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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 */
81struct 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;
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 * @background_color:
279 *
280 * RGB value representing the CRTC's background color. The background
281 * color (aka "canvas color") of a CRTC is the color that will be used
282 * for pixels not covered by a plane, or covered by transparent pixels
283 * of a plane. The value here should be built using DRM_ARGB64_PREP*()
284 * helpers, while the individual color components can be extracted with
285 * desired precision via the DRM_ARGB64_GET*() macros.
286 */
287 u64 background_color;
288
289 /**
290 * @target_vblank:
291 *
292 * Target vertical blank period when a page flip
293 * should take effect.
294 */
295 u32 target_vblank;
296
297 /**
298 * @async_flip:
299 *
300 * This is set when DRM_MODE_PAGE_FLIP_ASYNC is set in the legacy
301 * PAGE_FLIP IOCTL. It's not wired up for the atomic IOCTL itself yet.
302 */
303 bool async_flip;
304
305 /**
306 * @vrr_enabled:
307 *
308 * Indicates if variable refresh rate should be enabled for the CRTC.
309 * Support for the requested vrr state will depend on driver and
310 * hardware capabiltiy - lacking support is not treated as failure.
311 */
312 bool vrr_enabled;
313
314 /**
315 * @self_refresh_active:
316 *
317 * Used by the self refresh helpers to denote when a self refresh
318 * transition is occurring. This will be set on enable/disable callbacks
319 * when self refresh is being enabled or disabled. In some cases, it may
320 * not be desirable to fully shut off the crtc during self refresh.
321 * CRTC's can inspect this flag and determine the best course of action.
322 */
323 bool self_refresh_active;
324
325 /**
326 * @scaling_filter:
327 *
328 * Scaling filter to be applied
329 */
330 enum drm_scaling_filter scaling_filter;
331
332 /**
333 * @sharpness_strength:
334 *
335 * Used by the user to set the sharpness intensity.
336 * The value ranges from 0-255.
337 * Default value is 0 which disable the sharpness feature.
338 * Any value greater than 0 enables sharpening with the
339 * specified strength.
340 */
341 u8 sharpness_strength;
342
343 /**
344 * @event:
345 *
346 * Optional pointer to a DRM event to signal upon completion of the
347 * state update. The driver must send out the event when the atomic
348 * commit operation completes. There are two cases:
349 *
350 * - The event is for a CRTC which is being disabled through this
351 * atomic commit. In that case the event can be send out any time
352 * after the hardware has stopped scanning out the current
353 * framebuffers. It should contain the timestamp and counter for the
354 * last vblank before the display pipeline was shut off. The simplest
355 * way to achieve that is calling drm_crtc_send_vblank_event()
356 * somewhen after drm_crtc_vblank_off() has been called.
357 *
358 * - For a CRTC which is enabled at the end of the commit (even when it
359 * undergoes an full modeset) the vblank timestamp and counter must
360 * be for the vblank right before the first frame that scans out the
361 * new set of buffers. Again the event can only be sent out after the
362 * hardware has stopped scanning out the old buffers.
363 *
364 * - Events for disabled CRTCs are not allowed, and drivers can ignore
365 * that case.
366 *
367 * For very simple hardware without VBLANK interrupt, enabling
368 * &struct drm_crtc_state.no_vblank makes DRM's atomic commit helpers
369 * send a fake VBLANK event at the end of the display update after all
370 * hardware changes have been applied. See
371 * drm_atomic_helper_fake_vblank().
372 *
373 * For more complex hardware this
374 * can be handled by the drm_crtc_send_vblank_event() function,
375 * which the driver should call on the provided event upon completion of
376 * the atomic commit. Note that if the driver supports vblank signalling
377 * and timestamping the vblank counters and timestamps must agree with
378 * the ones returned from page flip events. With the current vblank
379 * helper infrastructure this can be achieved by holding a vblank
380 * reference while the page flip is pending, acquired through
381 * drm_crtc_vblank_get() and released with drm_crtc_vblank_put().
382 * Drivers are free to implement their own vblank counter and timestamp
383 * tracking though, e.g. if they have accurate timestamp registers in
384 * hardware.
385 *
386 * For hardware which supports some means to synchronize vblank
387 * interrupt delivery with committing display state there's also
388 * drm_crtc_arm_vblank_event(). See the documentation of that function
389 * for a detailed discussion of the constraints it needs to be used
390 * safely.
391 *
392 * If the device can't notify of flip completion in a race-free way
393 * at all, then the event should be armed just after the page flip is
394 * committed. In the worst case the driver will send the event to
395 * userspace one frame too late. This doesn't allow for a real atomic
396 * update, but it should avoid tearing.
397 */
398 struct drm_pending_vblank_event *event;
399
400 /**
401 * @commit:
402 *
403 * This tracks how the commit for this update proceeds through the
404 * various phases. This is never cleared, except when we destroy the
405 * state, so that subsequent commits can synchronize with previous ones.
