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