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 = fb_helper_conn->connector;
  98
  99         if (!fb_helper_conn)
 100                 return false;
 101
 102         cmdline_mode = &fb_helper_conn->cmdline_mode;
 103         if (!mode_option)
 104                 mode_option = fb_mode_option;
 105
 106         if (!mode_option) {
 107                 cmdline_mode->specified = false;
 108                 return false;
 109         }
 110
 111         name = mode_option;
 112         namelen = strlen(name);
 113         for (i = namelen-1; i >= 0; i--) {
 114                 switch (name[i]) {
 115                 case '@':
 116                         namelen = i;
 117                         if (!refresh_specified && !bpp_specified &&
 118                             !yres_specified) {
 119                                 refresh = simple_strtol(&name[i+1], NULL, 10);
 120                                 refresh_specified = 1;
 121                                 if (cvt || rb)
 122                                         cvt = 0;
 123                         } else
 124                                 goto done;
 125                         break;
 126                 case '-':
 127                         namelen = i;
 128                         if (!bpp_specified && !yres_specified) {
 129                                 bpp = simple_strtol(&name[i+1], NULL, 10);
 130                                 bpp_specified = 1;
 131                                 if (cvt || rb)
 132                                         cvt = 0;
 133                         } else
 134                                 goto done;
 135                         break;
 136                 case 'x':
 137                         if (!yres_specified) {
 138                                 yres = simple_strtol(&name[i+1], NULL, 10);
 139                                 yres_specified = 1;
 140                         } else
 141                                 goto done;
 142                 case '0' ... '9':
 143                         break;
 144                 case 'M':
 145                         if (!yres_specified)
 146                                 cvt = 1;
 147                         break;
 148                 case 'R':
 149                         if (cvt)
 150                                 rb = 1;
 151                         break;
 152                 case 'm':
 153                         if (!cvt)
 154                                 margins = 1;
 155                         break;
 156                 case 'i':
 157                         if (!cvt)
 158                                 interlace = 1;
 159                         break;
 160                 case 'e':
 161                         force = DRM_FORCE_ON;
 162                         break;
 163                 case 'D':
 164                         if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
 165                             (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
 166                                 force = DRM_FORCE_ON;
 167                         else
 168                                 force = DRM_FORCE_ON_DIGITAL;
 169                         break;
 170                 case 'd':
 171                         force = DRM_FORCE_OFF;
 172                         break;
 173                 default:
 174                         goto done;
 175                 }
 176         }
 177         if (i < 0 && yres_specified) {
 178                 xres = simple_strtol(name, NULL, 10);
 179                 res_specified = 1;
 180         }
 181 done:
 182
 183         DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
 184                 drm_get_connector_name(connector), xres, yres,
 185                 (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
 186                 "", (margins) ? " with margins" : "", (interlace) ?
 187                 " interlaced" : "");
 188
 189         if (force) {
 190                 const char *s;
 191                 switch (force) {
 192                 case DRM_FORCE_OFF: s = "OFF"; break;
 193                 case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
 194                 default:
 195                 case DRM_FORCE_ON: s = "ON"; break;
 196                 }
 197
 198                 DRM_INFO("forcing %s connector %s\n",
 199                          drm_get_connector_name(connector), s);
 200                 connector->force = force;
 201         }
 202
 203         if (res_specified) {
 204                 cmdline_mode->specified = true;
 205                 cmdline_mode->xres = xres;
 206                 cmdline_mode->yres = yres;
 207         }
 208
 209         if (refresh_specified) {
 210                 cmdline_mode->refresh_specified = true;
 211                 cmdline_mode->refresh = refresh;
 212         }
 213
 214         if (bpp_specified) {
 215                 cmdline_mode->bpp_specified = true;
 216                 cmdline_mode->bpp = bpp;
 217         }
 218         cmdline_mode->rb = rb ? true : false;
 219         cmdline_mode->cvt = cvt  ? true : false;
 220         cmdline_mode->interlace = interlace ? true : false;
 221
 222         return true;
 223 }
 224
 225 static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
 226 {
 227         struct drm_fb_helper_connector *fb_helper_conn;
 228         int i;
 229
 230         for (i = 0; i < fb_helper->connector_count; i++) {
 231                 char *option = NULL;
 232
 233                 fb_helper_conn = fb_helper->connector_info[i];
 234
 235                 /* do something on return - turn off connector maybe */
 236                 if (fb_get_options(drm_get_connector_name(fb_helper_conn->connector), &option))
 237                         continue;
 238
 239                 drm_fb_helper_connector_parse_command_line(fb_helper_conn, option);
 240         }
 241         return 0;
 242 }
 243
 244 int drm_fb_helper_debug_enter(struct fb_info *info)
 245 {
 246         struct drm_fb_helper *helper = info->par;
 247         struct drm_crtc_helper_funcs *funcs;
 248         int i;
 249
 250         if (list_empty(&kernel_fb_helper_list))
 251                 return false;
 252
 253         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 254                 for (i = 0; i < helper->crtc_count; i++) {
 255                         struct drm_mode_set *mode_set =
 256                                 &helper->crtc_info[i].mode_set;
 257
 258                         if (!mode_set->crtc->enabled)
 259                                 continue;
