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