406 */
407 struct drm_crtc_commit *commit;
408
409 /** @state: backpointer to global drm_atomic_state */
410 struct drm_atomic_state *state;
411};
412
413/**
414 * struct drm_crtc_funcs - control CRTCs for a given device
415 *
416 * The drm_crtc_funcs structure is the central CRTC management structure
417 * in the DRM. Each CRTC controls one or more connectors (note that the name
418 * CRTC is simply historical, a CRTC may control LVDS, VGA, DVI, TV out, etc.
419 * connectors, not just CRTs).
420 *
421 * Each driver is responsible for filling out this structure at startup time,
422 * in addition to providing other modesetting features, like i2c and DDC
423 * bus accessors.
424 */
425struct drm_crtc_funcs {
426 /**
427 * @reset:
428 *
429 * Reset CRTC hardware and software state to off. This function isn't
430 * called by the core directly, only through drm_mode_config_reset().
431 * It's not a helper hook only for historical reasons.
432 *
433 * Atomic drivers can use drm_atomic_helper_crtc_reset() to reset
434 * atomic state using this hook.
435 */
436 void (*reset)(struct drm_crtc *crtc);
437
438 /**
439 * @cursor_set:
440 *
441 * Update the cursor image. The cursor position is relative to the CRTC
442 * and can be partially or fully outside of the visible area.
443 *
444 * Note that contrary to all other KMS functions the legacy cursor entry
445 * points don't take a framebuffer object, but instead take directly a
446 * raw buffer object id from the driver's buffer manager (which is
447 * either GEM or TTM for current drivers).
448 *
449 * This entry point is deprecated, drivers should instead implement
450 * universal plane support and register a proper cursor plane using
451 * drm_crtc_init_with_planes().
452 *
453 * This callback is optional
454 *
455 * RETURNS:
456 *
457 * 0 on success or a negative error code on failure.
458 */
459 int (*cursor_set)(struct drm_crtc *crtc, struct drm_file *file_priv,
460 uint32_t handle, uint32_t width, uint32_t height);
461
462 /**
463 * @cursor_set2:
464 *
465 * Update the cursor image, including hotspot information. The hotspot
466 * must not affect the cursor position in CRTC coordinates, but is only
467 * meant as a hint for virtualized display hardware to coordinate the
468 * guests and hosts cursor position. The cursor hotspot is relative to
469 * the cursor image. Otherwise this works exactly like @cursor_set.
470 *
471 * This entry point is deprecated, drivers should instead implement
472 * universal plane support and register a proper cursor plane using
473 * drm_crtc_init_with_planes().
474 *
475 * This callback is optional.
476 *
477 * RETURNS:
478 *
479 * 0 on success or a negative error code on failure.
480 */
481 int (*cursor_set2)(struct drm_crtc *crtc, struct drm_file *file_priv,
482 uint32_t handle, uint32_t width, uint32_t height,
483 int32_t hot_x, int32_t hot_y);
484
485 /**
486 * @cursor_move:
487 *
488 * Update the cursor position. The cursor does not need to be visible
489 * when this hook is called.
490 *
491 * This entry point is deprecated, drivers should instead implement
492 * universal plane support and register a proper cursor plane using
493 * drm_crtc_init_with_planes().
494 *
495 * This callback is optional.
496 *
497 * RETURNS:
498 *
499 * 0 on success or a negative error code on failure.
500 */
501 int (*cursor_move)(struct drm_crtc *crtc, int x, int y);
502
503 /**
504 * @gamma_set:
505 *
506 * Set gamma on the CRTC.
507 *
508 * This callback is optional.
509 *
510 * Atomic drivers who want to support gamma tables should implement the
511 * atomic color management support, enabled by calling
512 * drm_crtc_enable_color_mgmt(), which then supports the legacy gamma
513 * interface through the drm_atomic_helper_legacy_gamma_set()
514 * compatibility implementation.
515 */
516 int (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
517 uint32_t size,
518 struct drm_modeset_acquire_ctx *ctx);
519
520 /**
521 * @destroy:
522 *
523 * Clean up CRTC resources. This is only called at driver unload time
524 * through drm_mode_config_cleanup() since a CRTC cannot be hotplugged
525 * in DRM.
526 */
527 void (*destroy)(struct drm_crtc *crtc);
528
529 /**
530 * @set_config:
531 *
532 * This is the main legacy entry point to change the modeset state on a
533 * CRTC. All the details of the desired configuration are passed in a
534 * &struct drm_mode_set - see there for details.
535 *
536 * Drivers implementing atomic modeset should use
537 * drm_atomic_helper_set_config() to implement this hook.
538 *
539 * RETURNS:
540 *
541 * 0 on success or a negative error code on failure.
542 */
543 int (*set_config)(struct drm_mode_set *set,
544 struct drm_modeset_acquire_ctx *ctx);
545
546 /**
547 * @page_flip:
548 *
549 * Legacy entry point to schedule a flip to the given framebuffer.
