sys/dev/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
  31 #include <drm/drmP.h>
  32 #include <drm/drm_crtc.h>
  33 #include <drm/drm_fb_helper.h>
  34 #include <drm/drm_crtc_helper.h>
  35
  36 static LINUX_LIST_HEAD(kernel_fb_helper_list);
  37
  38 /**
  39  * DOC: fbdev helpers
  40  *
  41  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  42  * mode setting driver. They can be used mostly independantely from the crtc
  43  * helper functions used by many drivers to implement the kernel mode setting
  44  * interfaces.
  45  *
  46  * Initialization is done as a three-step process with drm_fb_helper_init(),
  47  * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().
  48  * Drivers with fancier requirements than the default beheviour can override the
  49  * second step with their own code.  Teardown is done with drm_fb_helper_fini().
  50  *
  51  * At runtime drivers should restore the fbdev console by calling
  52  * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They
  53  * should also notify the fb helper code from updates to the output
  54  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  55  * integration with the output polling code in drm_crtc_helper.c the modeset
  56  * code proves a ->output_poll_changed callback.
  57  *
  58  * All other functions exported by the fb helper library can be used to
  59  * implement the fbdev driver interface by the driver.
  60  */
  61
  62 /**
  63  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
  64  *                                             emulation helper
  65  * @fb_helper: fbdev initialized with drm_fb_helper_init
  66  *
  67  * This functions adds all the available connectors for use with the given
  68  * fb_helper. This is a separate step to allow drivers to freely assign
  69  * connectors to the fbdev, e.g. if some are reserved for special purposes or
  70  * not adequate to be used for the fbcon.
  71  *
  72  * Since this is part of the initial setup before the fbdev is published, no
  73  * locking is required.
  74  */
  75 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  76 {
  77         struct drm_device *dev = fb_helper->dev;
  78         struct drm_connector *connector;
  79         int i;
  80
  81         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  82                 struct drm_fb_helper_connector *fb_helper_connector;
  83
  84                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  85                 if (!fb_helper_connector)
  86                         goto fail;
  87
  88                 fb_helper_connector->connector = connector;
  89                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  90         }
  91         return 0;
  92 fail:
  93         for (i = 0; i < fb_helper->connector_count; i++) {
  94                 kfree(fb_helper->connector_info[i]);
  95                 fb_helper->connector_info[i] = NULL;
  96         }
  97         fb_helper->connector_count = 0;
  98         return -ENOMEM;
  99 }
 100 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 101
 102 static int
 103 fb_get_options(const char *connector_name, char **option)
 104 {
 105
 106         return (1);
 107 }
 108
 109 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 110 {
 111         struct drm_fb_helper_connector *fb_helper_conn;
 112         int i;
 113
 114         for (i = 0; i < fb_helper->connector_count; i++) {
 115                 struct drm_cmdline_mode *mode;
 116                 struct drm_connector *connector;
 117                 char *option = NULL;
 118
 119                 fb_helper_conn = fb_helper->connector_info[i];
 120                 connector = fb_helper_conn->connector;
 121                 mode = &fb_helper_conn->cmdline_mode;
 122
 123                 /* do something on return - turn off connector maybe */
 124                 if (fb_get_options(drm_get_connector_name(connector), &option))
 125                         continue;
 126
 127                 if (drm_mode_parse_command_line_for_connector(option,
 128                                                               connector,
 129                                                               mode)) {
 130                         if (mode->force) {
 131                                 const char *s;
 132                                 switch (mode->force) {
 133                                 case DRM_FORCE_OFF:
 134                                         s = "OFF";
 135                                         break;
 136                                 case DRM_FORCE_ON_DIGITAL:
 137                                         s = "ON - dig";
 138                                         break;
 139                                 default:
 140                                 case DRM_FORCE_ON:
 141                                         s = "ON";
 142                                         break;
 143                                 }
 144
 145                                 DRM_INFO("forcing %s connector %s\n",
 146                                          drm_get_connector_name(connector), s);
 147                                 connector->force = mode->force;
 148                         }
 149
 150                         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 151                                       drm_get_connector_name(connector),
 152                                       mode->xres, mode->yres,
 153                                       mode->refresh_specified ? mode->refresh : 60,
 154                                       mode->rb ? " reduced blanking" : "",
 155                                       mode->margins ? " with margins" : "",
 156                                       mode->interlace ?  " interlaced" : "");
 157                 }
 158
 159         }
 160         return 0;
 161 }
 162
 163 #if 0
 164 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 165 {
 166         uint16_t *r_base, *g_base, *b_base;
 167         int i;
 168
 169         if (helper->funcs->gamma_get == NULL)
 170                 return;
 171
 172         r_base = crtc->gamma_store;
 173         g_base = r_base + crtc->gamma_size;
 174         b_base = g_base + crtc->gamma_size;
 175
 176         for (i = 0; i < crtc->gamma_size; i++)
 177                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 178 }
 179
 180 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 181 {
 182         uint16_t *r_base, *g_base, *b_base;
 183
