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 #include <linux/kernel.h>
  31 #include <linux/sysrq.h>
  32 #include <linux/slab.h>
  33 #include <linux/fb.h>
  34 #include "drmP.h"
  35 #include "drm_crtc.h"
  36 #include "drm_fb_helper.h"
  37 #include "drm_crtc_helper.h"
  38
  39 MODULE_AUTHOR("David Airlie, Jesse Barnes");
  40 MODULE_DESCRIPTION("DRM KMS helper");
  41 MODULE_LICENSE("GPL and additional rights");
  42
  43 static LIST_HEAD(kernel_fb_helper_list);
  44
  45 /* simple single crtc case helper function */
  46 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
  47 {
  48         struct drm_device *dev = fb_helper->dev;
  49         struct drm_connector *connector;
  50         int i;
  51
  52         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  53                 struct drm_fb_helper_connector *fb_helper_connector;
  54
  55                 fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
  56                 if (!fb_helper_connector)
  57                         goto fail;
  58
  59                 fb_helper_connector->connector = connector;
  60                 fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
  61         }
  62         return 0;
  63 fail:
  64         for (i = 0; i < fb_helper->connector_count; i++) {
  65                 kfree(fb_helper->connector_info[i]);
  66                 fb_helper->connector_info[i] = NULL;
  67         }
  68         fb_helper->connector_count = 0;
  69         return -ENOMEM;
  70 }
  71 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
  72
  73 /**
  74  * drm_fb_helper_connector_parse_command_line - parse command line for connector
  75  * @connector - connector to parse line for
  76  * @mode_option - per connector mode option
  77  *
  78  * This parses the connector specific then generic command lines for
  79  * modes and options to configure the connector.
  80  *
  81  * This uses the same parameters as the fb modedb.c, except for extra
  82  *      <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
  83  *
  84  * enable/enable Digital/disable bit at the end
  85  */
  86 static bool drm_fb_helper_connector_parse_command_line(struct drm_fb_helper_connector *fb_helper_conn,
  87                                                        const char *mode_option)
  88 {
  89         const char *name;
  90         unsigned int namelen;
  91         int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
  92         unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
  93         int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
  94         int i;
  95         enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
  96         struct drm_fb_helper_cmdline_mode *cmdline_mode;
  97         struct drm_connector *connector;
  98
  99         if (!fb_helper_conn)
 100                 return false;
 101         connector = fb_helper_conn->connector;
 102
 103         cmdline_mode = &fb_helper_conn->cmdline_mode;
 104         if (!mode_option)
 105                 mode_option = fb_mode_option;
 106
 107         if (!mode_option) {
 108                 cmdline_mode->specified = false;
 109                 return false;
 110         }
 111
 112         name = mode_option;
 113         namelen = strlen(name);
 114         for (i = namelen-1; i >= 0; i--) {
 115                 switch (name[i]) {
 116                 case '@':
 117                         namelen = i;
 118                         if (!refresh_specified && !bpp_specified &&
 119                             !yres_specified) {
 120                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 121                                 refresh_specified = 1;
 122                                 if (cvt || rb)
 123                                         cvt = 0;
 124                         } else
 125                                 goto done;
 126                         break;
 127                 case '-':
 128                         namelen = i;
 129                         if (!bpp_specified && !yres_specified) {
 130                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 131                                 bpp_specified = 1;
 132                                 if (cvt || rb)
 133                                         cvt = 0;
 134                         } else
 135                                 goto done;
 136                         break;
 137                 case 'x':
 138                         if (!yres_specified) {
 139                                 yres = simple_strtol(&name[i+1], NULL, 10);
 140                                 yres_specified = 1;
 141                         } else
 142                                 goto done;
 143                 case '0' ... '9':
 144                         break;
 145                 case 'M':
 146                         if (!yres_specified)
 147                                 cvt = 1;
 148                         break;
 149                 case 'R':
 150                         if (cvt)
 151                                 rb = 1;
 152                         break;
 153                 case 'm':
 154                         if (!cvt)
 155                                 margins = 1;
 156                         break;
 157                 case 'i':
 158                         if (!cvt)
 159                                 interlace = 1;
 160                         break;
 161                 case 'e':
 162                         force = DRM_FORCE_ON;
 163                         break;
 164                 case 'D':
 165                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 166                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 167                                 force = DRM_FORCE_ON;
 168                         else
 169                                 force = DRM_FORCE_ON_DIGITAL;
 170                         break;
 171                 case 'd':
 172                         force = DRM_FORCE_OFF;
 173                         break;
 174                 default:
 175                         goto done;
 176                 }
 177         }
 178         if (i < 0 && yres_specified) {
 179                 xres = simple_strtol(name, NULL, 10);
 180                 res_specified = 1;
 181         }
 182 done:
 183
 184         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 185                 drm_get_connector_name(connector), xres, yres,
 186                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 187                 "", (margins) ? " with margins" : "", (interlace) ?