 260
 261                         funcs = mode_set->crtc->helper_private;
 262                         funcs->mode_set_base_atomic(mode_set->crtc,
 263                                                     mode_set->fb,
 264                                                     mode_set->x,
 265                                                     mode_set->y);
 266
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 273
 274 /* Find the real fb for a given fb helper CRTC */
 275 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 276 {
 277         struct drm_device *dev = crtc->dev;
 278         struct drm_crtc *c;
 279
 280         list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
 281                 if (crtc->base.id == c->base.id)
 282                         return c->fb;
 283         }
 284
 285         return NULL;
 286 }
 287
 288 int drm_fb_helper_debug_leave(struct fb_info *info)
 289 {
 290         struct drm_fb_helper *helper = info->par;
 291         struct drm_crtc *crtc;
 292         struct drm_crtc_helper_funcs *funcs;
 293         struct drm_framebuffer *fb;
 294         int i;
 295
 296         for (i = 0; i < helper->crtc_count; i++) {
 297                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 298                 crtc = mode_set->crtc;
 299                 funcs = crtc->helper_private;
 300                 fb = drm_mode_config_fb(crtc);
 301
 302                 if (!crtc->enabled)
 303                         continue;
 304
 305                 if (!fb) {
 306                         DRM_ERROR("no fb to restore??\n");
 307                         continue;
 308                 }
 309
 310                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 311                                             crtc->y);
 312         }
 313
 314         return 0;
 315 }
 316 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 317
 318 bool drm_fb_helper_force_kernel_mode(void)
 319 {
 320         int i = 0;
 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                 for (i = 0; i < helper->crtc_count; i++) {
 329                         struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 330                         ret = drm_crtc_helper_set_config(mode_set);
 331                         if (ret)
 332                                 error = true;
 333                 }
 334         }
 335         return error;
 336 }
 337
 338 int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
 339                         void *panic_str)
 340 {
 341         printk(KERN_ERR "panic occurred, switching back to text console\n");
 342         return drm_fb_helper_force_kernel_mode();
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(drm_fb_helper_panic);
 346
 347 static struct notifier_block paniced = {
 348         .notifier_call = drm_fb_helper_panic,
 349 };
 350
 351 /**
 352  * drm_fb_helper_restore - restore the framebuffer console (kernel) config
 353  *
 354  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 355  */
 356 void drm_fb_helper_restore(void)
 357 {
 358         bool ret;
 359         ret = drm_fb_helper_force_kernel_mode();
 360         if (ret == true)
 361                 DRM_ERROR("Failed to restore crtc configuration\n");
 362 }
 363 EXPORT_SYMBOL(drm_fb_helper_restore);
 364
 365 #ifdef CONFIG_MAGIC_SYSRQ
 366 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 367 {
 368         drm_fb_helper_restore();
 369 }
 370 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 371
 372 static void drm_fb_helper_sysrq(int dummy1, struct tty_struct *dummy3)
 373 {
 374         schedule_work(&drm_fb_helper_restore_work);
 375 }
 376
 377 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 378         .handler = drm_fb_helper_sysrq,
 379         .help_msg = "force-fb(V)",
 380         .action_msg = "Restore framebuffer console",
 381 };
 382 #else
 383 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 384 #endif
 385
 386 static void drm_fb_helper_on(struct fb_info *info)
 387 {
 388         struct drm_fb_helper *fb_helper = info->par;
 389         struct drm_device *dev = fb_helper->dev;
 390         struct drm_crtc *crtc;
 391         struct drm_crtc_helper_funcs *crtc_funcs;
 392         struct drm_connector *connector;
 393         struct drm_encoder *encoder;
 394         int i, j;
 395
 396         /*
 397          * For each CRTC in this fb, turn the crtc on then,
 398          * find all associated encoders and turn them on.
 399          */
 400         mutex_lock(&dev->mode_config.mutex);
 401         for (i = 0; i < fb_helper->crtc_count; i++) {
 402                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 403                 crtc_funcs = crtc->helper_private;
 404
 405                 if (!crtc->enabled)
 406                         continue;
 407
 408                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 409
 410                 /* Walk the connectors & encoders on this fb turning them on */
 411                 for (j = 0; j < fb_helper->connector_count; j++) {
 412                         connector = fb_helper->connector_info[j]->connector;
 413                         connector->dpms = DRM_MODE_DPMS_ON;
 414                         drm_connector_property_set_value(connector,
 415                                                          dev->mode_config.dpms_property,
 416                                                          DRM_MODE_DPMS_ON);
 417                 }
 418                 /* Found a CRTC on this fb, now find encoders */
 419                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 420                         if (encoder->crtc == crtc) {
 421                                 struct drm_encoder_helper_funcs *encoder_funcs;
 422
 423                                 encoder_funcs = encoder->helper_private;
 424                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 425                         }
 426                 }
 427         }
 428         mutex_unlock(&dev->mode_config.mutex);
 429 }
 430
 431 static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
 432 {
 433         struct drm_fb_helper *fb_helper = info->par;
 434         struct drm_device *dev = fb_helper->dev;
 435         struct drm_crtc *crtc;
 436         struct drm_crtc_helper_funcs *crtc_funcs;
 437         struct drm_connector *connector;
 438         struct drm_encoder *encoder;
 439         int i, j;
 440
 441         /*
 442          * For each CRTC in this fb, find all associated encoders
 443          * and turn them off, then turn off the CRTC.