550 *
551 * Page flipping is a synchronization mechanism that replaces the frame
552 * buffer being scanned out by the CRTC with a new frame buffer during
553 * vertical blanking, avoiding tearing (except when requested otherwise
554 * through the DRM_MODE_PAGE_FLIP_ASYNC flag). When an application
555 * requests a page flip the DRM core verifies that the new frame buffer
556 * is large enough to be scanned out by the CRTC in the currently
557 * configured mode and then calls this hook with a pointer to the new
558 * frame buffer.
559 *
560 * The driver must wait for any pending rendering to the new framebuffer
561 * to complete before executing the flip. It should also wait for any
562 * pending rendering from other drivers if the underlying buffer is a
563 * shared dma-buf.
564 *
565 * An application can request to be notified when the page flip has
566 * completed. The drm core will supply a &struct drm_event in the event
567 * parameter in this case. This can be handled by the
568 * drm_crtc_send_vblank_event() function, which the driver should call on
569 * the provided event upon completion of the flip. Note that if
570 * the driver supports vblank signalling and timestamping the vblank
571 * counters and timestamps must agree with the ones returned from page
572 * flip events. With the current vblank helper infrastructure this can
573 * be achieved by holding a vblank reference while the page flip is
574 * pending, acquired through drm_crtc_vblank_get() and released with
575 * drm_crtc_vblank_put(). Drivers are free to implement their own vblank
576 * counter and timestamp tracking though, e.g. if they have accurate
577 * timestamp registers in hardware.
578 *
579 * This callback is optional.
580 *
581 * NOTE:
582 *
583 * Very early versions of the KMS ABI mandated that the driver must
584 * block (but not reject) any rendering to the old framebuffer until the
585 * flip operation has completed and the old framebuffer is no longer
586 * visible. This requirement has been lifted, and userspace is instead
587 * expected to request delivery of an event and wait with recycling old
588 * buffers until such has been received.
589 *
590 * RETURNS:
591 *
592 * 0 on success or a negative error code on failure. Note that if a
593 * page flip operation is already pending the callback should return
594 * -EBUSY. Pageflips on a disabled CRTC (either by setting a NULL mode
595 * or just runtime disabled through DPMS respectively the new atomic
596 * "ACTIVE" state) should result in an -EINVAL error code. Note that
597 * drm_atomic_helper_page_flip() checks this already for atomic drivers.
598 */
599 int (*page_flip)(struct drm_crtc *crtc,
600 struct drm_framebuffer *fb,
601 struct drm_pending_vblank_event *event,
602 uint32_t flags,
603 struct drm_modeset_acquire_ctx *ctx);
604
605 /**
606 * @page_flip_target:
607 *
608 * Same as @page_flip but with an additional parameter specifying the
609 * absolute target vertical blank period (as reported by
610 * drm_crtc_vblank_count()) when the flip should take effect.
611 *
612 * Note that the core code calls drm_crtc_vblank_get before this entry
613 * point, and will call drm_crtc_vblank_put if this entry point returns
614 * any non-0 error code. It's the driver's responsibility to call
615 * drm_crtc_vblank_put after this entry point returns 0, typically when
616 * the flip completes.
617 */
618 int (*page_flip_target)(struct drm_crtc *crtc,
619 struct drm_framebuffer *fb,
620 struct drm_pending_vblank_event *event,
621 uint32_t flags, uint32_t target,
622 struct drm_modeset_acquire_ctx *ctx);
623
624 /**
625 * @set_property:
626 *
627 * This is the legacy entry point to update a property attached to the
628 * CRTC.
629 *
630 * This callback is optional if the driver does not support any legacy
631 * driver-private properties. For atomic drivers it is not used because
632 * property handling is done entirely in the DRM core.
633 *
634 * RETURNS:
635 *
636 * 0 on success or a negative error code on failure.
637 */
638 int (*set_property)(struct drm_crtc *crtc,
639 struct drm_property *property, uint64_t val);
640
641 /**
642 * @atomic_duplicate_state:
643 *
644 * Duplicate the current atomic state for this CRTC and return it.
645 * The core and helpers guarantee that any atomic state duplicated with
646 * this hook and still owned by the caller (i.e. not transferred to the
647 * driver by calling &drm_mode_config_funcs.atomic_commit) will be
648 * cleaned up by calling the @atomic_destroy_state hook in this
649 * structure.
650 *
651 * This callback is mandatory for atomic drivers.
652 *
653 * Atomic drivers which don't subclass &struct drm_crtc_state should use
654 * drm_atomic_helper_crtc_duplicate_state(). Drivers that subclass the
655 * state structure to extend it with driver-private state should use
656 * __drm_atomic_helper_crtc_duplicate_state() to make sure shared state is
657 * duplicated in a consistent fashion across drivers.
658 *
659 * It is an error to call this hook before &drm_crtc.state has been
660 * initialized correctly.
661 *
662 * NOTE:
663 *
664 * If the duplicate state references refcounted resources this hook must
665 * acquire a reference for each of them. The driver must release these
666 * references again in @atomic_destroy_state.