 184         if (crtc->funcs->gamma_set == NULL)
 185                 return;
 186
 187         r_base = crtc->gamma_store;
 188         g_base = r_base + crtc->gamma_size;
 189         b_base = g_base + crtc->gamma_size;
 190
 191         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 192 }
 193
 194 /**
 195  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 196  * @info: fbdev registered by the helper
 197  */
 198 int drm_fb_helper_debug_enter(struct fb_info *info)
 199 {
 200         struct drm_fb_helper *helper = info->par;
 201         struct drm_crtc_helper_funcs *funcs;
 202         int i;
 203
 204         if (list_empty(&kernel_fb_helper_list))
 205                 return false;
 206
 207         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 208                 for (i = 0; i < helper->crtc_count; i++) {
 209                         struct drm_mode_set *mode_set =
 210                                 &helper->crtc_info[i].mode_set;
 211
 212                         if (!mode_set->crtc->enabled)
 213                                 continue;
 214
 215                         funcs = mode_set->crtc->helper_private;
 216                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 217                         funcs->mode_set_base_atomic(mode_set->crtc,
 218                                                     mode_set->fb,
 219                                                     mode_set->x,
 220                                                     mode_set->y,
 221                                                     ENTER_ATOMIC_MODE_SET);
 222                 }
 223         }
 224
 225         return 0;
 226 }
 227 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 228
 229 /* Find the real fb for a given fb helper CRTC */
 230 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 231 {
 232         struct drm_device *dev = crtc->dev;
 233         struct drm_crtc *c;
 234
 235         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 236                 if (crtc->base.id == c->base.id)
 237                         return c->fb;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 /**
 244  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 245  * @info: fbdev registered by the helper
 246  */
 247 int drm_fb_helper_debug_leave(struct fb_info *info)
 248 {
 249         struct drm_fb_helper *helper = info->par;
 250         struct drm_crtc *crtc;
 251         struct drm_crtc_helper_funcs *funcs;
 252         struct drm_framebuffer *fb;
 253         int i;
 254
 255         for (i = 0; i < helper->crtc_count; i++) {
 256                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 257                 crtc = mode_set->crtc;
 258                 funcs = crtc->helper_private;
 259                 fb = drm_mode_config_fb(crtc);
 260
 261                 if (!crtc->enabled)
 262                         continue;
 263
 264                 if (!fb) {
 265                         DRM_ERROR("no fb to restore??\n");
 266                         continue;
 267                 }
 268
 269                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 270                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 271                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 272         }
 273
 274         return 0;
 275 }
 276 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 277 #endif
 278
 279 /**
 280  * drm_fb_helper_restore_fbdev_mode - restore fbdev configuration
 281  * @fb_helper: fbcon to restore
 282  *
 283  * This should be called from driver's drm ->lastclose callback
 284  * when implementing an fbcon on top of kms using this helper. This ensures that
 285  * the user isn't greeted with a black screen when e.g. X dies.
 286  */
 287 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 288 {
 289         struct drm_device *dev = fb_helper->dev;
 290         struct drm_plane *plane;
 291         bool error = false;
 292         int i;
 293
 294         drm_warn_on_modeset_not_all_locked(dev);
 295
 296         list_for_each_entry(plane, &dev->mode_config.plane_list, head)
 297                 drm_plane_force_disable(plane);
 298
 299         for (i = 0; i < fb_helper->crtc_count; i++) {
 300                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 301                 struct drm_crtc *crtc = mode_set->crtc;
 302                 int ret;
 303
 304                 if (crtc->funcs->cursor_set) {
 305                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 306                         if (ret)
 307                                 error = true;
 308                 }
 309
 310                 ret = drm_mode_set_config_internal(mode_set);
 311                 if (ret)
 312                         error = true;
 313         }
 314         return error;
 315 }
 316 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 317
 318 #if 0
 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 #endif
 360
 361 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 362 {
 363         struct drm_device *dev = fb_helper->dev;
 364         struct drm_crtc *crtc;
 365         int bound = 0, crtcs_bound = 0;
 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         return true;
 377 }
 378
 379 #if 0
 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 #endif
 479
 480 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 481 {
 482         int i;
 483
 484         for (i = 0; i < helper->connector_count; i++)
 485                 kfree(helper->connector_info[i]);
 486         kfree(helper->connector_info);
 487         for (i = 0; i < helper->crtc_count; i++) {
 488                 kfree(helper->crtc_info[i].mode_set.connectors);
 489                 if (helper->crtc_info[i].mode_set.mode)
 490                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 491         }
 492         kfree(helper->crtc_info);
 493 }
 494
 495 /**
 496  * drm_fb_helper_init - initialize a drm_fb_helper structure
 497  * @dev: drm device
 498  * @fb_helper: driver-allocated fbdev helper structure to initialize
 499  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 500  * @max_conn_count: max connector count
 501  *
 502  * This allocates the structures for the fbdev helper with the given limits.
 503  * Note that this won't yet touch the hardware (through the driver interfaces)
 504  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 505  * to allow driver writes more control over the exact init sequence.
