drivers/staging/gma500/framebuffer.c

   1 /**************************************************************************
   2  * Copyright (c) 2007-2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  **************************************************************************/
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/string.h>
  24 #include <linux/mm.h>
  25 #include <linux/tty.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include <linux/fb.h>
  29 #include <linux/init.h>
  30 #include <linux/console.h>
  31
  32 #include <drm/drmP.h>
  33 #include <drm/drm.h>
  34 #include <drm/drm_crtc.h>
  35
  36 #include "psb_drv.h"
  37 #include "psb_intel_reg.h"
  38 #include "psb_intel_drv.h"
  39 #include "framebuffer.h"
  40
  41 #include "mdfld_output.h"
  42
  43 static void psb_user_framebuffer_destroy(struct drm_framebuffer *fb);
  44 static int psb_user_framebuffer_create_handle(struct drm_framebuffer *fb,
  45                                               struct drm_file *file_priv,
  46                                               unsigned int *handle);
  47
  48 static const struct drm_framebuffer_funcs psb_fb_funcs = {
  49         .destroy = psb_user_framebuffer_destroy,
  50         .create_handle = psb_user_framebuffer_create_handle,
  51 };
  52
  53 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
  54
  55 static int psbfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  56                            unsigned blue, unsigned transp,
  57                            struct fb_info *info)
  58 {
  59         struct psb_fbdev *fbdev = info->par;
  60         struct drm_framebuffer *fb = fbdev->psb_fb_helper.fb;
  61         uint32_t v;
  62
  63         if (!fb)
  64                 return -ENOMEM;
  65
  66         if (regno > 255)
  67                 return 1;
  68
  69         red = CMAP_TOHW(red, info->var.red.length);
  70         blue = CMAP_TOHW(blue, info->var.blue.length);
  71         green = CMAP_TOHW(green, info->var.green.length);
  72         transp = CMAP_TOHW(transp, info->var.transp.length);
  73
  74         v = (red << info->var.red.offset) |
  75             (green << info->var.green.offset) |
  76             (blue << info->var.blue.offset) |
  77             (transp << info->var.transp.offset);
  78
  79         if (regno < 16) {
  80                 switch (fb->bits_per_pixel) {
  81                 case 16:
  82                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  83                         break;
  84                 case 24:
  85                 case 32:
  86                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  87                         break;
  88                 }
  89         }
  90
  91         return 0;
  92 }
  93
  94
  95 void psbfb_suspend(struct drm_device *dev)
  96 {
  97         struct drm_framebuffer *fb = 0;
  98         struct psb_framebuffer *psbfb = to_psb_fb(fb);
  99
 100         console_lock();
 101         mutex_lock(&dev->mode_config.mutex);
 102         list_for_each_entry(fb, &dev->mode_config.fb_list, head) {
 103                 struct fb_info *info = psbfb->fbdev;
 104                 fb_set_suspend(info, 1);
 105                 drm_fb_helper_blank(FB_BLANK_POWERDOWN, info);
 106         }
 107         mutex_unlock(&dev->mode_config.mutex);
 108         console_unlock();
 109 }
 110
 111 void psbfb_resume(struct drm_device *dev)
 112 {
 113         struct drm_framebuffer *fb = 0;
 114         struct psb_framebuffer *psbfb = to_psb_fb(fb);
 115
 116         console_lock();
 117         mutex_lock(&dev->mode_config.mutex);
 118         list_for_each_entry(fb, &dev->mode_config.fb_list, head) {
 119                 struct fb_info *info = psbfb->fbdev;
 120                 fb_set_suspend(info, 0);
 121                 drm_fb_helper_blank(FB_BLANK_UNBLANK, info);
 122         }
 123         mutex_unlock(&dev->mode_config.mutex);
 124         console_unlock();
 125         drm_helper_disable_unused_functions(dev);
 126 }
 127
 128 static int psbfb_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 129 {
 130         struct psb_framebuffer *psbfb = vma->vm_private_data;
