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