drivers/gpu/drm/i915/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/tty.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/delay.h>
  35 #include <linux/fb.h>
  36 #include <linux/init.h>
  37 #include <linux/vga_switcheroo.h>
  38
  39 #include <drm/drmP.h>
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include "intel_drv.h"
  43 #include <drm/i915_drm.h>
  44 #include "i915_drv.h"
  45
  46 static struct fb_ops intelfb_ops = {
  47         .owner = THIS_MODULE,
  48         .fb_check_var = drm_fb_helper_check_var,
  49         .fb_set_par = drm_fb_helper_set_par,
  50         .fb_fillrect = cfb_fillrect,
  51         .fb_copyarea = cfb_copyarea,
  52         .fb_imageblit = cfb_imageblit,
  53         .fb_pan_display = drm_fb_helper_pan_display,
  54         .fb_blank = drm_fb_helper_blank,
  55         .fb_setcmap = drm_fb_helper_setcmap,
  56         .fb_debug_enter = drm_fb_helper_debug_enter,
  57         .fb_debug_leave = drm_fb_helper_debug_leave,
  58 };
  59
  60 static int intelfb_alloc(struct drm_fb_helper *helper,
  61                          struct drm_fb_helper_surface_size *sizes)
  62 {
  63         struct intel_fbdev *ifbdev =
  64                 container_of(helper, struct intel_fbdev, helper);
  65         struct drm_framebuffer *fb;
  66         struct drm_device *dev = helper->dev;
  67         struct drm_mode_fb_cmd2 mode_cmd = {};
  68         struct drm_i915_gem_object *obj;
  69         int size, ret;
  70
  71         /* we don't do packed 24bpp */
  72         if (sizes->surface_bpp == 24)
  73                 sizes->surface_bpp = 32;
  74
  75         mode_cmd.width = sizes->surface_width;
  76         mode_cmd.height = sizes->surface_height;
  77
  78         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
  79                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
  80         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  81                                                           sizes->surface_depth);
  82
  83         size = mode_cmd.pitches[0] * mode_cmd.height;
  84         size = ALIGN(size, PAGE_SIZE);
  85         obj = i915_gem_object_create_stolen(dev, size);
  86         if (obj == NULL)
  87                 obj = i915_gem_alloc_object(dev, size);
  88         if (!obj) {
  89                 DRM_ERROR("failed to allocate framebuffer\n");
  90                 ret = -ENOMEM;
  91                 goto out;
  92         }
  93
  94         /* Flush everything out, we'll be doing GTT only from now on */
  95         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
  96         if (ret) {
  97                 DRM_ERROR("failed to pin obj: %d\n", ret);
  98                 goto out_unref;
  99         }
 100
 101         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 102         if (IS_ERR(fb)) {
 103                 ret = PTR_ERR(fb);
 104                 goto out_unpin;
 105         }
 106
 107         ifbdev->fb = to_intel_framebuffer(fb);
 108
 109         return 0;
 110
 111 out_unpin:
 112         i915_gem_object_ggtt_unpin(obj);
 113 out_unref:
 114         drm_gem_object_unreference(&obj->base);
 115 out:
 116         return ret;
 117 }
 118
 119 static int intelfb_create(struct drm_fb_helper *helper,
 120                           struct drm_fb_helper_surface_size *sizes)
 121 {
 122         struct intel_fbdev *ifbdev =
 123                 container_of(helper, struct intel_fbdev, helper);
 124         struct intel_framebuffer *intel_fb = ifbdev->fb;
 125         struct drm_device *dev = helper->dev;
 126         struct drm_i915_private *dev_priv = dev->dev_private;
 127         struct fb_info *info;
 128         struct drm_framebuffer *fb;
 129         struct drm_i915_gem_object *obj;
 130         int size, ret;
 131
 132         mutex_lock(&dev->struct_mutex);
 133
 134         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 135                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 136                 ret = intelfb_alloc(helper, sizes);
 137                 if (ret)
 138                         goto out_unlock;
 139                 intel_fb = ifbdev->fb;
 140         } else {
 141                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 142                 sizes->fb_width = intel_fb->base.width;
 143                 sizes->fb_height = intel_fb->base.height;
 144         }