 444          */
 445         mutex_lock(&dev->mode_config.mutex);
 446         for (i = 0; i < fb_helper->crtc_count; i++) {
 447                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 448                 crtc_funcs = crtc->helper_private;
 449
 450                 if (!crtc->enabled)
 451                         continue;
 452
 453                 /* Walk the connectors on this fb and mark them off */
 454                 for (j = 0; j < fb_helper->connector_count; j++) {
 455                         connector = fb_helper->connector_info[j]->connector;
 456                         connector->dpms = dpms_mode;
 457                         drm_connector_property_set_value(connector,
 458                                                          dev->mode_config.dpms_property,
 459                                                          dpms_mode);
 460                 }
 461                 /* Found a CRTC on this fb, now find encoders */
 462                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 463                         if (encoder->crtc == crtc) {
 464                                 struct drm_encoder_helper_funcs *encoder_funcs;
 465
 466                                 encoder_funcs = encoder->helper_private;
 467                                 encoder_funcs->dpms(encoder, dpms_mode);
 468                         }
 469                 }
 470                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 471         }
 472         mutex_unlock(&dev->mode_config.mutex);
 473 }
 474
 475 int drm_fb_helper_blank(int blank, struct fb_info *info)
 476 {
 477         switch (blank) {
 478         /* Display: On; HSync: On, VSync: On */
 479         case FB_BLANK_UNBLANK:
 480                 drm_fb_helper_on(info);
 481                 break;
 482         /* Display: Off; HSync: On, VSync: On */
 483         case FB_BLANK_NORMAL:
 484                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 485                 break;
 486         /* Display: Off; HSync: Off, VSync: On */
 487         case FB_BLANK_HSYNC_SUSPEND:
 488                 drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
 489                 break;
 490         /* Display: Off; HSync: On, VSync: Off */
 491         case FB_BLANK_VSYNC_SUSPEND:
 492                 drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
 493                 break;
 494         /* Display: Off; HSync: Off, VSync: Off */
 495         case FB_BLANK_POWERDOWN:
 496                 drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
 497                 break;
 498         }
 499         return 0;
 500 }
 501 EXPORT_SYMBOL(drm_fb_helper_blank);
 502
 503 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 504 {
 505         int i;
 506
 507         for (i = 0; i < helper->connector_count; i++)
 508                 kfree(helper->connector_info[i]);
 509         kfree(helper->connector_info);
 510         for (i = 0; i < helper->crtc_count; i++)
 511                 kfree(helper->crtc_info[i].mode_set.connectors);
 512         kfree(helper->crtc_info);
 513 }
 514
 515 int drm_fb_helper_init(struct drm_device *dev,
 516                        struct drm_fb_helper *fb_helper,
 517                        int crtc_count, int max_conn_count)
 518 {
 519         struct drm_crtc *crtc;
 520         int ret = 0;
 521         int i;
 522
 523         fb_helper->dev = dev;
 524
 525         INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
 526
 527         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 528         if (!fb_helper->crtc_info)
 529                 return -ENOMEM;
 530
 531         fb_helper->crtc_count = crtc_count;
 532         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 533         if (!fb_helper->connector_info) {
 534                 kfree(fb_helper->crtc_info);
 535                 return -ENOMEM;
 536         }
 537         fb_helper->connector_count = 0;
 538
 539         for (i = 0; i < crtc_count; i++) {
 540                 fb_helper->crtc_info[i].mode_set.connectors =
 541                         kcalloc(max_conn_count,
 542                                 sizeof(struct drm_connector *),
 543                                 GFP_KERNEL);
 544
 545                 if (!fb_helper->crtc_info[i].mode_set.connectors) {
 546                         ret = -ENOMEM;
 547                         goto out_free;
 548                 }
 549                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 550         }
 551
 552         i = 0;
 553         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 554                 fb_helper->crtc_info[i].crtc_id = crtc->base.id;
 555                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 556                 i++;
 557         }
 558         fb_helper->conn_limit = max_conn_count;
 559         return 0;
 560 out_free:
 561         drm_fb_helper_crtc_free(fb_helper);
 562         return -ENOMEM;
 563 }
 564 EXPORT_SYMBOL(drm_fb_helper_init);
 565
 566 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 567 {
 568         if (!list_empty(&fb_helper->kernel_fb_list)) {
 569                 list_del(&fb_helper->kernel_fb_list);
 570                 if (list_empty(&kernel_fb_helper_list)) {
 571                         printk(KERN_INFO "drm: unregistered panic notifier\n");
 572                         atomic_notifier_chain_unregister(&panic_notifier_list,
 573                                                          &paniced);
 574                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 575                 }
 576         }
 577
 578         drm_fb_helper_crtc_free(fb_helper);
 579
 580 }
 581 EXPORT_SYMBOL(drm_fb_helper_fini);
 582
 583 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
 584                      u16 blue, u16 regno, struct fb_info *info)
 585 {
 586         struct drm_fb_helper *fb_helper = info->par;
 587         struct drm_framebuffer *fb = fb_helper->fb;
 588         int pindex;
 589
 590         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 591                 u32 *palette;
 592                 u32 value;
 593                 /* place color in psuedopalette */
 594                 if (regno > 16)
 595                         return -EINVAL;
 596                 palette = (u32 *)info->pseudo_palette;
 597                 red >>= (16 - info->var.red.length);
 598                 green >>= (16 - info->var.green.length);
 599                 blue >>= (16 - info->var.blue.length);
 600                 value = (red << info->var.red.offset) |
 601                         (green << info->var.green.offset) |
 602                         (blue << info->var.blue.offset);
 603                 palette[regno] = value;
 604                 return 0;
 605         }
 606
 607         pindex = regno;
 608
 609         if (fb->bits_per_pixel == 16) {
 610                 pindex = regno << 3;
 611
 612                 if (fb->depth == 16 && regno > 63)
 613                         return -EINVAL;
 614                 if (fb->depth == 15 && regno > 31)
 615                         return -EINVAL;
 616
 617                 if (fb->depth == 16) {
