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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/console.h> 33 #include <linux/pci.h> 34 #include <linux/sysrq.h> 35 #include <linux/vga_switcheroo.h> 36 37 #include <drm/drm_atomic.h> 38 #include <drm/drm_drv.h> 39 #include <drm/drm_fb_helper.h> 40 #include <drm/drm_fourcc.h> 41 #include <drm/drm_framebuffer.h> 42 #include <drm/drm_modeset_helper_vtables.h> 43 #include <drm/drm_print.h> 44 #include <drm/drm_vblank.h> 45 46 #include "drm_internal.h" 47 48 static bool drm_fbdev_emulation = true; 49 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); 50 MODULE_PARM_DESC(fbdev_emulation, 51 "Enable legacy fbdev emulation [default=true]"); 52 53 static int drm_fbdev_overalloc = CONFIG_DRM_FBDEV_OVERALLOC; 54 module_param(drm_fbdev_overalloc, int, 0444); 55 MODULE_PARM_DESC(drm_fbdev_overalloc, 56 "Overallocation of the fbdev buffer (%) [default=" 57 __MODULE_STRING(CONFIG_DRM_FBDEV_OVERALLOC) "]"); 58 59 /* 60 * In order to keep user-space compatibility, we want in certain use-cases 61 * to keep leaking the fbdev physical address to the user-space program 62 * handling the fbdev buffer. 63 * 64 * This is a bad habit, essentially kept to support closed-source OpenGL 65 * drivers that should really be moved into open-source upstream projects 66 * instead of using legacy physical addresses in user space to communicate 67 * with other out-of-tree kernel modules. 68 * 69 * This module_param *should* be removed as soon as possible and be 70 * considered as a broken and legacy behaviour from a modern fbdev device. 71 */ 72 static bool drm_leak_fbdev_smem; 73 #if IS_ENABLED(CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM) 74 module_param_unsafe(drm_leak_fbdev_smem, bool, 0600); 75 MODULE_PARM_DESC(drm_leak_fbdev_smem, 76 "Allow unsafe leaking fbdev physical smem address [default=false]"); 77 #endif 78 79 static LIST_HEAD(kernel_fb_helper_list); 80 static DEFINE_MUTEX(kernel_fb_helper_lock); 81 82 /** 83 * DOC: fbdev helpers 84 * 85 * The fb helper functions are useful to provide an fbdev on top of a drm kernel 86 * mode setting driver. They can be used mostly independently from the crtc 87 * helper functions used by many drivers to implement the kernel mode setting 88 * interfaces. 89 * 90 * Drivers that support a dumb buffer with a virtual address and mmap support, 91 * should try out the generic fbdev emulation using drm_fbdev_generic_setup(). 92 * It will automatically set up deferred I/O if the driver requires a shadow 93 * buffer. 94 * 95 * Existing fbdev implementations should restore the fbdev console by using 96 * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback. 97 * They should also notify the fb helper code from updates to the output 98 * configuration by using drm_fb_helper_output_poll_changed() as their 99 * &drm_mode_config_funcs.output_poll_changed callback. New implementations 100 * of fbdev should be build on top of struct &drm_client_funcs, which handles 101 * this automatically. Setting the old callbacks should be avoided. 102 * 103 * For suspend/resume consider using drm_mode_config_helper_suspend() and 104 * drm_mode_config_helper_resume() which takes care of fbdev as well. 105 * 106 * All other functions exported by the fb helper library can be used to 107 * implement the fbdev driver interface by the driver. 108 * 109 * It is possible, though perhaps somewhat tricky, to implement race-free 110 * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() 111 * helper must be called first to initialize the minimum required to make 112 * hotplug detection work. Drivers also need to make sure to properly set up 113 * the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init() 114 * it is safe to enable interrupts and start processing hotplug events. At the 115 * same time, drivers should initialize all modeset objects such as CRTCs, 116 * encoders and connectors. To finish up the fbdev helper initialization, the 117 * drm_fb_helper_init() function is called. To probe for all attached displays 118 * and set up an initial configuration using the detected hardware, drivers 119 * should call drm_fb_helper_initial_config(). 120 * 121 * If &drm_framebuffer_funcs.dirty is set, the 122 * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will 123 * accumulate changes and schedule &drm_fb_helper.dirty_work to run right 124 * away. This worker then calls the dirty() function ensuring that it will 125 * always run in process context since the fb_*() function could be running in 126 * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io 127 * callback it will also schedule dirty_work with the damage collected from the 128 * mmap page writes. 129 * 130 * Deferred I/O is not compatible with SHMEM. Such drivers should request an 131 * fbdev shadow buffer and call drm_fbdev_generic_setup() instead. 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 if (crtc->funcs->gamma_set == NULL) 139 return; 140 141 r_base = crtc->gamma_store; 142 g_base = r_base + crtc->gamma_size; 143 b_base = g_base + crtc->gamma_size; 144 145 crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 146 crtc->gamma_size, NULL); 147 } 148 149 /** 150 * drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter 151 * @info: fbdev registered by the helper 152 */ 153 int drm_fb_helper_debug_enter(struct fb_info *info) 154 { 155 struct drm_fb_helper *helper = info->par; 156 const struct drm_crtc_helper_funcs *funcs; 157 struct drm_mode_set *mode_set; 158 159 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 160 mutex_lock(&helper->client.modeset_mutex); 161 drm_client_for_each_modeset(mode_set, &helper->client) { 162 if (!mode_set->crtc->enabled) 163 continue; 164 165 funcs = mode_set->crtc->helper_private; 166 if (funcs->mode_set_base_atomic == NULL) 167 continue; 168 169 if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev)) 170 continue; 171 172 funcs->mode_set_base_atomic(mode_set->crtc, 173 mode_set->fb, 174 mode_set->x, 175 mode_set->y, 176 ENTER_ATOMIC_MODE_SET); 177 } 178 mutex_unlock(&helper->client.modeset_mutex); 179 } 180 181 return 0; 182 } 183 EXPORT_SYMBOL(drm_fb_helper_debug_enter); 184 185 /** 186 * drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave 187 * @info: fbdev registered by the helper 188 */ 189 int drm_fb_helper_debug_leave(struct fb_info *info) 190 { 191 struct drm_fb_helper *helper = info->par; 192 struct drm_client_dev *client = &helper->client; 193 struct drm_device *dev = helper->dev; 194 struct drm_crtc *crtc; 195 const struct drm_crtc_helper_funcs *funcs; 196 struct drm_mode_set *mode_set; 197 struct drm_framebuffer *fb; 198 199 mutex_lock(&client->modeset_mutex); 200 drm_client_for_each_modeset(mode_set, client) { 201 crtc = mode_set->crtc; 202 if (drm_drv_uses_atomic_modeset(crtc->dev)) 203 continue; 204 205 funcs = crtc->helper_private; 206 fb = crtc->primary->fb; 207 208 if (!crtc->enabled) 209 continue; 210 211 if (!fb) { 212 drm_err(dev, "no fb to restore?\n"); 213 continue; 214 } 215 216 if (funcs->mode_set_base_atomic == NULL) 217 continue; 218 219 drm_fb_helper_restore_lut_atomic(mode_set->crtc); 220 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, 221 crtc->y, LEAVE_ATOMIC_MODE_SET); 222 } 223 mutex_unlock(&client->modeset_mutex); 224 225 return 0; 226 } 227 EXPORT_SYMBOL(drm_fb_helper_debug_leave); 228 229 static int 230 __drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper, 231 bool force) 232 { 233 bool do_delayed; 234 int ret; 235 236 if (!drm_fbdev_emulation || !fb_helper) 237 return -ENODEV; 238 239 if (READ_ONCE(fb_helper->deferred_setup)) 240 return 0; 241 242 mutex_lock(&fb_helper->lock); 243 if (force) { 244 /* 245 * Yes this is the _locked version which expects the master lock 246 * to be held. But for forced restores we're intentionally 247 * racing here, see drm_fb_helper_set_par(). 