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