 618                         u16 r, g, b;
 619                         int i;
 620                         if (regno < 32) {
 621                                 for (i = 0; i < 8; i++)
 622                                         fb_helper->funcs->gamma_set(crtc, red,
 623                                                 green, blue, pindex + i);
 624                         }
 625
 626                         fb_helper->funcs->gamma_get(crtc, &r,
 627                                                     &g, &b,
 628                                                     pindex >> 1);
 629
 630                         for (i = 0; i < 4; i++)
 631                                 fb_helper->funcs->gamma_set(crtc, r,
 632                                                             green, b,
 633                                                             (pindex >> 1) + i);
 634                 }
 635         }
 636
 637         if (fb->depth != 16)
 638                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
 639         return 0;
 640 }
 641
 642 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 643 {
 644         struct drm_fb_helper *fb_helper = info->par;
 645         struct drm_crtc_helper_funcs *crtc_funcs;
 646         u16 *red, *green, *blue, *transp;
 647         struct drm_crtc *crtc;
 648         int i, rc = 0;
 649         int start;
 650
 651         for (i = 0; i < fb_helper->crtc_count; i++) {
 652                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 653                 crtc_funcs = crtc->helper_private;
 654
 655                 red = cmap->red;
 656                 green = cmap->green;
 657                 blue = cmap->blue;
 658                 transp = cmap->transp;
 659                 start = cmap->start;
 660
 661                 for (i = 0; i < cmap->len; i++) {
 662                         u16 hred, hgreen, hblue, htransp = 0xffff;
 663
 664                         hred = *red++;
 665                         hgreen = *green++;
 666                         hblue = *blue++;
 667
 668                         if (transp)
 669                                 htransp = *transp++;
 670
 671                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
 672                         if (rc)
 673                                 return rc;
 674                 }
 675                 crtc_funcs->load_lut(crtc);
 676         }
 677         return rc;
 678 }
 679 EXPORT_SYMBOL(drm_fb_helper_setcmap);
 680
 681 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 682                             struct fb_info *info)
 683 {
 684         struct drm_fb_helper *fb_helper = info->par;
 685         struct drm_framebuffer *fb = fb_helper->fb;
 686         int depth;
 687
 688         if (var->pixclock != 0)
 689                 return -EINVAL;
 690
 691         /* Need to resize the fb object !!! */
 692         if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
 693                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
 694                           "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
 695                           fb->width, fb->height, fb->bits_per_pixel);
 696                 return -EINVAL;
 697         }
 698
 699         switch (var->bits_per_pixel) {
 700         case 16:
 701                 depth = (var->green.length == 6) ? 16 : 15;
 702                 break;
 703         case 32:
 704                 depth = (var->transp.length > 0) ? 32 : 24;
 705                 break;
 706         default:
 707                 depth = var->bits_per_pixel;
 708                 break;
 709         }
 710
 711         switch (depth) {
 712         case 8:
 713                 var->red.offset = 0;
 714                 var->green.offset = 0;
 715                 var->blue.offset = 0;
 716                 var->red.length = 8;
 717                 var->green.length = 8;
 718                 var->blue.length = 8;
 719                 var->transp.length = 0;
 720                 var->transp.offset = 0;
 721                 break;
 722         case 15:
 723                 var->red.offset = 10;
 724                 var->green.offset = 5;
 725                 var->blue.offset = 0;
 726                 var->red.length = 5;
 727                 var->green.length = 5;
 728                 var->blue.length = 5;
 729                 var->transp.length = 1;
 730                 var->transp.offset = 15;
 731                 break;
 732         case 16:
 733                 var->red.offset = 11;
 734                 var->green.offset = 5;
 735                 var->blue.offset = 0;
 736                 var->red.length = 5;
 737                 var->green.length = 6;
 738                 var->blue.length = 5;
 739                 var->transp.length = 0;
 740                 var->transp.offset = 0;
 741                 break;
 742         case 24:
 743                 var->red.offset = 16;
 744                 var->green.offset = 8;
 745                 var->blue.offset = 0;
 746                 var->red.length = 8;
 747                 var->green.length = 8;
 748                 var->blue.length = 8;
 749                 var->transp.length = 0;
 750                 var->transp.offset = 0;
 751                 break;
 752         case 32:
 753                 var->red.offset = 16;
 754                 var->green.offset = 8;
 755                 var->blue.offset = 0;
 756                 var->red.length = 8;
 757                 var->green.length = 8;
 758                 var->blue.length = 8;
 759                 var->transp.length = 8;
 760                 var->transp.offset = 24;
 761                 break;
 762         default:
 763                 return -EINVAL;
 764         }
 765         return 0;
 766 }
 767 EXPORT_SYMBOL(drm_fb_helper_check_var);
 768
 769 /* this will let fbcon do the mode init */
 770 int drm_fb_helper_set_par(struct fb_info *info)
 771 {
 772         struct drm_fb_helper *fb_helper = info->par;
 773         struct drm_device *dev = fb_helper->dev;
 774         struct fb_var_screeninfo *var = &info->var;
 775         struct drm_crtc *crtc;
 776         int ret;
 777         int i;
 778
 779         if (var->pixclock != 0) {
 780                 DRM_ERROR("PIXEL CLOCK SET\n");
 781                 return -EINVAL;
 782         }
 783
 784         mutex_lock(&dev->mode_config.mutex);
 785         for (i = 0; i < fb_helper->crtc_count; i++) {
 786                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 787                 ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 788                 if (ret) {
 789                         mutex_unlock(&dev->mode_config.mutex);
 790                         return ret;
 791                 }
 792         }
 793         mutex_unlock(&dev->mode_config.mutex);
 794
 795         if (fb_helper->delayed_hotplug) {
 796                 fb_helper->delayed_hotplug = false;
 797                 drm_fb_helper_hotplug_event(fb_helper);
 798         }
 799         return 0;
 800 }
 801 EXPORT_SYMBOL(drm_fb_helper_set_par);
 802
 803 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 804                               struct fb_info *info)
 805 {