 131         struct drm_device *dev = psbfb->base.dev;
 132         struct drm_psb_private *dev_priv = dev->dev_private;
 133         int page_num;
 134         int i;
 135         unsigned long address;
 136         int ret;
 137         unsigned long pfn;
 138         /* FIXME: assumes fb at stolen base which may not be true */
 139         unsigned long phys_addr = (unsigned long)dev_priv->stolen_base;
 140
 141         page_num = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 142         address = (unsigned long)vmf->virtual_address;
 143
 144         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 145
 146         for (i = 0; i < page_num; i++) {
 147                 pfn = (phys_addr >> PAGE_SHIFT);
 148
 149                 ret = vm_insert_mixed(vma, address, pfn);
 150                 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
 151                         break;
 152                 else if (unlikely(ret != 0)) {
 153                         ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
 154                         return ret;
 155                 }
 156                 address += PAGE_SIZE;
 157                 phys_addr += PAGE_SIZE;
 158         }
 159         return VM_FAULT_NOPAGE;
 160 }
 161
 162 static void psbfb_vm_open(struct vm_area_struct *vma)
 163 {
 164 }
 165
 166 static void psbfb_vm_close(struct vm_area_struct *vma)
 167 {
 168 }
 169
 170 static struct vm_operations_struct psbfb_vm_ops = {
 171         .fault  = psbfb_vm_fault,
 172         .open   = psbfb_vm_open,
 173         .close  = psbfb_vm_close
 174 };
 175
 176 static int psbfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 177 {
 178         struct psb_fbdev *fbdev = info->par;
 179         struct psb_framebuffer *psbfb = &fbdev->pfb;
 180
 181         if (vma->vm_pgoff != 0)
 182                 return -EINVAL;
 183         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 184                 return -EINVAL;
 185
 186         if (!psbfb->addr_space)
 187                 psbfb->addr_space = vma->vm_file->f_mapping;
 188         /*
 189          * If this is a GEM object then info->screen_base is the virtual
 190          * kernel remapping of the object. FIXME: Review if this is
 191          * suitable for our mmap work
 192          */
 193         vma->vm_ops = &psbfb_vm_ops;
 194         vma->vm_private_data = (void *)psbfb;
 195         vma->vm_flags |= VM_RESERVED | VM_IO |
 196                                         VM_MIXEDMAP | VM_DONTEXPAND;
 197         return 0;
 198 }
 199
 200 static int psbfb_ioctl(struct fb_info *info, unsigned int cmd,
 201                                                 unsigned long arg)
 202 {
 203         return -ENOTTY;
 204 }
 205
 206 static struct fb_ops psbfb_ops = {
 207         .owner = THIS_MODULE,
 208         .fb_check_var = drm_fb_helper_check_var,
 209         .fb_set_par = drm_fb_helper_set_par,
 210         .fb_blank = drm_fb_helper_blank,
 211         .fb_setcolreg = psbfb_setcolreg,
 212         .fb_fillrect = cfb_fillrect,
 213         .fb_copyarea = psbfb_copyarea,
 214         .fb_imageblit = cfb_imageblit,
 215         .fb_mmap = psbfb_mmap,
 216         .fb_sync = psbfb_sync,
 217         .fb_ioctl = psbfb_ioctl,
 218 };
 219
 220 static struct fb_ops psbfb_unaccel_ops = {
 221         .owner = THIS_MODULE,
 222         .fb_check_var = drm_fb_helper_check_var,
 223         .fb_set_par = drm_fb_helper_set_par,
 224         .fb_blank = drm_fb_helper_blank,
 225         .fb_setcolreg = psbfb_setcolreg,
 226         .fb_fillrect = cfb_fillrect,
 227         .fb_copyarea = cfb_copyarea,
 228         .fb_imageblit = cfb_imageblit,
 229         .fb_mmap = psbfb_mmap,
 230         .fb_ioctl = psbfb_ioctl,
 231 };
 232
 233 /**
 234  *      psb_framebuffer_init    -       initialize a framebuffer
 235  *      @dev: our DRM device
 236  *      @fb: framebuffer to set up
 237  *      @mode_cmd: mode description
 238  *      @gt: backing object
 239  *
 240  *      Configure and fill in the boilerplate for our frame buffer. Return
 241  *      0 on success or an error code if we fail.
