109 }
 110 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 111
 112 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 113 {
 114         struct drm_fb_helper_connector *fb_helper_conn;
 115         int i;
 116
 117         for (i = 0; i < fb_helper->connector_count; i++) {
 118                 struct drm_cmdline_mode *mode;
 119                 struct drm_connector *connector;
 120                 char *option = NULL;
 121
 122                 fb_helper_conn = fb_helper->connector_info[i];
 123                 connector = fb_helper_conn->connector;
 124                 mode = &fb_helper_conn->cmdline_mode;
 125
 126                 /* do something on return - turn off connector maybe */
 127                 if (fb_get_options(drm_get_connector_name(connector), &option))
 128                         continue;
 129
 130                 if (drm_mode_parse_command_line_for_connector(option,
 131                                                               connector,
 132                                                               mode)) {
 133                         if (mode->force) {
 134                                 const char *s;
 135                                 switch (mode->force) {
 136                                 case DRM_FORCE_OFF:
 137                                         s = "OFF";
 138                                         break;
 139                                 case DRM_FORCE_ON_DIGITAL:
 140                                         s = "ON - dig";
 141                                         break;
 142                                 default:
 143                                 case DRM_FORCE_ON:
 144                                         s = "ON";
 145                                         break;
 146                                 }
 147
 148                                 DRM_INFO("forcing %s connector %s\n",
 149                                          drm_get_connector_name(connector), s);
 150                                 connector->force = mode->force;
 151                         }
 152
 153                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 154                                       drm_get_connector_name(connector),
 155                                       mode->xres, mode->yres,
 156                                       mode->refresh_specified ? mode->refresh : 60,
 157                                       mode->rb ? " reduced blanking" : "",
 158                                       mode->margins ? " with margins" : "",
 159                                       mode->interlace ?  " interlaced" : "");
 160                 }
 161
 162         }
 163         return 0;
 164 }
 165
 166 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 167 {
 168         uint16_t *r_base, *g_base, *b_base;
 169         int i;
 170
 171         if (helper->funcs->gamma_get == NULL)
 172                 return;
 173
 174         r_base = crtc->gamma_store;
 175         g_base = r_base + crtc->gamma_size;
 176         b_base = g_base + crtc->gamma_size;
 177
 178         for (i = 0; i < crtc->gamma_size; i++)
 179                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 180 }
 181
 182 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 183 {
 184         uint16_t *r_base, *g_base, *b_base;
 185
 186         if (crtc->funcs->gamma_set == NULL)
 187                 return;
 188
 189         r_base = crtc->gamma_store;
 190         g_base = r_base + crtc->gamma_size;
 191         b_base = g_base + crtc->gamma_size;
 192
 193         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 194 }
 195
 196 /**
 197  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 198  * @info: fbdev registered by the helper
 199  */
 200 int drm_fb_helper_debug_enter(struct fb_info *info)
 201 {
 202         struct drm_fb_helper *helper = info->par;
 203         struct drm_crtc_helper_funcs *funcs;
 204         int i;
 205
 206         if (list_empty(&kernel_fb_helper_list))
 207                 return false;
 208
 209         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 210                 for (i = 0; i < helper->crtc_count; i++) {
 211                         struct drm_mode_set *mode_set =
 212                                 &helper->crtc_info[i].mode_set;
 213
 214                         if (!mode_set->crtc->enabled)
 215                                 continue;
 216
 217                         funcs = mode_set->crtc->helper_private;
 218                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 219                         funcs->mode_set_base_atomic(mode_set->crtc,
 220                                                     mode_set->fb,
 221                                                     mode_set->x,
 222                                                     mode_set->y,
 223                                                     ENTER_ATOMIC_MODE_SET);
 224                 }
 225         }
 226
 227         return 0;
 228 }
 229 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 230
 231 /* Find the real fb for a given fb helper CRTC */
 232 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 233 {
 234         struct drm_device *dev = crtc->dev;
 235         struct drm_crtc *c;
 236
 237         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 238                 if (crtc->base.id == c->base.id)
 239                         return c->fb;
 240         }
 241
 242         return NULL;
 243 }
 244
 245 /**
 246  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 247  * @info: fbdev registered by the helper
 248  */
 249 int drm_fb_helper_debug_leave(struct fb_info *info)
 250 {
 251         struct drm_fb_helper *helper = info->par;
 252         struct drm_crtc *crtc;
 253         struct drm_crtc_helper_funcs *funcs;
 254         struct drm_framebuffer *fb;
 255         int i;
 256
 257         for (i = 0; i < helper->crtc_count; i++) {
 258                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 259                 crtc = mode_set->crtc;
 260                 funcs = crtc->helper_private;
 261                 fb = drm_mode_config_fb(crtc);
 262
 263                 if (!crtc->enabled)
 264                         continue;
 265
 266                 if (!fb) {
 267                         DRM_ERROR("no fb to restore??\n");
 268                         continue;
 269                 }
 270
 271                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 272                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 273                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 274         }
 275
 276         return 0;
 277 }
 278 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 279
 280 /**
 281  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 282  * @fb_helper: fbcon to restore
 283  *
 284  * This should be called from driver's drm ->lastclose callback
 285  * when implementing an fbcon on top of kms using this helper. This ensures that
 286  * the user isn't greeted with a black screen when e.g. X dies.
 287  */
 288 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 289 {
 290         struct drm_device *dev = fb_helper->dev;
 291         struct drm_plane *plane;
 292         bool error = false;
 293         int i;
 294
 295         drm_warn_on_modeset_not_all_locked(dev);
 296
 297         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 298                 drm_plane_force_disable(plane);
 299
 300         for (i = 0; i < fb_helper->crtc_count; i++) {
 301                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 302                 struct drm_crtc *crtc = mode_set->crtc;
 303                 int ret;
 304
 305                 if (crtc->funcs->cursor_set) {
 306                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 307                         if (ret)
 308                                 error = true;
 309                 }
 310
 311                 ret = drm_mode_set_config_internal(mode_set);
 312                 if (ret)
 313                         error = true;
 314         }
 315         return error;
 316 }
 317 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 318
 319 /*
 320  * restore fbcon display for all kms driver's using this helper, used for sysrq
 321  * and panic handling.