 806         struct drm_fb_helper *fb_helper = info->par;
 807         struct drm_device *dev = fb_helper->dev;
 808         struct drm_mode_set *modeset;
 809         struct drm_crtc *crtc;
 810         int ret = 0;
 811         int i;
 812
 813         mutex_lock(&dev->mode_config.mutex);
 814         for (i = 0; i < fb_helper->crtc_count; i++) {
 815                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 816
 817                 modeset = &fb_helper->crtc_info[i].mode_set;
 818
 819                 modeset->x = var->xoffset;
 820                 modeset->y = var->yoffset;
 821
 822                 if (modeset->num_connectors) {
 823                         ret = crtc->funcs->set_config(modeset);
 824                         if (!ret) {
 825                                 info->var.xoffset = var->xoffset;
 826                                 info->var.yoffset = var->yoffset;
 827                         }
 828                 }
 829         }
 830         mutex_unlock(&dev->mode_config.mutex);
 831         return ret;
 832 }
 833 EXPORT_SYMBOL(drm_fb_helper_pan_display);
 834
 835 int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
 836                                   int preferred_bpp)
 837 {
 838         int new_fb = 0;
 839         int crtc_count = 0;
 840         int i;
 841         struct fb_info *info;
 842         struct drm_fb_helper_surface_size sizes;
 843         int gamma_size = 0;
 844
 845         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
 846         sizes.surface_depth = 24;
 847         sizes.surface_bpp = 32;
 848         sizes.fb_width = (unsigned)-1;
 849         sizes.fb_height = (unsigned)-1;
 850
 851         /* if driver picks 8 or 16 by default use that
 852            for both depth/bpp */
 853         if (preferred_bpp != sizes.surface_bpp) {
 854                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
 855         }
 856         /* first up get a count of crtcs now in use and new min/maxes width/heights */
 857         for (i = 0; i < fb_helper->connector_count; i++) {
 858                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
 859                 struct drm_fb_helper_cmdline_mode *cmdline_mode;
 860
 861                 cmdline_mode = &fb_helper_conn->cmdline_mode;
 862
 863                 if (cmdline_mode->bpp_specified) {
 864                         switch (cmdline_mode->bpp) {
 865                         case 8:
 866                                 sizes.surface_depth = sizes.surface_bpp = 8;
 867                                 break;
 868                         case 15:
 869                                 sizes.surface_depth = 15;
 870                                 sizes.surface_bpp = 16;
 871                                 break;
 872                         case 16:
 873                                 sizes.surface_depth = sizes.surface_bpp = 16;
 874                                 break;
 875                         case 24:
 876                                 sizes.surface_depth = sizes.surface_bpp = 24;
 877                                 break;
 878                         case 32:
 879                                 sizes.surface_depth = 24;
 880                                 sizes.surface_bpp = 32;
 881                                 break;
 882                         }
 883                         break;
 884                 }
 885         }
 886
 887         crtc_count = 0;
 888         for (i = 0; i < fb_helper->crtc_count; i++) {
 889                 struct drm_display_mode *desired_mode;
 890                 desired_mode = fb_helper->crtc_info[i].desired_mode;
 891
 892                 if (desired_mode) {
 893                         if (gamma_size == 0)
 894                                 gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
 895                         if (desired_mode->hdisplay < sizes.fb_width)
 896                                 sizes.fb_width = desired_mode->hdisplay;
 897                         if (desired_mode->vdisplay < sizes.fb_height)
 898                                 sizes.fb_height = desired_mode->vdisplay;
 899                         if (desired_mode->hdisplay > sizes.surface_width)
 900                                 sizes.surface_width = desired_mode->hdisplay;
 901                         if (desired_mode->vdisplay > sizes.surface_height)
 902                                 sizes.surface_height = desired_mode->vdisplay;
 903                         crtc_count++;
 904                 }
 905         }
 906
 907         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
 908                 /* hmm everyone went away - assume VGA cable just fell out
 909                    and will come back later. */
 910                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
 911                 sizes.fb_width = sizes.surface_width = 1024;
 912                 sizes.fb_height = sizes.surface_height = 768;
 913         }
 914
 915         /* push down into drivers */
 916         new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
 917         if (new_fb < 0)
 918                 return new_fb;
 919
 920         info = fb_helper->fbdev;
 921
 922         /* set the fb pointer */
 923         for (i = 0; i < fb_helper->crtc_count; i++) {
 924                 fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
 925         }
 926
 927         if (new_fb) {
 928                 info->var.pixclock = 0;
 929                 if (register_framebuffer(info) < 0) {
 930                         return -EINVAL;
 931                 }
 932
 933                 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 934                        info->fix.id);
 935
 936         } else {
 937                 drm_fb_helper_set_par(info);
 938         }
 939
 940         /* Switch back to kernel console on panic */
 941         /* multi card linked list maybe */
 942         if (list_empty(&kernel_fb_helper_list)) {
 943                 printk(KERN_INFO "drm: registered panic notifier\n");
 944                 atomic_notifier_chain_register(&panic_notifier_list,
 945                                                &paniced);
 946                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 947         }
 948         if (new_fb)
 949                 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 950
 951         return 0;
 952 }
 953 EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
 954
 955 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 956                             uint32_t depth)
 957 {
 958         info->fix.type = FB_TYPE_PACKED_PIXELS;
 959         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
 960                 FB_VISUAL_TRUECOLOR;
 961         info->fix.type_aux = 0;
 962         info->fix.xpanstep = 1; /* doing it in hw */
 963         info->fix.ypanstep = 1; /* doing it in hw */
 964         info->fix.ywrapstep = 0;
 965         info->fix.accel = FB_ACCEL_NONE;
 966         info->fix.type_aux = 0;
 967
 968         info->fix.line_length = pitch;
 969         return;
 970 }
 971 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
 972
