1 /* 2 * Copyright © 2006 Keith Packard 3 * Copyright © 2007-2008 Dave Airlie 4 * Copyright © 2007-2008 Intel Corporation 5 * Jesse Barnes <jesse.barnes@intel.com> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 #ifndef __DRM_CRTC_H__ 26 #define __DRM_CRTC_H__ 27 28 #include <linux/i2c.h> 29 #include <linux/spinlock.h> 30 #include <linux/types.h> 31 #include <linux/fb.h> 32 #include <linux/hdmi.h> 33 #include <linux/media-bus-format.h> 34 #include <uapi/drm/drm_mode.h> 35 #include <uapi/drm/drm_fourcc.h> 36 #include <drm/drm_modeset_lock.h> 37 #include <drm/drm_rect.h> 38 #include <drm/drm_mode_object.h> 39 #include <drm/drm_modes.h> 40 #include <drm/drm_device.h> 41 #include <drm/drm_property.h> 42 #include <drm/drm_plane.h> 43 #include <drm/drm_color_mgmt.h> 44 #include <drm/drm_debugfs_crc.h> 45 #include <drm/drm_mode_config.h> 46 47 struct drm_connector; 48 struct drm_device; 49 struct drm_framebuffer; 50 struct drm_mode_set; 51 struct drm_file; 52 struct drm_clip_rect; 53 struct drm_printer; 54 struct drm_self_refresh_data; 55 struct device_node; 56 struct dma_fence; 57 struct edid; 58 59 static inline int64_t U642I64(uint64_t val) 60 { 61 return (int64_t)*((int64_t *)&val); 62 } 63 static inline uint64_t I642U64(int64_t val) 64 { 65 return (uint64_t)*((uint64_t *)&val); 66 } 67 68 struct drm_crtc; 69 struct drm_pending_vblank_event; 70 struct drm_plane; 71 struct drm_bridge; 72 struct drm_atomic_state; 73 74 struct drm_crtc_helper_funcs; 75 struct drm_plane_helper_funcs; 76 77 /** 78 * struct drm_crtc_state - mutable CRTC state 79 * 80 * Note that the distinction between @enable and @active is rather subtle: 81 * Flipping @active while @enable is set without changing anything else may 82 * never return in a failure from the &drm_mode_config_funcs.atomic_check 83 * callback. Userspace assumes that a DPMS On will always succeed. In other 84 * words: @enable controls resource assignment, @active controls the actual 85 * hardware state. 86 * 87 * The three booleans active_changed, connectors_changed and mode_changed are 88 * intended to indicate whether a full modeset is needed, rather than strictly 89 * describing what has changed in a commit. See also: 90 * drm_atomic_crtc_needs_modeset() 91 * 92 * WARNING: Transitional helpers (like drm_helper_crtc_mode_set() or 93 * drm_helper_crtc_mode_set_base()) do not maintain many of the derived control 94 * state like @plane_mask so drivers not converted over to atomic helpers should 95 * not rely on these being accurate! 96 */ 97 struct drm_crtc_state { 98 /** @crtc: backpointer to the CRTC */ 99 struct drm_crtc *crtc; 100 101 /** 102 * @enable: Whether the CRTC should be enabled, gates all other state. 103 * This controls reservations of shared resources. Actual hardware state 104 * is controlled by @active. 105 */ 106 bool enable; 107 108 /** 109 * @active: Whether the CRTC is actively displaying (used for DPMS). 110 * Implies that @enable is set. The driver must not release any shared 111 * resources if @active is set to false but @enable still true, because 112 * userspace expects that a DPMS ON always succeeds. 113 * 114 * Hence drivers must not consult @active in their various 115 * &drm_mode_config_funcs.atomic_check callback to reject an atomic 116 * commit. They can consult it to aid in the computation of derived 117 * hardware state, since even in the DPMS OFF state the display hardware 118 * should be as much powered down as when the CRTC is completely 119 * disabled through setting @enable to false. 120 */ 121 bool active; 122 123 /** 124 * @planes_changed: Planes on this crtc are updated. Used by the atomic 125 * helpers and drivers to steer the atomic commit control flow. 126 */ 127 bool planes_changed : 1; 128 129 /** 130 * @mode_changed: @mode or @enable has been changed. Used by the atomic 131 * helpers and drivers to steer the atomic commit control flow. See also 132 * drm_atomic_crtc_needs_modeset(). 133 * 134 * Drivers are supposed to set this for any CRTC state changes that 135 * require a full modeset. They can also reset it to false if e.g. a 136 * @mode change can be done without a full modeset by only changing 137 * scaler settings. 138 */ 139 bool mode_changed : 1; 140 141 /** 142 * @active_changed: @active has been toggled. Used by the atomic 143 * helpers and drivers to steer the atomic commit control flow. See also 144 * drm_atomic_crtc_needs_modeset(). 145 */ 146 bool active_changed : 1; 147 148 /** 149 * @connectors_changed: Connectors to this crtc have been updated, 150 * either in their state or routing. Used by the atomic 151 * helpers and drivers to steer the atomic commit control flow. See also 152 * drm_atomic_crtc_needs_modeset(). 153 * 154 * Drivers are supposed to set this as-needed from their own atomic 155 * check code, e.g. from &drm_encoder_helper_funcs.atomic_check 156 */ 157 bool connectors_changed : 1; 158 /** 159 * @zpos_changed: zpos values of planes on this crtc have been updated. 160 * Used by the atomic helpers and drivers to steer the atomic commit 161 * control flow. 162 */ 163 bool zpos_changed : 1; 164 /** 165 * @color_mgmt_changed: Color management properties have changed 166 * (@gamma_lut, @degamma_lut or @ctm). Used by the atomic helpers and 167 * drivers to steer the atomic commit control flow. 168 */ 169 bool color_mgmt_changed : 1; 170 171 /** 172 * @no_vblank: 173 * 174 * Reflects the ability of a CRTC to send VBLANK events. This state 175 * usually depends on the pipeline configuration. If set to true, DRM 176 * atomic helpers will send out a fake VBLANK event during display 177 * updates after all hardware changes have been committed. This is 178 * implemented in drm_atomic_helper_fake_vblank(). 179 * 180 * One usage is for drivers and/or hardware without support for VBLANK 181 * interrupts. Such drivers typically do not initialize vblanking 182 * (i.e., call drm_vblank_init() with the number of CRTCs). For CRTCs 183 * without initialized vblanking, this field is set to true in 184 * drm_atomic_helper_check_modeset(), and a fake VBLANK event will be 185 * send out on each update of the display pipeline by 186 * drm_atomic_helper_fake_vblank(). 