667 *
668 * RETURNS:
669 *
670 * Duplicated atomic state or NULL when the allocation failed.
671 */
672 struct drm_crtc_state *(*atomic_duplicate_state)(struct drm_crtc *crtc);
673
674 /**
675 * @atomic_destroy_state:
676 *
677 * Destroy a state duplicated with @atomic_duplicate_state and release
678 * or unreference all resources it references
679 *
680 * This callback is mandatory for atomic drivers.
681 */
682 void (*atomic_destroy_state)(struct drm_crtc *crtc,
683 struct drm_crtc_state *state);
684
685 /**
686 * @atomic_set_property:
687 *
688 * Decode a driver-private property value and store the decoded value
689 * into the passed-in state structure. Since the atomic core decodes all
690 * standardized properties (even for extensions beyond the core set of
691 * properties which might not be implemented by all drivers) this
692 * requires drivers to subclass the state structure.
693 *
694 * Such driver-private properties should really only be implemented for
695 * truly hardware/vendor specific state. Instead it is preferred to
696 * standardize atomic extension and decode the properties used to expose
697 * such an extension in the core.
698 *
699 * Do not call this function directly, use
700 * drm_atomic_crtc_set_property() instead.
701 *
702 * This callback is optional if the driver does not support any
703 * driver-private atomic properties.
704 *
705 * NOTE:
706 *
707 * This function is called in the state assembly phase of atomic
708 * modesets, which can be aborted for any reason (including on
709 * userspace's request to just check whether a configuration would be
710 * possible). Drivers MUST NOT touch any persistent state (hardware or
711 * software) or data structures except the passed in @state parameter.
712 *
713 * Also since userspace controls in which order properties are set this
714 * function must not do any input validation (since the state update is
715 * incomplete and hence likely inconsistent). Instead any such input
716 * validation must be done in the various atomic_check callbacks.
717 *
718 * RETURNS:
719 *
720 * 0 if the property has been found, -EINVAL if the property isn't
721 * implemented by the driver (which should never happen, the core only
722 * asks for properties attached to this CRTC). No other validation is
723 * allowed by the driver. The core already checks that the property
724 * value is within the range (integer, valid enum value, ...) the driver
725 * set when registering the property.
726 */
727 int (*atomic_set_property)(struct drm_crtc *crtc,
728 struct drm_crtc_state *state,
729 struct drm_property *property,
730 uint64_t val);
731 /**
732 * @atomic_get_property:
733 *
734 * Reads out the decoded driver-private property. This is used to
735 * implement the GETCRTC IOCTL.
736 *
737 * Do not call this function directly, use
738 * drm_atomic_crtc_get_property() instead.
739 *
740 * This callback is optional if the driver does not support any
741 * driver-private atomic properties.
742 *
743 * RETURNS:
744 *
745 * 0 on success, -EINVAL if the property isn't implemented by the
746 * driver (which should never happen, the core only asks for
747 * properties attached to this CRTC).
748 */
749 int (*atomic_get_property)(struct drm_crtc *crtc,
750 const struct drm_crtc_state *state,
751 struct drm_property *property,
752 uint64_t *val);
753
754 /**
755 * @late_register:
756 *
757 * This optional hook can be used to register additional userspace
758 * interfaces attached to the crtc like debugfs interfaces.
759 * It is called late in the driver load sequence from drm_dev_register().
760 * Everything added from this callback should be unregistered in
761 * the early_unregister callback.
762 *
763 * Returns:
764 *
765 * 0 on success, or a negative error code on failure.
766 */
767 int (*late_register)(struct drm_crtc *crtc);
768
769 /**
770 * @early_unregister:
771 *
772 * This optional hook should be used to unregister the additional
773 * userspace interfaces attached to the crtc from
774 * @late_register. It is called from drm_dev_unregister(),
775 * early in the driver unload sequence to disable userspace access
776 * before data structures are torndown.
777 */
778 void (*early_unregister)(struct drm_crtc *crtc);
779
780 /**
781 * @set_crc_source:
782 *
783 * Changes the source of CRC checksums of frames at the request of
784 * userspace, typically for testing purposes. The sources available are
785 * specific of each driver and a %NULL value indicates that CRC
786 * generation is to be switched off.
787 *
788 * When CRC generation is enabled, the driver should call
789 * drm_crtc_add_crc_entry() at each frame, providing any information
790 * that characterizes the frame contents in the crcN arguments, as
791 * provided from the configured source. Drivers must accept an "auto"
792 * source name that will select a default source for this CRTC.
793 *
794 * This may trigger an atomic modeset commit if necessary, to enable CRC
795 * generation.
796 *
797 * Note that "auto" can depend upon the current modeset configuration,
798 * e.g. it could pick an encoder or output specific CRC sampling point.
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 (*set_crc_source)(struct drm_crtc *crtc, const char *source);
808
809 /**
810 * @verify_crc_source:
811 *
812 * verifies the source of CRC checksums of frames before setting the
813 * source for CRC and during crc open. Source parameter can be NULL
814 * while disabling crc source.