 242  */
 243 static int psb_framebuffer_init(struct drm_device *dev,
 244                                         struct psb_framebuffer *fb,
 245                                         struct drm_mode_fb_cmd *mode_cmd,
 246                                         struct gtt_range *gt)
 247 {
 248         int ret;
 249
 250         if (mode_cmd->pitch & 63)
 251                 return -EINVAL;
 252         switch (mode_cmd->bpp) {
 253         case 8:
 254         case 16:
 255         case 24:
 256         case 32:
 257                 break;
 258         default:
 259                 return -EINVAL;
 260         }
 261         ret = drm_framebuffer_init(dev, &fb->base, &psb_fb_funcs);
 262         if (ret) {
 263                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 264                 return ret;
 265         }
 266         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
 267         fb->gtt = gt;
 268         return 0;
 269 }
 270
 271 /**
 272  *      psb_framebuffer_create  -       create a framebuffer backed by gt
 273  *      @dev: our DRM device
 274  *      @mode_cmd: the description of the requested mode
 275  *      @gt: the backing object
 276  *
 277  *      Create a framebuffer object backed by the gt, and fill in the
 278  *      boilerplate required
 279  *
 280  *      TODO: review object references
 281  */
 282
 283 static struct drm_framebuffer *psb_framebuffer_create
 284                         (struct drm_device *dev,
 285                          struct drm_mode_fb_cmd *mode_cmd,
 286                          struct gtt_range *gt)
 287 {
 288         struct psb_framebuffer *fb;
 289         int ret;
 290
 291         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 292         if (!fb)
 293                 return ERR_PTR(-ENOMEM);
 294
 295         ret = psb_framebuffer_init(dev, fb, mode_cmd, gt);
 296         if (ret) {
 297                 kfree(fb);
 298                 return ERR_PTR(ret);
 299         }
 300         return &fb->base;
 301 }
 302
 303 /**
 304  *      psbfb_alloc             -       allocate frame buffer memory
 305  *      @dev: the DRM device
 306  *      @aligned_size: space needed
 307  *
 308  *      Allocate the frame buffer. In the usual case we get a GTT range that
 309  *      is stolen memory backed and life is simple. If there isn't sufficient
 310  *      stolen memory or the system has no stolen memory we allocate a range
 311  *      and back it with a GEM object.
 312  *
 313  *      In this case the GEM object has no handle.
 314  *
 315  *      FIXME: console speed up - allocate twice the space if room and use
 316  *      hardware scrolling for acceleration.
 317  */
 318 static struct gtt_range *psbfb_alloc(struct drm_device *dev, int aligned_size)
 319 {
 320         struct gtt_range *backing;
 321         /* Begin by trying to use stolen memory backing */
 322         backing = psb_gtt_alloc_range(dev, aligned_size, "fb", 1);
 323         if (backing) {
 324                 if (drm_gem_private_object_init(dev,
 325                                         &backing->gem, aligned_size) == 0)
 326                         return backing;
 327                 psb_gtt_free_range(dev, backing);
 328         }
 329         /* Next try using GEM host memory */
 330         backing = psb_gtt_alloc_range(dev, aligned_size, "fb(gem)", 0);
 331         if (backing == NULL)
 332                 return NULL;
 333
 334         /* Now back it with an object */
 335         if (drm_gem_object_init(dev, &backing->gem, aligned_size) != 0) {
 336                 psb_gtt_free_range(dev, backing);
 337                 return NULL;
 338         }
 339         return backing;
 340 }
 341
 342 /**
 343  *      psbfb_create            -       create a framebuffer
 344  *      @fbdev: the framebuffer device
 345  *      @sizes: specification of the layout
 346  *
 347  *      Create a framebuffer to the specifications provided
 348  */
 349 static int psbfb_create(struct psb_fbdev *fbdev,