187 * 188 * Another usage is CRTCs feeding a writeback connector operating in 189 * oneshot mode. In this case the fake VBLANK event is only generated 190 * when a job is queued to the writeback connector, and we want the 191 * core to fake VBLANK events when this part of the pipeline hasn't 192 * changed but others had or when the CRTC and connectors are being 193 * disabled. 194 * 195 * __drm_atomic_helper_crtc_duplicate_state() will not reset the value 196 * from the current state, the CRTC driver is then responsible for 197 * updating this field when needed. 198 * 199 * Note that the combination of &drm_crtc_state.event == NULL and 200 * &drm_crtc_state.no_blank == true is valid and usually used when the 201 * writeback connector attached to the CRTC has a new job queued. In 202 * this case the driver will send the VBLANK event on its own when the 203 * writeback job is complete. 204 */ 205 bool no_vblank : 1; 206 207 /** 208 * @plane_mask: Bitmask of drm_plane_mask(plane) of planes attached to 209 * this CRTC. 210 */ 211 u32 plane_mask; 212 213 /** 214 * @connector_mask: Bitmask of drm_connector_mask(connector) of 215 * connectors attached to this CRTC. 216 */ 217 u32 connector_mask; 218 219 /** 220 * @encoder_mask: Bitmask of drm_encoder_mask(encoder) of encoders 221 * attached to this CRTC. 222 */ 223 u32 encoder_mask; 224 225 /** 226 * @adjusted_mode: 227 * 228 * Internal display timings which can be used by the driver to handle 229 * differences between the mode requested by userspace in @mode and what 230 * is actually programmed into the hardware. 231 * 232 * For drivers using &drm_bridge, this stores hardware display timings 233 * used between the CRTC and the first bridge. For other drivers, the 234 * meaning of the adjusted_mode field is purely driver implementation 235 * defined information, and will usually be used to store the hardware 236 * display timings used between the CRTC and encoder blocks. 237 */ 238 struct drm_display_mode adjusted_mode; 239 240 /** 241 * @mode: 242 * 243 * Display timings requested by userspace. The driver should try to 244 * match the refresh rate as close as possible (but note that it's 245 * undefined what exactly is close enough, e.g. some of the HDMI modes 246 * only differ in less than 1% of the refresh rate). The active width 247 * and height as observed by userspace for positioning planes must match 248 * exactly. 249 * 250 * For external connectors where the sink isn't fixed (like with a 251 * built-in panel), this mode here should match the physical mode on the 252 * wire to the last details (i.e. including sync polarities and 253 * everything). 254 */ 255 struct drm_display_mode mode; 256 257 /** 258 * @mode_blob: &drm_property_blob for @mode, for exposing the mode to 259 * atomic userspace. 260 */ 261 struct drm_property_blob *mode_blob; 262 263 /** 264 * @degamma_lut: 265 * 266 * Lookup table for converting framebuffer pixel data before apply the 267 * color conversion matrix @ctm. See drm_crtc_enable_color_mgmt(). The 268 * blob (if not NULL) is an array of &struct drm_color_lut. 269 */ 270 struct drm_property_blob *degamma_lut; 271 272 /** 273 * @ctm: 274 * 275 * Color transformation matrix. See drm_crtc_enable_color_mgmt(). The 276 * blob (if not NULL) is a &struct drm_color_ctm. 277 */ 278 struct drm_property_blob *ctm; 279 280 /** 281 * @gamma_lut: 282 * 283 * Lookup table for converting pixel data after the color conversion 284 * matrix @ctm. See drm_crtc_enable_color_mgmt(). The blob (if not 285 * NULL) is an array of &struct drm_color_lut. 286 * 287 * Note that for mostly historical reasons stemming from Xorg heritage, 288 * this is also used to store the color map (also sometimes color lut, 289 * CLUT or color palette) for indexed formats like DRM_FORMAT_C8. 290 */ 291 struct drm_property_blob *gamma_lut; 292 293 /** 294 * @target_vblank: 295 * 296 * Target vertical blank period when a page flip 297 * should take effect. 298 */ 299 u32 target_vblank; 300 301 /** 302 * @async_flip: 303 * 304 * This is set when DRM_MODE_PAGE_FLIP_ASYNC is set in the legacy 305 * PAGE_FLIP IOCTL. It's not wired up for the atomic IOCTL itself yet. 306 */ 307 bool async_flip; 308 309 /** 310 * @vrr_enabled: 311 * 312 * Indicates if variable refresh rate should be enabled for the CRTC. 313 * Support for the requested vrr state will depend on driver and 314 * hardware capabiltiy - lacking support is not treated as failure. 315 */ 316 bool vrr_enabled; 317 318 /** 319 * @self_refresh_active: 320 * 321 * Used by the self refresh helpers to denote when a self refresh 322 * transition is occurring. This will be set on enable/disable callbacks 323 * when self refresh is being enabled or disabled. In some cases, it may 324 * not be desirable to fully shut off the crtc during self refresh. 325 * CRTC's can inspect this flag and determine the best course of action. 326 */ 327 bool self_refresh_active; 328 329 /** 330 * @scaling_filter: 331 * 332 * Scaling filter to be applied 333 */ 334 enum drm_scaling_filter scaling_filter; 335 336 /** 337 * @event: 338 * 339 * Optional pointer to a DRM event to signal upon completion of the 340 * state update. The driver must send out the event when the atomic 341 * commit operation completes. There are two cases: 342 * 343 * - The event is for a CRTC which is being disabled through this 344 * atomic commit. In that case the event can be send out any time 345 * after the hardware has stopped scanning out the current 346 * framebuffers. It should contain the timestamp and counter for the 347 * last vblank before the display pipeline was shut off. The simplest 348 * way to achieve that is calling drm_crtc_send_vblank_event() 349 * somewhen after drm_crtc_vblank_off() has been called. 