815 *
816 * This callback is optional if the driver does not support any CRC
817 * generation functionality.
818 *
819 * RETURNS:
820 *
821 * 0 on success or a negative error code on failure.
822 */
823 int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
824 size_t *values_cnt);
825 /**
826 * @get_crc_sources:
827 *
828 * Driver callback for getting a list of all the available sources for
829 * CRC generation. This callback depends upon verify_crc_source, So
830 * verify_crc_source callback should be implemented before implementing
831 * this. Driver can pass full list of available crc sources, this
832 * callback does the verification on each crc-source before passing it
833 * to userspace.
834 *
835 * This callback is optional if the driver does not support exporting of
836 * possible CRC sources list.
837 *
838 * RETURNS:
839 *
840 * a constant character pointer to the list of all the available CRC
841 * sources. On failure driver should return NULL. count should be
842 * updated with number of sources in list. if zero we don't process any
843 * source from the list.
844 */
845 const char *const *(*get_crc_sources)(struct drm_crtc *crtc,
846 size_t *count);
847
848 /**
849 * @atomic_print_state:
850 *
851 * If driver subclasses &struct drm_crtc_state, it should implement
852 * this optional hook for printing additional driver specific state.
853 *
854 * Do not call this directly, use drm_atomic_crtc_print_state()
855 * instead.
856 */
857 void (*atomic_print_state)(struct drm_printer *p,
858 const struct drm_crtc_state *state);
859
860 /**
861 * @get_vblank_counter:
862 *
863 * Driver callback for fetching a raw hardware vblank counter for the
864 * CRTC. It's meant to be used by new drivers as the replacement of
865 * &drm_driver.get_vblank_counter hook.
866 *
867 * This callback is optional. If a device doesn't have a hardware
868 * counter, the driver can simply leave the hook as NULL. The DRM core
869 * will account for missed vblank events while interrupts where disabled
870 * based on system timestamps.
871 *
872 * Wraparound handling and loss of events due to modesetting is dealt
873 * with in the DRM core code, as long as drivers call
874 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
875 * enabling a CRTC.
876 *
877 * See also &drm_device.vblank_disable_immediate and
878 * &drm_device.max_vblank_count.
879 *
880 * Returns:
881 *
882 * Raw vblank counter value.
883 */
884 u32 (*get_vblank_counter)(struct drm_crtc *crtc);
885
886 /**
887 * @enable_vblank:
888 *
889 * Enable vblank interrupts for the CRTC. It's meant to be used by
890 * new drivers as the replacement of &drm_driver.enable_vblank hook.
891 *
892 * Returns:
893 *
894 * Zero on success, appropriate errno if the vblank interrupt cannot
895 * be enabled.
896 */
897 int (*enable_vblank)(struct drm_crtc *crtc);
898
899 /**
900 * @disable_vblank:
901 *
902 * Disable vblank interrupts for the CRTC. It's meant to be used by
903 * new drivers as the replacement of &drm_driver.disable_vblank hook.
904 */
905 void (*disable_vblank)(struct drm_crtc *crtc);
906
907 /**
908 * @get_vblank_timestamp:
909 *
910 * Called by drm_get_last_vbltimestamp(). Should return a precise
911 * timestamp when the most recent vblank interval ended or will end.
912 *
913 * Specifically, the timestamp in @vblank_time should correspond as
914 * closely as possible to the time when the first video scanline of
915 * the video frame after the end of vblank will start scanning out,
916 * the time immediately after end of the vblank interval. If the
917 * @crtc is currently inside vblank, this will be a time in the future.
918 * If the @crtc is currently scanning out a frame, this will be the
919 * past start time of the current scanout. This is meant to adhere
920 * to the OpenML OML_sync_control extension specification.
921 *
922 * Parameters:
923 *
924 * crtc:
925 * CRTC for which timestamp should be returned.
926 * max_error:
927 * Maximum allowable timestamp error in nanoseconds.
928 * Implementation should strive to provide timestamp
929 * with an error of at most max_error nanoseconds.
930 * Returns true upper bound on error for timestamp.
931 * vblank_time:
932 * Target location for returned vblank timestamp.
933 * in_vblank_irq:
934 * True when called from drm_crtc_handle_vblank(). Some drivers
935 * need to apply some workarounds for gpu-specific vblank irq quirks
936 * if flag is set.
937 *
938 * Returns:
939 *
940 * True on success, false on failure, which means the core should
941 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
942 */
943 bool (*get_vblank_timestamp)(struct drm_crtc *crtc,
944 int *max_error,
945 ktime_t *vblank_time,
946 bool in_vblank_irq);
947};
948
949/**
950 * struct drm_crtc - central CRTC control structure
951 *
952 * Each CRTC may have one or more connectors associated with it. This structure
953 * allows the CRTC to be controlled.