 322  */
 323 static bool drm_fb_helper_force_kernel_mode(void)
 324 {
 325         bool ret, error = false;
 326         struct drm_fb_helper *helper;
 327
 328         if (list_empty(&kernel_fb_helper_list))
 329                 return false;
 330
 331         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 332                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 333                         continue;
 334
 335                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 336                 if (ret)
 337                         error = true;
 338         }
 339         return error;
 340 }
 341
 342 static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 343                         void *panic_str)
 344 {
 345         /*
 346          * It's a waste of time and effort to switch back to text console
 347          * if the kernel should reboot before panic messages can be seen.
 348          */
 349         if (panic_timeout < 0)
 350                 return 0;
 351
 352         pr_err("panic occurred, switching back to text console\n");
 353         return drm_fb_helper_force_kernel_mode();
 354 }
 355
 356 static struct notifier_block paniced = {
 357         .notifier_call = drm_fb_helper_panic,
 358 };
 359
 360 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 361 {
 362         struct drm_device *dev = fb_helper->dev;
 363         struct drm_crtc *crtc;
 364         int bound = 0, crtcs_bound = 0;
 365
 366         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 367                 if (crtc->fb)
 368                         crtcs_bound++;
 369                 if (crtc->fb == fb_helper->fb)
 370                         bound++;
 371         }
 372
 373         if (bound < crtcs_bound)
 374                 return false;
 375         return true;
 376 }
 377
 378 #ifdef CONFIG_MAGIC_SYSRQ
 379 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 380 {
 381         bool ret;
 382         ret = drm_fb_helper_force_kernel_mode();
 383         if (ret == true)
 384                 DRM_ERROR("Failed to restore crtc configuration\n");
 385 }
 386 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 387
 388 static void drm_fb_helper_sysrq(int dummy1)
 389 {
 390         schedule_work(&drm_fb_helper_restore_work);
 391 }
 392
 393 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 394         .handler = drm_fb_helper_sysrq,
 395         .help_msg = "force-fb(V)",
 396         .action_msg = "Restore framebuffer console",
 397 };
 398 #else
 399 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 400 #endif
 401
 402 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 403 {
 404         struct drm_fb_helper *fb_helper = info->par;
 405         struct drm_device *dev = fb_helper->dev;
 406         struct drm_crtc *crtc;
 407         struct drm_connector *connector;
 408         int i, j;
 409
 410         /*
 411          * fbdev->blank can be called from irq context in case of a panic.
 412          * Since we already have our own special panic handler which will
 413          * restore the fbdev console mode completely, just bail out early.
 414          */
 415         if (oops_in_progress)
 416                 return;
 417
 418         /*
 419          * fbdev->blank can be called from irq context in case of a panic.
 420          * Since we already have our own special panic handler which will
 421          * restore the fbdev console mode completely, just bail out early.
 422          */
 423         if (oops_in_progress)
 424                 return;
 425
 426         /*
 427          * For each CRTC in this fb, turn the connectors on/off.
 428          */
 429         drm_modeset_lock_all(dev);
 430         if (!drm_fb_helper_is_bound(fb_helper)) {
 431                 drm_modeset_unlock_all(dev);
 432                 return;
 433         }
 434
 435         for (i = 0; i < fb_helper->crtc_count; i++) {
 436                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 437
 438                 if (!crtc->enabled)
 439                         continue;
 440
 441                 /* Walk the connectors & encoders on this fb turning them on/off */
 442                 for (j = 0; j < fb_helper->connector_count; j++) {
 443                         connector = fb_helper->connector_info[j]->connector;
 444                         connector->funcs->dpms(connector, dpms_mode);
 445                         drm_object_property_set_value(&connector->base,
 446                                 dev->mode_config.dpms_property, dpms_mode);
 447                 }
 448         }
 449         drm_modeset_unlock_all(dev);
 450 }
 451
 452 /**
 453  * drm_fb_helper_blank - implementation for ->fb_blank
 454  * @blank: desired blanking state
 455  * @info: fbdev registered by the helper
 456  */
 457 int drm_fb_helper_blank(int blank, struct fb_info *info)
 458 {
 459         switch (blank) {
 460         /* Display: On; HSync: On, VSync: On */
 461         case FB_BLANK_UNBLANK:
 462                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 463                 break;
 464         /* Display: Off; HSync: On, VSync: On */
 465         case FB_BLANK_NORMAL:
 466                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 467                 break;
 468         /* Display: Off; HSync: Off, VSync: On */
 469         case FB_BLANK_HSYNC_SUSPEND:
 470                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 471                 break;
 472         /* Display: Off; HSync: On, VSync: Off */
 473         case FB_BLANK_VSYNC_SUSPEND:
 474                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 475                 break;
 476         /* Display: Off; HSync: Off, VSync: Off */
 477         case FB_BLANK_POWERDOWN:
 478                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 479                 break;
 480         }
 481         return 0;
 482 }
 483 EXPORT_SYMBOL(drm_fb_helper_blank);
 484
 485 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 486 {
 487         int i;
 488
 489         for (i = 0; i < helper->connector_count; i++)
 490                 kfree(helper->connector_info[i]);
 491         kfree(helper->connector_info);
 492         for (i = 0; i < helper->crtc_count; i++) {
 493                 kfree(helper->crtc_info[i].mode_set.connectors);
 494                 if (helper->crtc_info[i].mode_set.mode)
 495                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 496         }
 497         kfree(helper->crtc_info);
 498 }
 499
 500 /**
 501  * drm_fb_helper_init - initialize a drm_fb_helper structure
 502  * @dev: drm device
 503  * @fb_helper: driver-allocated fbdev helper structure to initialize
 504  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 505  * @max_conn_count: max connector count
 506  *
 507  * This allocates the structures for the fbdev helper with the given limits.
 508  * Note that this won't yet touch the hardware (through the driver interfaces)
 509  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 510  * to allow driver writes more control over the exact init sequence.