 973 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 974                             uint32_t fb_width, uint32_t fb_height)
 975 {
 976         struct drm_framebuffer *fb = fb_helper->fb;
 977         info->pseudo_palette = fb_helper->pseudo_palette;
 978         info->var.xres_virtual = fb->width;
 979         info->var.yres_virtual = fb->height;
 980         info->var.bits_per_pixel = fb->bits_per_pixel;
 981         info->var.xoffset = 0;
 982         info->var.yoffset = 0;
 983         info->var.activate = FB_ACTIVATE_NOW;
 984         info->var.height = -1;
 985         info->var.width = -1;
 986
 987         switch (fb->depth) {
 988         case 8:
 989                 info->var.red.offset = 0;
 990                 info->var.green.offset = 0;
 991                 info->var.blue.offset = 0;
 992                 info->var.red.length = 8; /* 8bit DAC */
 993                 info->var.green.length = 8;
 994                 info->var.blue.length = 8;
 995                 info->var.transp.offset = 0;
 996                 info->var.transp.length = 0;
 997                 break;
 998         case 15:
 999                 info->var.red.offset = 10;
1000                 info->var.green.offset = 5;
1001                 info->var.blue.offset = 0;
1002                 info->var.red.length = 5;
1003                 info->var.green.length = 5;
1004                 info->var.blue.length = 5;
1005                 info->var.transp.offset = 15;
1006                 info->var.transp.length = 1;
1007                 break;
1008         case 16:
1009                 info->var.red.offset = 11;
1010                 info->var.green.offset = 5;
1011                 info->var.blue.offset = 0;
1012                 info->var.red.length = 5;
1013                 info->var.green.length = 6;
1014                 info->var.blue.length = 5;
1015                 info->var.transp.offset = 0;
1016                 break;
1017         case 24:
1018                 info->var.red.offset = 16;
1019                 info->var.green.offset = 8;
1020                 info->var.blue.offset = 0;
1021                 info->var.red.length = 8;
1022                 info->var.green.length = 8;
1023                 info->var.blue.length = 8;
1024                 info->var.transp.offset = 0;
1025                 info->var.transp.length = 0;
1026                 break;
1027         case 32:
1028                 info->var.red.offset = 16;
1029                 info->var.green.offset = 8;
1030                 info->var.blue.offset = 0;
1031                 info->var.red.length = 8;
1032                 info->var.green.length = 8;
1033                 info->var.blue.length = 8;
1034                 info->var.transp.offset = 24;
1035                 info->var.transp.length = 8;
1036                 break;
1037         default:
1038                 break;
1039         }
1040
1041         info->var.xres = fb_width;
1042         info->var.yres = fb_height;
1043 }
1044 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1045
1046 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1047                                                uint32_t maxX,
1048                                                uint32_t maxY)
1049 {
1050         struct drm_connector *connector;
1051         int count = 0;
1052         int i;
1053
1054         for (i = 0; i < fb_helper->connector_count; i++) {
1055                 connector = fb_helper->connector_info[i]->connector;
1056                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1057         }
1058
1059         return count;
1060 }
1061
1062 static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1063 {
1064         struct drm_display_mode *mode;
1065
1066         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1067                 if (drm_mode_width(mode) > width ||
1068                     drm_mode_height(mode) > height)
1069                         continue;
1070                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1071                         return mode;
1072         }
1073         return NULL;
1074 }
1075
1076 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1077 {
1078         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1079         cmdline_mode = &fb_connector->cmdline_mode;
1080         return cmdline_mode->specified;
1081 }
1082
1083 static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1084                                                       int width, int height)
1085 {
1086         struct drm_fb_helper_cmdline_mode *cmdline_mode;
1087         struct drm_display_mode *mode = NULL;
1088
1089         cmdline_mode = &fb_helper_conn->cmdline_mode;
1090         if (cmdline_mode->specified == false)
1091                 return mode;
1092
1093         /* attempt to find a matching mode in the list of modes
1094          *  we have gotten so far, if not add a CVT mode that conforms
1095          */
1096         if (cmdline_mode->rb || cmdline_mode->margins)
1097                 goto create_mode;
1098
1099         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1100                 /* check width/height */
1101                 if (mode->hdisplay != cmdline_mode->xres ||
1102                     mode->vdisplay != cmdline_mode->yres)
1103                         continue;
1104
1105                 if (cmdline_mode->refresh_specified) {
1106                         if (mode->vrefresh != cmdline_mode->refresh)
1107                                 continue;
1108                 }
1109
1110                 if (cmdline_mode->interlace) {
1111                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1112                                 continue;
1113                 }
1114                 return mode;
1115         }
1116
1117 create_mode:
1118         if (cmdline_mode->cvt)
1119                 mode = drm_cvt_mode(fb_helper_conn->connector->dev,
1120                                     cmdline_mode->xres, cmdline_mode->yres,
1121                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1122                                     cmdline_mode->rb, cmdline_mode->interlace,
1123                                     cmdline_mode->margins);
1124         else
1125                 mode = drm_gtf_mode(fb_helper_conn->connector->dev,
1126                                     cmdline_mode->xres, cmdline_mode->yres,
1127                                     cmdline_mode->refresh_specified ? cmdline_mode->refresh : 60,
1128                                     cmdline_mode->interlace,
1129                                     cmdline_mode->margins);
1130         drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1131         list_add(&mode->head, &fb_helper_conn->connector->modes);
1132         return mode;
1133 }
1134
1135 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1136 {
1137         bool enable;
1138
1139         if (strict) {
1140                 enable = connector->status == connector_status_connected;
1141         } else {
1142                 enable = connector->status != connector_status_disconnected;
1143         }
1144         return enable;
1145 }
1146
1147 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1148                                   bool *enabled)
1149 {