 350                                 struct drm_fb_helper_surface_size *sizes)
 351 {
 352         struct drm_device *dev = fbdev->psb_fb_helper.dev;
 353         struct drm_psb_private *dev_priv = dev->dev_private;
 354         struct fb_info *info;
 355         struct drm_framebuffer *fb;
 356         struct psb_framebuffer *psbfb = &fbdev->pfb;
 357         struct drm_mode_fb_cmd mode_cmd;
 358         struct device *device = &dev->pdev->dev;
 359         int size;
 360         int ret;
 361         struct gtt_range *backing;
 362
 363         mode_cmd.width = sizes->surface_width;
 364         mode_cmd.height = sizes->surface_height;
 365         mode_cmd.bpp = sizes->surface_bpp;
 366
 367         /* No 24bit packed */
 368         if (mode_cmd.bpp == 24)
 369                 mode_cmd.bpp = 32;
 370
 371         /* HW requires pitch to be 64 byte aligned */
 372         mode_cmd.pitch =  ALIGN(mode_cmd.width * ((mode_cmd.bpp + 7) / 8), 64);
 373         mode_cmd.depth = sizes->surface_depth;
 374
 375         size = mode_cmd.pitch * mode_cmd.height;
 376         size = ALIGN(size, PAGE_SIZE);
 377
 378         /* Allocate the framebuffer in the GTT with stolen page backing */
 379         backing = psbfb_alloc(dev, size);
 380         if (backing == NULL)
 381                 return -ENOMEM;
 382
 383         mutex_lock(&dev->struct_mutex);
 384
 385         info = framebuffer_alloc(0, device);
 386         if (!info) {
 387                 ret = -ENOMEM;
 388                 goto out_err1;
 389         }
 390         info->par = fbdev;
 391
 392         ret = psb_framebuffer_init(dev, psbfb, &mode_cmd, backing);
 393         if (ret)
 394                 goto out_unref;
 395
 396         fb = &psbfb->base;
 397         psbfb->fbdev = info;
 398
 399         fbdev->psb_fb_helper.fb = fb;
 400         fbdev->psb_fb_helper.fbdev = info;
 401
 402         strcpy(info->fix.id, "psbfb");
 403
 404         info->flags = FBINFO_DEFAULT;
 405         /* No 2D engine */
 406         if (!dev_priv->ops->accel_2d)
 407                 info->fbops = &psbfb_unaccel_ops;
 408         else
 409                 info->fbops = &psbfb_ops;
 410
 411         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 412         if (ret) {
 413                 ret = -ENOMEM;
 414                 goto out_unref;
 415         }
 416
 417         info->fix.smem_start = dev->mode_config.fb_base;
 418         info->fix.smem_len = size;
 419
 420         if (backing->stolen) {
 421                 /* Accessed stolen memory directly */
 422                 info->screen_base = (char *)dev_priv->vram_addr +
 423                                                         backing->offset;
 424         } else {
 425                 /* Pin the pages into the GTT and create a mapping to them */
 426                 psb_gtt_pin(backing);
 427                 info->screen_base = vm_map_ram(backing->pages, backing->npage,
 428                                 -1, PAGE_KERNEL);
 429                 if (info->screen_base == NULL) {
 430                         psb_gtt_unpin(backing);
 431                         ret = -ENOMEM;
 432                         goto out_unref;
 433                 }
 434                 psbfb->vm_map = 1;
 435         }
 436         info->screen_size = size;
 437
 438         if (dev_priv->gtt.stolen_size) {
 439                 info->apertures = alloc_apertures(1);
 440                 if (!info->apertures) {
 441                         ret = -ENOMEM;
 442                         goto out_unref;
 443                 }
 444                 info->apertures->ranges[0].base = dev->mode_config.fb_base;
 445                 info->apertures->ranges[0].size = dev_priv->gtt.stolen_size;
 446         }
 447
 448         drm_fb_helper_fill_fix(info, fb->pitch, fb->depth);
 449         drm_fb_helper_fill_var(info, &fbdev->psb_fb_helper,
 450                                 sizes->fb_width, sizes->fb_height);
 451