350 * 351 * - For a CRTC which is enabled at the end of the commit (even when it 352 * undergoes an full modeset) the vblank timestamp and counter must 353 * be for the vblank right before the first frame that scans out the 354 * new set of buffers. Again the event can only be sent out after the 355 * hardware has stopped scanning out the old buffers. 356 * 357 * - Events for disabled CRTCs are not allowed, and drivers can ignore 358 * that case. 359 * 360 * For very simple hardware without VBLANK interrupt, enabling 361 * &struct drm_crtc_state.no_vblank makes DRM's atomic commit helpers 362 * send a fake VBLANK event at the end of the display update after all 363 * hardware changes have been applied. See 364 * drm_atomic_helper_fake_vblank(). 365 * 366 * For more complex hardware this 367 * can be handled by the drm_crtc_send_vblank_event() function, 368 * which the driver should call on the provided event upon completion of 369 * the atomic commit. Note that if the driver supports vblank signalling 370 * and timestamping the vblank counters and timestamps must agree with 371 * the ones returned from page flip events. With the current vblank 372 * helper infrastructure this can be achieved by holding a vblank 373 * reference while the page flip is pending, acquired through 374 * drm_crtc_vblank_get() and released with drm_crtc_vblank_put(). 375 * Drivers are free to implement their own vblank counter and timestamp 376 * tracking though, e.g. if they have accurate timestamp registers in 377 * hardware. 378 * 379 * For hardware which supports some means to synchronize vblank 380 * interrupt delivery with committing display state there's also 381 * drm_crtc_arm_vblank_event(). See the documentation of that function 382 * for a detailed discussion of the constraints it needs to be used 383 * safely. 384 * 385 * If the device can't notify of flip completion in a race-free way 386 * at all, then the event should be armed just after the page flip is 387 * committed. In the worst case the driver will send the event to 388 * userspace one frame too late. This doesn't allow for a real atomic 389 * update, but it should avoid tearing. 390 */ 391 struct drm_pending_vblank_event *event; 392 393 /** 394 * @commit: 395 * 396 * This tracks how the commit for this update proceeds through the 397 * various phases. This is never cleared, except when we destroy the 398 * state, so that subsequent commits can synchronize with previous ones. 399 */ 400 struct drm_crtc_commit *commit; 401 402 /** @state: backpointer to global drm_atomic_state */ 403 struct drm_atomic_state *state; 404 }; 405 406 /** 407 * struct drm_crtc_funcs - control CRTCs for a given device 408 * 409 * The drm_crtc_funcs structure is the central CRTC management structure 410 * in the DRM. Each CRTC controls one or more connectors (note that the name 411 * CRTC is simply historical, a CRTC may control LVDS, VGA, DVI, TV out, etc. 412 * connectors, not just CRTs). 413 * 414 * Each driver is responsible for filling out this structure at startup time, 415 * in addition to providing other modesetting features, like i2c and DDC 416 * bus accessors. 417 */ 418 struct drm_crtc_funcs { 419 /** 420 * @reset: 421 * 422 * Reset CRTC hardware and software state to off. This function isn't 423 * called by the core directly, only through drm_mode_config_reset(). 424 * It's not a helper hook only for historical reasons. 425 * 426 * Atomic drivers can use drm_atomic_helper_crtc_reset() to reset 427 * atomic state using this hook. 428 */ 429 void (*reset)(struct drm_crtc *crtc); 430 431 /** 432 * @cursor_set: 433 * 434 * Update the cursor image. The cursor position is relative to the CRTC 435 * and can be partially or fully outside of the visible area. 436 * 437 * Note that contrary to all other KMS functions the legacy cursor entry 438 * points don't take a framebuffer object, but instead take directly a 439 * raw buffer object id from the driver's buffer manager (which is 440 * either GEM or TTM for current drivers). 441 * 442 * This entry point is deprecated, drivers should instead implement 443 * universal plane support and register a proper cursor plane using 444 * drm_crtc_init_with_planes(). 445 * 446 * This callback is optional 447 * 448 * RETURNS: 449 * 450 * 0 on success or a negative error code on failure. 451 */ 452 int (*cursor_set)(struct drm_crtc *crtc, struct drm_file *file_priv, 453 uint32_t handle, uint32_t width, uint32_t height); 454 455 /** 456 * @cursor_set2: 457 * 458 * Update the cursor image, including hotspot information. The hotspot 459 * must not affect the cursor position in CRTC coordinates, but is only 460 * meant as a hint for virtualized display hardware to coordinate the 461 * guests and hosts cursor position. The cursor hotspot is relative to 462 * the cursor image. Otherwise this works exactly like @cursor_set. 463 * 464 * This entry point is deprecated, drivers should instead implement 465 * universal plane support and register a proper cursor plane using 466 * drm_crtc_init_with_planes(). 467 * 468 * This callback is optional. 469 * 470 * RETURNS: 471 * 472 * 0 on success or a negative error code on failure. 473 */ 474 int (*cursor_set2)(struct drm_crtc *crtc, struct drm_file *file_priv, 475 uint32_t handle, uint32_t width, uint32_t height, 476 int32_t hot_x, int32_t hot_y); 477 478 /** 479 * @cursor_move: 480 * 481 * Update the cursor position. The cursor does not need to be visible 482 * when this hook is called. 483 * 484 * This entry point is deprecated, drivers should instead implement 485 * universal plane support and register a proper cursor plane using 486 * drm_crtc_init_with_planes(). 487 * 488 * This callback is optional. 489 * 490 * RETURNS: 491 * 492 * 0 on success or a negative error code on failure. 493 */ 494 int (*cursor_move)(struct drm_crtc *crtc, int x, int y); 495 496 /** 497 * @gamma_set: 498 * 499 * Set gamma on the CRTC. 500 * 501 * This callback is optional. 