 188                 " interlaced" : "");
 189
 190         if (force) {
 191                 const char *s;
 192                 switch (force) {
 193                 case DRM_FORCE_OFF: s = "OFF"; break;
 194                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 195                 default:
 196                 case DRM_FORCE_ON: s = "ON"; break;
 197                 }
 198
 199                 DRM_INFO("forcing %s connector %s\n",
 200                          drm_get_connector_name(connector), s);
 201                 connector->force = force;
 202         }
 203
 204         if (res_specified) {
 205                 cmdline_mode->specified = true;
 206                 cmdline_mode->xres = xres;
 207                 cmdline_mode->yres = yres;
 208         }
 209
 210         if (refresh_specified) {
 211                 cmdline_mode->refresh_specified = true;
 212                 cmdline_mode->refresh = refresh;
 213         }
 214
 215         if (bpp_specified) {
 216                 cmdline_mode->bpp_specified = true;
 217                 cmdline_mode->bpp = bpp;
 218         }
 219         cmdline_mode->rb = rb ? true : false;
 220         cmdline_mode->cvt = cvt  ? true : false;
 221         cmdline_mode->interlace = interlace ? true : false;
 222
 223         return true;
 224 }
 225
 226 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 227 {
 228         struct drm_fb_helper_connector *fb_helper_conn;
 229         int i;
 230
 231         for (i = 0; i < fb_helper->connector_count; i++) {
 232                 char *option = NULL;
 233
 234                 fb_helper_conn = fb_helper->connector_info[i];
 235
 236                 /* do something on return - turn off connector maybe */
 237                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 238                         continue;
 239
 240                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 241         }
 242         return 0;
 243 }
 244
 245 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 246 {
 247         uint16_t *r_base, *g_base, *b_base;
 248         int i;
 249
 250         r_base = crtc->gamma_store;
 251         g_base = r_base + crtc->gamma_size;
 252         b_base = g_base + crtc->gamma_size;
 253
 254         for (i = 0; i < crtc->gamma_size; i++)
 255                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 256 }
 257
 258 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 259 {
 260         uint16_t *r_base, *g_base, *b_base;
 261
 262         r_base = crtc->gamma_store;
 263         g_base = r_base + crtc->gamma_size;
 264         b_base = g_base + crtc->gamma_size;
 265
 266         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
 267 }
 268
 269 int drm_fb_helper_debug_enter(struct fb_info *info)
 270 {
 271         struct drm_fb_helper *helper = info->par;
 272         struct drm_crtc_helper_funcs *funcs;
 273         int i;
 274
 275         if (list_empty(&kernel_fb_helper_list))
 276                 return false;
 277
 278         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 279                 for (i = 0; i < helper->crtc_count; i++) {
 280                         struct drm_mode_set *mode_set =
 281                                 &helper->crtc_info[i].mode_set;
 282
 283                         if (!mode_set->crtc->enabled)
 284                                 continue;
 285
 286                         funcs = mode_set->crtc->helper_private;
 287                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 288                         funcs->mode_set_base_atomic(mode_set->crtc,
 289                                                     mode_set->fb,
 290                                                     mode_set->x,
 291                                                     mode_set->y,
 292                                                     ENTER_ATOMIC_MODE_SET);
 293                 }
 294         }
 295
 296         return 0;
 297 }
 298 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 299
 300 /* Find the real fb for a given fb helper CRTC */
 301 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 302 {
 303         struct drm_device *dev = crtc->dev;
 304         struct drm_crtc *c;
 305
 306         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 307                 if (crtc->base.id == c->base.id)
 308                         return c->fb;
 309         }
 310
 311         return NULL;
 312 }
 313
 314 int drm_fb_helper_debug_leave(struct fb_info *info)
 315 {
 316         struct drm_fb_helper *helper = info->par;
 317         struct drm_crtc *crtc;
 318         struct drm_crtc_helper_funcs *funcs;
 319         struct drm_framebuffer *fb;
 320         int i;
 321
 322         for (i = 0; i < helper->crtc_count; i++) {
 323                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 324                 crtc = mode_set->crtc;
 325                 funcs = crtc->helper_private;
 326                 fb = drm_mode_config_fb(crtc);
 327
 328                 if (!crtc->enabled)
 329                         continue;
 330
 331                 if (!fb) {
 332                         DRM_ERROR("no fb to restore??\n");
 333                         continue;
 334                 }
 335
 336                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 337                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 338                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 339         }
 340
 341         return 0;
 342 }
 343 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 344
 345 bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 346 {
 347         bool error = false;
 348         int i, ret;
 349         for (i = 0; i < fb_helper->crtc_count; i++) {
 350                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 351                 ret = drm_crtc_helper_set_config(mode_set);
 352                 if (ret)
 353                         error = true;
 354         }
 355         return error;
 356 }
 357 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
 358
 359 bool drm_fb_helper_force_kernel_mode(void)
 360 {
 361         bool ret, error = false;
 362         struct drm_fb_helper *helper;
 363
 364         if (list_empty(&kernel_fb_helper_list))
 365                 return false;
 366
 367         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 368                 if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 369                         continue;
 370
 371                 ret = drm_fb_helper_restore_fbdev_mode(helper);
 372                 if (ret)
 373                         error = true;
 374         }
 375         return error;
 376 }
 377
 378 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 379                         void *panic_str)
 380 {
 381         printk(KERN_ERR "panic occurred, switching back to text console\n");
 382         return drm_fb_helper_force_kernel_mode();
 383         return 0;
 384 }
 385 EXPORT_SYMBOL(drm_fb_helper_panic);
 386
 387 static struct notifier_block paniced = {
 388         .notifier_call = drm_fb_helper_panic,
 389 };
 390
 391 /**
 392  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 393  *
 394  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 395  */
 396 void drm_fb_helper_restore(void)
 397 {
 398         bool ret;
 399         ret = drm_fb_helper_force_kernel_mode();
 400         if (ret == true)
 401                 DRM_ERROR("Failed to restore crtc configuration\n");
 402 }
 403 EXPORT_SYMBOL(drm_fb_helper_restore);
 404
 405 #ifdef CONFIG_MAGIC_SYSRQ
 406 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 407 {
 408         drm_fb_helper_restore();
 409 }
 410 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 411
 412 static void drm_fb_helper_sysrq(int dummy1)
 413 {
 414         schedule_work(&drm_fb_helper_restore_work);
 415 }
 416
 417 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 418         .handler = drm_fb_helper_sysrq,
 419         .help_msg = "force-fb(V)",
 420         .action_msg = "Restore framebuffer console",
 421 };
 422 #else
 423 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 424 #endif
 425
 426 static void drm_fb_helper_on(struct fb_info *info)
 427 {
 428         struct drm_fb_helper *fb_helper = info->par;
 429         struct drm_device *dev = fb_helper->dev;
 430         struct drm_crtc *crtc;
 431         struct drm_crtc_helper_funcs *crtc_funcs;
 432         struct drm_connector *connector;
 433         struct drm_encoder *encoder;
 434         int i, j;
 435
 436         /*
 437          * For each CRTC in this fb, turn the crtc on then,
 438          * find all associated encoders and turn them on.