954 */
955struct drm_crtc {
956 /** @dev: parent DRM device */
957 struct drm_device *dev;
958 /** @port: OF node used by drm_of_find_possible_crtcs(). */
959 struct device_node *port;
960 /**
961 * @head:
962 *
963 * List of all CRTCs on @dev, linked from &drm_mode_config.crtc_list.
964 * Invariant over the lifetime of @dev and therefore does not need
965 * locking.
966 */
967 struct list_head head;
968
969 /** @name: human readable name, can be overwritten by the driver */
970 char *name;
971
972 /**
973 * @mutex:
974 *
975 * This provides a read lock for the overall CRTC state (mode, dpms
976 * state, ...) and a write lock for everything which can be update
977 * without a full modeset (fb, cursor data, CRTC properties ...). A full
978 * modeset also need to grab &drm_mode_config.connection_mutex.
979 *
980 * For atomic drivers specifically this protects @state.
981 */
982 struct drm_modeset_lock mutex;
983
984 /** @base: base KMS object for ID tracking etc. */
985 struct drm_mode_object base;
986
987 /**
988 * @primary:
989 * Primary plane for this CRTC. Note that this is only
990 * relevant for legacy IOCTL, it specifies the plane implicitly used by
991 * the SETCRTC and PAGE_FLIP IOCTLs. It does not have any significance
992 * beyond that.
993 */
994 struct drm_plane *primary;
995
996 /**
997 * @cursor:
998 * Cursor plane for this CRTC. Note that this is only relevant for
999 * legacy IOCTL, it specifies the plane implicitly used by the SETCURSOR
1000 * and SETCURSOR2 IOCTLs. It does not have any significance
1001 * beyond that.
1002 */
1003 struct drm_plane *cursor;
1004
1005 /**
1006 * @index: Position inside the mode_config.list, can be used as an array
1007 * index. It is invariant over the lifetime of the CRTC.
1008 */
1009 unsigned index;
1010
1011 /**
1012 * @cursor_x: Current x position of the cursor, used for universal
1013 * cursor planes because the SETCURSOR IOCTL only can update the
1014 * framebuffer without supplying the coordinates. Drivers should not use
1015 * this directly, atomic drivers should look at &drm_plane_state.crtc_x
1016 * of the cursor plane instead.
1017 */
1018 int cursor_x;
1019 /**
1020 * @cursor_y: Current y position of the cursor, used for universal
1021 * cursor planes because the SETCURSOR IOCTL only can update the
1022 * framebuffer without supplying the coordinates. Drivers should not use
1023 * this directly, atomic drivers should look at &drm_plane_state.crtc_y
1024 * of the cursor plane instead.
1025 */
1026 int cursor_y;
1027
1028 /**
1029 * @enabled:
1030 *
1031 * Is this CRTC enabled? Should only be used by legacy drivers, atomic
1032 * drivers should instead consult &drm_crtc_state.enable and
1033 * &drm_crtc_state.active. Atomic drivers can update this by calling
1034 * drm_atomic_helper_update_legacy_modeset_state().
1035 */
1036 bool enabled;
1037
1038 /**
1039 * @mode:
1040 *
1041 * Current mode timings. Should only be used by legacy drivers, atomic
1042 * drivers should instead consult &drm_crtc_state.mode. Atomic drivers
1043 * can update this by calling
1044 * drm_atomic_helper_update_legacy_modeset_state().
1045 */
1046 struct drm_display_mode mode;
1047
1048 /**
1049 * @hwmode:
1050 *
1051 * Programmed mode in hw, after adjustments for encoders, crtc, panel
1052 * scaling etc. Should only be used by legacy drivers, for high
1053 * precision vblank timestamps in
1054 * drm_crtc_vblank_helper_get_vblank_timestamp().
1055 *
1056 * Note that atomic drivers should not use this, but instead use
1057 * &drm_crtc_state.adjusted_mode. And for high-precision timestamps
1058 * drm_crtc_vblank_helper_get_vblank_timestamp() used
1059 * &drm_vblank_crtc.hwmode,
1060 * which is filled out by calling drm_calc_timestamping_constants().
1061 */
1062 struct drm_display_mode hwmode;
1063
1064 /**
1065 * @x:
1066 * x position on screen. Should only be used by legacy drivers, atomic
1067 * drivers should look at &drm_plane_state.crtc_x of the primary plane
1068 * instead. Updated by calling
1069 * drm_atomic_helper_update_legacy_modeset_state().
1070 */
1071 int x;
1072 /**
1073 * @y:
1074 * y position on screen. Should only be used by legacy drivers, atomic
1075 * drivers should look at &drm_plane_state.crtc_y of the primary plane
1076 * instead. Updated by calling
1077 * drm_atomic_helper_update_legacy_modeset_state().
1078 */
1079 int y;
1080
1081 /** @funcs: CRTC control functions */
1082 const struct drm_crtc_funcs *funcs;
1083
1084 /**
1085 * @gamma_size: Size of legacy gamma ramp reported to userspace. Set up
1086 * by calling drm_mode_crtc_set_gamma_size().