502 * 503 * Atomic drivers who want to support gamma tables should implement the 504 * atomic color management support, enabled by calling 505 * drm_crtc_enable_color_mgmt(), which then supports the legacy gamma 506 * interface through the drm_atomic_helper_legacy_gamma_set() 507 * compatibility implementation. 508 */ 509 int (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b, 510 uint32_t size, 511 struct drm_modeset_acquire_ctx *ctx); 512 513 /** 514 * @destroy: 515 * 516 * Clean up CRTC resources. This is only called at driver unload time 517 * through drm_mode_config_cleanup() since a CRTC cannot be hotplugged 518 * in DRM. 519 */ 520 void (*destroy)(struct drm_crtc *crtc); 521 522 /** 523 * @set_config: 524 * 525 * This is the main legacy entry point to change the modeset state on a 526 * CRTC. All the details of the desired configuration are passed in a 527 * &struct drm_mode_set - see there for details. 528 * 529 * Drivers implementing atomic modeset should use 530 * drm_atomic_helper_set_config() to implement this hook. 531 * 532 * RETURNS: 533 * 534 * 0 on success or a negative error code on failure. 535 */ 536 int (*set_config)(struct drm_mode_set *set, 537 struct drm_modeset_acquire_ctx *ctx); 538 539 /** 540 * @page_flip: 541 * 542 * Legacy entry point to schedule a flip to the given framebuffer. 543 * 544 * Page flipping is a synchronization mechanism that replaces the frame 545 * buffer being scanned out by the CRTC with a new frame buffer during 546 * vertical blanking, avoiding tearing (except when requested otherwise 547 * through the DRM_MODE_PAGE_FLIP_ASYNC flag). When an application 548 * requests a page flip the DRM core verifies that the new frame buffer 549 * is large enough to be scanned out by the CRTC in the currently 550 * configured mode and then calls this hook with a pointer to the new 551 * frame buffer. 552 * 553 * The driver must wait for any pending rendering to the new framebuffer 554 * to complete before executing the flip. It should also wait for any 555 * pending rendering from other drivers if the underlying buffer is a 556 * shared dma-buf. 557 * 558 * An application can request to be notified when the page flip has 559 * completed. The drm core will supply a &struct drm_event in the event 560 * parameter in this case. This can be handled by the 561 * drm_crtc_send_vblank_event() function, which the driver should call on 562 * the provided event upon completion of the flip. Note that if 563 * the driver supports vblank signalling and timestamping the vblank 564 * counters and timestamps must agree with the ones returned from page 565 * flip events. With the current vblank helper infrastructure this can 566 * be achieved by holding a vblank reference while the page flip is 567 * pending, acquired through drm_crtc_vblank_get() and released with 568 * drm_crtc_vblank_put(). Drivers are free to implement their own vblank 569 * counter and timestamp tracking though, e.g. if they have accurate 570 * timestamp registers in hardware. 571 * 572 * This callback is optional. 573 * 574 * NOTE: 575 * 576 * Very early versions of the KMS ABI mandated that the driver must 577 * block (but not reject) any rendering to the old framebuffer until the 578 * flip operation has completed and the old framebuffer is no longer 579 * visible. This requirement has been lifted, and userspace is instead 580 * expected to request delivery of an event and wait with recycling old 581 * buffers until such has been received. 582 * 583 * RETURNS: 584 * 585 * 0 on success or a negative error code on failure. Note that if a 586 * page flip operation is already pending the callback should return 587 * -EBUSY. Pageflips on a disabled CRTC (either by setting a NULL mode 588 * or just runtime disabled through DPMS respectively the new atomic 589 * "ACTIVE" state) should result in an -EINVAL error code. Note that 590 * drm_atomic_helper_page_flip() checks this already for atomic drivers. 591 */ 592 int (*page_flip)(struct drm_crtc *crtc, 593 struct drm_framebuffer *fb, 594 struct drm_pending_vblank_event *event, 595 uint32_t flags, 596 struct drm_modeset_acquire_ctx *ctx); 597 598 /** 599 * @page_flip_target: 600 * 601 * Same as @page_flip but with an additional parameter specifying the 602 * absolute target vertical blank period (as reported by 603 * drm_crtc_vblank_count()) when the flip should take effect. 604 * 605 * Note that the core code calls drm_crtc_vblank_get before this entry 606 * point, and will call drm_crtc_vblank_put if this entry point returns 607 * any non-0 error code. It's the driver's responsibility to call 608 * drm_crtc_vblank_put after this entry point returns 0, typically when 609 * the flip completes. 610 */ 611 int (*page_flip_target)(struct drm_crtc *crtc, 612 struct drm_framebuffer *fb, 613 struct drm_pending_vblank_event *event, 614 uint32_t flags, uint32_t target, 615 struct drm_modeset_acquire_ctx *ctx); 616 617 /** 618 * @set_property: 619 * 620 * This is the legacy entry point to update a property attached to the 621 * CRTC. 622 * 623 * This callback is optional if the driver does not support any legacy 624 * driver-private properties. For atomic drivers it is not used because 625 * property handling is done entirely in the DRM core. 626 * 627 * RETURNS: 628 * 629 * 0 on success or a negative error code on failure. 630 */ 631 int (*set_property)(struct drm_crtc *crtc, 632 struct drm_property *property, uint64_t val); 633 634 /** 635 * @atomic_duplicate_state: 636 * 637 * Duplicate the current atomic state for this CRTC and return it. 638 * The core and helpers guarantee that any atomic state duplicated with 639 * this hook and still owned by the caller (i.e. not transferred to the 640 * driver by calling &drm_mode_config_funcs.atomic_commit) will be 641 * cleaned up by calling the @atomic_destroy_state hook in this 642 * structure. 643 * 644 * This callback is mandatory for atomic drivers. 