 511  *
 512  * Drivers must set fb_helper->funcs before calling
 513  * drm_fb_helper_initial_config().
 514  *
 515  * RETURNS:
 516  * Zero if everything went ok, nonzero otherwise.
 517  */
 518 int drm_fb_helper_init(struct drm_device *dev,
 519                        struct drm_fb_helper *fb_helper,
 520                        int crtc_count, int max_conn_count)
 521 {
 522         struct drm_crtc *crtc;
 523         int i;
 524
 525         fb_helper->dev = dev;
 526
 527         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 528
 529         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 530         if (!fb_helper->crtc_info)
 531                 return -ENOMEM;
 532
 533         fb_helper->crtc_count = crtc_count;
 534         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 535         if (!fb_helper->connector_info) {
 536                 kfree(fb_helper->crtc_info);
 537                 return -ENOMEM;
 538         }
 539         fb_helper->connector_count = 0;
 540
 541         for (i = 0; i < crtc_count; i++) {
 542                 fb_helper->crtc_info[i].mode_set.connectors =
 543                         kcalloc(max_conn_count,
 544                                 sizeof(struct drm_connector *),
 545                                 GFP_KERNEL);
 546
 547                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 548                         goto out_free;
 549                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 550         }
 551
 552         i = 0;
 553         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 554                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 555                 i++;
 556         }
 557
 558         return 0;
 559 out_free:
 560         drm_fb_helper_crtc_free(fb_helper);
 561         return -ENOMEM;
 562 }
 563 EXPORT_SYMBOL(drm_fb_helper_init);
 564
 565 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 566 {
 567         if (!list_empty(&fb_helper->kernel_fb_list)) {
 568                 list_del(&fb_helper->kernel_fb_list);
 569                 if (list_empty(&kernel_fb_helper_list)) {
 570                         pr_info("drm: unregistered panic notifier\n");
 571                         atomic_notifier_chain_unregister(&panic_notifier_list,
 572                                                          &paniced);
 573                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 574                 }
 575         }
 576
 577         drm_fb_helper_crtc_free(fb_helper);
 578
 579 }
 580 EXPORT_SYMBOL(drm_fb_helper_fini);
 581
 582 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 583                      u16 blue, u16 regno, struct fb_info *info)
 584 {
 585         struct drm_fb_helper *fb_helper = info->par;
 586         struct drm_framebuffer *fb = fb_helper->fb;
 587         int pindex;
 588
 589         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 590                 u32 *palette;
 591                 u32 value;
 592                 /* place color in psuedopalette */
 593                 if (regno > 16)
 594                         return -EINVAL;
 595                 palette = (u32 *)info->pseudo_palette;
 596                 red >>= (16 - info->var.red.length);
 597                 green >>= (16 - info->var.green.length);
 598                 blue >>= (16 - info->var.blue.length);
 599                 value = (red << info->var.red.offset) |
 600                         (green << info->var.green.offset) |
 601                         (blue << info->var.blue.offset);
 602                 if (info->var.transp.length > 0) {
 603                         u32 mask = (1 << info->var.transp.length) - 1;
 604                         mask <<= info->var.transp.offset;
 605                         value |= mask;
 606                 }
 607                 palette[regno] = value;
 608                 return 0;
 609         }
 610
 611         /*
 612          * The driver really shouldn't advertise pseudo/directcolor
 613          * visuals if it can't deal with the palette.
 614          */
 615         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 616                     !fb_helper->funcs->gamma_get))
 617                 return -EINVAL;
 618
 619         pindex = regno;
 620
 621         if (fb->bits_per_pixel == 16) {
 622                 pindex = regno << 3;
 623
 624                 if (fb->depth == 16 && regno > 63)
 625                         return -EINVAL;
 626                 if (fb->depth == 15 && regno > 31)
 627                         return -EINVAL;
 628
 629                 if (fb->depth == 16) {
 630                         u16 r, g, b;
 631                         int i;
 632                         if (regno < 32) {
 633                                 for (i = 0; i < 8; i++)
 634                                         fb_helper->funcs->gamma_set(crtc, red,
 635                                                 green, blue, pindex + i);
 636                         }
 637
 638                         fb_helper->funcs->gamma_get(crtc, &r,
 639                                                     &g, &b,
 640                                                     pindex >> 1);
 641
 642                         for (i = 0; i < 4; i++)
 643                                 fb_helper->funcs->gamma_set(crtc, r,
 644                                                             green, b,
 645                                                             (pindex >> 1) + i);
 646                 }
 647         }
 648
 649         if (fb->depth != 16)
 650                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 651         return 0;
 652 }
 653
 654 /**
 655  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 656  * @cmap: cmap to set
 657  * @info: fbdev registered by the helper
 658  */
 659 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 660 {
 661         struct drm_fb_helper *fb_helper = info->par;
 662         struct drm_device *dev = fb_helper->dev;
 663         struct drm_crtc_helper_funcs *crtc_funcs;
 664         u16 *red, *green, *blue, *transp;
 665         struct drm_crtc *crtc;
 666         int i, j, rc = 0;
 667         int start;
 668
 669         drm_modeset_lock_all(dev);
 670         if (!drm_fb_helper_is_bound(fb_helper)) {
 671                 drm_modeset_unlock_all(dev);
 672                 return -EBUSY;
 673         }
 674
 675         for (i = 0; i < fb_helper->crtc_count; i++) {
 676                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 677                 crtc_funcs = crtc->helper_private;
 678
 679                 red = cmap->red;
 680                 green = cmap->green;
 681                 blue = cmap->blue;
 682                 transp = cmap->transp;
 683                 start = cmap->start;
 684
 685                 for (j = 0; j < cmap->len; j++) {
 686                         u16 hred, hgreen, hblue, htransp = 0xffff;
 687
 688                         hred = *red++;
 689                         hgreen = *green++;
 690                         hblue = *blue++;
 691
 692                         if (transp)
 693                                 htransp = *transp++;
 694
 695                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 696                         if (rc)