 439          */
 440         mutex_lock(&dev->mode_config.mutex);
 441         for (i = 0; i < fb_helper->crtc_count; i++) {
 442                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 443                 crtc_funcs = crtc->helper_private;
 444
 445                 if (!crtc->enabled)
 446                         continue;
 447
 448                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 449
 450                 /* Walk the connectors & encoders on this fb turning them on */
 451                 for (j = 0; j < fb_helper->connector_count; j++) {
 452                         connector = fb_helper->connector_info[j]->connector;
 453                         connector->dpms = DRM_MODE_DPMS_ON;
 454                         drm_connector_property_set_value(connector,
 455                                                          dev->mode_config.dpms_property,
 456                                                          DRM_MODE_DPMS_ON);
 457                 }
 458                 /* Found a CRTC on this fb, now find encoders */
 459                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 460                         if (encoder->crtc == crtc) {
 461                                 struct drm_encoder_helper_funcs *encoder_funcs;
 462
 463                                 encoder_funcs = encoder->helper_private;
 464                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 465                         }
 466                 }
 467         }
 468         mutex_unlock(&dev->mode_config.mutex);
 469 }
 470
 471 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 472 {
 473         struct drm_fb_helper *fb_helper = info->par;
 474         struct drm_device *dev = fb_helper->dev;
 475         struct drm_crtc *crtc;
 476         struct drm_crtc_helper_funcs *crtc_funcs;
 477         struct drm_connector *connector;
 478         struct drm_encoder *encoder;
 479         int i, j;
 480
 481         /*
 482          * For each CRTC in this fb, find all associated encoders
 483          * and turn them off, then turn off the CRTC.
 484          */
 485         mutex_lock(&dev->mode_config.mutex);
 486         for (i = 0; i < fb_helper->crtc_count; i++) {
 487                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 488                 crtc_funcs = crtc->helper_private;
 489
 490                 if (!crtc->enabled)
 491                         continue;
 492
 493                 /* Walk the connectors on this fb and mark them off */
 494                 for (j = 0; j < fb_helper->connector_count; j++) {
 495                         connector = fb_helper->connector_info[j]->connector;
 496                         connector->dpms = dpms_mode;
 497                         drm_connector_property_set_value(connector,
 498                                                          dev->mode_config.dpms_property,
 499                                                          dpms_mode);
 500                 }
 501                 /* Found a CRTC on this fb, now find encoders */
 502                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 503                         if (encoder->crtc == crtc) {
 504                                 struct drm_encoder_helper_funcs *encoder_funcs;
 505
 506                                 encoder_funcs = encoder->helper_private;
 507                                 encoder_funcs->dpms(encoder, dpms_mode);
 508                         }
 509                 }
 510                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 511         }
 512         mutex_unlock(&dev->mode_config.mutex);
 513 }
 514
 515 int drm_fb_helper_blank(int blank, struct fb_info *info)
 516 {
 517         switch (blank) {
 518         /* Display: On; HSync: On, VSync: On */
 519         case FB_BLANK_UNBLANK:
 520                 drm_fb_helper_on(info);
 521                 break;
 522         /* Display: Off; HSync: On, VSync: On */
 523         case FB_BLANK_NORMAL:
 524                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 525                 break;
 526         /* Display: Off; HSync: Off, VSync: On */
 527         case FB_BLANK_HSYNC_SUSPEND:
 528                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 529                 break;
 530         /* Display: Off; HSync: On, VSync: Off */
 531         case FB_BLANK_VSYNC_SUSPEND:
 532                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 533                 break;
 534         /* Display: Off; HSync: Off, VSync: Off */
 535         case FB_BLANK_POWERDOWN:
 536                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 537                 break;
 538         }
 539         return 0;
 540 }
 541 EXPORT_SYMBOL(drm_fb_helper_blank);
 542
 543 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 544 {
 545         int i;
 546
 547         for (i = 0; i < helper->connector_count; i++)
 548                 kfree(helper->connector_info[i]);
 549         kfree(helper->connector_info);
 550         for (i = 0; i < helper->crtc_count; i++)
 551                 kfree(helper->crtc_info[i].mode_set.connectors);
 552         kfree(helper->crtc_info);
 553 }
 554
 555 int drm_fb_helper_init(struct drm_device *dev,
 556                        struct drm_fb_helper *fb_helper,
 557                        int crtc_count, int max_conn_count)
 558 {
 559         struct drm_crtc *crtc;
 560         int ret = 0;
 561         int i;
 562
 563         fb_helper->dev = dev;
 564
 565         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 566
 567         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 568         if (!fb_helper->crtc_info)
 569                 return -ENOMEM;
 570
 571         fb_helper->crtc_count = crtc_count;
 572         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 573         if (!fb_helper->connector_info) {
 574                 kfree(fb_helper->crtc_info);
 575                 return -ENOMEM;
 576         }
 577         fb_helper->connector_count = 0;
 578
 579         for (i = 0; i < crtc_count; i++) {
 580                 fb_helper->crtc_info[i].mode_set.connectors =
 581                         kcalloc(max_conn_count,
 582                                 sizeof(struct drm_connector *),
 583                                 GFP_KERNEL);
 584
 585                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 586                         ret = -ENOMEM;
 587                         goto out_free;
 588                 }
 589                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 590         }
 591
 592         i = 0;
 593         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 594                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 595                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 596                 i++;
 597         }
 598         fb_helper->conn_limit = max_conn_count;
 599         return 0;
 600 out_free:
 601         drm_fb_helper_crtc_free(fb_helper);
 602         return -ENOMEM;
 603 }
 604 EXPORT_SYMBOL(drm_fb_helper_init);
 605
 606 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 607 {
 608         if (!list_empty(&fb_helper->kernel_fb_list)) {
 609                 list_del(&fb_helper->kernel_fb_list);
 610                 if (list_empty(&kernel_fb_helper_list)) {
 611                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 612                         atomic_notifier_chain_unregister(&panic_notifier_list,
 613                                                          &paniced);
 614                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 615                 }
 616         }
 617