645 * 646 * Atomic drivers which don't subclass &struct drm_crtc_state should use 647 * drm_atomic_helper_crtc_duplicate_state(). Drivers that subclass the 648 * state structure to extend it with driver-private state should use 649 * __drm_atomic_helper_crtc_duplicate_state() to make sure shared state is 650 * duplicated in a consistent fashion across drivers. 651 * 652 * It is an error to call this hook before &drm_crtc.state has been 653 * initialized correctly. 654 * 655 * NOTE: 656 * 657 * If the duplicate state references refcounted resources this hook must 658 * acquire a reference for each of them. The driver must release these 659 * references again in @atomic_destroy_state. 660 * 661 * RETURNS: 662 * 663 * Duplicated atomic state or NULL when the allocation failed. 664 */ 665 struct drm_crtc_state *(*atomic_duplicate_state)(struct drm_crtc *crtc); 666 667 /** 668 * @atomic_destroy_state: 669 * 670 * Destroy a state duplicated with @atomic_duplicate_state and release 671 * or unreference all resources it references 672 * 673 * This callback is mandatory for atomic drivers. 674 */ 675 void (*atomic_destroy_state)(struct drm_crtc *crtc, 676 struct drm_crtc_state *state); 677 678 /** 679 * @atomic_set_property: 680 * 681 * Decode a driver-private property value and store the decoded value 682 * into the passed-in state structure. Since the atomic core decodes all 683 * standardized properties (even for extensions beyond the core set of 684 * properties which might not be implemented by all drivers) this 685 * requires drivers to subclass the state structure. 686 * 687 * Such driver-private properties should really only be implemented for 688 * truly hardware/vendor specific state. Instead it is preferred to 689 * standardize atomic extension and decode the properties used to expose 690 * such an extension in the core. 691 * 692 * Do not call this function directly, use 693 * drm_atomic_crtc_set_property() instead. 694 * 695 * This callback is optional if the driver does not support any 696 * driver-private atomic properties. 697 * 698 * NOTE: 699 * 700 * This function is called in the state assembly phase of atomic 701 * modesets, which can be aborted for any reason (including on 702 * userspace's request to just check whether a configuration would be 703 * possible). Drivers MUST NOT touch any persistent state (hardware or 704 * software) or data structures except the passed in @state parameter. 705 * 706 * Also since userspace controls in which order properties are set this 707 * function must not do any input validation (since the state update is 708 * incomplete and hence likely inconsistent). Instead any such input 709 * validation must be done in the various atomic_check callbacks. 710 * 711 * RETURNS: 712 * 713 * 0 if the property has been found, -EINVAL if the property isn't 714 * implemented by the driver (which should never happen, the core only 715 * asks for properties attached to this CRTC). No other validation is 716 * allowed by the driver. The core already checks that the property 717 * value is within the range (integer, valid enum value, ...) the driver 718 * set when registering the property. 719 */ 720 int (*atomic_set_property)(struct drm_crtc *crtc, 721 struct drm_crtc_state *state, 722 struct drm_property *property, 723 uint64_t val); 724 /** 725 * @atomic_get_property: 726 * 727 * Reads out the decoded driver-private property. This is used to 728 * implement the GETCRTC IOCTL. 729 * 730 * Do not call this function directly, use 731 * drm_atomic_crtc_get_property() instead. 732 * 733 * This callback is optional if the driver does not support any 734 * driver-private atomic properties. 735 * 736 * RETURNS: 737 * 738 * 0 on success, -EINVAL if the property isn't implemented by the 739 * driver (which should never happen, the core only asks for 740 * properties attached to this CRTC). 741 */ 742 int (*atomic_get_property)(struct drm_crtc *crtc, 743 const struct drm_crtc_state *state, 744 struct drm_property *property, 745 uint64_t *val); 746 747 /** 748 * @late_register: 749 * 750 * This optional hook can be used to register additional userspace 751 * interfaces attached to the crtc like debugfs interfaces. 752 * It is called late in the driver load sequence from drm_dev_register(). 753 * Everything added from this callback should be unregistered in 754 * the early_unregister callback. 755 * 756 * Returns: 757 * 758 * 0 on success, or a negative error code on failure. 759 */ 760 int (*late_register)(struct drm_crtc *crtc); 761 762 /** 763 * @early_unregister: 764 * 765 * This optional hook should be used to unregister the additional 766 * userspace interfaces attached to the crtc from 767 * @late_register. It is called from drm_dev_unregister(), 768 * early in the driver unload sequence to disable userspace access 769 * before data structures are torndown. 770 */ 771 void (*early_unregister)(struct drm_crtc *crtc); 772 773 /** 774 * @set_crc_source: 775 * 776 * Changes the source of CRC checksums of frames at the request of 777 * userspace, typically for testing purposes. The sources available are 778 * specific of each driver and a %NULL value indicates that CRC 779 * generation is to be switched off. 780 * 781 * When CRC generation is enabled, the driver should call 782 * drm_crtc_add_crc_entry() at each frame, providing any information 783 * that characterizes the frame contents in the crcN arguments, as 784 * provided from the configured source. Drivers must accept an "auto" 785 * source name that will select a default source for this CRTC. 786 * 787 * This may trigger an atomic modeset commit if necessary, to enable CRC 788 * generation. 789 * 790 * Note that "auto" can depend upon the current modeset configuration, 791 * e.g. it could pick an encoder or output specific CRC sampling point. 792 * 793 * This callback is optional if the driver does not support any CRC 794 * generation functionality. 795 * 796 * RETURNS: 797 * 798 * 0 on success or a negative error code on failure. 