248 */ 249 ret = drm_client_modeset_commit_locked(&fb_helper->client); 250 } else { 251 ret = drm_client_modeset_commit(&fb_helper->client); 252 } 253 254 do_delayed = fb_helper->delayed_hotplug; 255 if (do_delayed) 256 fb_helper->delayed_hotplug = false; 257 mutex_unlock(&fb_helper->lock); 258 259 if (do_delayed) 260 drm_fb_helper_hotplug_event(fb_helper); 261 262 return ret; 263 } 264 265 /** 266 * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration 267 * @fb_helper: driver-allocated fbdev helper, can be NULL 268 * 269 * This should be called from driver's drm &drm_driver.lastclose callback 270 * when implementing an fbcon on top of kms using this helper. This ensures that 271 * the user isn't greeted with a black screen when e.g. X dies. 272 * 273 * RETURNS: 274 * Zero if everything went ok, negative error code otherwise. 275 */ 276 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 277 { 278 return __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, false); 279 } 280 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); 281 282 #ifdef CONFIG_MAGIC_SYSRQ 283 /* emergency restore, don't bother with error reporting */ 284 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) 285 { 286 struct drm_fb_helper *helper; 287 288 mutex_lock(&kernel_fb_helper_lock); 289 list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { 290 struct drm_device *dev = helper->dev; 291 292 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) 293 continue; 294 295 mutex_lock(&helper->lock); 296 drm_client_modeset_commit_locked(&helper->client); 297 mutex_unlock(&helper->lock); 298 } 299 mutex_unlock(&kernel_fb_helper_lock); 300 } 301 302 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); 303 304 static void drm_fb_helper_sysrq(u8 dummy1) 305 { 306 schedule_work(&drm_fb_helper_restore_work); 307 } 308 309 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { 310 .handler = drm_fb_helper_sysrq, 311 .help_msg = "force-fb(v)", 312 .action_msg = "Restore framebuffer console", 313 }; 314 #else 315 static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; 316 #endif 317 318 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) 319 { 320 struct drm_fb_helper *fb_helper = info->par; 321 322 mutex_lock(&fb_helper->lock); 323 drm_client_modeset_dpms(&fb_helper->client, dpms_mode); 324 mutex_unlock(&fb_helper->lock); 325 } 326 327 /** 328 * drm_fb_helper_blank - implementation for &fb_ops.fb_blank 329 * @blank: desired blanking state 330 * @info: fbdev registered by the helper 331 */ 332 int drm_fb_helper_blank(int blank, struct fb_info *info) 333 { 334 if (oops_in_progress) 335 return -EBUSY; 336 337 switch (blank) { 338 /* Display: On; HSync: On, VSync: On */ 339 case FB_BLANK_UNBLANK: 340 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); 341 break; 342 /* Display: Off; HSync: On, VSync: On */ 343 case FB_BLANK_NORMAL: 344 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 345 break; 346 /* Display: Off; HSync: Off, VSync: On */ 347 case FB_BLANK_HSYNC_SUSPEND: 348 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); 349 break; 350 /* Display: Off; HSync: On, VSync: Off */ 351 case FB_BLANK_VSYNC_SUSPEND: 352 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); 353 break; 354 /* Display: Off; HSync: Off, VSync: Off */ 355 case FB_BLANK_POWERDOWN: 356 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); 357 break; 358 } 359 return 0; 360 } 361 EXPORT_SYMBOL(drm_fb_helper_blank); 362 363 static void drm_fb_helper_resume_worker(struct work_struct *work) 364 { 365 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, 366 resume_work); 367 368 console_lock(); 369 fb_set_suspend(helper->info, 0); 370 console_unlock(); 371 } 372 373 static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper) 374 { 375 struct drm_device *dev = helper->dev; 376 struct drm_clip_rect *clip = &helper->damage_clip; 377 struct drm_clip_rect clip_copy; 378 unsigned long flags; 379 int ret; 380 381 if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty)) 382 return; 383 384 spin_lock_irqsave(&helper->damage_lock, flags); 385 clip_copy = *clip; 386 clip->x1 = clip->y1 = ~0; 387 clip->x2 = clip->y2 = 0; 388 spin_unlock_irqrestore(&helper->damage_lock, flags); 389 390 ret = helper->funcs->fb_dirty(helper, &clip_copy); 391 if (ret) 392 goto err; 393 394 return; 395 396 err: 397 /* 398 * Restore damage clip rectangle on errors. The next run 399 * of the damage worker will perform the update. 400 */ 401 spin_lock_irqsave(&helper->damage_lock, flags); 402 clip->x1 = min_t(u32, clip->x1, clip_copy.x1); 403 clip->y1 = min_t(u32, clip->y1, clip_copy.y1); 404 clip->x2 = max_t(u32, clip->x2, clip_copy.x2); 405 clip->y2 = max_t(u32, clip->y2, clip_copy.y2); 406 spin_unlock_irqrestore(&helper->damage_lock, flags); 407 } 408 409 static void drm_fb_helper_damage_work(struct work_struct *work) 410 { 411 struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work); 412 413 drm_fb_helper_fb_dirty(helper); 414 } 415 416 /** 417 * drm_fb_helper_prepare - setup a drm_fb_helper structure 418 * @dev: DRM device 419 * @helper: driver-allocated fbdev helper structure to set up 420 * @preferred_bpp: Preferred bits per pixel for the device. 421 * @funcs: pointer to structure of functions associate with this helper 422 * 423 * Sets up the bare minimum to make the framebuffer helper usable. This is 424 * useful to implement race-free initialization of the polling helpers. 425 */ 426 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 427 unsigned int preferred_bpp, 428 const struct drm_fb_helper_funcs *funcs) 429 { 430 /* 431 * Pick a preferred bpp of 32 if no value has been given. This 432 * will select XRGB8888 for the framebuffer formats. All drivers 433 * have to support XRGB8888 for backwards compatibility with legacy 434 * userspace, so it's the safe choice here. 435 * 436 * TODO: Replace struct drm_mode_config.preferred_depth and this 437 * bpp value with a preferred format that is given as struct 438 * drm_format_info. Then derive all other values from the 439 * format. 440 */ 441 if (!preferred_bpp) 442 preferred_bpp = 32; 443 444 INIT_LIST_HEAD(&helper->kernel_fb_list); 445 spin_lock_init(&helper->damage_lock); 446 INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); 447 INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work); 448 helper->damage_clip.x1 = helper->damage_clip.y1 = ~0; 449 mutex_init(&helper->lock); 450 helper->funcs = funcs; 451 helper->dev = dev; 452 helper->preferred_bpp = preferred_bpp; 453 } 454 EXPORT_SYMBOL(drm_fb_helper_prepare); 455 456 /** 457 * drm_fb_helper_unprepare - clean up a drm_fb_helper structure 458 * @fb_helper: driver-allocated fbdev helper structure to set up 459 * 460 * Cleans up the framebuffer helper. Inverse of drm_fb_helper_prepare(). 461 */ 462 void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper) 463 { 464 mutex_destroy(&fb_helper->lock); 465 } 466 EXPORT_SYMBOL(drm_fb_helper_unprepare); 467 468 /** 469 * drm_fb_helper_init - initialize a &struct drm_fb_helper 470 * @dev: drm device 471 * @fb_helper: driver-allocated fbdev helper structure to initialize 472 * 473 * This allocates the structures for the fbdev helper with the given limits. 474 * Note that this won't yet touch the hardware (through the driver interfaces) 475 * nor register the fbdev. This is only done in drm_fb_helper_initial_config() 476 * to allow driver writes more control over the exact init sequence. 477 * 478 * Drivers must call drm_fb_helper_prepare() before calling this function. 479 * 480 * RETURNS: 481 * Zero if everything went ok, nonzero otherwise. 482 */ 483 int drm_fb_helper_init(struct drm_device *dev, 484 struct drm_fb_helper *fb_helper) 485 { 486 int ret; 487 488 /* 489 * If this is not the generic fbdev client, initialize a drm_client 490 * without callbacks so we can use the modesets. 