 697                                 goto out;
 698                 }
 699                 if (crtc_funcs->load_lut)
 700                         crtc_funcs->load_lut(crtc);
 701         }
 702  out:
 703         drm_modeset_unlock_all(dev);
 704         return rc;
 705 }
 706 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 707
 708 /**
 709  * drm_fb_helper_check_var - implementation for ->fb_check_var
 710  * @var: screeninfo to check
 711  * @info: fbdev registered by the helper
 712  */
 713 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 714                             struct fb_info *info)
 715 {
 716         struct drm_fb_helper *fb_helper = info->par;
 717         struct drm_framebuffer *fb = fb_helper->fb;
 718         int depth;
 719
 720         if (var->pixclock != 0 || in_dbg_master())
 721                 return -EINVAL;
 722
 723         /* Need to resize the fb object !!! */
 724         if (var->bits_per_pixel > fb->bits_per_pixel ||
 725             var->xres > fb->width || var->yres > fb->height ||
 726             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 727                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 728                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 729                           var->xres, var->yres, var->bits_per_pixel,
 730                           var->xres_virtual, var->yres_virtual,
 731                           fb->width, fb->height, fb->bits_per_pixel);
 732                 return -EINVAL;
 733         }
 734
 735         switch (var->bits_per_pixel) {
 736         case 16:
 737                 depth = (var->green.length == 6) ? 16 : 15;
 738                 break;
 739         case 32:
 740                 depth = (var->transp.length > 0) ? 32 : 24;
 741                 break;
 742         default:
 743                 depth = var->bits_per_pixel;
 744                 break;
 745         }
 746
 747         switch (depth) {
 748         case 8:
 749                 var->red.offset = 0;
 750                 var->green.offset = 0;
 751                 var->blue.offset = 0;
 752                 var->red.length = 8;
 753                 var->green.length = 8;
 754                 var->blue.length = 8;
 755                 var->transp.length = 0;
 756                 var->transp.offset = 0;
 757                 break;
 758         case 15:
 759                 var->red.offset = 10;
 760                 var->green.offset = 5;
 761                 var->blue.offset = 0;
 762                 var->red.length = 5;
 763                 var->green.length = 5;
 764                 var->blue.length = 5;
 765                 var->transp.length = 1;
 766                 var->transp.offset = 15;
 767                 break;
 768         case 16:
 769                 var->red.offset = 11;
 770                 var->green.offset = 5;
 771                 var->blue.offset = 0;
 772                 var->red.length = 5;
 773                 var->green.length = 6;
 774                 var->blue.length = 5;
 775                 var->transp.length = 0;
 776                 var->transp.offset = 0;
 777                 break;
 778         case 24:
 779                 var->red.offset = 16;
 780                 var->green.offset = 8;
 781                 var->blue.offset = 0;
 782                 var->red.length = 8;
 783                 var->green.length = 8;
 784                 var->blue.length = 8;
 785                 var->transp.length = 0;
 786                 var->transp.offset = 0;
 787                 break;
 788         case 32:
 789                 var->red.offset = 16;
 790                 var->green.offset = 8;
 791                 var->blue.offset = 0;
 792                 var->red.length = 8;
 793                 var->green.length = 8;
 794                 var->blue.length = 8;
 795                 var->transp.length = 8;
 796                 var->transp.offset = 24;
 797                 break;
 798         default:
 799                 return -EINVAL;
 800         }
 801         return 0;
 802 }
 803 EXPORT_SYMBOL(drm_fb_helper_check_var);
 804
 805 /**
 806  * drm_fb_helper_set_par - implementation for ->fb_set_par
 807  * @info: fbdev registered by the helper
 808  *
 809  * This will let fbcon do the mode init and is called at initialization time by
 810  * the fbdev core when registering the driver, and later on through the hotplug
 811  * callback.
 812  */
 813 int drm_fb_helper_set_par(struct fb_info *info)
 814 {
 815         struct drm_fb_helper *fb_helper = info->par;
 816         struct drm_device *dev = fb_helper->dev;
 817         struct fb_var_screeninfo *var = &info->var;
 818         int ret;
 819         int i;
 820
 821         if (var->pixclock != 0) {
 822                 DRM_ERROR("PIXEL CLOCK SET\n");
 823                 return -EINVAL;
 824         }
 825
 826         drm_modeset_lock_all(dev);
 827         for (i = 0; i < fb_helper->crtc_count; i++) {
 828                 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
 829                 if (ret) {
 830                         drm_modeset_unlock_all(dev);
 831                         return ret;
 832                 }
 833         }
 834         drm_modeset_unlock_all(dev);
 835
 836         if (fb_helper->delayed_hotplug) {
 837                 fb_helper->delayed_hotplug = false;
 838                 drm_fb_helper_hotplug_event(fb_helper);
 839         }
 840         return 0;
 841 }
 842 EXPORT_SYMBOL(drm_fb_helper_set_par);
 843
 844 /**
 845  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 846  * @var: updated screen information
 847  * @info: fbdev registered by the helper
 848  */
 849 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 850                               struct fb_info *info)
 851 {
 852         struct drm_fb_helper *fb_helper = info->par;
 853         struct drm_device *dev = fb_helper->dev;
 854         struct drm_mode_set *modeset;
 855         struct drm_crtc *crtc;
 856         int ret = 0;
 857         int i;
 858
 859         drm_modeset_lock_all(dev);
 860         if (!drm_fb_helper_is_bound(fb_helper)) {
 861                 drm_modeset_unlock_all(dev);
 862                 return -EBUSY;
 863         }
 864
 865         for (i = 0; i < fb_helper->crtc_count; i++) {
 866                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 867
 868                 modeset = &fb_helper->crtc_info[i].mode_set;
 869
 870                 modeset->x = var->xoffset;
 871                 modeset->y = var->yoffset;
 872
 873                 if (modeset->num_connectors) {
 874                         ret = drm_mode_set_config_internal(modeset);
 875                         if (!ret) {
 876                                 info->var.xoffset = var->xoffset;
 877                                 info->var.yoffset = var->yoffset;
 878                         }
 879                 }
 880         }
 881         drm_modeset_unlock_all(dev);
 882         return ret;
 883 }
 884 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 885
 886 /*
 887  * Allocates the backing storage and sets up the fbdev info structure through
 888  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 889  * notifier.