799 */ 800 int (*set_crc_source)(struct drm_crtc *crtc, const char *source); 801 802 /** 803 * @verify_crc_source: 804 * 805 * verifies the source of CRC checksums of frames before setting the 806 * source for CRC and during crc open. Source parameter can be NULL 807 * while disabling crc source. 808 * 809 * This callback is optional if the driver does not support any CRC 810 * generation functionality. 811 * 812 * RETURNS: 813 * 814 * 0 on success or a negative error code on failure. 815 */ 816 int (*verify_crc_source)(struct drm_crtc *crtc, const char *source, 817 size_t *values_cnt); 818 /** 819 * @get_crc_sources: 820 * 821 * Driver callback for getting a list of all the available sources for 822 * CRC generation. This callback depends upon verify_crc_source, So 823 * verify_crc_source callback should be implemented before implementing 824 * this. Driver can pass full list of available crc sources, this 825 * callback does the verification on each crc-source before passing it 826 * to userspace. 827 * 828 * This callback is optional if the driver does not support exporting of 829 * possible CRC sources list. 830 * 831 * RETURNS: 832 * 833 * a constant character pointer to the list of all the available CRC 834 * sources. On failure driver should return NULL. count should be 835 * updated with number of sources in list. if zero we don't process any 836 * source from the list. 837 */ 838 const char *const *(*get_crc_sources)(struct drm_crtc *crtc, 839 size_t *count); 840 841 /** 842 * @atomic_print_state: 843 * 844 * If driver subclasses &struct drm_crtc_state, it should implement 845 * this optional hook for printing additional driver specific state. 846 * 847 * Do not call this directly, use drm_atomic_crtc_print_state() 848 * instead. 849 */ 850 void (*atomic_print_state)(struct drm_printer *p, 851 const struct drm_crtc_state *state); 852 853 /** 854 * @get_vblank_counter: 855 * 856 * Driver callback for fetching a raw hardware vblank counter for the 857 * CRTC. It's meant to be used by new drivers as the replacement of 858 * &drm_driver.get_vblank_counter hook. 859 * 860 * This callback is optional. If a device doesn't have a hardware 861 * counter, the driver can simply leave the hook as NULL. The DRM core 862 * will account for missed vblank events while interrupts where disabled 863 * based on system timestamps. 864 * 865 * Wraparound handling and loss of events due to modesetting is dealt 866 * with in the DRM core code, as long as drivers call 867 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or 868 * enabling a CRTC. 869 * 870 * See also &drm_device.vblank_disable_immediate and 871 * &drm_device.max_vblank_count. 872 * 873 * Returns: 874 * 875 * Raw vblank counter value. 876 */ 877 u32 (*get_vblank_counter)(struct drm_crtc *crtc); 878 879 /** 880 * @enable_vblank: 881 * 882 * Enable vblank interrupts for the CRTC. It's meant to be used by 883 * new drivers as the replacement of &drm_driver.enable_vblank hook. 884 * 885 * Returns: 886 * 887 * Zero on success, appropriate errno if the vblank interrupt cannot 888 * be enabled. 889 */ 890 int (*enable_vblank)(struct drm_crtc *crtc); 891 892 /** 893 * @disable_vblank: 894 * 895 * Disable vblank interrupts for the CRTC. It's meant to be used by 896 * new drivers as the replacement of &drm_driver.disable_vblank hook. 897 */ 898 void (*disable_vblank)(struct drm_crtc *crtc); 899 900 /** 901 * @get_vblank_timestamp: 902 * 903 * Called by drm_get_last_vbltimestamp(). Should return a precise 904 * timestamp when the most recent vblank interval ended or will end. 905 * 906 * Specifically, the timestamp in @vblank_time should correspond as 907 * closely as possible to the time when the first video scanline of 908 * the video frame after the end of vblank will start scanning out, 909 * the time immediately after end of the vblank interval. If the 910 * @crtc is currently inside vblank, this will be a time in the future. 911 * If the @crtc is currently scanning out a frame, this will be the 912 * past start time of the current scanout. This is meant to adhere 913 * to the OpenML OML_sync_control extension specification. 914 * 915 * Parameters: 916 * 917 * crtc: 918 * CRTC for which timestamp should be returned. 919 * max_error: 920 * Maximum allowable timestamp error in nanoseconds. 921 * Implementation should strive to provide timestamp 922 * with an error of at most max_error nanoseconds. 923 * Returns true upper bound on error for timestamp. 924 * vblank_time: 925 * Target location for returned vblank timestamp. 926 * in_vblank_irq: 927 * True when called from drm_crtc_handle_vblank(). Some drivers 928 * need to apply some workarounds for gpu-specific vblank irq quirks 929 * if flag is set. 930 * 931 * Returns: 932 * 933 * True on success, false on failure, which means the core should 934 * fallback to a simple timestamp taken in drm_crtc_handle_vblank(). 935 */ 936 bool (*get_vblank_timestamp)(struct drm_crtc *crtc, 937 int *max_error, 938 ktime_t *vblank_time, 939 bool in_vblank_irq); 940 }; 941 942 /** 943 * struct drm_crtc - central CRTC control structure 944 * 945 * Each CRTC may have one or more connectors associated with it. This structure 946 * allows the CRTC to be controlled. 947 */ 948 struct drm_crtc { 949 /** @dev: parent DRM device */ 950 struct drm_device *dev; 951 /** @port: OF node used by drm_of_find_possible_crtcs(). */ 952 struct device_node *port; 953 /** 954 * @head: 955 * 956 * List of all CRTCs on @dev, linked from &drm_mode_config.crtc_list. 957 * Invariant over the lifetime of @dev and therefore does not need 958 * locking. 959 */ 960 struct list_head head; 961 962 /** @name: human readable name, can be overwritten by the driver */ 963 char *name; 964 965 /** 966 * @mutex: 967 * 968 * This provides a read lock for the overall CRTC state (mode, dpms 969 * state, ...) and a write lock for everything which can be update 970 * without a full modeset (fb, cursor data, CRTC properties ...). A full 971 * modeset also need to grab &drm_mode_config.connection_mutex. 972 * 973 * For atomic drivers specifically this protects @state. 