 618         drm_fb_helper_crtc_free(fb_helper);
 619
 620 }
 621 EXPORT_SYMBOL(drm_fb_helper_fini);
 622
 623 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 624                      u16 blue, u16 regno, struct fb_info *info)
 625 {
 626         struct drm_fb_helper *fb_helper = info->par;
 627         struct drm_framebuffer *fb = fb_helper->fb;
 628         int pindex;
 629
 630         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 631                 u32 *palette;
 632                 u32 value;
 633                 /* place color in psuedopalette */
 634                 if (regno > 16)
 635                         return -EINVAL;
 636                 palette = (u32 *)info->pseudo_palette;
 637                 red >>= (16 - info->var.red.length);
 638                 green >>= (16 - info->var.green.length);
 639                 blue >>= (16 - info->var.blue.length);
 640                 value = (red << info->var.red.offset) |
 641                         (green << info->var.green.offset) |
 642                         (blue << info->var.blue.offset);
 643                 if (info->var.transp.length > 0) {
 644                         u32 mask = (1 << info->var.transp.length) - 1;
 645                         mask <<= info->var.transp.offset;
 646                         value |= mask;
 647                 }
 648                 palette[regno] = value;
 649                 return 0;
 650         }
 651
 652         pindex = regno;
 653
 654         if (fb->bits_per_pixel == 16) {
 655                 pindex = regno << 3;
 656
 657                 if (fb->depth == 16 && regno > 63)
 658                         return -EINVAL;
 659                 if (fb->depth == 15 && regno > 31)
 660                         return -EINVAL;
 661
 662                 if (fb->depth == 16) {
 663                         u16 r, g, b;
 664                         int i;
 665                         if (regno < 32) {
 666                                 for (i = 0; i < 8; i++)
 667                                         fb_helper->funcs->gamma_set(crtc, red,
 668                                                 green, blue, pindex + i);
 669                         }
 670
 671                         fb_helper->funcs->gamma_get(crtc, &r,
 672                                                     &g, &b,
 673                                                     pindex >> 1);
 674
 675                         for (i = 0; i < 4; i++)
 676                                 fb_helper->funcs->gamma_set(crtc, r,
 677                                                             green, b,
 678                                                             (pindex >> 1) + i);
 679                 }
 680         }
 681
 682         if (fb->depth != 16)
 683                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 684         return 0;
 685 }
 686
 687 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 688 {
 689         struct drm_fb_helper *fb_helper = info->par;
 690         struct drm_crtc_helper_funcs *crtc_funcs;
 691         u16 *red, *green, *blue, *transp;
 692         struct drm_crtc *crtc;
 693         int i, j, rc = 0;
 694         int start;
 695
 696         for (i = 0; i < fb_helper->crtc_count; i++) {
 697                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 698                 crtc_funcs = crtc->helper_private;
 699
 700                 red = cmap->red;
 701                 green = cmap->green;
 702                 blue = cmap->blue;
 703                 transp = cmap->transp;
 704                 start = cmap->start;
 705
 706                 for (j = 0; j < cmap->len; j++) {
 707                         u16 hred, hgreen, hblue, htransp = 0xffff;
 708
 709                         hred = *red++;
 710                         hgreen = *green++;
 711                         hblue = *blue++;
 712
 713                         if (transp)
 714                                 htransp = *transp++;
 715
 716                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 717                         if (rc)
 718                                 return rc;
 719                 }
 720                 crtc_funcs->load_lut(crtc);
 721         }
 722         return rc;
 723 }
 724 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 725
 726 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 727                             struct fb_info *info)
 728 {
 729         struct drm_fb_helper *fb_helper = info->par;
 730         struct drm_framebuffer *fb = fb_helper->fb;
 731         int depth;
 732
 733         if (var->pixclock != 0 || in_dbg_master())
 734                 return -EINVAL;
 735
 736         /* Need to resize the fb object !!! */
 737         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 738                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 739                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 740                           fb->width, fb->height, fb->bits_per_pixel);
 741                 return -EINVAL;
 742         }
 743
 744         switch (var->bits_per_pixel) {
 745         case 16:
 746                 depth = (var->green.length == 6) ? 16 : 15;
 747                 break;
 748         case 32:
 749                 depth = (var->transp.length > 0) ? 32 : 24;
 750                 break;
 751         default:
 752                 depth = var->bits_per_pixel;
 753                 break;
 754         }
 755
 756         switch (depth) {
 757         case 8:
 758                 var->red.offset = 0;
 759                 var->green.offset = 0;
 760                 var->blue.offset = 0;
 761                 var->red.length = 8;
 762                 var->green.length = 8;
 763                 var->blue.length = 8;
 764                 var->transp.length = 0;
 765                 var->transp.offset = 0;
 766                 break;
 767         case 15:
 768                 var->red.offset = 10;
 769                 var->green.offset = 5;
 770                 var->blue.offset = 0;
 771                 var->red.length = 5;
 772                 var->green.length = 5;
 773                 var->blue.length = 5;
 774                 var->transp.length = 1;
 775                 var->transp.offset = 15;
 776                 break;
 777         case 16:
 778                 var->red.offset = 11;
 779                 var->green.offset = 5;
 780                 var->blue.offset = 0;
 781                 var->red.length = 5;
 782                 var->green.length = 6;
 783                 var->blue.length = 5;
 784                 var->transp.length = 0;
 785                 var->transp.offset = 0;
 786                 break;
 787         case 24:
 788                 var->red.offset = 16;
 789                 var->green.offset = 8;
 790                 var->blue.offset = 0;
 791                 var->red.length = 8;
 792                 var->green.length = 8;
 793                 var->blue.length = 8;
 794                 var->transp.length = 0;
 795                 var->transp.offset = 0;
 796                 break;
 797         case 32:
 798                 var->red.offset = 16;
 799                 var->green.offset = 8;
 800                 var->blue.offset = 0;
 801                 var->red.length = 8;
 802                 var->green.length = 8;
 803                 var->blue.length = 8;
 804                 var->transp.length = 8;
 805                 var->transp.offset = 24;
 806                 break;
 807         default:
 808                 return -EINVAL;
 809         }
 810         return 0;
 811 }
 812 EXPORT_SYMBOL(drm_fb_helper_check_var);
 813
 814 /* this will let fbcon do the mode init */