 890  */
 891 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 892                                          int preferred_bpp)
 893 {
 894         int ret = 0;
 895         int crtc_count = 0;
 896         int i;
 897         struct fb_info *info;
 898         struct drm_fb_helper_surface_size sizes;
 899         int gamma_size = 0;
 900
 901         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 902         sizes.surface_depth = 24;
 903         sizes.surface_bpp = 32;
 904         sizes.fb_width = (unsigned)-1;
 905         sizes.fb_height = (unsigned)-1;
 906
 907         /* if driver picks 8 or 16 by default use that
 908            for both depth/bpp */
 909         if (preferred_bpp != sizes.surface_bpp)
 910                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 911
 912         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 913         for (i = 0; i < fb_helper->connector_count; i++) {
 914                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 915                 struct drm_cmdline_mode *cmdline_mode;
 916
 917                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 918
 919                 if (cmdline_mode->bpp_specified) {
 920                         switch (cmdline_mode->bpp) {
 921                         case 8:
 922                                 sizes.surface_depth = sizes.surface_bpp = 8;
 923                                 break;
 924                         case 15:
 925                                 sizes.surface_depth = 15;
 926                                 sizes.surface_bpp = 16;
 927                                 break;
 928                         case 16:
 929                                 sizes.surface_depth = sizes.surface_bpp = 16;
 930                                 break;
 931                         case 24:
 932                                 sizes.surface_depth = sizes.surface_bpp = 24;
 933                                 break;
 934                         case 32:
 935                                 sizes.surface_depth = 24;
 936                                 sizes.surface_bpp = 32;
 937                                 break;
 938                         }
 939                         break;
 940                 }
 941         }
 942
 943         crtc_count = 0;
 944         for (i = 0; i < fb_helper->crtc_count; i++) {
 945                 struct drm_display_mode *desired_mode;
 946                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 947
 948                 if (desired_mode) {
 949                         if (gamma_size == 0)
 950                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 951                         if (desired_mode->hdisplay < sizes.fb_width)
 952                                 sizes.fb_width = desired_mode->hdisplay;
 953                         if (desired_mode->vdisplay < sizes.fb_height)
 954                                 sizes.fb_height = desired_mode->vdisplay;
 955                         if (desired_mode->hdisplay > sizes.surface_width)
 956                                 sizes.surface_width = desired_mode->hdisplay;
 957                         if (desired_mode->vdisplay > sizes.surface_height)
 958                                 sizes.surface_height = desired_mode->vdisplay;
 959                         crtc_count++;
 960                 }
 961         }
 962
 963         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 964                 /* hmm everyone went away - assume VGA cable just fell out
 965                    and will come back later. */
 966                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 967                 sizes.fb_width = sizes.surface_width = 1024;
 968                 sizes.fb_height = sizes.surface_height = 768;
 969         }
 970
 971         /* push down into drivers */
 972         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 973         if (ret < 0)
 974                 return ret;
 975
 976         info = fb_helper->fbdev;
 977
 978         /*
 979          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 980          * events, but at init time drm_setup_crtcs needs to be called before
 981          * the fb is allocated (since we need to figure out the desired size of
 982          * the fb before we can allocate it ...). Hence we need to fix things up
 983          * here again.
 984          */
 985         for (i = 0; i < fb_helper->crtc_count; i++)
 986                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 987                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 988
 989
 990         info->var.pixclock = 0;
 991         if (register_framebuffer(info) < 0)
 992                 return -EINVAL;
 993
 994         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 995                         info->node, info->fix.id);
 996
 997         /* Switch back to kernel console on panic */
 998         /* multi card linked list maybe */
 999         if (list_empty(&kernel_fb_helper_list)) {
1000                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
1001                 atomic_notifier_chain_register(&panic_notifier_list,
1002                                                &paniced);
1003                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1004         }
1005
1006         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1007
1008         return 0;
1009 }
1010
1011 /**
1012  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1013  * @info: fbdev registered by the helper
1014  * @pitch: desired pitch
1015  * @depth: desired depth
1016  *
1017  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1018  * fbdev emulations. Drivers which support acceleration methods which impose
1019  * additional constraints need to set up their own limits.
1020  *
1021  * Drivers should call this (or their equivalent setup code) from their
1022  * ->fb_probe callback.
1023  */
1024 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1025                             uint32_t depth)
1026 {
1027         info->fix.type = FB_TYPE_PACKED_PIXELS;
1028         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1029                 FB_VISUAL_TRUECOLOR;
1030         info->fix.mmio_start = 0;
1031         info->fix.mmio_len = 0;
1032         info->fix.type_aux = 0;
1033         info->fix.xpanstep = 1; /* doing it in hw */
1034         info->fix.ypanstep = 1; /* doing it in hw */
1035         info->fix.ywrapstep = 0;
1036         info->fix.accel = FB_ACCEL_NONE;
1037         info->fix.type_aux = 0;
1038
1039         info->fix.line_length = pitch;
1040         return;
1041 }
1042 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1043
1044 /**
1045  * drm_fb_helper_fill_var - initalizes variable fbdev information
1046  * @info: fbdev instance to set up
1047  * @fb_helper: fb helper instance to use as template
1048  * @fb_width: desired fb width
1049  * @fb_height: desired fb height
1050  *
1051  * Sets up the variable fbdev metainformation from the given fb helper instance
1052  * and the drm framebuffer allocated in fb_helper->fb.
1053  *
1054  * Drivers should call this (or their equivalent setup code) from their
1055  * ->fb_probe callback after having allocated the fbdev backing
1056  * storage framebuffer.