974 */ 975 struct drm_modeset_lock mutex; 976 977 /** @base: base KMS object for ID tracking etc. */ 978 struct drm_mode_object base; 979 980 /** 981 * @primary: 982 * Primary plane for this CRTC. Note that this is only 983 * relevant for legacy IOCTL, it specifies the plane implicitly used by 984 * the SETCRTC and PAGE_FLIP IOCTLs. It does not have any significance 985 * beyond that. 986 */ 987 struct drm_plane *primary; 988 989 /** 990 * @cursor: 991 * Cursor plane for this CRTC. Note that this is only relevant for 992 * legacy IOCTL, it specifies the plane implicitly used by the SETCURSOR 993 * and SETCURSOR2 IOCTLs. It does not have any significance 994 * beyond that. 995 */ 996 struct drm_plane *cursor; 997 998 /** 999 * @index: Position inside the mode_config.list, can be used as an array 1000 * index. It is invariant over the lifetime of the CRTC. 1001 */ 1002 unsigned index; 1003 1004 /** 1005 * @cursor_x: Current x position of the cursor, used for universal 1006 * cursor planes because the SETCURSOR IOCTL only can update the 1007 * framebuffer without supplying the coordinates. Drivers should not use 1008 * this directly, atomic drivers should look at &drm_plane_state.crtc_x 1009 * of the cursor plane instead. 1010 */ 1011 int cursor_x; 1012 /** 1013 * @cursor_y: Current y position of the cursor, used for universal 1014 * cursor planes because the SETCURSOR IOCTL only can update the 1015 * framebuffer without supplying the coordinates. Drivers should not use 1016 * this directly, atomic drivers should look at &drm_plane_state.crtc_y 1017 * of the cursor plane instead. 1018 */ 1019 int cursor_y; 1020 1021 /** 1022 * @enabled: 1023 * 1024 * Is this CRTC enabled? Should only be used by legacy drivers, atomic 1025 * drivers should instead consult &drm_crtc_state.enable and 1026 * &drm_crtc_state.active. Atomic drivers can update this by calling 1027 * drm_atomic_helper_update_legacy_modeset_state(). 1028 */ 1029 bool enabled; 1030 1031 /** 1032 * @mode: 1033 * 1034 * Current mode timings. Should only be used by legacy drivers, atomic 1035 * drivers should instead consult &drm_crtc_state.mode. Atomic drivers 1036 * can update this by calling 1037 * drm_atomic_helper_update_legacy_modeset_state(). 1038 */ 1039 struct drm_display_mode mode; 1040 1041 /** 1042 * @hwmode: 1043 * 1044 * Programmed mode in hw, after adjustments for encoders, crtc, panel 1045 * scaling etc. Should only be used by legacy drivers, for high 1046 * precision vblank timestamps in 1047 * drm_crtc_vblank_helper_get_vblank_timestamp(). 1048 * 1049 * Note that atomic drivers should not use this, but instead use 1050 * &drm_crtc_state.adjusted_mode. And for high-precision timestamps 1051 * drm_crtc_vblank_helper_get_vblank_timestamp() used 1052 * &drm_vblank_crtc.hwmode, 1053 * which is filled out by calling drm_calc_timestamping_constants(). 1054 */ 1055 struct drm_display_mode hwmode; 1056 1057 /** 1058 * @x: 1059 * x position on screen. Should only be used by legacy drivers, atomic 1060 * drivers should look at &drm_plane_state.crtc_x of the primary plane 1061 * instead. Updated by calling 1062 * drm_atomic_helper_update_legacy_modeset_state(). 1063 */ 1064 int x; 1065 /** 1066 * @y: 1067 * y position on screen. Should only be used by legacy drivers, atomic 1068 * drivers should look at &drm_plane_state.crtc_y of the primary plane 1069 * instead. Updated by calling 1070 * drm_atomic_helper_update_legacy_modeset_state(). 1071 */ 1072 int y; 1073 1074 /** @funcs: CRTC control functions */ 1075 const struct drm_crtc_funcs *funcs; 1076 1077 /** 1078 * @gamma_size: Size of legacy gamma ramp reported to userspace. Set up 1079 * by calling drm_mode_crtc_set_gamma_size(). 1080 * 1081 * Note that atomic drivers need to instead use 1082 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt(). 1083 */ 1084 uint32_t gamma_size; 1085 1086 /** 1087 * @gamma_store: Gamma ramp values used by the legacy SETGAMMA and 1088 * GETGAMMA IOCTls. Set up by calling drm_mode_crtc_set_gamma_size(). 1089 * 1090 * Note that atomic drivers need to instead use 1091 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt(). 1092 */ 1093 uint16_t *gamma_store; 1094 1095 /** @helper_private: mid-layer private data */ 1096 const struct drm_crtc_helper_funcs *helper_private; 1097 1098 /** @properties: property tracking for this CRTC */ 1099 struct drm_object_properties properties; 1100 1101 /** 1102 * @scaling_filter_property: property to apply a particular filter while 1103 * scaling. 1104 */ 1105 struct drm_property *scaling_filter_property; 1106 1107 /** 1108 * @state: 1109 * 1110 * Current atomic state for this CRTC. 1111 * 1112 * This is protected by @mutex. Note that nonblocking atomic commits 1113 * access the current CRTC state without taking locks. Either by going 1114 * through the &struct drm_atomic_state pointers, see 1115 * for_each_oldnew_crtc_in_state(), for_each_old_crtc_in_state() and 1116 * for_each_new_crtc_in_state(). Or through careful ordering of atomic 1117 * commit operations as implemented in the atomic helpers, see 1118 * &struct drm_crtc_commit. 1119 */ 1120 struct drm_crtc_state *state; 1121 1122 /** 1123 * @commit_list: 1124 * 1125 * List of &drm_crtc_commit structures tracking pending commits. 1126 * Protected by @commit_lock. This list holds its own full reference, 1127 * as does the ongoing commit. 1128 * 1129 * "Note that the commit for a state change is also tracked in 1130 * &drm_crtc_state.commit. For accessing the immediately preceding 1131 * commit in an atomic update it is recommended to just use that 1132 * pointer in the old CRTC state, since accessing that doesn't need 1133 * any locking or list-walking. @commit_list should only be used to 1134 * stall for framebuffer cleanup that's signalled through 1135 * &drm_crtc_commit.cleanup_done." 1136 */ 1137 struct list_head commit_list; 1138 1139 /** 1140 * @commit_lock: 1141 * 1142 * Spinlock to protect @commit_list. 1143 */ 1144 spinlock_t commit_lock; 1145 1146 /** 1147 * @debugfs_entry: 1148 * 1149 * Debugfs directory for this CRTC. 1150 */ 1151 struct dentry *debugfs_entry; 1152 1153 /** 1154 * @crc: 1155 * 1156 * Configuration settings of CRC capture. 