491 */ 492 if (!fb_helper->client.funcs) { 493 ret = drm_client_init(dev, &fb_helper->client, "drm_fb_helper", NULL); 494 if (ret) 495 return ret; 496 } 497 498 dev->fb_helper = fb_helper; 499 500 return 0; 501 } 502 EXPORT_SYMBOL(drm_fb_helper_init); 503 504 /** 505 * drm_fb_helper_alloc_info - allocate fb_info and some of its members 506 * @fb_helper: driver-allocated fbdev helper 507 * 508 * A helper to alloc fb_info and the member cmap. Called by the driver 509 * within the fb_probe fb_helper callback function. Drivers do not 510 * need to release the allocated fb_info structure themselves, this is 511 * automatically done when calling drm_fb_helper_fini(). 512 * 513 * RETURNS: 514 * fb_info pointer if things went okay, pointer containing error code 515 * otherwise 516 */ 517 struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper) 518 { 519 struct device *dev = fb_helper->dev->dev; 520 struct fb_info *info; 521 int ret; 522 523 info = framebuffer_alloc(0, dev); 524 if (!info) 525 return ERR_PTR(-ENOMEM); 526 527 ret = fb_alloc_cmap(&info->cmap, 256, 0); 528 if (ret) 529 goto err_release; 530 531 fb_helper->info = info; 532 info->skip_vt_switch = true; 533 534 return info; 535 536 err_release: 537 framebuffer_release(info); 538 return ERR_PTR(ret); 539 } 540 EXPORT_SYMBOL(drm_fb_helper_alloc_info); 541 542 /** 543 * drm_fb_helper_release_info - release fb_info and its members 544 * @fb_helper: driver-allocated fbdev helper 545 * 546 * A helper to release fb_info and the member cmap. Drivers do not 547 * need to release the allocated fb_info structure themselves, this is 548 * automatically done when calling drm_fb_helper_fini(). 549 */ 550 void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper) 551 { 552 struct fb_info *info = fb_helper->info; 553 554 if (!info) 555 return; 556 557 fb_helper->info = NULL; 558 559 if (info->cmap.len) 560 fb_dealloc_cmap(&info->cmap); 561 framebuffer_release(info); 562 } 563 EXPORT_SYMBOL(drm_fb_helper_release_info); 564 565 /** 566 * drm_fb_helper_unregister_info - unregister fb_info framebuffer device 567 * @fb_helper: driver-allocated fbdev helper, can be NULL 568 * 569 * A wrapper around unregister_framebuffer, to release the fb_info 570 * framebuffer device. This must be called before releasing all resources for 571 * @fb_helper by calling drm_fb_helper_fini(). 572 */ 573 void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper) 574 { 575 if (fb_helper && fb_helper->info) 576 unregister_framebuffer(fb_helper->info); 577 } 578 EXPORT_SYMBOL(drm_fb_helper_unregister_info); 579 580 /** 581 * drm_fb_helper_fini - finialize a &struct drm_fb_helper 582 * @fb_helper: driver-allocated fbdev helper, can be NULL 583 * 584 * This cleans up all remaining resources associated with @fb_helper. 585 */ 586 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) 587 { 588 if (!fb_helper) 589 return; 590 591 fb_helper->dev->fb_helper = NULL; 592 593 if (!drm_fbdev_emulation) 594 return; 595 596 cancel_work_sync(&fb_helper->resume_work); 597 cancel_work_sync(&fb_helper->damage_work); 598 599 drm_fb_helper_release_info(fb_helper); 600 601 mutex_lock(&kernel_fb_helper_lock); 602 if (!list_empty(&fb_helper->kernel_fb_list)) { 603 list_del(&fb_helper->kernel_fb_list); 604 if (list_empty(&kernel_fb_helper_list)) 605 unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 606 } 607 mutex_unlock(&kernel_fb_helper_lock); 608 609 if (!fb_helper->client.funcs) 610 drm_client_release(&fb_helper->client); 611 } 612 EXPORT_SYMBOL(drm_fb_helper_fini); 613 614 static void drm_fb_helper_add_damage_clip(struct drm_fb_helper *helper, u32 x, u32 y, 615 u32 width, u32 height) 616 { 617 struct drm_clip_rect *clip = &helper->damage_clip; 618 unsigned long flags; 619 620 spin_lock_irqsave(&helper->damage_lock, flags); 621 clip->x1 = min_t(u32, clip->x1, x); 622 clip->y1 = min_t(u32, clip->y1, y); 623 clip->x2 = max_t(u32, clip->x2, x + width); 624 clip->y2 = max_t(u32, clip->y2, y + height); 625 spin_unlock_irqrestore(&helper->damage_lock, flags); 626 } 627 628 static void drm_fb_helper_damage(struct drm_fb_helper *helper, u32 x, u32 y, 629 u32 width, u32 height) 630 { 631 drm_fb_helper_add_damage_clip(helper, x, y, width, height); 632 633 schedule_work(&helper->damage_work); 634 } 635 636 /* 637 * Convert memory region into area of scanlines and pixels per 638 * scanline. The parameters off and len must not reach beyond 639 * the end of the framebuffer. 640 */ 641 static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, size_t len, 642 struct drm_rect *clip) 643 { 644 u32 line_length = info->fix.line_length; 645 u32 fb_height = info->var.yres; 646 off_t end = off + len; 647 u32 x1 = 0; 648 u32 y1 = off / line_length; 649 u32 x2 = info->var.xres; 650 u32 y2 = DIV_ROUND_UP(end, line_length); 651 652 /* Don't allow any of them beyond the bottom bound of display area */ 653 if (y1 > fb_height) 654 y1 = fb_height; 655 if (y2 > fb_height) 656 y2 = fb_height; 657 658 if ((y2 - y1) == 1) { 659 /* 660 * We've only written to a single scanline. Try to reduce 661 * the number of horizontal pixels that need an update. 662 */ 663 off_t bit_off = (off % line_length) * 8; 664 off_t bit_end = (end % line_length) * 8; 665 666 x1 = bit_off / info->var.bits_per_pixel; 667 x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel); 668 } 669 670 drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1); 671 } 672 673 /* Don't use in new code. */ 674 void drm_fb_helper_damage_range(struct fb_info *info, off_t off, size_t len) 675 { 676 struct drm_fb_helper *fb_helper = info->par; 677 struct drm_rect damage_area; 678 679 drm_fb_helper_memory_range_to_clip(info, off, len, &damage_area); 680 drm_fb_helper_damage(fb_helper, damage_area.x1, damage_area.y1, 681 drm_rect_width(&damage_area), 682 drm_rect_height(&damage_area)); 683 } 684 EXPORT_SYMBOL(drm_fb_helper_damage_range); 685 686 /* Don't use in new code. */ 687 void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height) 688 { 689 struct drm_fb_helper *fb_helper = info->par; 690 691 drm_fb_helper_damage(fb_helper, x, y, width, height); 692 } 693 EXPORT_SYMBOL(drm_fb_helper_damage_area); 694 695 /** 696 * drm_fb_helper_deferred_io() - fbdev deferred_io callback function 697 * @info: fb_info struct pointer 698 * @pagereflist: list of mmap framebuffer pages that have to be flushed 699 * 700 * This function is used as the &fb_deferred_io.deferred_io 701 * callback function for flushing the fbdev mmap writes. 702 */ 703 void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist) 704 { 705 struct drm_fb_helper *helper = info->par; 706 unsigned long start, end, min_off, max_off, total_size; 707 struct fb_deferred_io_pageref *pageref; 708 struct drm_rect damage_area; 709 710 min_off = ULONG_MAX; 711 max_off = 0; 712 list_for_each_entry(pageref, pagereflist, list) { 713 start = pageref->offset; 714 end = start + PAGE_SIZE; 715 min_off = min(min_off, start); 716 max_off = max(max_off, end); 717 } 718 719 /* 720 * As we can only track pages, we might reach beyond the end 721 * of the screen and account for non-existing scanlines. Hence, 722 * keep the covered memory area within the screen buffer. 723 */ 724 if (info->screen_size) 725 total_size = info->screen_size; 726 else 727 total_size = info->fix.smem_len; 728 max_off = min(max_off, total_size); 729 730 if (min_off < max_off) { 731 drm_fb_helper_memory_range_to_clip(info, min_off, max_off - min_off, &damage_area); 732 drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1, 733 drm_rect_width(&damage_area), 734 drm_rect_height(&damage_area)); 735 } 736 } 737 EXPORT_SYMBOL(drm_fb_helper_deferred_io); 738 739 /** 740 * drm_fb_helper_set_suspend - wrapper around fb_set_suspend 741 * @fb_helper: driver-allocated fbdev helper, can be NULL 742 * @suspend: whether to suspend or resume 743 * 744 * A wrapper around fb_set_suspend implemented by fbdev core. 745 * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take 746 * the lock yourself 747 */ 748 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) 749 { 750 if (fb_helper && fb_helper->info) 751 fb_set_suspend(fb_helper->info, suspend); 752 } 753 EXPORT_SYMBOL(drm_fb_helper_set_suspend); 754 755 /** 756 * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also 757 * takes the console lock 758 * @fb_helper: driver-allocated fbdev helper, can be NULL 759 * @suspend: whether to suspend or resume 760 * 761 * A wrapper around fb_set_suspend() that takes the console lock. If the lock 762 * isn't available on resume, a worker is tasked with waiting for the lock 763 * to become available. The console lock can be pretty contented on resume 764 * due to all the printk activity. 