1150         bool any_enabled = false;
1151         struct drm_connector *connector;
1152         int i = 0;
1153
1154         for (i = 0; i < fb_helper->connector_count; i++) {
1155                 connector = fb_helper->connector_info[i]->connector;
1156                 enabled[i] = drm_connector_enabled(connector, true);
1157                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1158                           enabled[i] ? "yes" : "no");
1159                 any_enabled |= enabled[i];
1160         }
1161
1162         if (any_enabled)
1163                 return;
1164
1165         for (i = 0; i < fb_helper->connector_count; i++) {
1166                 connector = fb_helper->connector_info[i]->connector;
1167                 enabled[i] = drm_connector_enabled(connector, false);
1168         }
1169 }
1170
1171 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1172                               struct drm_display_mode **modes,
1173                               bool *enabled, int width, int height)
1174 {
1175         int count, i, j;
1176         bool can_clone = false;
1177         struct drm_fb_helper_connector *fb_helper_conn;
1178         struct drm_display_mode *dmt_mode, *mode;
1179
1180         /* only contemplate cloning in the single crtc case */
1181         if (fb_helper->crtc_count > 1)
1182                 return false;
1183
1184         count = 0;
1185         for (i = 0; i < fb_helper->connector_count; i++) {
1186                 if (enabled[i])
1187                         count++;
1188         }
1189
1190         /* only contemplate cloning if more than one connector is enabled */
1191         if (count <= 1)
1192                 return false;
1193
1194         /* check the command line or if nothing common pick 1024x768 */
1195         can_clone = true;
1196         for (i = 0; i < fb_helper->connector_count; i++) {
1197                 if (!enabled[i])
1198                         continue;
1199                 fb_helper_conn = fb_helper->connector_info[i];
1200                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1201                 if (!modes[i]) {
1202                         can_clone = false;
1203                         break;
1204                 }
1205                 for (j = 0; j < i; j++) {
1206                         if (!enabled[j])
1207                                 continue;
1208                         if (!drm_mode_equal(modes[j], modes[i]))
1209                                 can_clone = false;
1210                 }
1211         }
1212
1213         if (can_clone) {
1214                 DRM_DEBUG_KMS("can clone using command line\n");
1215                 return true;
1216         }
1217
1218         /* try and find a 1024x768 mode on each connector */
1219         can_clone = true;
1220         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
1221
1222         for (i = 0; i < fb_helper->connector_count; i++) {
1223
1224                 if (!enabled[i])
1225                         continue;
1226
1227                 fb_helper_conn = fb_helper->connector_info[i];
1228                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1229                         if (drm_mode_equal(mode, dmt_mode))
1230                                 modes[i] = mode;
1231                 }
1232                 if (!modes[i])
1233                         can_clone = false;
1234         }
1235
1236         if (can_clone) {
1237                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1238                 return true;
1239         }
1240         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1241         return false;
1242 }
1243
1244 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1245                                  struct drm_display_mode **modes,
1246                                  bool *enabled, int width, int height)
1247 {
1248         struct drm_fb_helper_connector *fb_helper_conn;
1249         int i;
1250
1251         for (i = 0; i < fb_helper->connector_count; i++) {
1252                 fb_helper_conn = fb_helper->connector_info[i];
1253
1254                 if (enabled[i] == false)
1255                         continue;
1256
1257                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1258                               fb_helper_conn->connector->base.id);
1259
1260                 /* got for command line mode first */
1261                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1262                 if (!modes[i]) {
1263                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
1264                                       fb_helper_conn->connector->base.id);
1265                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1266                 }
1267                 /* No preferred modes, pick one off the list */
1268                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1269                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1270                                 break;
1271                 }
1272                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1273                           "none");
1274         }
1275         return true;
1276 }
1277
1278 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1279                           struct drm_fb_helper_crtc **best_crtcs,
1280                           struct drm_display_mode **modes,
1281                           int n, int width, int height)
1282 {
1283         int c, o;
1284         struct drm_device *dev = fb_helper->dev;
1285         struct drm_connector *connector;
1286         struct drm_connector_helper_funcs *connector_funcs;
1287         struct drm_encoder *encoder;
1288         struct drm_fb_helper_crtc *best_crtc;
1289         int my_score, best_score, score;
1290         struct drm_fb_helper_crtc **crtcs, *crtc;
1291         struct drm_fb_helper_connector *fb_helper_conn;
1292
1293         if (n == fb_helper->connector_count)
1294                 return 0;
1295
1296         fb_helper_conn = fb_helper->connector_info[n];
1297         connector = fb_helper_conn->connector;
1298
1299         best_crtcs[n] = NULL;
1300         best_crtc = NULL;
1301         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1302         if (modes[n] == NULL)
1303                 return best_score;
1304
1305         crtcs = kzalloc(dev->mode_config.num_connector *
1306                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1307         if (!crtcs)
1308                 return best_score;
1309
1310         my_score = 1;
1311         if (connector->status == connector_status_connected)
1312                 my_score++;
1313         if (drm_has_cmdline_mode(fb_helper_conn))
1314                 my_score++;
1315         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1316                 my_score++;
1317
1318         connector_funcs = connector->helper_private;
1319         encoder = connector_funcs->best_encoder(connector);
1320         if (!encoder)
1321                 goto out;
1322
1323         /* select a crtc for this connector and then attempt to configure
1324            remaining connectors */
1325         for (c = 0; c < fb_helper->crtc_count; c++) {