 815 int drm_fb_helper_set_par(struct fb_info *info)
 816 {
 817         struct drm_fb_helper *fb_helper = info->par;
 818         struct drm_device *dev = fb_helper->dev;
 819         struct fb_var_screeninfo *var = &info->var;
 820         struct drm_crtc *crtc;
 821         int ret;
 822         int i;
 823
 824         if (var->pixclock != 0) {
 825                 DRM_ERROR("PIXEL CLOCK SET\n");
 826                 return -EINVAL;
 827         }
 828
 829         mutex_lock(&dev->mode_config.mutex);
 830         for (i = 0; i < fb_helper->crtc_count; i++) {
 831                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 832                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 833                 if (ret) {
 834                         mutex_unlock(&dev->mode_config.mutex);
 835                         return ret;
 836                 }
 837         }
 838         mutex_unlock(&dev->mode_config.mutex);
 839
 840         if (fb_helper->delayed_hotplug) {
 841                 fb_helper->delayed_hotplug = false;
 842                 drm_fb_helper_hotplug_event(fb_helper);
 843         }
 844         return 0;
 845 }
 846 EXPORT_SYMBOL(drm_fb_helper_set_par);
 847
 848 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 849                               struct fb_info *info)
 850 {
 851         struct drm_fb_helper *fb_helper = info->par;
 852         struct drm_device *dev = fb_helper->dev;
 853         struct drm_mode_set *modeset;
 854         struct drm_crtc *crtc;
 855         int ret = 0;
 856         int i;
 857
 858         mutex_lock(&dev->mode_config.mutex);
 859         for (i = 0; i < fb_helper->crtc_count; i++) {
 860                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 861
 862                 modeset = &fb_helper->crtc_info[i].mode_set;
 863
 864                 modeset->x = var->xoffset;
 865                 modeset->y = var->yoffset;
 866
 867                 if (modeset->num_connectors) {
 868                         ret = crtc->funcs->set_config(modeset);
 869                         if (!ret) {
 870                                 info->var.xoffset = var->xoffset;
 871                                 info->var.yoffset = var->yoffset;
 872                         }
 873                 }
 874         }
 875         mutex_unlock(&dev->mode_config.mutex);
 876         return ret;
 877 }
 878 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 879
 880 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 881                                   int preferred_bpp)
 882 {
 883         int new_fb = 0;
 884         int crtc_count = 0;
 885         int i;
 886         struct fb_info *info;
 887         struct drm_fb_helper_surface_size sizes;
 888         int gamma_size = 0;
 889
 890         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 891         sizes.surface_depth = 24;
 892         sizes.surface_bpp = 32;
 893         sizes.fb_width = (unsigned)-1;
 894         sizes.fb_height = (unsigned)-1;
 895
 896         /* if driver picks 8 or 16 by default use that
 897            for both depth/bpp */
 898         if (preferred_bpp != sizes.surface_bpp) {
 899                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 900         }
 901         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 902         for (i = 0; i < fb_helper->connector_count; i++) {
 903                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 904                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 905
 906                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 907
 908                 if (cmdline_mode->bpp_specified) {
 909                         switch (cmdline_mode->bpp) {
 910                         case 8:
 911                                 sizes.surface_depth = sizes.surface_bpp = 8;
 912                                 break;
 913                         case 15:
 914                                 sizes.surface_depth = 15;
 915                                 sizes.surface_bpp = 16;
 916                                 break;
 917                         case 16:
 918                                 sizes.surface_depth = sizes.surface_bpp = 16;
 919                                 break;
 920                         case 24:
 921                                 sizes.surface_depth = sizes.surface_bpp = 24;
 922                                 break;
 923                         case 32:
 924                                 sizes.surface_depth = 24;
 925                                 sizes.surface_bpp = 32;
 926                                 break;
 927                         }
 928                         break;
 929                 }
 930         }
 931
 932         crtc_count = 0;
 933         for (i = 0; i < fb_helper->crtc_count; i++) {
 934                 struct drm_display_mode *desired_mode;
 935                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 936
 937                 if (desired_mode) {
 938                         if (gamma_size == 0)
 939                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 940                         if (desired_mode->hdisplay < sizes.fb_width)
 941                                 sizes.fb_width = desired_mode->hdisplay;
 942                         if (desired_mode->vdisplay < sizes.fb_height)
 943                                 sizes.fb_height = desired_mode->vdisplay;
 944                         if (desired_mode->hdisplay > sizes.surface_width)
 945                                 sizes.surface_width = desired_mode->hdisplay;
 946                         if (desired_mode->vdisplay > sizes.surface_height)
 947                                 sizes.surface_height = desired_mode->vdisplay;
 948                         crtc_count++;
 949                 }
 950         }
 951
 952         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 953                 /* hmm everyone went away - assume VGA cable just fell out
 954                    and will come back later. */
 955                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 956                 sizes.fb_width = sizes.surface_width = 1024;
 957                 sizes.fb_height = sizes.surface_height = 768;
 958         }
 959
 960         /* push down into drivers */
 961         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 962         if (new_fb < 0)
 963                 return new_fb;
 964
 965         info = fb_helper->fbdev;
 966
 967         /* set the fb pointer */
 968         for (i = 0; i < fb_helper->crtc_count; i++) {
 969                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 970         }
 971
 972         if (new_fb) {
 973                 info->var.pixclock = 0;
 974                 if (register_framebuffer(info) < 0) {
 975                         return -EINVAL;
 976                 }
 977
 978                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 979                        info->fix.id);
 980
 981         } else {
 982                 drm_fb_helper_set_par(info);
 983         }
 984
 985         /* Switch back to kernel console on panic */
 986         /* multi card linked list maybe */
 987         if (list_empty(&kernel_fb_helper_list)) {
 988                 printk(KERN_INFO "drm: registered panic notifier\n");
 989                 atomic_notifier_chain_register(&panic_notifier_list,
 990                                                &paniced);
 991                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 992         }
 993         if (new_fb)
 994                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 995
 996         return 0;
 997 }