1057  */
1058 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1059                             uint32_t fb_width, uint32_t fb_height)
1060 {
1061         struct drm_framebuffer *fb = fb_helper->fb;
1062         info->pseudo_palette = fb_helper->pseudo_palette;
1063         info->var.xres_virtual = fb->width;
1064         info->var.yres_virtual = fb->height;
1065         info->var.bits_per_pixel = fb->bits_per_pixel;
1066         info->var.accel_flags = FB_ACCELF_TEXT;
1067         info->var.xoffset = 0;
1068         info->var.yoffset = 0;
1069         info->var.activate = FB_ACTIVATE_NOW;
1070         info->var.height = -1;
1071         info->var.width = -1;
1072
1073         switch (fb->depth) {
1074         case 8:
1075                 info->var.red.offset = 0;
1076                 info->var.green.offset = 0;
1077                 info->var.blue.offset = 0;
1078                 info->var.red.length = 8; /* 8bit DAC */
1079                 info->var.green.length = 8;
1080                 info->var.blue.length = 8;
1081                 info->var.transp.offset = 0;
1082                 info->var.transp.length = 0;
1083                 break;
1084         case 15:
1085                 info->var.red.offset = 10;
1086                 info->var.green.offset = 5;
1087                 info->var.blue.offset = 0;
1088                 info->var.red.length = 5;
1089                 info->var.green.length = 5;
1090                 info->var.blue.length = 5;
1091                 info->var.transp.offset = 15;
1092                 info->var.transp.length = 1;
1093                 break;
1094         case 16:
1095                 info->var.red.offset = 11;
1096                 info->var.green.offset = 5;
1097                 info->var.blue.offset = 0;
1098                 info->var.red.length = 5;
1099                 info->var.green.length = 6;
1100                 info->var.blue.length = 5;
1101                 info->var.transp.offset = 0;
1102                 break;
1103         case 24:
1104                 info->var.red.offset = 16;
1105                 info->var.green.offset = 8;
1106                 info->var.blue.offset = 0;
1107                 info->var.red.length = 8;
1108                 info->var.green.length = 8;
1109                 info->var.blue.length = 8;
1110                 info->var.transp.offset = 0;
1111                 info->var.transp.length = 0;
1112                 break;
1113         case 32:
1114                 info->var.red.offset = 16;
1115                 info->var.green.offset = 8;
1116                 info->var.blue.offset = 0;
1117                 info->var.red.length = 8;
1118                 info->var.green.length = 8;
1119                 info->var.blue.length = 8;
1120                 info->var.transp.offset = 24;
1121                 info->var.transp.length = 8;
1122                 break;
1123         default:
1124                 break;
1125         }
1126
1127         info->var.xres = fb_width;
1128         info->var.yres = fb_height;
1129 }
1130 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1131
1132 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1133                                                uint32_t maxX,
1134                                                uint32_t maxY)
1135 {
1136         struct drm_connector *connector;
1137         int count = 0;
1138         int i;
1139
1140         for (i = 0; i < fb_helper->connector_count; i++) {
1141                 connector = fb_helper->connector_info[i]->connector;
1142                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1143         }
1144
1145         return count;
1146 }
1147
1148 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1149 {
1150         struct drm_display_mode *mode;
1151
1152         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1153                 if (drm_mode_width(mode) > width ||
1154                     drm_mode_height(mode) > height)
1155                         continue;
1156                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1157                         return mode;
1158         }
1159         return NULL;
1160 }
1161
1162 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1163 {
1164         struct drm_cmdline_mode *cmdline_mode;
1165         cmdline_mode = &fb_connector->cmdline_mode;
1166         return cmdline_mode->specified;
1167 }
1168
1169 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1170                                                       int width, int height)
1171 {
1172         struct drm_cmdline_mode *cmdline_mode;
1173         struct drm_display_mode *mode = NULL;
1174
1175         cmdline_mode = &fb_helper_conn->cmdline_mode;
1176         if (cmdline_mode->specified == false)
1177                 return mode;
1178
1179         /* attempt to find a matching mode in the list of modes
1180          *  we have gotten so far, if not add a CVT mode that conforms
1181          */
1182         if (cmdline_mode->rb || cmdline_mode->margins)
1183                 goto create_mode;
1184
1185         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1186                 /* check width/height */
1187                 if (mode->hdisplay != cmdline_mode->xres ||
1188                     mode->vdisplay != cmdline_mode->yres)
1189                         continue;
1190
1191                 if (cmdline_mode->refresh_specified) {
1192                         if (mode->vrefresh != cmdline_mode->refresh)
1193                                 continue;
1194                 }
1195
1196                 if (cmdline_mode->interlace) {
1197                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1198                                 continue;
1199                 }
1200                 return mode;
1201         }
1202
1203 create_mode:
1204         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1205                                                  cmdline_mode);
1206         list_add(&mode->head, &fb_helper_conn->connector->modes);
1207         return mode;
1208 }
1209
1210 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1211 {
1212         bool enable;
1213
1214         if (strict)
1215                 enable = connector->status == connector_status_connected;
1216         else
1217                 enable = connector->status != connector_status_disconnected;
1218
1219         return enable;
1220 }
1221
1222 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1223                                   bool *enabled)
1224 {
1225         bool any_enabled = false;
1226         struct drm_connector *connector;
1227         int i = 0;
1228
1229         for (i = 0; i < fb_helper->connector_count; i++) {
1230                 connector = fb_helper->connector_info[i]->connector;
1231                 enabled[i] = drm_connector_enabled(connector, true);
1232                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1233                           enabled[i] ? "yes" : "no");
1234                 any_enabled |= enabled[i];
1235         }
1236
1237         if (any_enabled)
1238                 return;
1239
1240         for (i = 0; i < fb_helper->connector_count; i++) {
1241                 connector = fb_helper->connector_info[i]->connector;
1242                 enabled[i] = drm_connector_enabled(connector, false);
1243         }
1244 }
1245
1246 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1247                               struct drm_display_mode **modes,
1248                               bool *enabled, int width, int height)
1249 {
1250         int count, i, j;
1251         bool can_clone = false;
1252         struct drm_fb_helper_connector *fb_helper_conn;
1253         struct drm_display_mode *dmt_mode, *mode;
1254
1255         /* only contemplate cloning in the single crtc case */
1256         if (fb_helper->crtc_count > 1)
1257                 return false;
1258
1259         count = 0;