 506  *
 507  * Drivers must set fb_helper->funcs before calling
 508  * drm_fb_helper_initial_config().
 509  *
 510  * RETURNS:
 511  * Zero if everything went ok, nonzero otherwise.
 512  */
 513 int drm_fb_helper_init(struct drm_device *dev,
 514                        struct drm_fb_helper *fb_helper,
 515                        int crtc_count, int max_conn_count)
 516 {
 517         struct drm_crtc *crtc;
 518         int i;
 519
 520         fb_helper->dev = dev;
 521
 522         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 523
 524         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 525         if (!fb_helper->crtc_info)
 526                 return -ENOMEM;
 527
 528         fb_helper->crtc_count = crtc_count;
 529         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 530         if (!fb_helper->connector_info) {
 531                 kfree(fb_helper->crtc_info);
 532                 return -ENOMEM;
 533         }
 534         fb_helper->connector_count = 0;
 535
 536         for (i = 0; i < crtc_count; i++) {
 537                 fb_helper->crtc_info[i].mode_set.connectors =
 538                         kcalloc(max_conn_count,
 539                                 sizeof(struct drm_connector *),
 540                                 GFP_KERNEL);
 541
 542                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 543                         goto out_free;
 544                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 545         }
 546
 547         i = 0;
 548         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 549                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 550                 i++;
 551         }
 552
 553         return 0;
 554 out_free:
 555         drm_fb_helper_crtc_free(fb_helper);
 556         return -ENOMEM;
 557 }
 558 EXPORT_SYMBOL(drm_fb_helper_init);
 559
 560 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 561 {
 562         if (!list_empty(&fb_helper->kernel_fb_list)) {
 563                 list_del(&fb_helper->kernel_fb_list);
 564                 if (list_empty(&kernel_fb_helper_list)) {
 565 #if 0
 566                         pr_info("drm: unregistered panic notifier\n");
 567                         atomic_notifier_chain_unregister(&panic_notifier_list,
 568                                                          &paniced);
 569                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 570 #endif
 571                 }
 572         }
 573
 574         drm_fb_helper_crtc_free(fb_helper);
 575
 576 }
 577 EXPORT_SYMBOL(drm_fb_helper_fini);
 578
 579 #if 0
 580 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 581                      u16 blue, u16 regno, struct fb_info *info)
 582 {
 583         struct drm_fb_helper *fb_helper = info->par;
 584         struct drm_framebuffer *fb = fb_helper->fb;
 585         int pindex;
 586
 587         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 588                 u32 *palette;
 589                 u32 value;
 590                 /* place color in psuedopalette */
 591                 if (regno > 16)
 592                         return -EINVAL;
 593                 palette = (u32 *)info->pseudo_palette;
 594                 red >>= (16 - info->var.red.length);
 595                 green >>= (16 - info->var.green.length);
 596                 blue >>= (16 - info->var.blue.length);
 597                 value = (red << info->var.red.offset) |
 598                         (green << info->var.green.offset) |
 599                         (blue << info->var.blue.offset);
 600                 if (info->var.transp.length > 0) {
 601                         u32 mask = (1 << info->var.transp.length) - 1;
 602                         mask <<= info->var.transp.offset;
 603                         value |= mask;
 604                 }
 605                 palette[regno] = value;
 606                 return 0;
 607         }
 608
 609         /*
 610          * The driver really shouldn't advertise pseudo/directcolor
 611          * visuals if it can't deal with the palette.
 612          */
 613         if (WARN_ON(!fb_helper->funcs->gamma_set ||
 614                     !fb_helper->funcs->gamma_get))
 615                 return -EINVAL;
 616
 617         pindex = regno;
 618
 619         if (fb->bits_per_pixel == 16) {
 620                 pindex = regno << 3;
 621
 622                 if (fb->depth == 16 && regno > 63)
 623                         return -EINVAL;
 624                 if (fb->depth == 15 && regno > 31)
 625                         return -EINVAL;
 626
 627                 if (fb->depth == 16) {
 628                         u16 r, g, b;
 629                         int i;
 630                         if (regno < 32) {
 631                                 for (i = 0; i < 8; i++)
 632                                         fb_helper->funcs->gamma_set(crtc, red,
 633                                                 green, blue, pindex + i);
 634                         }
 635
 636                         fb_helper->funcs->gamma_get(crtc, &r,
 637                                                     &g, &b,
 638                                                     pindex >> 1);
 639
 640                         for (i = 0; i < 4; i++)
 641                                 fb_helper->funcs->gamma_set(crtc, r,
 642                                                             green, b,
 643                                                             (pindex >> 1) + i);
 644                 }
 645         }
 646
 647         if (fb->depth != 16)
 648                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 649         return 0;
 650 }
 651
 652 /**
 653  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
 654  * @cmap: cmap to set
 655  * @info: fbdev registered by the helper
 656  */