1157 */ 1158 struct drm_crtc_crc crc; 1159 1160 /** 1161 * @fence_context: 1162 * 1163 * timeline context used for fence operations. 1164 */ 1165 unsigned int fence_context; 1166 1167 /** 1168 * @fence_lock: 1169 * 1170 * spinlock to protect the fences in the fence_context. 1171 */ 1172 spinlock_t fence_lock; 1173 /** 1174 * @fence_seqno: 1175 * 1176 * Seqno variable used as monotonic counter for the fences 1177 * created on the CRTC's timeline. 1178 */ 1179 unsigned long fence_seqno; 1180 1181 /** 1182 * @timeline_name: 1183 * 1184 * The name of the CRTC's fence timeline. 1185 */ 1186 char timeline_name[32]; 1187 1188 /** 1189 * @self_refresh_data: Holds the state for the self refresh helpers 1190 * 1191 * Initialized via drm_self_refresh_helper_init(). 1192 */ 1193 struct drm_self_refresh_data *self_refresh_data; 1194 }; 1195 1196 /** 1197 * struct drm_mode_set - new values for a CRTC config change 1198 * @fb: framebuffer to use for new config 1199 * @crtc: CRTC whose configuration we're about to change 1200 * @mode: mode timings to use 1201 * @x: position of this CRTC relative to @fb 1202 * @y: position of this CRTC relative to @fb 1203 * @connectors: array of connectors to drive with this CRTC if possible 1204 * @num_connectors: size of @connectors array 1205 * 1206 * This represents a modeset configuration for the legacy SETCRTC ioctl and is 1207 * also used internally. Atomic drivers instead use &drm_atomic_state. 1208 */ 1209 struct drm_mode_set { 1210 struct drm_framebuffer *fb; 1211 struct drm_crtc *crtc; 1212 struct drm_display_mode *mode; 1213 1214 uint32_t x; 1215 uint32_t y; 1216 1217 struct drm_connector **connectors; 1218 size_t num_connectors; 1219 }; 1220 1221 #define obj_to_crtc(x) container_of(x, struct drm_crtc, base) 1222 1223 __printf(6, 7) 1224 int drm_crtc_init_with_planes(struct drm_device *dev, 1225 struct drm_crtc *crtc, 1226 struct drm_plane *primary, 1227 struct drm_plane *cursor, 1228 const struct drm_crtc_funcs *funcs, 1229 const char *name, ...); 1230 void drm_crtc_cleanup(struct drm_crtc *crtc); 1231 1232 __printf(7, 8) 1233 void *__drmm_crtc_alloc_with_planes(struct drm_device *dev, 1234 size_t size, size_t offset, 1235 struct drm_plane *primary, 1236 struct drm_plane *cursor, 1237 const struct drm_crtc_funcs *funcs, 1238 const char *name, ...); 1239 1240 /** 1241 * drmm_crtc_alloc_with_planes - Allocate and initialize a new CRTC object with 1242 * specified primary and cursor planes. 1243 * @dev: DRM device 1244 * @type: the type of the struct which contains struct &drm_crtc 1245 * @member: the name of the &drm_crtc within @type. 1246 * @primary: Primary plane for CRTC 1247 * @cursor: Cursor plane for CRTC 1248 * @funcs: callbacks for the new CRTC 1249 * @name: printf style format string for the CRTC name, or NULL for default name 1250 * 1251 * Allocates and initializes a new crtc object. Cleanup is automatically 1252 * handled through registering drmm_crtc_cleanup() with drmm_add_action(). 1253 * 1254 * The @drm_crtc_funcs.destroy hook must be NULL. 1255 * 1256 * Returns: 1257 * Pointer to new crtc, or ERR_PTR on failure. 1258 */ 1259 #define drmm_crtc_alloc_with_planes(dev, type, member, primary, cursor, funcs, name, ...) \ 1260 ((type *)__drmm_crtc_alloc_with_planes(dev, sizeof(type), \ 1261 offsetof(type, member), \ 1262 primary, cursor, funcs, \ 1263 name, ##__VA_ARGS__)) 1264 1265 /** 1266 * drm_crtc_index - find the index of a registered CRTC 1267 * @crtc: CRTC to find index for 1268 * 1269 * Given a registered CRTC, return the index of that CRTC within a DRM 1270 * device's list of CRTCs. 1271 */ 1272 static inline unsigned int drm_crtc_index(const struct drm_crtc *crtc) 1273 { 1274 return crtc->index; 1275 } 1276 1277 /** 1278 * drm_crtc_mask - find the mask of a registered CRTC 1279 * @crtc: CRTC to find mask for 1280 * 1281 * Given a registered CRTC, return the mask bit of that CRTC for the 1282 * &drm_encoder.possible_crtcs and &drm_plane.possible_crtcs fields. 1283 */ 1284 static inline uint32_t drm_crtc_mask(const struct drm_crtc *crtc) 1285 { 1286 return 1 << drm_crtc_index(crtc); 1287 } 1288 1289 int drm_mode_set_config_internal(struct drm_mode_set *set); 1290 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx); 1291 1292 /** 1293 * drm_crtc_find - look up a CRTC object from its ID 1294 * @dev: DRM device 1295 * @file_priv: drm file to check for lease against. 1296 * @id: &drm_mode_object ID 1297 * 1298 * This can be used to look up a CRTC from its userspace ID. Only used by 1299 * drivers for legacy IOCTLs and interface, nowadays extensions to the KMS 1300 * userspace interface should be done using &drm_property. 1301 */ 1302 static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev, 1303 struct drm_file *file_priv, 1304 uint32_t id) 1305 { 1306 struct drm_mode_object *mo; 1307 mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CRTC); 1308 return mo ? obj_to_crtc(mo) : NULL; 1309 } 1310 1311 /** 1312 * drm_for_each_crtc - iterate over all CRTCs 1313 * @crtc: a &struct drm_crtc as the loop cursor 1314 * @dev: the &struct drm_device 1315 * 1316 * Iterate over all CRTCs of @dev. 1317 */ 1318 #define drm_for_each_crtc(crtc, dev) \ 1319 list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head) 1320 1321 /** 1322 * drm_for_each_crtc_reverse - iterate over all CRTCs in reverse order 1323 * @crtc: a &struct drm_crtc as the loop cursor 1324 * @dev: the &struct drm_device 1325 * 1326 * Iterate over all CRTCs of @dev. 1327 */ 1328 #define drm_for_each_crtc_reverse(crtc, dev) \ 1329 list_for_each_entry_reverse(crtc, &(dev)->mode_config.crtc_list, head) 1330 1331 int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc, 1332 unsigned int supported_filters); 1333 1334 #endif /* __DRM_CRTC_H__ */ 1335