1260         for (i = 0; i < fb_helper->connector_count; i++) {
1261                 if (enabled[i])
1262                         count++;
1263         }
1264
1265         /* only contemplate cloning if more than one connector is enabled */
1266         if (count <= 1)
1267                 return false;
1268
1269         /* check the command line or if nothing common pick 1024x768 */
1270         can_clone = true;
1271         for (i = 0; i < fb_helper->connector_count; i++) {
1272                 if (!enabled[i])
1273                         continue;
1274                 fb_helper_conn = fb_helper->connector_info[i];
1275                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1276                 if (!modes[i]) {
1277                         can_clone = false;
1278                         break;
1279                 }
1280                 for (j = 0; j < i; j++) {
1281                         if (!enabled[j])
1282                                 continue;
1283                         if (!drm_mode_equal(modes[j], modes[i]))
1284                                 can_clone = false;
1285                 }
1286         }
1287
1288         if (can_clone) {
1289                 DRM_DEBUG_KMS("can clone using command line\n");
1290                 return true;
1291         }
1292
1293         /* try and find a 1024x768 mode on each connector */
1294         can_clone = true;
1295         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1296
1297         for (i = 0; i < fb_helper->connector_count; i++) {
1298
1299                 if (!enabled[i])
1300                         continue;
1301
1302                 fb_helper_conn = fb_helper->connector_info[i];
1303                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1304                         if (drm_mode_equal(mode, dmt_mode))
1305                                 modes[i] = mode;
1306                 }
1307                 if (!modes[i])
1308                         can_clone = false;
1309         }
1310
1311         if (can_clone) {
1312                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1313                 return true;
1314         }
1315         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1316         return false;
1317 }
1318
1319 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1320                                  struct drm_display_mode **modes,
1321                                  bool *enabled, int width, int height)
1322 {
1323         struct drm_fb_helper_connector *fb_helper_conn;
1324         int i;
1325
1326         for (i = 0; i < fb_helper->connector_count; i++) {
1327                 fb_helper_conn = fb_helper->connector_info[i];
1328
1329                 if (enabled[i] == false)
1330                         continue;
1331
1332                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1333                               fb_helper_conn->connector->base.id);
1334
1335                 /* got for command line mode first */
1336                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1337                 if (!modes[i]) {
1338                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1339                                       fb_helper_conn->connector->base.id);
1340                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1341                 }
1342                 /* No preferred modes, pick one off the list */
1343                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1344                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1345                                 break;
1346                 }
1347                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1348                           "none");
1349         }
1350         return true;
1351 }
1352
1353 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1354                           struct drm_fb_helper_crtc **best_crtcs,
1355                           struct drm_display_mode **modes,
1356                           int n, int width, int height)
1357 {
1358         int c, o;
1359         struct drm_device *dev = fb_helper->dev;
1360         struct drm_connector *connector;
1361         struct drm_connector_helper_funcs *connector_funcs;
1362         struct drm_encoder *encoder;
1363         struct drm_fb_helper_crtc *best_crtc;
1364         int my_score, best_score, score;
1365         struct drm_fb_helper_crtc **crtcs, *crtc;
1366         struct drm_fb_helper_connector *fb_helper_conn;
1367
1368         if (n == fb_helper->connector_count)
1369                 return 0;
1370
1371         fb_helper_conn = fb_helper->connector_info[n];
1372         connector = fb_helper_conn->connector;
1373
1374         best_crtcs[n] = NULL;
1375         best_crtc = NULL;
1376         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1377         if (modes[n] == NULL)
1378                 return best_score;
1379
1380         crtcs = kzalloc(dev->mode_config.num_connector *
1381                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1382         if (!crtcs)
1383                 return best_score;
1384
1385         my_score = 1;
1386         if (connector->status == connector_status_connected)
1387                 my_score++;
1388         if (drm_has_cmdline_mode(fb_helper_conn))
1389                 my_score++;
1390         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1391                 my_score++;
1392
1393         connector_funcs = connector->helper_private;
1394         encoder = connector_funcs->best_encoder(connector);
1395         if (!encoder)
1396                 goto out;
1397
1398         /* select a crtc for this connector and then attempt to configure
1399            remaining connectors */
1400         for (c = 0; c < fb_helper->crtc_count; c++) {
1401                 crtc = &fb_helper->crtc_info[c];
1402
1403                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1404                         continue;
1405
1406                 for (o = 0; o < n; o++)
1407                         if (best_crtcs[o] == crtc)
1408                                 break;
1409
1410                 if (o < n) {
1411                         /* ignore cloning unless only a single crtc */
1412                         if (fb_helper->crtc_count > 1)
1413                                 continue;
1414
1415                         if (!drm_mode_equal(modes[o], modes[n]))
1416                                 continue;
1417                 }
1418
1419                 crtcs[n] = crtc;
1420                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1421                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1422                                                   width, height);
1423                 if (score > best_score) {
1424                         best_crtc = crtc;
1425                         best_score = score;
1426                         memcpy(best_crtcs, crtcs,
1427                                dev->mode_config.num_connector *
1428                                sizeof(struct drm_fb_helper_crtc *));
1429                 }
1430         }
1431 out:
1432         kfree(crtcs);
1433         return best_score;
1434 }
1435
1436 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1437 {
1438         struct drm_device *dev = fb_helper->dev;
1439         struct drm_fb_helper_crtc **crtcs;
1440         struct drm_display_mode **modes;
1441         struct drm_mode_set *modeset;
1442         bool *enabled;
1443         int width, height;
1444         int i;
1445
1446         DRM_DEBUG_KMS("\n");
1447
1448         width = dev->mode_config.max_width;
1449         height = dev->mode_config.max_height;
1450
1451         crtcs = kcalloc(dev->mode_config.num_connector,
1452                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1453         modes = kcalloc(dev->mode_config.num_connector,