 998 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 999
1000 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1001                             uint32_t depth)
1002 {
1003         info->fix.type = FB_TYPE_PACKED_PIXELS;
1004         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1005                 FB_VISUAL_TRUECOLOR;
1006         info->fix.mmio_start = 0;
1007         info->fix.mmio_len = 0;
1008         info->fix.type_aux = 0;
1009         info->fix.xpanstep = 1; /* doing it in hw */
1010         info->fix.ypanstep = 1; /* doing it in hw */
1011         info->fix.ywrapstep = 0;
1012         info->fix.accel = FB_ACCEL_NONE;
1013         info->fix.type_aux = 0;
1014
1015         info->fix.line_length = pitch;
1016         return;
1017 }
1018 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1019
1020 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1021                             uint32_t fb_width, uint32_t fb_height)
1022 {
1023         struct drm_framebuffer *fb = fb_helper->fb;
1024         info->pseudo_palette = fb_helper->pseudo_palette;
1025         info->var.xres_virtual = fb->width;
1026         info->var.yres_virtual = fb->height;
1027         info->var.bits_per_pixel = fb->bits_per_pixel;
1028         info->var.accel_flags = FB_ACCELF_TEXT;
1029         info->var.xoffset = 0;
1030         info->var.yoffset = 0;
1031         info->var.activate = FB_ACTIVATE_NOW;
1032         info->var.height = -1;
1033         info->var.width = -1;
1034
1035         switch (fb->depth) {
1036         case 8:
1037                 info->var.red.offset = 0;
1038                 info->var.green.offset = 0;
1039                 info->var.blue.offset = 0;
1040                 info->var.red.length = 8; /* 8bit DAC */
1041                 info->var.green.length = 8;
1042                 info->var.blue.length = 8;
1043                 info->var.transp.offset = 0;
1044                 info->var.transp.length = 0;
1045                 break;
1046         case 15:
1047                 info->var.red.offset = 10;
1048                 info->var.green.offset = 5;
1049                 info->var.blue.offset = 0;
1050                 info->var.red.length = 5;
1051                 info->var.green.length = 5;
1052                 info->var.blue.length = 5;
1053                 info->var.transp.offset = 15;
1054                 info->var.transp.length = 1;
1055                 break;
1056         case 16:
1057                 info->var.red.offset = 11;
1058                 info->var.green.offset = 5;
1059                 info->var.blue.offset = 0;
1060                 info->var.red.length = 5;
1061                 info->var.green.length = 6;
1062                 info->var.blue.length = 5;
1063                 info->var.transp.offset = 0;
1064                 break;
1065         case 24:
1066                 info->var.red.offset = 16;
1067                 info->var.green.offset = 8;
1068                 info->var.blue.offset = 0;
1069                 info->var.red.length = 8;
1070                 info->var.green.length = 8;
1071                 info->var.blue.length = 8;
1072                 info->var.transp.offset = 0;
1073                 info->var.transp.length = 0;
1074                 break;
1075         case 32:
1076                 info->var.red.offset = 16;
1077                 info->var.green.offset = 8;
1078                 info->var.blue.offset = 0;
1079                 info->var.red.length = 8;
1080                 info->var.green.length = 8;
1081                 info->var.blue.length = 8;
1082                 info->var.transp.offset = 24;
1083                 info->var.transp.length = 8;
1084                 break;
1085         default:
1086                 break;
1087         }
1088
1089         info->var.xres = fb_width;
1090         info->var.yres = fb_height;
1091 }
1092 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1093
1094 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1095                                                uint32_t maxX,
1096                                                uint32_t maxY)
1097 {
1098         struct drm_connector *connector;
1099         int count = 0;
1100         int i;
1101
1102         for (i = 0; i < fb_helper->connector_count; i++) {
1103                 connector = fb_helper->connector_info[i]->connector;
1104                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1105         }
1106
1107         return count;
1108 }
1109
1110 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1111 {
1112         struct drm_display_mode *mode;
1113
1114         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1115                 if (drm_mode_width(mode) > width ||
1116                     drm_mode_height(mode) > height)
1117                         continue;
1118                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1119                         return mode;
1120         }
1121         return NULL;
1122 }
1123
1124 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1125 {
1126         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1127         cmdline_mode = &fb_connector->cmdline_mode;
1128         return cmdline_mode->specified;
1129 }
1130
1131 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1132                                                       int width, int height)
1133 {
1134         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1135         struct drm_display_mode *mode = NULL;
1136
1137         cmdline_mode = &fb_helper_conn->cmdline_mode;
1138         if (cmdline_mode->specified == false)
1139                 return mode;
1140
1141         /* attempt to find a matching mode in the list of modes
1142          *  we have gotten so far, if not add a CVT mode that conforms
1143          */
1144         if (cmdline_mode->rb || cmdline_mode->margins)
1145                 goto create_mode;
1146
1147         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1148                 /* check width/height */
1149                 if (mode->hdisplay != cmdline_mode->xres ||
1150                     mode->vdisplay != cmdline_mode->yres)
1151                         continue;
1152
1153                 if (cmdline_mode->refresh_specified) {
1154                         if (mode->vrefresh != cmdline_mode->refresh)
1155                                 continue;
1156                 }
1157
1158                 if (cmdline_mode->interlace) {
1159                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1160                                 continue;
1161                 }
1162                 return mode;
1163         }
1164
1165 create_mode:
1166         if (cmdline_mode->cvt)
1167                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1168                                     cmdline_mode->xres, cmdline_mode->yres,
1169                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1170                                     cmdline_mode->rb, cmdline_mode->interlace,
1171                                     cmdline_mode->margins);
1172         else
1173                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1174                                     cmdline_mode->xres, cmdline_mode->yres,
1175                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1176                                     cmdline_mode->interlace,
1177                                     cmdline_mode->margins);
1178         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1179         list_add(&mode->head, &fb_helper_conn->connector->modes);
1180         return mode;
1181 }
1182
1183 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1184 {
1185         bool enable;
1186