 145
 146         obj = intel_fb->obj;
 147         size = obj->base.size;
 148
 149         info = framebuffer_alloc(0, &dev->pdev->dev);
 150         if (!info) {
 151                 ret = -ENOMEM;
 152                 goto out_unpin;
 153         }
 154
 155         info->par = helper;
 156
 157         fb = &ifbdev->fb->base;
 158
 159         ifbdev->helper.fb = fb;
 160         ifbdev->helper.fbdev = info;
 161
 162         strcpy(info->fix.id, "inteldrmfb");
 163
 164         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 165         info->fbops = &intelfb_ops;
 166
 167         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 168         if (ret) {
 169                 ret = -ENOMEM;
 170                 goto out_unpin;
 171         }
 172         /* setup aperture base/size for vesafb takeover */
 173         info->apertures = alloc_apertures(1);
 174         if (!info->apertures) {
 175                 ret = -ENOMEM;
 176                 goto out_unpin;
 177         }
 178         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 179         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 180
 181         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 182         info->fix.smem_len = size;
 183
 184         info->screen_base =
 185                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 186                            size);
 187         if (!info->screen_base) {
 188                 ret = -ENOSPC;
 189                 goto out_unpin;
 190         }
 191         info->screen_size = size;
 192
 193         /* This driver doesn't need a VT switch to restore the mode on resume */
 194         info->skip_vt_switch = true;
 195
 196         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 197         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 198
 199         /* If the object is shmemfs backed, it will have given us zeroed pages.
 200          * If the object is stolen however, it will be full of whatever
 201          * garbage was left in there.
 202          */
 203         if (ifbdev->fb->obj->stolen)
 204                 memset_io(info->screen_base, 0, info->screen_size);
 205
 206         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 207
 208         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 209                       fb->width, fb->height,
 210                       i915_gem_obj_ggtt_offset(obj), obj);
 211
 212         mutex_unlock(&dev->struct_mutex);
 213         vga_switcheroo_client_fb_set(dev->pdev, info);
 214         return 0;
 215
 216 out_unpin:
 217         i915_gem_object_ggtt_unpin(obj);
 218         drm_gem_object_unreference(&obj->base);
 219 out_unlock:
 220         mutex_unlock(&dev->struct_mutex);
 221         return ret;
 222 }
 223
 224 /** Sets the color ramps on behalf of RandR */
 225 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 226                                     u16 blue, int regno)
 227 {
 228         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 229
 230         intel_crtc->lut_r[regno] = red >> 8;
 231         intel_crtc->lut_g[regno] = green >> 8;
 232         intel_crtc->lut_b[regno] = blue >> 8;
 233 }
 234
 235 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 236                                     u16 *blue, int regno)
 237 {
 238         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 239
 240         *red = intel_crtc->lut_r[regno] << 8;
 241         *green = intel_crtc->lut_g[regno] << 8;
 242         *blue = intel_crtc->lut_b[regno] << 8;
 243 }
 244
 245 static struct drm_fb_helper_crtc *
 246 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 247 {
 248         int i;
 249
 250         for (i = 0; i < fb_helper->crtc_count; i++)
 251                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 252                         return &fb_helper->crtc_info[i];
 253
 254         return NULL;
 255 }
 256
 257 /*
 258  * Try to read the BIOS display configuration and use it for the initial
 259  * fb configuration.
 260  *
 261  * The BIOS or boot loader will generally create an initial display
 262  * configuration for us that includes some set of active pipes and displays.
 263  * This routine tries to figure out which pipes and connectors are active
 264  * and stuffs them into the crtcs and modes array given to us by the
 265  * drm_fb_helper code.
