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