1187         if (strict) {
1188                 enable = connector->status == connector_status_connected;
1189         } else {
1190                 enable = connector->status != connector_status_disconnected;
1191         }
1192         return enable;
1193 }
1194
1195 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1196                                   bool *enabled)
1197 {
1198         bool any_enabled = false;
1199         struct drm_connector *connector;
1200         int i = 0;
1201
1202         for (i = 0; i < fb_helper->connector_count; i++) {
1203                 connector = fb_helper->connector_info[i]->connector;
1204                 enabled[i] = drm_connector_enabled(connector, true);
1205                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1206                           enabled[i] ? "yes" : "no");
1207                 any_enabled |= enabled[i];
1208         }
1209
1210         if (any_enabled)
1211                 return;
1212
1213         for (i = 0; i < fb_helper->connector_count; i++) {
1214                 connector = fb_helper->connector_info[i]->connector;
1215                 enabled[i] = drm_connector_enabled(connector, false);
1216         }
1217 }
1218
1219 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1220                               struct drm_display_mode **modes,
1221                               bool *enabled, int width, int height)
1222 {
1223         int count, i, j;
1224         bool can_clone = false;
1225         struct drm_fb_helper_connector *fb_helper_conn;
1226         struct drm_display_mode *dmt_mode, *mode;
1227
1228         /* only contemplate cloning in the single crtc case */
1229         if (fb_helper->crtc_count > 1)
1230                 return false;
1231
1232         count = 0;
1233         for (i = 0; i < fb_helper->connector_count; i++) {
1234                 if (enabled[i])
1235                         count++;
1236         }
1237
1238         /* only contemplate cloning if more than one connector is enabled */
1239         if (count <= 1)
1240                 return false;
1241
1242         /* check the command line or if nothing common pick 1024x768 */
1243         can_clone = true;
1244         for (i = 0; i < fb_helper->connector_count; i++) {
1245                 if (!enabled[i])
1246                         continue;
1247                 fb_helper_conn = fb_helper->connector_info[i];
1248                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1249                 if (!modes[i]) {
1250                         can_clone = false;
1251                         break;
1252                 }
1253                 for (j = 0; j < i; j++) {
1254                         if (!enabled[j])
1255                                 continue;
1256                         if (!drm_mode_equal(modes[j], modes[i]))
1257                                 can_clone = false;
1258                 }
1259         }
1260
1261         if (can_clone) {
1262                 DRM_DEBUG_KMS("can clone using command line\n");
1263                 return true;
1264         }
1265
1266         /* try and find a 1024x768 mode on each connector */
1267         can_clone = true;
1268         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1269
1270         for (i = 0; i < fb_helper->connector_count; i++) {
1271
1272                 if (!enabled[i])
1273                         continue;
1274
1275                 fb_helper_conn = fb_helper->connector_info[i];
1276                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1277                         if (drm_mode_equal(mode, dmt_mode))
1278                                 modes[i] = mode;
1279                 }
1280                 if (!modes[i])
1281                         can_clone = false;
1282         }
1283
1284         if (can_clone) {
1285                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1286                 return true;
1287         }
1288         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1289         return false;
1290 }
1291
1292 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1293                                  struct drm_display_mode **modes,
1294                                  bool *enabled, int width, int height)
1295 {
1296         struct drm_fb_helper_connector *fb_helper_conn;
1297         int i;
1298
1299         for (i = 0; i < fb_helper->connector_count; i++) {
1300                 fb_helper_conn = fb_helper->connector_info[i];
1301
1302                 if (enabled[i] == false)
1303                         continue;
1304
1305                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1306                               fb_helper_conn->connector->base.id);
1307
1308                 /* got for command line mode first */
1309                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1310                 if (!modes[i]) {
1311                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1312                                       fb_helper_conn->connector->base.id);
1313                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1314                 }
1315                 /* No preferred modes, pick one off the list */
1316                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1317                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1318                                 break;
1319                 }
1320                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1321                           "none");
1322         }
1323         return true;
1324 }
1325
1326 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1327                           struct drm_fb_helper_crtc **best_crtcs,
1328                           struct drm_display_mode **modes,
1329                           int n, int width, int height)
1330 {
1331         int c, o;
1332         struct drm_device *dev = fb_helper->dev;
1333         struct drm_connector *connector;
1334         struct drm_connector_helper_funcs *connector_funcs;
1335         struct drm_encoder *encoder;
1336         struct drm_fb_helper_crtc *best_crtc;
1337         int my_score, best_score, score;
1338         struct drm_fb_helper_crtc **crtcs, *crtc;
1339         struct drm_fb_helper_connector *fb_helper_conn;
1340
1341         if (n == fb_helper->connector_count)
1342                 return 0;
1343
1344         fb_helper_conn = fb_helper->connector_info[n];
1345         connector = fb_helper_conn->connector;
1346
1347         best_crtcs[n] = NULL;
1348         best_crtc = NULL;
1349         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1350         if (modes[n] == NULL)
1351                 return best_score;
1352
1353         crtcs = kzalloc(dev->mode_config.num_connector *
1354                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1355         if (!crtcs)
1356                 return best_score;
1357
1358         my_score = 1;
1359         if (connector->status == connector_status_connected)
1360                 my_score++;
1361         if (drm_has_cmdline_mode(fb_helper_conn))
1362                 my_score++;
1363         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1364                 my_score++;
1365
1366         connector_funcs = connector->helper_private;
1367         encoder = connector_funcs->best_encoder(connector);
1368         if (!encoder)
1369                 goto out;
1370
1371         /* select a crtc for this connector and then attempt to configure
1372            remaining connectors */
1373         for (c = 0; c < fb_helper->crtc_count; c++) {
1374                 crtc = &fb_helper->crtc_info[c];
1375
1376                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1377                         continue;