1326                 crtc = &fb_helper->crtc_info[c];
1327
1328                 if ((encoder->possible_crtcs & (1 << c)) == 0) {
1329                         continue;
1330                 }
1331
1332                 for (o = 0; o < n; o++)
1333                         if (best_crtcs[o] == crtc)
1334                                 break;
1335
1336                 if (o < n) {
1337                         /* ignore cloning unless only a single crtc */
1338                         if (fb_helper->crtc_count > 1)
1339                                 continue;
1340
1341                         if (!drm_mode_equal(modes[o], modes[n]))
1342                                 continue;
1343                 }
1344
1345                 crtcs[n] = crtc;
1346                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
1347                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
1348                                                   width, height);
1349                 if (score > best_score) {
1350                         best_crtc = crtc;
1351                         best_score = score;
1352                         memcpy(best_crtcs, crtcs,
1353                                dev->mode_config.num_connector *
1354                                sizeof(struct drm_fb_helper_crtc *));
1355                 }
1356         }
1357 out:
1358         kfree(crtcs);
1359         return best_score;
1360 }
1361
1362 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
1363 {
1364         struct drm_device *dev = fb_helper->dev;
1365         struct drm_fb_helper_crtc **crtcs;
1366         struct drm_display_mode **modes;
1367         struct drm_encoder *encoder;
1368         struct drm_mode_set *modeset;
1369         bool *enabled;
1370         int width, height;
1371         int i, ret;
1372
1373         DRM_DEBUG_KMS("\n");
1374
1375         width = dev->mode_config.max_width;
1376         height = dev->mode_config.max_height;
1377
1378         /* clean out all the encoder/crtc combos */
1379         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1380                 encoder->crtc = NULL;
1381         }
1382
1383         crtcs = kcalloc(dev->mode_config.num_connector,
1384                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1385         modes = kcalloc(dev->mode_config.num_connector,
1386                         sizeof(struct drm_display_mode *), GFP_KERNEL);
1387         enabled = kcalloc(dev->mode_config.num_connector,
1388                           sizeof(bool), GFP_KERNEL);
1389
1390         drm_enable_connectors(fb_helper, enabled);
1391
1392         ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
1393         if (!ret) {
1394                 ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
1395                 if (!ret)
1396                         DRM_ERROR("Unable to find initial modes\n");
1397         }
1398
1399         DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
1400
1401         drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
1402
1403         /* need to set the modesets up here for use later */
1404         /* fill out the connector<->crtc mappings into the modesets */
1405         for (i = 0; i < fb_helper->crtc_count; i++) {
1406                 modeset = &fb_helper->crtc_info[i].mode_set;
1407                 modeset->num_connectors = 0;
1408         }
1409
1410         for (i = 0; i < fb_helper->connector_count; i++) {
1411                 struct drm_display_mode *mode = modes[i];
1412                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
1413                 modeset = &fb_crtc->mode_set;
1414
1415                 if (mode && fb_crtc) {
1416                         DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
1417                                       mode->name, fb_crtc->mode_set.crtc->base.id);
1418                         fb_crtc->desired_mode = mode;
1419                         if (modeset->mode)
1420                                 drm_mode_destroy(dev, modeset->mode);
1421                         modeset->mode = drm_mode_duplicate(dev,
1422                                                            fb_crtc->desired_mode);
1423                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
1424                 }
1425         }
1426
1427         kfree(crtcs);
1428         kfree(modes);
1429         kfree(enabled);
1430 }
1431
1432 /**
1433  * drm_helper_initial_config - setup a sane initial connector configuration
1434  * @dev: DRM device
1435  *
1436  * LOCKING:
1437  * Called at init time, must take mode config lock.
1438  *
1439  * Scan the CRTCs and connectors and try to put together an initial setup.
1440  * At the moment, this is a cloned configuration across all heads with
1441  * a new framebuffer object as the backing store.
1442  *
1443  * RETURNS:
1444  * Zero if everything went ok, nonzero otherwise.
1445  */
1446 bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
1447 {
1448         struct drm_device *dev = fb_helper->dev;
1449         int count = 0;
1450
1451         /* disable all the possible outputs/crtcs before entering KMS mode */
1452         drm_helper_disable_unused_functions(fb_helper->dev);
1453
1454         drm_fb_helper_parse_command_line(fb_helper);
1455
1456         count = drm_fb_helper_probe_connector_modes(fb_helper,
1457                                                     dev->mode_config.max_width,
1458                                                     dev->mode_config.max_height);
1459         /*
1460          * we shouldn't end up with no modes here.
1461          */
1462         if (count == 0) {
1463                 printk(KERN_INFO "No connectors reported connected with modes\n");
1464         }
1465         drm_setup_crtcs(fb_helper);
1466
1467         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1468 }
1469 EXPORT_SYMBOL(drm_fb_helper_initial_config);
1470
1471 bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
1472 {
1473         int count = 0;
1474         u32 max_width, max_height, bpp_sel;
1475         bool bound = false, crtcs_bound = false;
1476         struct drm_crtc *crtc;
1477
1478         if (!fb_helper->fb)
1479                 return false;
1480
1481         list_for_each_entry(crtc, &fb_helper->dev->mode_config.crtc_list, head) {
1482                 if (crtc->fb)
1483                         crtcs_bound = true;
1484                 if (crtc->fb == fb_helper->fb)
1485                         bound = true;
1486         }
1487
1488         if (!bound && crtcs_bound) {
1489                 fb_helper->delayed_hotplug = true;
1490                 return false;
1491         }
1492         DRM_DEBUG_KMS("\n");
1493
1494         max_width = fb_helper->fb->width;
1495         max_height = fb_helper->fb->height;
1496         bpp_sel = fb_helper->fb->bits_per_pixel;
1497
1498         count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
1499                                                     max_height);
1500         drm_setup_crtcs(fb_helper);
1501
1502         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
1503 }
1504 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
1505