 452         info->fix.mmio_start = pci_resource_start(dev->pdev, 0);
 453         info->fix.mmio_len = pci_resource_len(dev->pdev, 0);
 454
 455         info->pixmap.size = 64 * 1024;
 456         info->pixmap.buf_align = 8;
 457         info->pixmap.access_align = 32;
 458         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 459         info->pixmap.scan_align = 1;
 460
 461         dev_info(dev->dev, "allocated %dx%d fb\n",
 462                                         psbfb->base.width, psbfb->base.height);
 463
 464         mutex_unlock(&dev->struct_mutex);
 465         return 0;
 466 out_unref:
 467         if (backing->stolen)
 468                 psb_gtt_free_range(dev, backing);
 469         else {
 470                 if (psbfb->vm_map)
 471                         vm_unmap_ram(info->screen_base, backing->npage);
 472                 drm_gem_object_unreference(&backing->gem);
 473         }
 474 out_err1:
 475         mutex_unlock(&dev->struct_mutex);
 476         psb_gtt_free_range(dev, backing);
 477         return ret;
 478 }
 479
 480 /**
 481  *      psb_user_framebuffer_create     -       create framebuffer
 482  *      @dev: our DRM device
 483  *      @filp: client file
 484  *      @cmd: mode request
 485  *
 486  *      Create a new framebuffer backed by a userspace GEM object
 487  */
 488 static struct drm_framebuffer *psb_user_framebuffer_create
 489                         (struct drm_device *dev, struct drm_file *filp,
 490                          struct drm_mode_fb_cmd *cmd)
 491 {
 492         struct gtt_range *r;
 493         struct drm_gem_object *obj;
 494
 495         /*
 496          *      Find the GEM object and thus the gtt range object that is
 497          *      to back this space
 498          */
 499         obj = drm_gem_object_lookup(dev, filp, cmd->handle);
 500         if (obj == NULL)
 501                 return ERR_PTR(-ENOENT);
 502
 503         /* Let the core code do all the work */
 504         r = container_of(obj, struct gtt_range, gem);
 505         return psb_framebuffer_create(dev, cmd, r);
 506 }
 507
 508 static void psbfb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 509                                                         u16 blue, int regno)
 510 {
 511 }
 512
 513 static void psbfb_gamma_get(struct drm_crtc *crtc, u16 *red,
 514                                         u16 *green, u16 *blue, int regno)
 515 {
 516 }
 517
 518 static int psbfb_probe(struct drm_fb_helper *helper,
 519                                 struct drm_fb_helper_surface_size *sizes)
 520 {
 521         struct psb_fbdev *psb_fbdev = (struct psb_fbdev *)helper;
 522         int new_fb = 0;
 523         int ret;
 524
 525         if (!helper->fb) {
 526                 ret = psbfb_create(psb_fbdev, sizes);
 527                 if (ret)
 528                         return ret;
 529                 new_fb = 1;
 530         }
 531         return new_fb;
 532 }
 533
 534 struct drm_fb_helper_funcs psb_fb_helper_funcs = {
 535         .gamma_set = psbfb_gamma_set,
 536         .gamma_get = psbfb_gamma_get,
 537         .fb_probe = psbfb_probe,
 538 };
 539
 540 int psb_fbdev_destroy(struct drm_device *dev, struct psb_fbdev *fbdev)
 541 {
 542         struct fb_info *info;
 543         struct psb_framebuffer *psbfb = &fbdev->pfb;
 544
 545         if (fbdev->psb_fb_helper.fbdev) {
 546                 info = fbdev->psb_fb_helper.fbdev;
 547
 548                 /* If this is our base framebuffer then kill any virtual map
 549                    for the framebuffer layer and unpin it */
 550                 if (psbfb->vm_map) {
 551                         vm_unmap_ram(info->screen_base, psbfb->gtt->npage);
 552                         psb_gtt_unpin(psbfb->gtt);
 553                 }
 554                 unregister_framebuffer(info);
 555                 if (info->cmap.len)
 556                         fb_dealloc_cmap(&info->cmap);
 557                 framebuffer_release(info);
 558         }
 559         drm_fb_helper_fini(&fbdev->psb_fb_helper);