 266  *
 267  * The overall sequence is:
 268  *   intel_fbdev_init - from driver load
 269  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 270  *     drm_fb_helper_init - build fb helper structs
 271  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 272  *   intel_fbdev_initial_config - apply the config
 273  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 274  *         drm_setup_crtcs - build crtc config for fbdev
 275  *           intel_fb_initial_config - find active connectors etc
 276  *         drm_fb_helper_single_fb_probe - set up fbdev
 277  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 278  *
 279  * Note that we don't make special consideration whether we could actually
 280  * switch to the selected modes without a full modeset. E.g. when the display
 281  * is in VGA mode we need to recalculate watermarks and set a new high-res
 282  * framebuffer anyway.
 283  */
 284 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 285                                     struct drm_fb_helper_crtc **crtcs,
 286                                     struct drm_display_mode **modes,
 287                                     bool *enabled, int width, int height)
 288 {
 289         struct drm_device *dev = fb_helper->dev;
 290         int i, j;
 291         bool *save_enabled;
 292         bool fallback = true;
 293
 294         /*
 295          * If the user specified any force options, just bail here
 296          * and use that config.
 297          */
 298         for (i = 0; i < fb_helper->connector_count; i++) {
 299                 struct drm_fb_helper_connector *fb_conn;
 300                 struct drm_connector *connector;
 301
 302                 fb_conn = fb_helper->connector_info[i];
 303                 connector = fb_conn->connector;
 304
 305                 if (!enabled[i])
 306                         continue;
 307
 308                 if (connector->force != DRM_FORCE_UNSPECIFIED)
 309                         return false;
 310         }
 311
 312         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 313                                GFP_KERNEL);
 314         if (!save_enabled)
 315                 return false;
 316
 317         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 318
 319         for (i = 0; i < fb_helper->connector_count; i++) {
 320                 struct drm_fb_helper_connector *fb_conn;
 321                 struct drm_connector *connector;
 322                 struct drm_encoder *encoder;
 323                 struct drm_fb_helper_crtc *new_crtc;
 324
 325                 fb_conn = fb_helper->connector_info[i];
 326                 connector = fb_conn->connector;
 327                 if (!enabled[i]) {
 328                         DRM_DEBUG_KMS("connector %d not enabled, skipping\n",
 329                                       connector->base.id);
 330                         continue;
 331                 }
 332
 333                 encoder = connector->encoder;
 334                 if (!encoder || WARN_ON(!encoder->crtc)) {
 335                         DRM_DEBUG_KMS("connector %d has no encoder or crtc, skipping\n",
 336                                       connector->base.id);
 337                         enabled[i] = false;
 338                         continue;
 339                 }
 340
 341                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 342
 343                 /*
 344                  * Make sure we're not trying to drive multiple connectors
 345                  * with a single CRTC, since our cloning support may not
 346                  * match the BIOS.
 347                  */
 348                 for (j = 0; j < fb_helper->connector_count; j++) {
 349                         if (crtcs[j] == new_crtc) {
 350                                 fallback = true;
 351                                 goto out;
 352                         }
 353                 }
 354
 355                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
 356                               fb_conn->connector->base.id);
 357
 358                 /* go for command line mode first */
 359                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 360
 361                 /* try for preferred next */
 362                 if (!modes[i]) {
 363                         DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
 364                                       fb_conn->connector->base.id);
 365                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 366                                                           height);
 367                 }
 368
 369                 /* last resort: use current mode */
 370                 if (!modes[i]) {
 371                         /*
 372                          * IMPORTANT: We want to use the adjusted mode (i.e.
 373                          * after the panel fitter upscaling) as the initial
 374                          * config, not the input mode, which is what crtc->mode
 375                          * usually contains. But since our current fastboot
 376                          * code puts a mode derived from the post-pfit timings
 377                          * into crtc->mode this works out correctly. We don't
 378                          * use hwmode anywhere right now, so use it for this
 379                          * since the fb helper layer wants a pointer to
 380                          * something we own.