765 * 766 * This function can be called multiple times with the same state since 767 * &fb_info.state is checked to see if fbdev is running or not before locking. 768 * 769 * Use drm_fb_helper_set_suspend() if you need to take the lock yourself. 770 */ 771 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, 772 bool suspend) 773 { 774 if (!fb_helper || !fb_helper->info) 775 return; 776 777 /* make sure there's no pending/ongoing resume */ 778 flush_work(&fb_helper->resume_work); 779 780 if (suspend) { 781 if (fb_helper->info->state != FBINFO_STATE_RUNNING) 782 return; 783 784 console_lock(); 785 786 } else { 787 if (fb_helper->info->state == FBINFO_STATE_RUNNING) 788 return; 789 790 if (!console_trylock()) { 791 schedule_work(&fb_helper->resume_work); 792 return; 793 } 794 } 795 796 fb_set_suspend(fb_helper->info, suspend); 797 console_unlock(); 798 } 799 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked); 800 801 static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info) 802 { 803 u32 *palette = (u32 *)info->pseudo_palette; 804 int i; 805 806 if (cmap->start + cmap->len > 16) 807 return -EINVAL; 808 809 for (i = 0; i < cmap->len; ++i) { 810 u16 red = cmap->red[i]; 811 u16 green = cmap->green[i]; 812 u16 blue = cmap->blue[i]; 813 u32 value; 814 815 red >>= 16 - info->var.red.length; 816 green >>= 16 - info->var.green.length; 817 blue >>= 16 - info->var.blue.length; 818 value = (red << info->var.red.offset) | 819 (green << info->var.green.offset) | 820 (blue << info->var.blue.offset); 821 if (info->var.transp.length > 0) { 822 u32 mask = (1 << info->var.transp.length) - 1; 823 824 mask <<= info->var.transp.offset; 825 value |= mask; 826 } 827 palette[cmap->start + i] = value; 828 } 829 830 return 0; 831 } 832 833 static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info) 834 { 835 struct drm_fb_helper *fb_helper = info->par; 836 struct drm_mode_set *modeset; 837 struct drm_crtc *crtc; 838 u16 *r, *g, *b; 839 int ret = 0; 840 841 drm_modeset_lock_all(fb_helper->dev); 842 drm_client_for_each_modeset(modeset, &fb_helper->client) { 843 crtc = modeset->crtc; 844 if (!crtc->funcs->gamma_set || !crtc->gamma_size) { 845 ret = -EINVAL; 846 goto out; 847 } 848 849 if (cmap->start + cmap->len > crtc->gamma_size) { 850 ret = -EINVAL; 851 goto out; 852 } 853 854 r = crtc->gamma_store; 855 g = r + crtc->gamma_size; 856 b = g + crtc->gamma_size; 857 858 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); 859 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); 860 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); 861 862 ret = crtc->funcs->gamma_set(crtc, r, g, b, 863 crtc->gamma_size, NULL); 864 if (ret) 865 goto out; 866 } 867 out: 868 drm_modeset_unlock_all(fb_helper->dev); 869 870 return ret; 871 } 872 873 static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc, 874 struct fb_cmap *cmap) 875 { 876 struct drm_device *dev = crtc->dev; 877 struct drm_property_blob *gamma_lut; 878 struct drm_color_lut *lut; 879 int size = crtc->gamma_size; 880 int i; 881 882 if (!size || cmap->start + cmap->len > size) 883 return ERR_PTR(-EINVAL); 884 885 gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL); 886 if (IS_ERR(gamma_lut)) 887 return gamma_lut; 888 889 lut = gamma_lut->data; 890 if (cmap->start || cmap->len != size) { 891 u16 *r = crtc->gamma_store; 892 u16 *g = r + crtc->gamma_size; 893 u16 *b = g + crtc->gamma_size; 894 895 for (i = 0; i < cmap->start; i++) { 896 lut[i].red = r[i]; 897 lut[i].green = g[i]; 898 lut[i].blue = b[i]; 899 } 900 for (i = cmap->start + cmap->len; i < size; i++) { 901 lut[i].red = r[i]; 902 lut[i].green = g[i]; 903 lut[i].blue = b[i]; 904 } 905 } 906 907 for (i = 0; i < cmap->len; i++) { 908 lut[cmap->start + i].red = cmap->red[i]; 909 lut[cmap->start + i].green = cmap->green[i]; 910 lut[cmap->start + i].blue = cmap->blue[i]; 911 } 912 913 return gamma_lut; 914 } 915 916 static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info) 917 { 918 struct drm_fb_helper *fb_helper = info->par; 919 struct drm_device *dev = fb_helper->dev; 920 struct drm_property_blob *gamma_lut = NULL; 921 struct drm_modeset_acquire_ctx ctx; 922 struct drm_crtc_state *crtc_state; 923 struct drm_atomic_state *state; 924 struct drm_mode_set *modeset; 925 struct drm_crtc *crtc; 926 u16 *r, *g, *b; 927 bool replaced; 928 int ret = 0; 929 930 drm_modeset_acquire_init(&ctx, 0); 931 932 state = drm_atomic_state_alloc(dev); 933 if (!state) { 934 ret = -ENOMEM; 935 goto out_ctx; 936 } 937 938 state->acquire_ctx = &ctx; 939 retry: 940 drm_client_for_each_modeset(modeset, &fb_helper->client) { 941 crtc = modeset->crtc; 942 943 if (!gamma_lut) 944 gamma_lut = setcmap_new_gamma_lut(crtc, cmap); 945 if (IS_ERR(gamma_lut)) { 946 ret = PTR_ERR(gamma_lut); 947 gamma_lut = NULL; 948 goto out_state; 949 } 950 951 crtc_state = drm_atomic_get_crtc_state(state, crtc); 952 if (IS_ERR(crtc_state)) { 953 ret = PTR_ERR(crtc_state); 954 goto out_state; 955 } 956 957 /* 958 * FIXME: This always uses gamma_lut. Some HW have only 959 * degamma_lut, in which case we should reset gamma_lut and set 960 * degamma_lut. See drm_crtc_legacy_gamma_set(). 961 */ 962 replaced = drm_property_replace_blob(&crtc_state->degamma_lut, 963 NULL); 964 replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL); 965 replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, 966 gamma_lut); 967 crtc_state->color_mgmt_changed |= replaced; 968 } 969 970 ret = drm_atomic_commit(state); 971 if (ret) 972 goto out_state; 973 974 drm_client_for_each_modeset(modeset, &fb_helper->client) { 975 crtc = modeset->crtc; 976 977 r = crtc->gamma_store; 978 g = r + crtc->gamma_size; 979 b = g + crtc->gamma_size; 980 981 memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r)); 982 memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g)); 983 memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b)); 984 } 985 986 out_state: 987 if (ret == -EDEADLK) 988 goto backoff; 989 990 drm_property_blob_put(gamma_lut); 991 drm_atomic_state_put(state); 992 out_ctx: 993 drm_modeset_drop_locks(&ctx); 994 drm_modeset_acquire_fini(&ctx); 995 996 return ret; 997 998 backoff: 999 drm_atomic_state_clear(state); 1000 drm_modeset_backoff(&ctx); 1001 goto retry; 1002 } 1003 1004 /** 1005 * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap 1006 * @cmap: cmap to set 1007 * @info: fbdev registered by the helper 1008 */ 1009 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) 1010 { 1011 struct drm_fb_helper *fb_helper = info->par; 1012 struct drm_device *dev = fb_helper->dev; 1013 int ret; 1014 1015 if (oops_in_progress) 1016 return -EBUSY; 1017 1018 mutex_lock(&fb_helper->lock); 1019 1020 if (!drm_master_internal_acquire(dev)) { 1021 ret = -EBUSY; 1022 goto unlock; 1023 } 1024 1025 mutex_lock(&fb_helper->client.modeset_mutex); 1026 if (info->fix.visual == FB_VISUAL_TRUECOLOR) 1027 ret = setcmap_pseudo_palette(cmap, info); 1028 else if (drm_drv_uses_atomic_modeset(fb_helper->dev)) 1029 ret = setcmap_atomic(cmap, info); 1030 else 1031 ret = setcmap_legacy(cmap, info); 1032 mutex_unlock(&fb_helper->client.modeset_mutex); 1033 1034 drm_master_internal_release(dev); 1035 unlock: 1036 mutex_unlock(&fb_helper->lock); 1037 1038 return ret; 1039 } 1040 EXPORT_SYMBOL(drm_fb_helper_setcmap); 1041 1042 /** 1043 * drm_fb_helper_ioctl - legacy ioctl implementation 1044 * @info: fbdev registered by the helper 1045 * @cmd: ioctl command 1046 * @arg: ioctl argument 1047 * 1048 * A helper to implement the standard fbdev ioctl. Only 1049 * FBIO_WAITFORVSYNC is implemented for now. 1050 */ 1051 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 1052 unsigned long arg) 1053 { 1054 struct drm_fb_helper *fb_helper = info->par; 1055 struct drm_device *dev = fb_helper->dev; 1056 struct drm_crtc *crtc; 1057 int ret = 0; 1058 1059 mutex_lock(&fb_helper->lock); 1060 if (!drm_master_internal_acquire(dev)) { 1061 ret = -EBUSY; 1062 goto unlock; 1063 } 1064 1065 switch (cmd) { 1066 case FBIO_WAITFORVSYNC: 1067 /* 1068 * Only consider the first CRTC. 1069 * 1070 * This ioctl is supposed to take the CRTC number as 1071 * an argument, but in fbdev times, what that number 1072 * was supposed to be was quite unclear, different 1073 * drivers were passing that argument differently 1074 * (some by reference, some by value), and most of the 1075 * userspace applications were just hardcoding 0 as an 1076 * argument. 