1454                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1455         enabled = kcalloc(dev->mode_config.num_connector,
1456                           sizeof(bool), GFP_KERNEL);
1457         if (!crtcs || !modes || !enabled) {
1458                 DRM_ERROR("Memory allocation failed\n");
1459                 goto out;
1460         }
1461
1462
1463         drm_enable_connectors(fb_helper, enabled);
1464
1465         if (!(fb_helper->funcs->initial_config &&
1466               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1467                                                enabled, width, height))) {
1468                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1469                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1470
1471                 if (!drm_target_cloned(fb_helper,
1472                                        modes, enabled, width, height) &&
1473                     !drm_target_preferred(fb_helper,
1474                                           modes, enabled, width, height))
1475                         DRM_ERROR("Unable to find initial modes\n");
1476
1477                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1478                               width, height);
1479
1480                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1481         }
1482
1483         /* need to set the modesets up here for use later */
1484         /* fill out the connector<->crtc mappings into the modesets */
1485         for (i = 0; i < fb_helper->crtc_count; i++) {
1486                 modeset = &fb_helper->crtc_info[i].mode_set;
1487                 modeset->num_connectors = 0;
1488                 modeset->fb = NULL;
1489         }
1490
1491         for (i = 0; i < fb_helper->connector_count; i++) {
1492                 struct drm_display_mode *mode = modes[i];
1493                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1494                 modeset = &fb_crtc->mode_set;
1495
1496                 if (mode && fb_crtc) {
1497                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1498                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1499                         fb_crtc->desired_mode = mode;
1500                         if (modeset->mode)
1501                                 drm_mode_destroy(dev, modeset->mode);
1502                         modeset->mode = drm_mode_duplicate(dev,
1503                                                            fb_crtc->desired_mode);
1504                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1505                         modeset->fb = fb_helper->fb;
1506                 }
1507         }
1508
1509         /* Clear out any old modes if there are no more connected outputs. */
1510         for (i = 0; i < fb_helper->crtc_count; i++) {
1511                 modeset = &fb_helper->crtc_info[i].mode_set;
1512                 if (modeset->num_connectors == 0) {
1513                         BUG_ON(modeset->fb);
1514                         BUG_ON(modeset->num_connectors);
1515                         if (modeset->mode)
1516                                 drm_mode_destroy(dev, modeset->mode);
1517                         modeset->mode = NULL;
1518                 }
1519         }
1520 out:
1521         kfree(crtcs);
1522         kfree(modes);
1523         kfree(enabled);
1524 }
1525
1526 /**
1527  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1528  * @fb_helper: fb_helper device struct
1529  * @bpp_sel: bpp value to use for the framebuffer configuration
1530  *
1531  * Scans the CRTCs and connectors and tries to put together an initial setup.
1532  * At the moment, this is a cloned configuration across all heads with
1533  * a new framebuffer object as the backing store.
1534  *
1535  * Note that this also registers the fbdev and so allows userspace to call into
1536  * the driver through the fbdev interfaces.
1537  *
1538  * This function will call down into the ->fb_probe callback to let
1539  * the driver allocate and initialize the fbdev info structure and the drm
1540  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1541  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1542  * values for the fbdev info structure.
1543  *
1544  * RETURNS:
1545  * Zero if everything went ok, nonzero otherwise.
1546  */
1547 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1548 {
1549         struct drm_device *dev = fb_helper->dev;
1550         int count = 0;
1551
1552         drm_fb_helper_parse_command_line(fb_helper);
1553
1554         count = drm_fb_helper_probe_connector_modes(fb_helper,
1555                                                     dev->mode_config.max_width,
1556                                                     dev->mode_config.max_height);
1557         /*
1558          * we shouldn't end up with no modes here.
1559          */
1560         if (count == 0)
1561                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1562
1563         drm_setup_crtcs(fb_helper);
1564
1565         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1566 }
1567 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1568
1569 /**
1570  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1571  *                               probing all the outputs attached to the fb
1572  * @fb_helper: the drm_fb_helper
1573  *
1574  * Scan the connectors attached to the fb_helper and try to put together a
1575  * setup after *notification of a change in output configuration.
1576  *
1577  * Called at runtime, takes the mode config locks to be able to check/change the
1578  * modeset configuration. Must be run from process context (which usually means
1579  * either the output polling work or a work item launched from the driver's
1580  * hotplug interrupt).
1581  *
1582  * Note that the driver must ensure that this is only called _after_ the fb has
1583  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1584  *
1585  * RETURNS:
1586  * 0 on success and a non-zero error code otherwise.
1587  */
1588 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1589 {
1590         struct drm_device *dev = fb_helper->dev;
1591         int count = 0;
1592         u32 max_width, max_height, bpp_sel;
1593
1594         if (!fb_helper->fb)
1595                 return 0;
1596
1597         mutex_lock(&fb_helper->dev->mode_config.mutex);
1598         if (!drm_fb_helper_is_bound(fb_helper)) {
1599                 fb_helper->delayed_hotplug = true;
1600                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1601                 return 0;
1602         }
1603         DRM_DEBUG_KMS("\n");
1604
1605         max_width = fb_helper->fb->width;
1606         max_height = fb_helper->fb->height;
1607         bpp_sel = fb_helper->fb->bits_per_pixel;
1608
1609         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1610                                                     max_height);
1611         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1612
1613         drm_modeset_lock_all(dev);
1614         drm_setup_crtcs(fb_helper);
1615         drm_modeset_unlock_all(dev);
1616         drm_fb_helper_set_par(fb_helper->fbdev);
1617
1618         return 0;
1619 }
1620 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1621
1622 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1623  * but the module doesn't depend on any fb console symbols.  At least
1624  * attempt to load fbcon to avoid leaving the system without a usable console.
1625  */
1626 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1627 static int __init drm_fb_helper_modinit(void)
1628 {
1629         const char *name = "fbcon";
1630         struct module *fbcon;
1631
1632         mutex_lock(&module_mutex);
1633         fbcon = find_module(name);
1634         mutex_unlock(&module_mutex);
1635
1636         if (!fbcon)
1637                 request_module_nowait(name);
1638         return 0;
1639 }
1640
1641 module_init(drm_fb_helper_modinit);
1642 #endif