1087 *
1088 * Note that atomic drivers need to instead use
1089 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt().
1090 */
1091 uint32_t gamma_size;
1092
1093 /**
1094 * @gamma_store: Gamma ramp values used by the legacy SETGAMMA and
1095 * GETGAMMA IOCTls. Set up by calling drm_mode_crtc_set_gamma_size().
1096 *
1097 * Note that atomic drivers need to instead use
1098 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt().
1099 */
1100 uint16_t *gamma_store;
1101
1102 /** @helper_private: mid-layer private data */
1103 const struct drm_crtc_helper_funcs *helper_private;
1104
1105 /** @properties: property tracking for this CRTC */
1106 struct drm_object_properties properties;
1107
1108 /**
1109 * @scaling_filter_property: property to apply a particular filter while
1110 * scaling.
1111 */
1112 struct drm_property *scaling_filter_property;
1113
1114 /**
1115 * @sharpness_strength_property: property to apply
1116 * the intensity of the sharpness requested.
1117 */
1118 struct drm_property *sharpness_strength_property;
1119
1120 /**
1121 * @state:
1122 *
1123 * Current atomic state for this CRTC.
1124 *
1125 * This is protected by @mutex. Note that nonblocking atomic commits
1126 * access the current CRTC state without taking locks. Either by going
1127 * through the &struct drm_atomic_state pointers, see
1128 * for_each_oldnew_crtc_in_state(), for_each_old_crtc_in_state() and
1129 * for_each_new_crtc_in_state(). Or through careful ordering of atomic
1130 * commit operations as implemented in the atomic helpers, see
1131 * &struct drm_crtc_commit.
1132 */
1133 struct drm_crtc_state *state;
1134
1135 /**
1136 * @commit_list:
1137 *
1138 * List of &drm_crtc_commit structures tracking pending commits.
1139 * Protected by @commit_lock. This list holds its own full reference,
1140 * as does the ongoing commit.
1141 *
1142 * "Note that the commit for a state change is also tracked in
1143 * &drm_crtc_state.commit. For accessing the immediately preceding
1144 * commit in an atomic update it is recommended to just use that
1145 * pointer in the old CRTC state, since accessing that doesn't need
1146 * any locking or list-walking. @commit_list should only be used to
1147 * stall for framebuffer cleanup that's signalled through
1148 * &drm_crtc_commit.cleanup_done."
1149 */
1150 struct list_head commit_list;
1151
1152 /**
1153 * @commit_lock:
1154 *
1155 * Spinlock to protect @commit_list.
1156 */
1157 spinlock_t commit_lock;
1158
1159 /**
1160 * @debugfs_entry:
1161 *
1162 * Debugfs directory for this CRTC.
1163 */
1164 struct dentry *debugfs_entry;
1165
1166 /**
1167 * @crc:
1168 *
1169 * Configuration settings of CRC capture.
1170 */
1171 struct drm_crtc_crc crc;
1172
1173 /**
1174 * @fence_context:
1175 *
1176 * timeline context used for fence operations.
1177 */
1178 unsigned int fence_context;
1179
1180 /**
1181 * @fence_lock:
1182 *
1183 * spinlock to protect the fences in the fence_context.
1184 */
1185 spinlock_t fence_lock;
1186 /**
1187 * @fence_seqno:
1188 *
1189 * Seqno variable used as monotonic counter for the fences
1190 * created on the CRTC's timeline.
1191 */
1192 unsigned long fence_seqno;
1193
1194 /**
1195 * @timeline_name:
1196 *
1197 * The name of the CRTC's fence timeline.
1198 */
1199 char timeline_name[32];
1200
1201 /**
1202 * @self_refresh_data: Holds the state for the self refresh helpers
1203 *
1204 * Initialized via drm_self_refresh_helper_init().
1205 */
1206 struct drm_self_refresh_data *self_refresh_data;
1207};
1208
1209/**
1210 * struct drm_mode_set - new values for a CRTC config change
1211 * @fb: framebuffer to use for new config
1212 * @crtc: CRTC whose configuration we're about to change
1213 * @mode: mode timings to use
1214 * @x: position of this CRTC relative to @fb
1215 * @y: position of this CRTC relative to @fb
1216 * @connectors: array of connectors to drive with this CRTC if possible
1217 * @num_connectors: size of @connectors array
1218 *
1219 * This represents a modeset configuration for the legacy SETCRTC ioctl and is
1220 * also used internally. Atomic drivers instead use &drm_atomic_state.