 657 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 658 {
 659         struct drm_fb_helper *fb_helper = info->par;
 660         struct drm_device *dev = fb_helper->dev;
 661         struct drm_crtc_helper_funcs *crtc_funcs;
 662         u16 *red, *green, *blue, *transp;
 663         struct drm_crtc *crtc;
 664         int i, j, rc = 0;
 665         int start;
 666
 667         drm_modeset_lock_all(dev);
 668         if (!drm_fb_helper_is_bound(fb_helper)) {
 669                 drm_modeset_unlock_all(dev);
 670                 return -EBUSY;
 671         }
 672
 673         for (i = 0; i < fb_helper->crtc_count; i++) {
 674                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 675                 crtc_funcs = crtc->helper_private;
 676
 677                 red = cmap->red;
 678                 green = cmap->green;
 679                 blue = cmap->blue;
 680                 transp = cmap->transp;
 681                 start = cmap->start;
 682
 683                 for (j = 0; j < cmap->len; j++) {
 684                         u16 hred, hgreen, hblue, htransp = 0xffff;
 685
 686                         hred = *red++;
 687                         hgreen = *green++;
 688                         hblue = *blue++;
 689
 690                         if (transp)
 691                                 htransp = *transp++;
 692
 693                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 694                         if (rc)
 695                                 goto out;
 696                 }
 697                 if (crtc_funcs->load_lut)
 698                         crtc_funcs->load_lut(crtc);
 699         }
 700  out:
 701         drm_modeset_unlock_all(dev);
 702         return rc;
 703 }
 704 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 705
 706 /**
 707  * drm_fb_helper_check_var - implementation for ->fb_check_var
 708  * @var: screeninfo to check
 709  * @info: fbdev registered by the helper
 710  */
 711 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 712                             struct fb_info *info)
 713 {
 714         struct drm_fb_helper *fb_helper = info->par;
 715         struct drm_framebuffer *fb = fb_helper->fb;
 716         int depth;
 717
 718         if (var->pixclock != 0 || in_dbg_master())
 719                 return -EINVAL;
 720
 721         /* Need to resize the fb object !!! */
 722         if (var->bits_per_pixel > fb->bits_per_pixel ||
 723             var->xres > fb->width || var->yres > fb->height ||
 724             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
 725                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 726                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
 727                           var->xres, var->yres, var->bits_per_pixel,
 728                           var->xres_virtual, var->yres_virtual,
 729                           fb->width, fb->height, fb->bits_per_pixel);
 730                 return -EINVAL;
 731         }
 732
 733         switch (var->bits_per_pixel) {
 734         case 16:
 735                 depth = (var->green.length == 6) ? 16 : 15;
 736                 break;
 737         case 32:
 738                 depth = (var->transp.length > 0) ? 32 : 24;
 739                 break;
 740         default:
 741                 depth = var->bits_per_pixel;
 742                 break;
 743         }
 744
 745         switch (depth) {
 746         case 8:
 747                 var->red.offset = 0;
 748                 var->green.offset = 0;
 749                 var->blue.offset = 0;
 750                 var->red.length = 8;
 751                 var->green.length = 8;
 752                 var->blue.length = 8;
 753                 var->transp.length = 0;
 754                 var->transp.offset = 0;
 755                 break;
 756         case 15:
 757                 var->red.offset = 10;
 758                 var->green.offset = 5;
 759                 var->blue.offset = 0;
 760                 var->red.length = 5;
 761                 var->green.length = 5;
 762                 var->blue.length = 5;
 763                 var->transp.length = 1;
 764                 var->transp.offset = 15;
 765                 break;
 766         case 16:
 767                 var->red.offset = 11;
 768                 var->green.offset = 5;
 769                 var->blue.offset = 0;
 770                 var->red.length = 5;
 771                 var->green.length = 6;
 772                 var->blue.length = 5;
 773                 var->transp.length = 0;
 774                 var->transp.offset = 0;
 775                 break;
 776         case 24:
 777                 var->red.offset = 16;
 778                 var->green.offset = 8;
 779                 var->blue.offset = 0;
 780                 var->red.length = 8;
 781                 var->green.length = 8;
 782                 var->blue.length = 8;
 783                 var->transp.length = 0;
 784                 var->transp.offset = 0;
 785                 break;
 786         case 32:
 787                 var->red.offset = 16;
 788                 var->green.offset = 8;
 789                 var->blue.offset = 0;
 790                 var->red.length = 8;
 791                 var->green.length = 8;
 792                 var->blue.length = 8;
 793                 var->transp.length = 8;
 794                 var->transp.offset = 24;
 795                 break;
 796         default:
 797                 return -EINVAL;
 798         }
 799         return 0;
 800 }
 801 EXPORT_SYMBOL(drm_fb_helper_check_var);
 802
 803 /**
 804  * drm_fb_helper_set_par - implementation for ->fb_set_par
 805  * @info: fbdev registered by the helper
 806  *
 807  * This will let fbcon do the mode init and is called at initialization time by
 808  * the fbdev core when registering the driver, and later on through the hotplug
 809  * callback.