1077 * 1078 * The first CRTC should be the integrated panel on 1079 * most drivers, so this is the best choice we can 1080 * make. If we're not smart enough here, one should 1081 * just consider switch the userspace to KMS. 1082 */ 1083 crtc = fb_helper->client.modesets[0].crtc; 1084 1085 /* 1086 * Only wait for a vblank event if the CRTC is 1087 * enabled, otherwise just don't do anythintg, 1088 * not even report an error. 1089 */ 1090 ret = drm_crtc_vblank_get(crtc); 1091 if (!ret) { 1092 drm_crtc_wait_one_vblank(crtc); 1093 drm_crtc_vblank_put(crtc); 1094 } 1095 1096 ret = 0; 1097 break; 1098 default: 1099 ret = -ENOTTY; 1100 } 1101 1102 drm_master_internal_release(dev); 1103 unlock: 1104 mutex_unlock(&fb_helper->lock); 1105 return ret; 1106 } 1107 EXPORT_SYMBOL(drm_fb_helper_ioctl); 1108 1109 static bool drm_fb_pixel_format_equal(const struct fb_var_screeninfo *var_1, 1110 const struct fb_var_screeninfo *var_2) 1111 { 1112 return var_1->bits_per_pixel == var_2->bits_per_pixel && 1113 var_1->grayscale == var_2->grayscale && 1114 var_1->red.offset == var_2->red.offset && 1115 var_1->red.length == var_2->red.length && 1116 var_1->red.msb_right == var_2->red.msb_right && 1117 var_1->green.offset == var_2->green.offset && 1118 var_1->green.length == var_2->green.length && 1119 var_1->green.msb_right == var_2->green.msb_right && 1120 var_1->blue.offset == var_2->blue.offset && 1121 var_1->blue.length == var_2->blue.length && 1122 var_1->blue.msb_right == var_2->blue.msb_right && 1123 var_1->transp.offset == var_2->transp.offset && 1124 var_1->transp.length == var_2->transp.length && 1125 var_1->transp.msb_right == var_2->transp.msb_right; 1126 } 1127 1128 static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var, 1129 const struct drm_format_info *format) 1130 { 1131 u8 depth = format->depth; 1132 1133 if (format->is_color_indexed) { 1134 var->red.offset = 0; 1135 var->green.offset = 0; 1136 var->blue.offset = 0; 1137 var->red.length = depth; 1138 var->green.length = depth; 1139 var->blue.length = depth; 1140 var->transp.offset = 0; 1141 var->transp.length = 0; 1142 return; 1143 } 1144 1145 switch (depth) { 1146 case 15: 1147 var->red.offset = 10; 1148 var->green.offset = 5; 1149 var->blue.offset = 0; 1150 var->red.length = 5; 1151 var->green.length = 5; 1152 var->blue.length = 5; 1153 var->transp.offset = 15; 1154 var->transp.length = 1; 1155 break; 1156 case 16: 1157 var->red.offset = 11; 1158 var->green.offset = 5; 1159 var->blue.offset = 0; 1160 var->red.length = 5; 1161 var->green.length = 6; 1162 var->blue.length = 5; 1163 var->transp.offset = 0; 1164 break; 1165 case 24: 1166 var->red.offset = 16; 1167 var->green.offset = 8; 1168 var->blue.offset = 0; 1169 var->red.length = 8; 1170 var->green.length = 8; 1171 var->blue.length = 8; 1172 var->transp.offset = 0; 1173 var->transp.length = 0; 1174 break; 1175 case 32: 1176 var->red.offset = 16; 1177 var->green.offset = 8; 1178 var->blue.offset = 0; 1179 var->red.length = 8; 1180 var->green.length = 8; 1181 var->blue.length = 8; 1182 var->transp.offset = 24; 1183 var->transp.length = 8; 1184 break; 1185 default: 1186 break; 1187 } 1188 } 1189 1190 static void __fill_var(struct fb_var_screeninfo *var, struct fb_info *info, 1191 struct drm_framebuffer *fb) 1192 { 1193 int i; 1194 1195 var->xres_virtual = fb->width; 1196 var->yres_virtual = fb->height; 1197 var->accel_flags = 0; 1198 var->bits_per_pixel = drm_format_info_bpp(fb->format, 0); 1199 1200 var->height = info->var.height; 1201 var->width = info->var.width; 1202 1203 var->left_margin = var->right_margin = 0; 1204 var->upper_margin = var->lower_margin = 0; 1205 var->hsync_len = var->vsync_len = 0; 1206 var->sync = var->vmode = 0; 1207 var->rotate = 0; 1208 var->colorspace = 0; 1209 for (i = 0; i < 4; i++) 1210 var->reserved[i] = 0; 1211 } 1212 1213 /** 1214 * drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var 1215 * @var: screeninfo to check 1216 * @info: fbdev registered by the helper 1217 */ 1218 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 1219 struct fb_info *info) 1220 { 1221 struct drm_fb_helper *fb_helper = info->par; 1222 struct drm_framebuffer *fb = fb_helper->fb; 1223 const struct drm_format_info *format = fb->format; 1224 struct drm_device *dev = fb_helper->dev; 1225 unsigned int bpp; 1226 1227 if (in_dbg_master()) 1228 return -EINVAL; 1229 1230 if (var->pixclock != 0) { 1231 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel clock, value of pixclock is ignored\n"); 1232 var->pixclock = 0; 1233 } 1234 1235 switch (format->format) { 1236 case DRM_FORMAT_C1: 1237 case DRM_FORMAT_C2: 1238 case DRM_FORMAT_C4: 1239 /* supported format with sub-byte pixels */ 1240 break; 1241 1242 default: 1243 if ((drm_format_info_block_width(format, 0) > 1) || 1244 (drm_format_info_block_height(format, 0) > 1)) 1245 return -EINVAL; 1246 break; 1247 } 1248 1249 /* 1250 * Changes struct fb_var_screeninfo are currently not pushed back 1251 * to KMS, hence fail if different settings are requested. 1252 */ 1253 bpp = drm_format_info_bpp(format, 0); 1254 if (var->bits_per_pixel > bpp || 1255 var->xres > fb->width || var->yres > fb->height || 1256 var->xres_virtual > fb->width || var->yres_virtual > fb->height) { 1257 drm_dbg_kms(dev, "fb requested width/height/bpp can't fit in current fb " 1258 "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", 1259 var->xres, var->yres, var->bits_per_pixel, 1260 var->xres_virtual, var->yres_virtual, 1261 fb->width, fb->height, bpp); 1262 return -EINVAL; 1263 } 1264 1265 __fill_var(var, info, fb); 1266 1267 /* 1268 * fb_pan_display() validates this, but fb_set_par() doesn't and just 1269 * falls over. Note that __fill_var above adjusts y/res_virtual. 1270 */ 1271 if (var->yoffset > var->yres_virtual - var->yres || 1272 var->xoffset > var->xres_virtual - var->xres) 1273 return -EINVAL; 1274 1275 /* We neither support grayscale nor FOURCC (also stored in here). */ 1276 if (var->grayscale > 0) 1277 return -EINVAL; 1278 1279 if (var->nonstd) 1280 return -EINVAL; 1281 1282 /* 1283 * Workaround for SDL 1.2, which is known to be setting all pixel format 1284 * fields values to zero in some cases. We treat this situation as a 1285 * kind of "use some reasonable autodetected values". 1286 */ 1287 if (!var->red.offset && !var->green.offset && 1288 !var->blue.offset && !var->transp.offset && 1289 !var->red.length && !var->green.length && 1290 !var->blue.length && !var->transp.length && 1291 !var->red.msb_right && !var->green.msb_right && 1292 !var->blue.msb_right && !var->transp.msb_right) { 1293 drm_fb_helper_fill_pixel_fmt(var, format); 1294 } 1295 1296 /* 1297 * drm fbdev emulation doesn't support changing the pixel format at all, 1298 * so reject all pixel format changing requests. 