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