 810  */
 811 int drm_fb_helper_set_par(struct fb_info *info)
 812 {
 813         struct drm_fb_helper *fb_helper = info->par;
 814         struct drm_device *dev = fb_helper->dev;
 815         struct fb_var_screeninfo *var = &info->var;
 816         int ret;
 817         int i;
 818
 819         if (var->pixclock != 0) {
 820                 DRM_ERROR("PIXEL CLOCK SET\n");
 821                 return -EINVAL;
 822         }
 823
 824         drm_modeset_lock_all(dev);
 825         for (i = 0; i < fb_helper->crtc_count; i++) {
 826                 ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);
 827                 if (ret) {
 828                         drm_modeset_unlock_all(dev);
 829                         return ret;
 830                 }
 831         }
 832         drm_modeset_unlock_all(dev);
 833
 834         if (fb_helper->delayed_hotplug) {
 835                 fb_helper->delayed_hotplug = false;
 836                 drm_fb_helper_hotplug_event(fb_helper);
 837         }
 838         return 0;
 839 }
 840 EXPORT_SYMBOL(drm_fb_helper_set_par);
 841
 842 /**
 843  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
 844  * @var: updated screen information
 845  * @info: fbdev registered by the helper
 846  */
 847 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 848                               struct fb_info *info)
 849 {
 850         struct drm_fb_helper *fb_helper = info->par;
 851         struct drm_device *dev = fb_helper->dev;
 852         struct drm_mode_set *modeset;
 853         int ret = 0;
 854         int i;
 855
 856         drm_modeset_lock_all(dev);
 857         if (!drm_fb_helper_is_bound(fb_helper)) {
 858                 drm_modeset_unlock_all(dev);
 859                 return -EBUSY;
 860         }
 861
 862         for (i = 0; i < fb_helper->crtc_count; i++) {
 863                 modeset = &fb_helper->crtc_info[i].mode_set;
 864
 865                 modeset->x = var->xoffset;
 866                 modeset->y = var->yoffset;
 867
 868                 if (modeset->num_connectors) {
 869                         ret = drm_mode_set_config_internal(modeset);
 870                         if (!ret) {
 871                                 info->var.xoffset = var->xoffset;
 872                                 info->var.yoffset = var->yoffset;
 873                         }
 874                 }
 875         }
 876         drm_modeset_unlock_all(dev);
 877         return ret;
 878 }
 879 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 880 #endif
 881
 882 /*
 883  * Allocates the backing storage and sets up the fbdev info structure through
 884  * the ->fb_probe callback and then registers the fbdev and sets up the panic
 885  * notifier.
 886  */
 887 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 888                                          int preferred_bpp)
 889 {
 890         int ret = 0;
 891         int crtc_count = 0;
 892         int i;
 893         struct fb_info *info;
 894         struct drm_fb_helper_surface_size sizes;
 895         int gamma_size = 0;
 896
 897         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 898         sizes.surface_depth = 24;
 899         sizes.surface_bpp = 32;
 900         sizes.fb_width = (unsigned)-1;
 901         sizes.fb_height = (unsigned)-1;
 902
 903         /* if driver picks 8 or 16 by default use that
 904            for both depth/bpp */
 905         if (preferred_bpp != sizes.surface_bpp)
 906                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 907
 908         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 909         for (i = 0; i < fb_helper->connector_count; i++) {
 910                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 911                 struct drm_cmdline_mode *cmdline_mode;
 912
 913                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 914
 915                 if (cmdline_mode->bpp_specified) {
 916                         switch (cmdline_mode->bpp) {
 917                         case 8:
 918                                 sizes.surface_depth = sizes.surface_bpp = 8;
 919                                 break;
 920                         case 15:
 921                                 sizes.surface_depth = 15;
 922                                 sizes.surface_bpp = 16;
 923                                 break;
 924                         case 16:
 925                                 sizes.surface_depth = sizes.surface_bpp = 16;
 926                                 break;
 927                         case 24:
 928                                 sizes.surface_depth = sizes.surface_bpp = 24;
 929                                 break;
 930                         case 32:
 931                                 sizes.surface_depth = 24;
 932                                 sizes.surface_bpp = 32;
 933                                 break;
 934                         }
 935                         break;
 936                 }
 937         }
 938
 939         crtc_count = 0;
 940         for (i = 0; i < fb_helper->crtc_count; i++) {
 941                 struct drm_display_mode *desired_mode;
 942                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 943
 944                 if (desired_mode) {
 945                         if (gamma_size == 0)
 946                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 947                         if (desired_mode->hdisplay < sizes.fb_width)
 948                                 sizes.fb_width = desired_mode->hdisplay;
 949                         if (desired_mode->vdisplay < sizes.fb_height)
 950                                 sizes.fb_height = desired_mode->vdisplay;
 951                         if (desired_mode->hdisplay > sizes.surface_width)
 952                                 sizes.surface_width = desired_mode->hdisplay;
 953                         if (desired_mode->vdisplay > sizes.surface_height)
 954                                 sizes.surface_height = desired_mode->vdisplay;
 955                         crtc_count++;
 956                 }
 957         }
 958
 959         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 960                 /* hmm everyone went away - assume VGA cable just fell out
 961                    and will come back later. */
 962                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 963                 sizes.fb_width = sizes.surface_width = 1024;
 964                 sizes.fb_height = sizes.surface_height = 768;
 965         }
 966
 967         /* push down into drivers */
 968         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 969         if (ret < 0)
 970                 return ret;
 971
 972         info = fb_helper->fbdev;
 973
 974         /*
 975          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
 976          * events, but at init time drm_setup_crtcs needs to be called before
 977          * the fb is allocated (since we need to figure out the desired size of
 978          * the fb before we can allocate it ...). Hence we need to fix things up
 979          * here again.