1299 */ 1300 if (!drm_fb_pixel_format_equal(var, &info->var)) { 1301 drm_dbg_kms(dev, "fbdev emulation doesn't support changing the pixel format\n"); 1302 return -EINVAL; 1303 } 1304 1305 return 0; 1306 } 1307 EXPORT_SYMBOL(drm_fb_helper_check_var); 1308 1309 /** 1310 * drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par 1311 * @info: fbdev registered by the helper 1312 * 1313 * This will let fbcon do the mode init and is called at initialization time by 1314 * the fbdev core when registering the driver, and later on through the hotplug 1315 * callback. 1316 */ 1317 int drm_fb_helper_set_par(struct fb_info *info) 1318 { 1319 struct drm_fb_helper *fb_helper = info->par; 1320 struct fb_var_screeninfo *var = &info->var; 1321 bool force; 1322 1323 if (oops_in_progress) 1324 return -EBUSY; 1325 1326 /* 1327 * Normally we want to make sure that a kms master takes precedence over 1328 * fbdev, to avoid fbdev flickering and occasionally stealing the 1329 * display status. But Xorg first sets the vt back to text mode using 1330 * the KDSET IOCTL with KD_TEXT, and only after that drops the master 1331 * status when exiting. 1332 * 1333 * In the past this was caught by drm_fb_helper_lastclose(), but on 1334 * modern systems where logind always keeps a drm fd open to orchestrate 1335 * the vt switching, this doesn't work. 1336 * 1337 * To not break the userspace ABI we have this special case here, which 1338 * is only used for the above case. Everything else uses the normal 1339 * commit function, which ensures that we never steal the display from 1340 * an active drm master. 1341 */ 1342 force = var->activate & FB_ACTIVATE_KD_TEXT; 1343 1344 __drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper, force); 1345 1346 return 0; 1347 } 1348 EXPORT_SYMBOL(drm_fb_helper_set_par); 1349 1350 static void pan_set(struct drm_fb_helper *fb_helper, int x, int y) 1351 { 1352 struct drm_mode_set *mode_set; 1353 1354 mutex_lock(&fb_helper->client.modeset_mutex); 1355 drm_client_for_each_modeset(mode_set, &fb_helper->client) { 1356 mode_set->x = x; 1357 mode_set->y = y; 1358 } 1359 mutex_unlock(&fb_helper->client.modeset_mutex); 1360 } 1361 1362 static int pan_display_atomic(struct fb_var_screeninfo *var, 1363 struct fb_info *info) 1364 { 1365 struct drm_fb_helper *fb_helper = info->par; 1366 int ret; 1367 1368 pan_set(fb_helper, var->xoffset, var->yoffset); 1369 1370 ret = drm_client_modeset_commit_locked(&fb_helper->client); 1371 if (!ret) { 1372 info->var.xoffset = var->xoffset; 1373 info->var.yoffset = var->yoffset; 1374 } else 1375 pan_set(fb_helper, info->var.xoffset, info->var.yoffset); 1376 1377 return ret; 1378 } 1379 1380 static int pan_display_legacy(struct fb_var_screeninfo *var, 1381 struct fb_info *info) 1382 { 1383 struct drm_fb_helper *fb_helper = info->par; 1384 struct drm_client_dev *client = &fb_helper->client; 1385 struct drm_mode_set *modeset; 1386 int ret = 0; 1387 1388 mutex_lock(&client->modeset_mutex); 1389 drm_modeset_lock_all(fb_helper->dev); 1390 drm_client_for_each_modeset(modeset, client) { 1391 modeset->x = var->xoffset; 1392 modeset->y = var->yoffset; 1393 1394 if (modeset->num_connectors) { 1395 ret = drm_mode_set_config_internal(modeset); 1396 if (!ret) { 1397 info->var.xoffset = var->xoffset; 1398 info->var.yoffset = var->yoffset; 1399 } 1400 } 1401 } 1402 drm_modeset_unlock_all(fb_helper->dev); 1403 mutex_unlock(&client->modeset_mutex); 1404 1405 return ret; 1406 } 1407 1408 /** 1409 * drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display 1410 * @var: updated screen information 1411 * @info: fbdev registered by the helper 1412 */ 1413 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 1414 struct fb_info *info) 1415 { 1416 struct drm_fb_helper *fb_helper = info->par; 1417 struct drm_device *dev = fb_helper->dev; 1418 int ret; 1419 1420 if (oops_in_progress) 1421 return -EBUSY; 1422 1423 mutex_lock(&fb_helper->lock); 1424 if (!drm_master_internal_acquire(dev)) { 1425 ret = -EBUSY; 1426 goto unlock; 1427 } 1428 1429 if (drm_drv_uses_atomic_modeset(dev)) 1430 ret = pan_display_atomic(var, info); 1431 else 1432 ret = pan_display_legacy(var, info); 1433 1434 drm_master_internal_release(dev); 1435 unlock: 1436 mutex_unlock(&fb_helper->lock); 1437 1438 return ret; 1439 } 1440 EXPORT_SYMBOL(drm_fb_helper_pan_display); 1441 1442 static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats, 1443 size_t format_count, uint32_t bpp, uint32_t depth) 1444 { 1445 struct drm_device *dev = fb_helper->dev; 1446 uint32_t format; 1447 size_t i; 1448 1449 /* 1450 * Do not consider YUV or other complicated formats 1451 * for framebuffers. This means only legacy formats 1452 * are supported (fmt->depth is a legacy field), but 1453 * the framebuffer emulation can only deal with such 1454 * formats, specifically RGB/BGA formats. 1455 */ 1456 format = drm_mode_legacy_fb_format(bpp, depth); 1457 if (!format) 1458 goto err; 1459 1460 for (i = 0; i < format_count; ++i) { 1461 if (formats[i] == format) 1462 return format; 1463 } 1464 1465 err: 1466 /* We found nothing. */ 1467 drm_warn(dev, "bpp/depth value of %u/%u not supported\n", bpp, depth); 1468 1469 return DRM_FORMAT_INVALID; 1470 } 1471 1472 static uint32_t drm_fb_helper_find_color_mode_format(struct drm_fb_helper *fb_helper, 1473 const uint32_t *formats, size_t format_count, 1474 unsigned int color_mode) 1475 { 1476 struct drm_device *dev = fb_helper->dev; 1477 uint32_t bpp, depth; 1478 1479 switch (color_mode) { 1480 case 1: 1481 case 2: 1482 case 4: 1483 case 8: 1484 case 16: 1485 case 24: 1486 bpp = depth = color_mode; 1487 break; 1488 case 15: 1489 bpp = 16; 1490 depth = 15; 1491 break; 1492 case 32: 1493 bpp = 32; 1494 depth = 24; 1495 break; 1496 default: 1497 drm_info(dev, "unsupported color mode of %d\n", color_mode); 1498 return DRM_FORMAT_INVALID; 1499 } 1500 1501 return drm_fb_helper_find_format(fb_helper, formats, format_count, bpp, depth); 1502 } 1503 1504 static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, 1505 struct drm_fb_helper_surface_size *sizes) 1506 { 1507 struct drm_client_dev *client = &fb_helper->client; 1508 struct drm_device *dev = fb_helper->dev; 1509 int crtc_count = 0; 1510 struct drm_connector_list_iter conn_iter; 1511 struct drm_connector *connector; 1512 struct drm_mode_set *mode_set; 1513 uint32_t surface_format = DRM_FORMAT_INVALID; 1514 const struct drm_format_info *info; 1515 1516 memset(sizes, 0, sizeof(*sizes)); 1517 sizes->fb_width = (u32)-1; 1518 sizes->fb_height = (u32)-1; 1519 1520 drm_client_for_each_modeset(mode_set, client) { 1521 struct drm_crtc *crtc = mode_set->crtc; 1522 struct drm_plane *plane = crtc->primary; 1523 1524 drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc)); 1525 1526 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter); 1527 drm_client_for_each_connector_iter(connector, &conn_iter) { 1528 struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode; 1529 1530 if (!cmdline_mode->bpp_specified) 1531 continue; 1532 1533 surface_format = drm_fb_helper_find_color_mode_format(fb_helper, 1534 plane->format_types, 1535 plane->format_count, 1536 cmdline_mode->bpp); 1537 if (surface_format != DRM_FORMAT_INVALID) 1538 break; /* found supported format */ 1539 } 1540 drm_connector_list_iter_end(&conn_iter); 1541 1542 if (surface_format != DRM_FORMAT_INVALID) 1543 break; /* found supported format */ 1544 1545 /* try preferred color mode */ 1546 surface_format = drm_fb_helper_find_color_mode_format(fb_helper, 1547 plane->format_types, 1548 plane->format_count, 1549 fb_helper->preferred_bpp); 1550 if (surface_format != DRM_FORMAT_INVALID) 1551 break; /* found supported format */ 1552 } 1553 1554 if (surface_format == DRM_FORMAT_INVALID) { 1555 /* 1556 * If none of the given color modes works, fall back 1557 * to XRGB8888. Drivers are expected to provide this 1558 * format for compatibility with legacy applications. 