1221 */
1222struct drm_mode_set {
1223 struct drm_framebuffer *fb;
1224 struct drm_crtc *crtc;
1225 struct drm_display_mode *mode;
1226
1227 uint32_t x;
1228 uint32_t y;
1229
1230 struct drm_connector **connectors;
1231 size_t num_connectors;
1232};
1233
1234#define obj_to_crtc(x) container_of(x, struct drm_crtc, base)
1235
1236__printf(6, 7)
1237int drm_crtc_init_with_planes(struct drm_device *dev,
1238 struct drm_crtc *crtc,
1239 struct drm_plane *primary,
1240 struct drm_plane *cursor,
1241 const struct drm_crtc_funcs *funcs,
1242 const char *name, ...);
1243
1244__printf(6, 7)
1245int drmm_crtc_init_with_planes(struct drm_device *dev,
1246 struct drm_crtc *crtc,
1247 struct drm_plane *primary,
1248 struct drm_plane *cursor,
1249 const struct drm_crtc_funcs *funcs,
1250 const char *name, ...);
1251
1252void drm_crtc_cleanup(struct drm_crtc *crtc);
1253
1254__printf(7, 8)
1255void *__drmm_crtc_alloc_with_planes(struct drm_device *dev,
1256 size_t size, size_t offset,
1257 struct drm_plane *primary,
1258 struct drm_plane *cursor,
1259 const struct drm_crtc_funcs *funcs,
1260 const char *name, ...);
1261
1262/**
1263 * drmm_crtc_alloc_with_planes - Allocate and initialize a new CRTC object with
1264 * specified primary and cursor planes.
1265 * @dev: DRM device
1266 * @type: the type of the struct which contains struct &drm_crtc
1267 * @member: the name of the &drm_crtc within @type.
1268 * @primary: Primary plane for CRTC
1269 * @cursor: Cursor plane for CRTC
1270 * @funcs: callbacks for the new CRTC
1271 * @name: printf style format string for the CRTC name, or NULL for default name
1272 *
1273 * Allocates and initializes a new crtc object. Cleanup is automatically
1274 * handled through registering drmm_crtc_cleanup() with drmm_add_action().
1275 *
1276 * The @drm_crtc_funcs.destroy hook must be NULL.
1277 *
1278 * Returns:
1279 * Pointer to new crtc, or ERR_PTR on failure.
1280 */
1281#define drmm_crtc_alloc_with_planes(dev, type, member, primary, cursor, funcs, name, ...) \
1282 ((type *)__drmm_crtc_alloc_with_planes(dev, sizeof(type), \
1283 offsetof(type, member), \
1284 primary, cursor, funcs, \
1285 name, ##__VA_ARGS__))
1286
1287/**
1288 * drm_crtc_index - find the index of a registered CRTC
1289 * @crtc: CRTC to find index for
1290 *
1291 * Given a registered CRTC, return the index of that CRTC within a DRM
1292 * device's list of CRTCs.
1293 */
1294static inline unsigned int drm_crtc_index(const struct drm_crtc *crtc)
1295{
1296 return crtc->index;
1297}
1298
1299/**
1300 * drm_crtc_mask - find the mask of a registered CRTC
1301 * @crtc: CRTC to find mask for
1302 *
1303 * Given a registered CRTC, return the mask bit of that CRTC for the
1304 * &drm_encoder.possible_crtcs and &drm_plane.possible_crtcs fields.
1305 */
1306static inline uint32_t drm_crtc_mask(const struct drm_crtc *crtc)
1307{
1308 return 1 << drm_crtc_index(crtc);
1309}
1310
1311int drm_mode_set_config_internal(struct drm_mode_set *set);
1312struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx);
1313
1314/**
1315 * drm_crtc_find - look up a CRTC object from its ID
1316 * @dev: DRM device
1317 * @file_priv: drm file to check for lease against.
1318 * @id: &drm_mode_object ID
1319 *
1320 * This can be used to look up a CRTC from its userspace ID. Only used by
1321 * drivers for legacy IOCTLs and interface, nowadays extensions to the KMS
1322 * userspace interface should be done using &drm_property.
1323 */
1324static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
1325 struct drm_file *file_priv,
1326 uint32_t id)
1327{
1328 struct drm_mode_object *mo;
1329 mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CRTC);
1330 return mo ? obj_to_crtc(mo) : NULL;
1331}
1332
1333/**
1334 * drm_for_each_crtc - iterate over all CRTCs
1335 * @crtc: a &struct drm_crtc as the loop cursor
1336 * @dev: the &struct drm_device
1337 *
1338 * Iterate over all CRTCs of @dev.
1339 */
1340#define drm_for_each_crtc(crtc, dev) \
1341 list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
1342
1343/**
1344 * drm_for_each_crtc_reverse - iterate over all CRTCs in reverse order
1345 * @crtc: a &struct drm_crtc as the loop cursor
1346 * @dev: the &struct drm_device
1347 *
1348 * Iterate over all CRTCs of @dev.
1349 */
1350#define drm_for_each_crtc_reverse(crtc, dev) \
1351 list_for_each_entry_reverse(crtc, &(dev)->mode_config.crtc_list, head)
1352
1353int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
1354 unsigned int supported_filters);
1355bool drm_crtc_in_clone_mode(struct drm_crtc_state *crtc_state);
1356int drm_crtc_create_sharpness_strength_property(struct drm_crtc *crtc);
1357#endif /* __DRM_CRTC_H__ */