 980          */
 981         for (i = 0; i < fb_helper->crtc_count; i++)
 982                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
 983                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 984
 985
 986 #if 0
 987         info->var.pixclock = 0;
 988         if (register_framebuffer(info) < 0)
 989                 return -EINVAL;
 990
 991         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
 992                         info->node, info->fix.id);
 993
 994         /* Switch back to kernel console on panic */
 995         /* multi card linked list maybe */
 996         if (list_empty(&kernel_fb_helper_list)) {
 997                 dev_info(fb_helper->dev->dev, "registered panic notifier\n");
 998                 atomic_notifier_chain_register(&panic_notifier_list,
 999                                                &paniced);
1000                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1001         }
1002
1003         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1004 #endif
1005
1006         return 0;
1007 }
1008
1009 #if 0
1010 /**
1011  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1012  * @info: fbdev registered by the helper
1013  * @pitch: desired pitch
1014  * @depth: desired depth
1015  *
1016  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1017  * fbdev emulations. Drivers which support acceleration methods which impose
1018  * additional constraints need to set up their own limits.
1019  *
1020  * Drivers should call this (or their equivalent setup code) from their
1021  * ->fb_probe callback.
1022  */
1023 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1024                             uint32_t depth)
1025 {
1026         info->fix.type = FB_TYPE_PACKED_PIXELS;
1027         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1028                 FB_VISUAL_TRUECOLOR;
1029         info->fix.mmio_start = 0;
1030         info->fix.mmio_len = 0;
1031         info->fix.type_aux = 0;
1032         info->fix.xpanstep = 1; /* doing it in hw */
1033         info->fix.ypanstep = 1; /* doing it in hw */
1034         info->fix.ywrapstep = 0;
1035         info->fix.accel = FB_ACCEL_NONE;
1036         info->fix.type_aux = 0;
1037
1038         info->fix.line_length = pitch;
1039         return;
1040 }
1041 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1042
1043 /**
1044  * drm_fb_helper_fill_var - initalizes variable fbdev information
1045  * @info: fbdev instance to set up
1046  * @fb_helper: fb helper instance to use as template
1047  * @fb_width: desired fb width
1048  * @fb_height: desired fb height
1049  *
1050  * Sets up the variable fbdev metainformation from the given fb helper instance
1051  * and the drm framebuffer allocated in fb_helper->fb.
1052  *
1053  * Drivers should call this (or their equivalent setup code) from their
1054  * ->fb_probe callback after having allocated the fbdev backing
1055  * storage framebuffer.
1056  */
1057 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1058                             uint32_t fb_width, uint32_t fb_height)
1059 {
1060         struct drm_framebuffer *fb = fb_helper->fb;
1061         info->pseudo_palette = fb_helper->pseudo_palette;
1062         info->var.xres_virtual = fb->width;
1063         info->var.yres_virtual = fb->height;
1064         info->var.bits_per_pixel = fb->bits_per_pixel;
1065         info->var.accel_flags = FB_ACCELF_TEXT;
1066         info->var.xoffset = 0;
1067         info->var.yoffset = 0;
1068         info->var.activate = FB_ACTIVATE_NOW;
1069         info->var.height = -1;
1070         info->var.width = -1;
1071
1072         switch (fb->depth) {
1073         case 8:
1074                 info->var.red.offset = 0;
1075                 info->var.green.offset = 0;
1076                 info->var.blue.offset = 0;
1077                 info->var.red.length = 8; /* 8bit DAC */
1078                 info->var.green.length = 8;
1079                 info->var.blue.length = 8;
1080                 info->var.transp.offset = 0;
1081                 info->var.transp.length = 0;
1082                 break;
1083         case 15:
1084                 info->var.red.offset = 10;
1085                 info->var.green.offset = 5;
1086                 info->var.blue.offset = 0;
1087                 info->var.red.length = 5;
1088                 info->var.green.length = 5;
1089                 info->var.blue.length = 5;
1090                 info->var.transp.offset = 15;
1091                 info->var.transp.length = 1;
1092                 break;
1093         case 16:
1094                 info->var.red.offset = 11;
1095                 info->var.green.offset = 5;
1096                 info->var.blue.offset = 0;
1097                 info->var.red.length = 5;
1098                 info->var.green.length = 6;
1099                 info->var.blue.length = 5;
1100                 info->var.transp.offset = 0;
1101                 break;
1102         case 24:
1103                 info->var.red.offset = 16;
1104                 info->var.green.offset = 8;
1105                 info->var.blue.offset = 0;
1106                 info->var.red.length = 8;
1107                 info->var.green.length = 8;
1108                 info->var.blue.length = 8;
1109                 info->var.transp.offset = 0;
1110                 info->var.transp.length = 0;
1111                 break;
1112         case 32:
1113                 info->var.red.offset = 16;
1114                 info->var.green.offset = 8;
1115                 info->var.blue.offset = 0;
1116                 info->var.red.length = 8;
1117                 info->var.green.length = 8;
1118                 info->var.blue.length = 8;
1119                 info->var.transp.offset = 24;
1120                 info->var.transp.length = 8;
1121                 break;
1122         default:
1123                 break;
1124         }
1125
1126         info->var.xres = fb_width;
1127         info->var.yres = fb_height;
1128 }
1129 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1130 #endif
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         int my_score, best_score, score;
1364         struct drm_fb_helper_crtc **crtcs, *crtc;
1365         struct drm_fb_helper_connector *fb_helper_conn;
1366
1367         if (n == fb_helper->connector_count)
1368                 return 0;
1369
1370         fb_helper_conn = fb_helper->connector_info[n];
1371         connector = fb_helper_conn->connector;
1372
1373         best_crtcs[n] = NULL;
1374         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1375         if (modes[n] == NULL)
1376                 return best_score;