1559 */ 1560 drm_warn(dev, "No compatible format found\n"); 1561 surface_format = drm_driver_legacy_fb_format(dev, 32, 24); 1562 } 1563 1564 info = drm_format_info(surface_format); 1565 sizes->surface_bpp = drm_format_info_bpp(info, 0); 1566 sizes->surface_depth = info->depth; 1567 1568 /* first up get a count of crtcs now in use and new min/maxes width/heights */ 1569 crtc_count = 0; 1570 drm_client_for_each_modeset(mode_set, client) { 1571 struct drm_display_mode *desired_mode; 1572 int x, y, j; 1573 /* in case of tile group, are we the last tile vert or horiz? 1574 * If no tile group you are always the last one both vertically 1575 * and horizontally 1576 */ 1577 bool lastv = true, lasth = true; 1578 1579 desired_mode = mode_set->mode; 1580 1581 if (!desired_mode) 1582 continue; 1583 1584 crtc_count++; 1585 1586 x = mode_set->x; 1587 y = mode_set->y; 1588 1589 sizes->surface_width = 1590 max_t(u32, desired_mode->hdisplay + x, sizes->surface_width); 1591 sizes->surface_height = 1592 max_t(u32, desired_mode->vdisplay + y, sizes->surface_height); 1593 1594 for (j = 0; j < mode_set->num_connectors; j++) { 1595 struct drm_connector *connector = mode_set->connectors[j]; 1596 1597 if (connector->has_tile && 1598 desired_mode->hdisplay == connector->tile_h_size && 1599 desired_mode->vdisplay == connector->tile_v_size) { 1600 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); 1601 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); 1602 /* cloning to multiple tiles is just crazy-talk, so: */ 1603 break; 1604 } 1605 } 1606 1607 if (lasth) 1608 sizes->fb_width = min_t(u32, desired_mode->hdisplay + x, sizes->fb_width); 1609 if (lastv) 1610 sizes->fb_height = min_t(u32, desired_mode->vdisplay + y, sizes->fb_height); 1611 } 1612 1613 if (crtc_count == 0 || sizes->fb_width == -1 || sizes->fb_height == -1) { 1614 drm_info(dev, "Cannot find any crtc or sizes\n"); 1615 return -EAGAIN; 1616 } 1617 1618 return 0; 1619 } 1620 1621 static int drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, 1622 struct drm_fb_helper_surface_size *sizes) 1623 { 1624 struct drm_client_dev *client = &fb_helper->client; 1625 struct drm_device *dev = fb_helper->dev; 1626 struct drm_mode_config *config = &dev->mode_config; 1627 int ret; 1628 1629 mutex_lock(&client->modeset_mutex); 1630 ret = __drm_fb_helper_find_sizes(fb_helper, sizes); 1631 mutex_unlock(&client->modeset_mutex); 1632 1633 if (ret) 1634 return ret; 1635 1636 /* Handle our overallocation */ 1637 sizes->surface_height *= drm_fbdev_overalloc; 1638 sizes->surface_height /= 100; 1639 if (sizes->surface_height > config->max_height) { 1640 drm_dbg_kms(dev, "Fbdev over-allocation too large; clamping height to %d\n", 1641 config->max_height); 1642 sizes->surface_height = config->max_height; 1643 } 1644 1645 return 0; 1646 } 1647 1648 /* 1649 * Allocates the backing storage and sets up the fbdev info structure through 1650 * the ->fb_probe callback. 1651 */ 1652 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper) 1653 { 1654 struct drm_client_dev *client = &fb_helper->client; 1655 struct drm_device *dev = fb_helper->dev; 1656 struct drm_fb_helper_surface_size sizes; 1657 int ret; 1658 1659 ret = drm_fb_helper_find_sizes(fb_helper, &sizes); 1660 if (ret) { 1661 /* First time: disable all crtc's.. */ 1662 if (!fb_helper->deferred_setup) 1663 drm_client_modeset_commit(client); 1664 return ret; 1665 } 1666 1667 /* push down into drivers */ 1668 ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); 1669 if (ret < 0) 1670 return ret; 1671 1672 strcpy(fb_helper->fb->comm, "[fbcon]"); 1673 1674 /* Set the fb info for vgaswitcheroo clients. Does nothing otherwise. */ 1675 if (dev_is_pci(dev->dev)) 1676 vga_switcheroo_client_fb_set(to_pci_dev(dev->dev), fb_helper->info); 1677 1678 return 0; 1679 } 1680 1681 static void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 1682 bool is_color_indexed) 1683 { 1684 info->fix.type = FB_TYPE_PACKED_PIXELS; 1685 info->fix.visual = is_color_indexed ? FB_VISUAL_PSEUDOCOLOR 1686 : FB_VISUAL_TRUECOLOR; 1687 info->fix.mmio_start = 0; 1688 info->fix.mmio_len = 0; 1689 info->fix.type_aux = 0; 1690 info->fix.xpanstep = 1; /* doing it in hw */ 1691 info->fix.ypanstep = 1; /* doing it in hw */ 1692 info->fix.ywrapstep = 0; 1693 info->fix.accel = FB_ACCEL_NONE; 1694 1695 info->fix.line_length = pitch; 1696 } 1697 1698 static void drm_fb_helper_fill_var(struct fb_info *info, 1699 struct drm_fb_helper *fb_helper, 1700 uint32_t fb_width, uint32_t fb_height) 1701 { 1702 struct drm_framebuffer *fb = fb_helper->fb; 1703 const struct drm_format_info *format = fb->format; 1704 1705 switch (format->format) { 1706 case DRM_FORMAT_C1: 1707 case DRM_FORMAT_C2: 1708 case DRM_FORMAT_C4: 1709 /* supported format with sub-byte pixels */ 1710 break; 1711 1712 default: 1713 WARN_ON((drm_format_info_block_width(format, 0) > 1) || 1714 (drm_format_info_block_height(format, 0) > 1)); 1715 break; 1716 } 1717 1718 info->pseudo_palette = fb_helper->pseudo_palette; 1719 info->var.xoffset = 0; 1720 info->var.yoffset = 0; 1721 __fill_var(&info->var, info, fb); 1722 info->var.activate = FB_ACTIVATE_NOW; 1723 1724 drm_fb_helper_fill_pixel_fmt(&info->var, format); 1725 1726 info->var.xres = fb_width; 1727 info->var.yres = fb_height; 1728 } 1729 1730 /** 1731 * drm_fb_helper_fill_info - initializes fbdev information 1732 * @info: fbdev instance to set up 1733 * @fb_helper: fb helper instance to use as template 1734 * @sizes: describes fbdev size and scanout surface size 1735 * 1736 * Sets up the variable and fixed fbdev metainformation from the given fb helper 1737 * instance and the drm framebuffer allocated in &drm_fb_helper.fb. 1738 * 1739 * Drivers should call this (or their equivalent setup code) from their 1740 * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev 1741 * backing storage framebuffer. 1742 */ 1743 void drm_fb_helper_fill_info(struct fb_info *info, 1744 struct drm_fb_helper *fb_helper, 1745 struct drm_fb_helper_surface_size *sizes) 1746 { 1747 struct drm_framebuffer *fb = fb_helper->fb; 1748 1749 drm_fb_helper_fill_fix(info, fb->pitches[0], 1750 fb->format->is_color_indexed); 1751 drm_fb_helper_fill_var(info, fb_helper, 1752 sizes->fb_width, sizes->fb_height); 1753 1754 info->par = fb_helper; 1755 /* 1756 * The DRM drivers fbdev emulation device name can be confusing if the 1757 * driver name also has a "drm" suffix on it. Leading to names such as 1758 * "simpledrmdrmfb" in /proc/fb. Unfortunately, it's an uAPI and can't 1759 * be changed due user-space tools (e.g: pm-utils) matching against it. 1760 */ 1761 snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb", 1762 fb_helper->dev->driver->name); 1763 1764 } 1765 EXPORT_SYMBOL(drm_fb_helper_fill_info); 1766 1767 /* 1768 * This is a continuation of drm_setup_crtcs() that sets up anything related 1769 * to the framebuffer. During initialization, drm_setup_crtcs() is called before 1770 * the framebuffer has been allocated (fb_helper->fb and fb_helper->info). 1771 * So, any setup that touches those fields needs to be done here instead of in 1772 * drm_setup_crtcs(). 