1378                 }
1379
1380                 for (o = 0; o < n; o++)
1381                         if (best_crtcs[o] == crtc)
1382                                 break;
1383
1384                 if (o < n) {
1385                         /* ignore cloning unless only a single crtc */
1386                         if (fb_helper->crtc_count > 1)
1387                                 continue;
1388
1389                         if (!drm_mode_equal(modes[o], modes[n]))
1390                                 continue;
1391                 }
1392
1393                 crtcs[n] = crtc;
1394                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1395                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1396                                                   width, height);
1397                 if (score > best_score) {
1398                         best_crtc = crtc;
1399                         best_score = score;
1400                         memcpy(best_crtcs, crtcs,
1401                                dev->mode_config.num_connector *
1402                                sizeof(struct drm_fb_helper_crtc *));
1403                 }
1404         }
1405 out:
1406         kfree(crtcs);
1407         return best_score;
1408 }
1409
1410 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1411 {
1412         struct drm_device *dev = fb_helper->dev;
1413         struct drm_fb_helper_crtc **crtcs;
1414         struct drm_display_mode **modes;
1415         struct drm_encoder *encoder;
1416         struct drm_mode_set *modeset;
1417         bool *enabled;
1418         int width, height;
1419         int i, ret;
1420
1421         DRM_DEBUG_KMS("\n");
1422
1423         width = dev->mode_config.max_width;
1424         height = dev->mode_config.max_height;
1425
1426         /* clean out all the encoder/crtc combos */
1427         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1428                 encoder->crtc = NULL;
1429         }
1430
1431         crtcs = kcalloc(dev->mode_config.num_connector,
1432                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1433         modes = kcalloc(dev->mode_config.num_connector,
1434                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1435         enabled = kcalloc(dev->mode_config.num_connector,
1436                           sizeof(bool), GFP_KERNEL);
1437
1438         drm_enable_connectors(fb_helper, enabled);
1439
1440         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1441         if (!ret) {
1442                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1443                 if (!ret)
1444                         DRM_ERROR("Unable to find initial modes\n");
1445         }
1446
1447         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1448
1449         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1450
1451         /* need to set the modesets up here for use later */
1452         /* fill out the connector<->crtc mappings into the modesets */
1453         for (i = 0; i < fb_helper->crtc_count; i++) {
1454                 modeset = &fb_helper->crtc_info[i].mode_set;
1455                 modeset->num_connectors = 0;
1456         }
1457
1458         for (i = 0; i < fb_helper->connector_count; i++) {
1459                 struct drm_display_mode *mode = modes[i];
1460                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1461                 modeset = &fb_crtc->mode_set;
1462
1463                 if (mode && fb_crtc) {
1464                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1465                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1466                         fb_crtc->desired_mode = mode;
1467                         if (modeset->mode)
1468                                 drm_mode_destroy(dev, modeset->mode);
1469                         modeset->mode = drm_mode_duplicate(dev,
1470                                                            fb_crtc->desired_mode);
1471                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1472                 }
1473         }
1474
1475         kfree(crtcs);
1476         kfree(modes);
1477         kfree(enabled);
1478 }
1479
1480 /**
1481  * drm_helper_initial_config - setup a sane initial connector configuration
1482  * @dev: DRM device
1483  *
1484  * LOCKING:
1485  * Called at init time, must take mode config lock.
1486  *
1487  * Scan the CRTCs and connectors and try to put together an initial setup.
1488  * At the moment, this is a cloned configuration across all heads with
1489  * a new framebuffer object as the backing store.
1490  *
1491  * RETURNS:
1492  * Zero if everything went ok, nonzero otherwise.
1493  */
1494 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1495 {
1496         struct drm_device *dev = fb_helper->dev;
1497         int count = 0;
1498
1499         /* disable all the possible outputs/crtcs before entering KMS mode */
1500         drm_helper_disable_unused_functions(fb_helper->dev);
1501
1502         drm_fb_helper_parse_command_line(fb_helper);
1503
1504         count = drm_fb_helper_probe_connector_modes(fb_helper,
1505                                                     dev->mode_config.max_width,
1506                                                     dev->mode_config.max_height);
1507         /*
1508          * we shouldn't end up with no modes here.
1509          */
1510         if (count == 0) {
1511                 printk(KERN_INFO "No connectors reported connected with modes\n");
1512         }
1513         drm_setup_crtcs(fb_helper);
1514
1515         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1516 }
1517 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1518
1519 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1520 {
1521         int count = 0;
1522         u32 max_width, max_height, bpp_sel;
1523         bool bound = false, crtcs_bound = false;
1524         struct drm_crtc *crtc;
1525
1526         if (!fb_helper->fb)
1527                 return false;
1528
1529         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1530                 if (crtc->fb)
1531                         crtcs_bound = true;
1532                 if (crtc->fb == fb_helper->fb)
1533                         bound = true;
1534         }
1535
1536         if (!bound && crtcs_bound) {
1537                 fb_helper->delayed_hotplug = true;
1538                 return false;
1539         }
1540         DRM_DEBUG_KMS("\n");
1541
1542         max_width = fb_helper->fb->width;
1543         max_height = fb_helper->fb->height;
1544         bpp_sel = fb_helper->fb->bits_per_pixel;
1545
1546         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1547                                                     max_height);
1548         drm_setup_crtcs(fb_helper);
1549
1550         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1551 }
1552 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1553
1554 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
1555  * but the module doesn't depend on any fb console symbols.  At least
1556  * attempt to load fbcon to avoid leaving the system without a usable console.
1557  */
1558 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
1559 static int __init drm_fb_helper_modinit(void)
1560 {
1561         const char *name = "fbcon";
1562         struct module *fbcon;
1563
1564         mutex_lock(&module_mutex);
1565         fbcon = find_module(name);
1566         mutex_unlock(&module_mutex);
1567
1568         if (!fbcon)
1569                 request_module_nowait(name);
1570         return 0;
1571 }
1572
1573 module_init(drm_fb_helper_modinit);
1574 #endif