1377
1378         crtcs = kzalloc(dev->mode_config.num_connector *
1379                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1380         if (!crtcs)
1381                 return best_score;
1382
1383         my_score = 1;
1384         if (connector->status == connector_status_connected)
1385                 my_score++;
1386         if (drm_has_cmdline_mode(fb_helper_conn))
1387                 my_score++;
1388         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1389                 my_score++;
1390
1391         connector_funcs = connector->helper_private;
1392         encoder = connector_funcs->best_encoder(connector);
1393         if (!encoder)
1394                 goto out;
1395
1396         /* select a crtc for this connector and then attempt to configure
1397            remaining connectors */
1398         for (c = 0; c < fb_helper->crtc_count; c++) {
1399                 crtc = &fb_helper->crtc_info[c];
1400
1401                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1402                         continue;
1403
1404                 for (o = 0; o < n; o++)
1405                         if (best_crtcs[o] == crtc)
1406                                 break;
1407
1408                 if (o < n) {
1409                         /* ignore cloning unless only a single crtc */
1410                         if (fb_helper->crtc_count > 1)
1411                                 continue;
1412
1413                         if (!drm_mode_equal(modes[o], modes[n]))
1414                                 continue;
1415                 }
1416
1417                 crtcs[n] = crtc;
1418                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1419                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1420                                                   width, height);
1421                 if (score > best_score) {
1422                         best_score = score;
1423                         memcpy(best_crtcs, crtcs,
1424                                dev->mode_config.num_connector *
1425                                sizeof(struct drm_fb_helper_crtc *));
1426                 }
1427         }
1428 out:
1429         kfree(crtcs);
1430         return best_score;
1431 }
1432
1433 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1434 {
1435         struct drm_device *dev = fb_helper->dev;
1436         struct drm_fb_helper_crtc **crtcs;
1437         struct drm_display_mode **modes;
1438         struct drm_mode_set *modeset;
1439         bool *enabled;
1440         int width, height;
1441         int i;
1442
1443         DRM_DEBUG_KMS("\n");
1444
1445         width = dev->mode_config.max_width;
1446         height = dev->mode_config.max_height;
1447
1448         crtcs = kcalloc(dev->mode_config.num_connector,
1449                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1450         modes = kcalloc(dev->mode_config.num_connector,
1451                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1452         enabled = kcalloc(dev->mode_config.num_connector,
1453                           sizeof(bool), GFP_KERNEL);
1454         if (!crtcs || !modes || !enabled) {
1455                 DRM_ERROR("Memory allocation failed\n");
1456                 goto out;
1457         }
1458
1459
1460         drm_enable_connectors(fb_helper, enabled);
1461
1462         if (!(fb_helper->funcs->initial_config &&
1463               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
1464                                                enabled, width, height))) {
1465                 memset(modes, 0, dev->mode_config.num_connector*sizeof(modes[0]));
1466                 memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0]));
1467
1468                 if (!drm_target_cloned(fb_helper,
1469                                        modes, enabled, width, height) &&
1470                     !drm_target_preferred(fb_helper,
1471                                           modes, enabled, width, height))
1472                         DRM_ERROR("Unable to find initial modes\n");
1473
1474                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
1475                               width, height);
1476
1477                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1478         }
1479
1480         /* need to set the modesets up here for use later */
1481         /* fill out the connector<->crtc mappings into the modesets */
1482         for (i = 0; i < fb_helper->crtc_count; i++) {
1483                 modeset = &fb_helper->crtc_info[i].mode_set;
1484                 modeset->num_connectors = 0;
1485                 modeset->fb = NULL;
1486         }
1487
1488         for (i = 0; i < fb_helper->connector_count; i++) {
1489                 struct drm_display_mode *mode = modes[i];
1490                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1491                 modeset = &fb_crtc->mode_set;
1492
1493                 if (mode && fb_crtc) {
1494                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1495                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1496                         fb_crtc->desired_mode = mode;
1497                         if (modeset->mode)
1498                                 drm_mode_destroy(dev, modeset->mode);
1499                         modeset->mode = drm_mode_duplicate(dev,
1500                                                            fb_crtc->desired_mode);
1501                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1502                         modeset->fb = fb_helper->fb;
1503                 }
1504         }
1505
1506         /* Clear out any old modes if there are no more connected outputs. */
1507         for (i = 0; i < fb_helper->crtc_count; i++) {
1508                 modeset = &fb_helper->crtc_info[i].mode_set;
1509                 if (modeset->num_connectors == 0) {
1510                         BUG_ON(modeset->fb);
1511                         BUG_ON(modeset->num_connectors);
1512                         if (modeset->mode)
1513                                 drm_mode_destroy(dev, modeset->mode);
1514                         modeset->mode = NULL;
1515                 }
1516         }
1517 out:
1518         kfree(crtcs);
1519         kfree(modes);
1520         kfree(enabled);
1521 }
1522
1523 /**
1524  * drm_fb_helper_initial_config - setup a sane initial connector configuration
1525  * @fb_helper: fb_helper device struct
1526  * @bpp_sel: bpp value to use for the framebuffer configuration
1527  *
1528  * Scans the CRTCs and connectors and tries to put together an initial setup.