 560         drm_framebuffer_cleanup(&psbfb->base);
 561
 562         if (psbfb->gtt)
 563                 drm_gem_object_unreference(&psbfb->gtt->gem);
 564         return 0;
 565 }
 566
 567 int psb_fbdev_init(struct drm_device *dev)
 568 {
 569         struct psb_fbdev *fbdev;
 570         struct drm_psb_private *dev_priv = dev->dev_private;
 571
 572         fbdev = kzalloc(sizeof(struct psb_fbdev), GFP_KERNEL);
 573         if (!fbdev) {
 574                 dev_err(dev->dev, "no memory\n");
 575                 return -ENOMEM;
 576         }
 577
 578         dev_priv->fbdev = fbdev;
 579         fbdev->psb_fb_helper.funcs = &psb_fb_helper_funcs;
 580
 581         drm_fb_helper_init(dev, &fbdev->psb_fb_helper, dev_priv->ops->crtcs,
 582                                                         INTELFB_CONN_LIMIT);
 583
 584         drm_fb_helper_single_add_all_connectors(&fbdev->psb_fb_helper);
 585         drm_fb_helper_initial_config(&fbdev->psb_fb_helper, 32);
 586         return 0;
 587 }
 588
 589 void psb_fbdev_fini(struct drm_device *dev)
 590 {
 591         struct drm_psb_private *dev_priv = dev->dev_private;
 592
 593         if (!dev_priv->fbdev)
 594                 return;
 595
 596         psb_fbdev_destroy(dev, dev_priv->fbdev);
 597         kfree(dev_priv->fbdev);
 598         dev_priv->fbdev = NULL;
 599 }
 600
 601 static void psbfb_output_poll_changed(struct drm_device *dev)
 602 {
 603         struct drm_psb_private *dev_priv = dev->dev_private;
 604         struct psb_fbdev *fbdev = (struct psb_fbdev *)dev_priv->fbdev;
 605         drm_fb_helper_hotplug_event(&fbdev->psb_fb_helper);
 606 }
 607
 608 /**
 609  *      psb_user_framebuffer_create_handle - add hamdle to a framebuffer
 610  *      @fb: framebuffer
 611  *      @file_priv: our DRM file
 612  *      @handle: returned handle
 613  *
 614  *      Our framebuffer object is a GTT range which also contains a GEM
 615  *      object. We need to turn it into a handle for userspace. GEM will do
 616  *      the work for us
 617  */
 618 static int psb_user_framebuffer_create_handle(struct drm_framebuffer *fb,
 619                                               struct drm_file *file_priv,
 620                                               unsigned int *handle)
 621 {
 622         struct psb_framebuffer *psbfb = to_psb_fb(fb);
 623         struct gtt_range *r = psbfb->gtt;
 624         return drm_gem_handle_create(file_priv, &r->gem, handle);
 625 }
 626
 627 /**
 628  *      psb_user_framebuffer_destroy    -       destruct user created fb
 629  *      @fb: framebuffer
 630  *
 631  *      User framebuffers are backed by GEM objects so all we have to do is
 632  *      clean up a bit and drop the reference, GEM will handle the fallout
 633  */
 634 static void psb_user_framebuffer_destroy(struct drm_framebuffer *fb)
 635 {
 636         struct psb_framebuffer *psbfb = to_psb_fb(fb);
 637         struct gtt_range *r = psbfb->gtt;
 638         struct drm_device *dev = fb->dev;
 639         struct drm_psb_private *dev_priv = dev->dev_private;
 640         struct psb_fbdev *fbdev = dev_priv->fbdev;
 641         struct drm_crtc *crtc;
 642         int reset = 0;
 643
 644         /* Should never get stolen memory for a user fb */
 645         WARN_ON(r->stolen);
 646
 647         /* Check if we are erroneously live */
 648         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 649                 if (crtc->fb == fb)
 650                         reset = 1;
 651
 652         if (reset)
 653                 /*
 654                  * Now force a sane response before we permit the DRM CRTC
 655                  * layer to do stupid things like blank the display. Instead
 656                  * we reset this framebuffer as if the user had forced a reset.
 657                  * We must do this before the cleanup so that the DRM layer
 658                  * doesn't get a chance to stick its oar in where it isn't
 659                  * wanted.