1773 */ 1774 static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper) 1775 { 1776 struct drm_client_dev *client = &fb_helper->client; 1777 struct drm_connector_list_iter conn_iter; 1778 struct fb_info *info = fb_helper->info; 1779 unsigned int rotation, sw_rotations = 0; 1780 struct drm_connector *connector; 1781 struct drm_mode_set *modeset; 1782 1783 mutex_lock(&client->modeset_mutex); 1784 drm_client_for_each_modeset(modeset, client) { 1785 if (!modeset->num_connectors) 1786 continue; 1787 1788 modeset->fb = fb_helper->fb; 1789 1790 if (drm_client_rotation(modeset, &rotation)) 1791 /* Rotating in hardware, fbcon should not rotate */ 1792 sw_rotations |= DRM_MODE_ROTATE_0; 1793 else 1794 sw_rotations |= rotation; 1795 } 1796 mutex_unlock(&client->modeset_mutex); 1797 1798 drm_connector_list_iter_begin(fb_helper->dev, &conn_iter); 1799 drm_client_for_each_connector_iter(connector, &conn_iter) { 1800 1801 /* use first connected connector for the physical dimensions */ 1802 if (connector->status == connector_status_connected) { 1803 info->var.width = connector->display_info.width_mm; 1804 info->var.height = connector->display_info.height_mm; 1805 break; 1806 } 1807 } 1808 drm_connector_list_iter_end(&conn_iter); 1809 1810 switch (sw_rotations) { 1811 case DRM_MODE_ROTATE_0: 1812 info->fbcon_rotate_hint = FB_ROTATE_UR; 1813 break; 1814 case DRM_MODE_ROTATE_90: 1815 info->fbcon_rotate_hint = FB_ROTATE_CCW; 1816 break; 1817 case DRM_MODE_ROTATE_180: 1818 info->fbcon_rotate_hint = FB_ROTATE_UD; 1819 break; 1820 case DRM_MODE_ROTATE_270: 1821 info->fbcon_rotate_hint = FB_ROTATE_CW; 1822 break; 1823 default: 1824 /* 1825 * Multiple bits are set / multiple rotations requested 1826 * fbcon cannot handle separate rotation settings per 1827 * output, so fallback to unrotated. 1828 */ 1829 info->fbcon_rotate_hint = FB_ROTATE_UR; 1830 } 1831 } 1832 1833 /* Note: Drops fb_helper->lock before returning. */ 1834 static int 1835 __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper) 1836 { 1837 struct drm_device *dev = fb_helper->dev; 1838 struct fb_info *info; 1839 unsigned int width, height; 1840 int ret; 1841 1842 width = dev->mode_config.max_width; 1843 height = dev->mode_config.max_height; 1844 1845 drm_client_modeset_probe(&fb_helper->client, width, height); 1846 ret = drm_fb_helper_single_fb_probe(fb_helper); 1847 if (ret < 0) { 1848 if (ret == -EAGAIN) { 1849 fb_helper->deferred_setup = true; 1850 ret = 0; 1851 } 1852 mutex_unlock(&fb_helper->lock); 1853 1854 return ret; 1855 } 1856 drm_setup_crtcs_fb(fb_helper); 1857 1858 fb_helper->deferred_setup = false; 1859 1860 info = fb_helper->info; 1861 info->var.pixclock = 0; 1862 1863 if (!drm_leak_fbdev_smem) 1864 info->flags |= FBINFO_HIDE_SMEM_START; 1865 1866 /* Need to drop locks to avoid recursive deadlock in 1867 * register_framebuffer. This is ok because the only thing left to do is 1868 * register the fbdev emulation instance in kernel_fb_helper_list. */ 1869 mutex_unlock(&fb_helper->lock); 1870 1871 ret = register_framebuffer(info); 1872 if (ret < 0) 1873 return ret; 1874 1875 drm_info(dev, "fb%d: %s frame buffer device\n", 1876 info->node, info->fix.id); 1877 1878 mutex_lock(&kernel_fb_helper_lock); 1879 if (list_empty(&kernel_fb_helper_list)) 1880 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); 1881 1882 list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); 1883 mutex_unlock(&kernel_fb_helper_lock); 1884 1885 return 0; 1886 } 1887 1888 /** 1889 * drm_fb_helper_initial_config - setup a sane initial connector configuration 1890 * @fb_helper: fb_helper device struct 1891 * 1892 * Scans the CRTCs and connectors and tries to put together an initial setup. 1893 * At the moment, this is a cloned configuration across all heads with 1894 * a new framebuffer object as the backing store. 1895 * 1896 * Note that this also registers the fbdev and so allows userspace to call into 1897 * the driver through the fbdev interfaces. 1898 * 1899 * This function will call down into the &drm_fb_helper_funcs.fb_probe callback 1900 * to let the driver allocate and initialize the fbdev info structure and the 1901 * drm framebuffer used to back the fbdev. drm_fb_helper_fill_info() is provided 1902 * as a helper to setup simple default values for the fbdev info structure. 1903 * 1904 * HANG DEBUGGING: 1905 * 1906 * When you have fbcon support built-in or already loaded, this function will do 1907 * a full modeset to setup the fbdev console. Due to locking misdesign in the 1908 * VT/fbdev subsystem that entire modeset sequence has to be done while holding 1909 * console_lock. Until console_unlock is called no dmesg lines will be sent out 1910 * to consoles, not even serial console. This means when your driver crashes, 1911 * you will see absolutely nothing else but a system stuck in this function, 1912 * with no further output. Any kind of printk() you place within your own driver 1913 * or in the drm core modeset code will also never show up. 1914 * 1915 * Standard debug practice is to run the fbcon setup without taking the 1916 * console_lock as a hack, to be able to see backtraces and crashes on the 1917 * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel 1918 * cmdline option. 1919 * 1920 * The other option is to just disable fbdev emulation since very likely the 1921 * first modeset from userspace will crash in the same way, and is even easier 1922 * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 1923 * kernel cmdline option. 1924 * 1925 * RETURNS: 1926 * Zero if everything went ok, nonzero otherwise. 1927 */ 1928 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper) 1929 { 1930 int ret; 1931 1932 if (!drm_fbdev_emulation) 1933 return 0; 1934 1935 mutex_lock(&fb_helper->lock); 1936 ret = __drm_fb_helper_initial_config_and_unlock(fb_helper); 1937 1938 return ret; 1939 } 1940 EXPORT_SYMBOL(drm_fb_helper_initial_config); 1941 1942 /** 1943 * drm_fb_helper_hotplug_event - respond to a hotplug notification by 1944 * probing all the outputs attached to the fb 1945 * @fb_helper: driver-allocated fbdev helper, can be NULL 1946 * 1947 * Scan the connectors attached to the fb_helper and try to put together a 1948 * setup after notification of a change in output configuration. 1949 * 1950 * Called at runtime, takes the mode config locks to be able to check/change the 1951 * modeset configuration. Must be run from process context (which usually means 1952 * either the output polling work or a work item launched from the driver's 1953 * hotplug interrupt). 1954 * 1955 * Note that drivers may call this even before calling 1956 * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows 1957 * for a race-free fbcon setup and will make sure that the fbdev emulation will 1958 * not miss any hotplug events. 1959 * 1960 * RETURNS: 1961 * 0 on success and a non-zero error code otherwise. 1962 */ 1963 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 1964 { 1965 int err = 0; 1966 1967 if (!drm_fbdev_emulation || !fb_helper) 1968 return 0; 1969 1970 mutex_lock(&fb_helper->lock); 1971 if (fb_helper->deferred_setup) { 1972 err = __drm_fb_helper_initial_config_and_unlock(fb_helper); 1973 return err; 1974 } 1975 1976 if (!fb_helper->fb || !drm_master_internal_acquire(fb_helper->dev)) { 1977 fb_helper->delayed_hotplug = true; 1978 mutex_unlock(&fb_helper->lock); 1979 return err; 1980 } 1981 1982 drm_master_internal_release(fb_helper->dev); 1983 1984 drm_dbg_kms(fb_helper->dev, "\n"); 1985 1986 drm_client_modeset_probe(&fb_helper->client, fb_helper->fb->width, fb_helper->fb->height); 1987 drm_setup_crtcs_fb(fb_helper); 1988 mutex_unlock(&fb_helper->lock); 1989 1990 drm_fb_helper_set_par(fb_helper->info); 1991 1992 return 0; 1993 } 1994 EXPORT_SYMBOL(drm_fb_helper_hotplug_event); 1995 1996 /** 1997 * drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation 1998 * @dev: DRM device 1999 * 2000 * This function can be used as the &drm_driver->lastclose callback for drivers 2001 * that only need to call drm_fb_helper_restore_fbdev_mode_unlocked(). 2002 */ 2003 void drm_fb_helper_lastclose(struct drm_device *dev) 2004 { 2005 drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper); 2006 } 2007 EXPORT_SYMBOL(drm_fb_helper_lastclose); 2008 2009 /** 2010 * drm_fb_helper_output_poll_changed - DRM mode config \.output_poll_changed 2011 * helper for fbdev emulation 2012 * @dev: DRM device 2013 * 2014 * This function can be used as the 2015 * &drm_mode_config_funcs.output_poll_changed callback for drivers that only 2016 * need to call drm_fbdev.hotplug_event(). 2017 */ 2018 void drm_fb_helper_output_poll_changed(struct drm_device *dev) 2019 { 2020 drm_fb_helper_hotplug_event(dev->fb_helper); 2021 } 2022 EXPORT_SYMBOL(drm_fb_helper_output_poll_changed); 2023