1529  * At the moment, this is a cloned configuration across all heads with
1530  * a new framebuffer object as the backing store.
1531  *
1532  * Note that this also registers the fbdev and so allows userspace to call into
1533  * the driver through the fbdev interfaces.
1534  *
1535  * This function will call down into the ->fb_probe callback to let
1536  * the driver allocate and initialize the fbdev info structure and the drm
1537  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
1538  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
1539  * values for the fbdev info structure.
1540  *
1541  * RETURNS:
1542  * Zero if everything went ok, nonzero otherwise.
1543  */
1544 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1545 {
1546         struct drm_device *dev = fb_helper->dev;
1547         int count = 0;
1548
1549         drm_fb_helper_parse_command_line(fb_helper);
1550
1551         count = drm_fb_helper_probe_connector_modes(fb_helper,
1552                                                     dev->mode_config.max_width,
1553                                                     dev->mode_config.max_height);
1554         /*
1555          * we shouldn't end up with no modes here.
1556          */
1557         if (count == 0)
1558                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
1559
1560         drm_setup_crtcs(fb_helper);
1561
1562         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1563 }
1564 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1565
1566 /**
1567  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
1568  *                               probing all the outputs attached to the fb
1569  * @fb_helper: the drm_fb_helper
1570  *
1571  * Scan the connectors attached to the fb_helper and try to put together a
1572  * setup after *notification of a change in output configuration.
1573  *
1574  * Called at runtime, takes the mode config locks to be able to check/change the
1575  * modeset configuration. Must be run from process context (which usually means
1576  * either the output polling work or a work item launched from the driver's
1577  * hotplug interrupt).
1578  *
1579  * Note that the driver must ensure that this is only called _after_ the fb has
1580  * been fully set up, i.e. after the call to drm_fb_helper_initial_config.
1581  *
1582  * RETURNS:
1583  * 0 on success and a non-zero error code otherwise.
1584  */
1585 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1586 {
1587         struct drm_device *dev = fb_helper->dev;
1588         u32 max_width, max_height;
1589
1590         if (!fb_helper->fb)
1591                 return 0;
1592
1593         mutex_lock(&fb_helper->dev->mode_config.mutex);
1594         if (!drm_fb_helper_is_bound(fb_helper)) {
1595                 fb_helper->delayed_hotplug = true;
1596                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
1597                 return 0;
1598         }
1599         DRM_DEBUG_KMS("\n");
1600
1601         max_width = fb_helper->fb->width;
1602         max_height = fb_helper->fb->height;
1603
1604         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
1605         mutex_unlock(&fb_helper->dev->mode_config.mutex);
1606
1607         drm_modeset_lock_all(dev);
1608         drm_setup_crtcs(fb_helper);
1609         drm_modeset_unlock_all(dev);
1610 #if 0
1611         drm_fb_helper_set_par(fb_helper->fbdev);
1612 #endif
1613
1614         return 0;
1615 }
1616 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1617
1618 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1619  * but the module doesn't depend on any fb console symbols.  At least
1620  * attempt to load fbcon to avoid leaving the system without a usable console.
1621  */
1622 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1623 static int __init drm_fb_helper_modinit(void)
1624 {
1625         const char *name = "fbcon";
1626         struct module *fbcon;
1627
1628         mutex_lock(&module_mutex);
1629         fbcon = find_module(name);
1630         mutex_unlock(&module_mutex);
1631
1632         if (!fbcon)
1633                 request_module_nowait(name);
1634         return 0;
1635 }
1636
1637 module_init(drm_fb_helper_modinit);
1638 #endif