 660                  */
 661                 drm_fb_helper_restore_fbdev_mode(&fbdev->psb_fb_helper);
 662
 663         /* Let DRM do its clean up */
 664         drm_framebuffer_cleanup(fb);
 665         /*  We are no longer using the resource in GEM */
 666         drm_gem_object_unreference_unlocked(&r->gem);
 667         kfree(fb);
 668 }
 669
 670 static const struct drm_mode_config_funcs psb_mode_funcs = {
 671         .fb_create = psb_user_framebuffer_create,
 672         .output_poll_changed = psbfb_output_poll_changed,
 673 };
 674
 675 static int psb_create_backlight_property(struct drm_device *dev)
 676 {
 677         struct drm_psb_private *dev_priv = dev->dev_private;
 678         struct drm_property *backlight;
 679
 680         if (dev_priv->backlight_property)
 681                 return 0;
 682
 683         backlight = drm_property_create(dev, DRM_MODE_PROP_RANGE,
 684                                                         "backlight", 2);
 685         backlight->values[0] = 0;
 686         backlight->values[1] = 100;
 687
 688         dev_priv->backlight_property = backlight;
 689
 690         return 0;
 691 }
 692
 693 static void psb_setup_outputs(struct drm_device *dev)
 694 {
 695         struct drm_psb_private *dev_priv = dev->dev_private;
 696         struct drm_connector *connector;
 697
 698         drm_mode_create_scaling_mode_property(dev);
 699         psb_create_backlight_property(dev);
 700
 701         dev_priv->ops->output_init(dev);
 702
 703         list_for_each_entry(connector, &dev->mode_config.connector_list,
 704                             head) {
 705                 struct psb_intel_output *psb_intel_output =
 706                     to_psb_intel_output(connector);
 707                 struct drm_encoder *encoder = &psb_intel_output->enc;
 708                 int crtc_mask = 0, clone_mask = 0;
 709
 710                 /* valid crtcs */
 711                 switch (psb_intel_output->type) {
 712                 case INTEL_OUTPUT_ANALOG:
 713                         crtc_mask = (1 << 0);
 714                         clone_mask = (1 << INTEL_OUTPUT_ANALOG);
 715                         break;
 716                 case INTEL_OUTPUT_SDVO:
 717                         crtc_mask = ((1 << 0) | (1 << 1));
 718                         clone_mask = (1 << INTEL_OUTPUT_SDVO);
 719                         break;
 720                 case INTEL_OUTPUT_LVDS:
 721                         if (IS_MRST(dev))
 722                                 crtc_mask = (1 << 0);
 723                         else
 724                                 crtc_mask = (1 << 1);
 725                         clone_mask = (1 << INTEL_OUTPUT_LVDS);
 726                         break;
 727                 case INTEL_OUTPUT_MIPI:
 728                         crtc_mask = (1 << 0);
 729                         clone_mask = (1 << INTEL_OUTPUT_MIPI);
 730                         break;
 731                 case INTEL_OUTPUT_MIPI2:
 732                         crtc_mask = (1 << 2);
 733                         clone_mask = (1 << INTEL_OUTPUT_MIPI2);
 734                         break;
 735                 case INTEL_OUTPUT_HDMI:
 736                         if (IS_MFLD(dev))
 737                                 crtc_mask = (1 << 1);
 738                         else    /* FIXME: review Oaktrail */
 739                                 crtc_mask = (1 << 0);   /* Cedarview */
 740                         clone_mask = (1 << INTEL_OUTPUT_HDMI);
 741                         break;
 742                 }
 743                 encoder->possible_crtcs = crtc_mask;
 744                 encoder->possible_clones =
 745                     psb_intel_connector_clones(dev, clone_mask);
 746         }
 747 }
 748
 749 void psb_modeset_init(struct drm_device *dev)
 750 {
 751         struct drm_psb_private *dev_priv =
 752             (struct drm_psb_private *) dev->dev_private;
 753         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 754         int i;
 755
 756         drm_mode_config_init(dev);
 757
 758         dev->mode_config.min_width = 0;
 759         dev->mode_config.min_height = 0;
 760
 761         dev->mode_config.funcs = (void *) &psb_mode_funcs;
 762
 763         /* set memory base */
 764         /* MRST and PSB should use BAR 2*/
 765         pci_read_config_dword(dev->pdev, PSB_BSM, (u32 *)
 766                                         &(dev->mode_config.fb_base));
 767
 768         /* num pipes is 2 for PSB but 1 for Mrst */
 769         for (i = 0; i < dev_priv->num_pipe; i++)
 770                 psb_intel_crtc_init(dev, i, mode_dev);
 771
 772         dev->mode_config.max_width = 2048;
 773         dev->mode_config.max_height = 2048;
 774
 775         psb_setup_outputs(dev);
 776 }
 777
 778 void psb_modeset_cleanup(struct drm_device *dev)
 779 {
 780         mutex_lock(&dev->struct_mutex);
 781
 782         drm_kms_helper_poll_fini(dev);
 783         psb_fbdev_fini(dev);
 784         drm_mode_config_cleanup(dev);
 785
 786         mutex_unlock(&dev->struct_mutex);
 787 }