 381                          */
 382                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 383                                                     &to_intel_crtc(encoder->crtc)->config);
 384                         modes[i] = &encoder->crtc->hwmode;
 385                 }
 386                 crtcs[i] = new_crtc;
 387
 388                 DRM_DEBUG_KMS("connector %s on crtc %d: %s\n",
 389                               drm_get_connector_name(connector),
 390                               encoder->crtc->base.id,
 391                               modes[i]->name);
 392
 393                 fallback = false;
 394         }
 395
 396 out:
 397         if (fallback) {
 398                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 399                 kfree(save_enabled);
 400                 return false;
 401         }
 402
 403         kfree(save_enabled);
 404         return true;
 405 }
 406
 407 static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 408         .initial_config = intel_fb_initial_config,
 409         .gamma_set = intel_crtc_fb_gamma_set,
 410         .gamma_get = intel_crtc_fb_gamma_get,
 411         .fb_probe = intelfb_create,
 412 };
 413
 414 static void intel_fbdev_destroy(struct drm_device *dev,
 415                                 struct intel_fbdev *ifbdev)
 416 {
 417         if (ifbdev->helper.fbdev) {
 418                 struct fb_info *info = ifbdev->helper.fbdev;
 419
 420                 unregister_framebuffer(info);
 421                 iounmap(info->screen_base);
 422                 if (info->cmap.len)
 423                         fb_dealloc_cmap(&info->cmap);
 424
 425                 framebuffer_release(info);
 426         }
 427
 428         drm_fb_helper_fini(&ifbdev->helper);
 429
 430         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 431         drm_framebuffer_remove(&ifbdev->fb->base);
 432 }
 433
 434 int intel_fbdev_init(struct drm_device *dev)
 435 {
 436         struct intel_fbdev *ifbdev;
 437         struct drm_i915_private *dev_priv = dev->dev_private;
 438         int ret;
 439
 440         ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
 441         if (!ifbdev)
 442                 return -ENOMEM;
 443
 444         dev_priv->fbdev = ifbdev;
 445         ifbdev->helper.funcs = &intel_fb_helper_funcs;
 446
 447         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 448                                  INTEL_INFO(dev)->num_pipes,
 449                                  4);
 450         if (ret) {
 451                 kfree(ifbdev);
 452                 return ret;
 453         }
 454
 455         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 456
 457         return 0;
 458 }
 459
 460 void intel_fbdev_initial_config(struct drm_device *dev)
 461 {
 462         struct drm_i915_private *dev_priv = dev->dev_private;
 463
 464         /* Due to peculiar init order wrt to hpd handling this is separate. */
 465         drm_fb_helper_initial_config(&dev_priv->fbdev->helper, 32);
 466 }
 467
 468 void intel_fbdev_fini(struct drm_device *dev)
 469 {
 470         struct drm_i915_private *dev_priv = dev->dev_private;
 471         if (!dev_priv->fbdev)
 472                 return;
 473
 474         intel_fbdev_destroy(dev, dev_priv->fbdev);
 475         kfree(dev_priv->fbdev);
 476         dev_priv->fbdev = NULL;
 477 }
 478
 479 void intel_fbdev_set_suspend(struct drm_device *dev, int state)
 480 {
 481         struct drm_i915_private *dev_priv = dev->dev_private;
 482         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 483         struct fb_info *info;
 484
 485         if (!ifbdev)
 486                 return;
 487
 488         info = ifbdev->helper.fbdev;
 489
 490         /* On resume from hibernation: If the object is shmemfs backed, it has
 491          * been restored from swap. If the object is stolen however, it will be
 492          * full of whatever garbage was left in there.
 493          */
 494         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 495                 memset_io(info->screen_base, 0, info->screen_size);
 496
 497         fb_set_suspend(info, state);
 498 }
 499
 500 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 501 {
 502         struct drm_i915_private *dev_priv = dev->dev_private;
 503         drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 504 }
 505
 506 void intel_fbdev_restore_mode(struct drm_device *dev)
 507 {
 508         int ret;
 509         struct drm_i915_private *dev_priv = dev->dev_private;
 510
 511         if (INTEL_INFO(dev)->num_pipes == 0)
 512                 return;
 513
 514         drm_modeset_lock_all(dev);
 515
 516         ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
 517         if (ret)
 518                 DRM_DEBUG("failed to restore crtc mode\n");
 519
 520         drm_modeset_unlock_all(dev);
 521 }