1 /*
2  * Copyright © 2006 Keith Packard
3  * Copyright © 2007-2008 Dave Airlie
4  * Copyright © 2007-2008 Intel Corporation
5  *   Jesse Barnes <jesse.barnes@intel.com>
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a
8  * copy of this software and associated documentation files (the "Software"),
9  * to deal in the Software without restriction, including without limitation
10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11  * and/or sell copies of the Software, and to permit persons to whom the
12  * Software is furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23  * OTHER DEALINGS IN THE SOFTWARE.
24  */
25 #ifndef __DRM_CRTC_H__
26 #define __DRM_CRTC_H__
27 
28 #include <linux/i2c.h>
29 #include <linux/spinlock.h>
30 #include <linux/types.h>
31 #include <linux/fb.h>
32 #include <linux/hdmi.h>
33 #include <linux/media-bus-format.h>
34 #include <uapi/drm/drm_mode.h>
35 #include <uapi/drm/drm_fourcc.h>
36 #include <drm/drm_modeset_lock.h>
37 #include <drm/drm_rect.h>
38 #include <drm/drm_mode_object.h>
39 #include <drm/drm_framebuffer.h>
40 #include <drm/drm_modes.h>
41 #include <drm/drm_connector.h>
42 #include <drm/drm_device.h>
43 #include <drm/drm_property.h>
44 #include <drm/drm_edid.h>
45 #include <drm/drm_plane.h>
46 #include <drm/drm_blend.h>
47 #include <drm/drm_color_mgmt.h>
48 #include <drm/drm_debugfs_crc.h>
49 #include <drm/drm_mode_config.h>
50 
51 struct drm_device;
52 struct drm_mode_set;
53 struct drm_file;
54 struct drm_clip_rect;
55 struct drm_printer;
56 struct drm_self_refresh_data;
57 struct device_node;
58 struct dma_fence;
59 struct edid;
60 
U642I64(uint64_t val)61 static inline int64_t U642I64(uint64_t val)
62 {
63 	return (int64_t)*((int64_t *)&val);
64 }
I642U64(int64_t val)65 static inline uint64_t I642U64(int64_t val)
66 {
67 	return (uint64_t)*((uint64_t *)&val);
68 }
69 
70 struct drm_crtc;
71 struct drm_pending_vblank_event;
72 struct drm_plane;
73 struct drm_bridge;
74 struct drm_atomic_state;
75 
76 struct drm_crtc_helper_funcs;
77 struct drm_plane_helper_funcs;
78 
79 /**
80  * struct drm_crtc_state - mutable CRTC state
81  *
82  * Note that the distinction between @enable and @active is rather subtle:
83  * Flipping @active while @enable is set without changing anything else may
84  * never return in a failure from the &drm_mode_config_funcs.atomic_check
85  * callback. Userspace assumes that a DPMS On will always succeed. In other
86  * words: @enable controls resource assignment, @active controls the actual
87  * hardware state.
88  *
89  * The three booleans active_changed, connectors_changed and mode_changed are
90  * intended to indicate whether a full modeset is needed, rather than strictly
91  * describing what has changed in a commit. See also:
92  * drm_atomic_crtc_needs_modeset()
93  *
94  * WARNING: Transitional helpers (like drm_helper_crtc_mode_set() or
95  * drm_helper_crtc_mode_set_base()) do not maintain many of the derived control
96  * state like @plane_mask so drivers not converted over to atomic helpers should
97  * not rely on these being accurate!
98  */
99 struct drm_crtc_state {
100 	/** @crtc: backpointer to the CRTC */
101 	struct drm_crtc *crtc;
102 
103 	/**
104 	 * @enable: Whether the CRTC should be enabled, gates all other state.
105 	 * This controls reservations of shared resources. Actual hardware state
106 	 * is controlled by @active.
107 	 */
108 	bool enable;
109 
110 	/**
111 	 * @active: Whether the CRTC is actively displaying (used for DPMS).
112 	 * Implies that @enable is set. The driver must not release any shared
113 	 * resources if @active is set to false but @enable still true, because
114 	 * userspace expects that a DPMS ON always succeeds.
115 	 *
116 	 * Hence drivers must not consult @active in their various
117 	 * &drm_mode_config_funcs.atomic_check callback to reject an atomic
118 	 * commit. They can consult it to aid in the computation of derived
119 	 * hardware state, since even in the DPMS OFF state the display hardware
120 	 * should be as much powered down as when the CRTC is completely
121 	 * disabled through setting @enable to false.
122 	 */
123 	bool active;
124 
125 	/**
126 	 * @planes_changed: Planes on this crtc are updated. Used by the atomic
127 	 * helpers and drivers to steer the atomic commit control flow.
128 	 */
129 	bool planes_changed : 1;
130 
131 	/**
132 	 * @mode_changed: @mode or @enable has been changed. Used by the atomic
133 	 * helpers and drivers to steer the atomic commit control flow. See also
134 	 * drm_atomic_crtc_needs_modeset().
135 	 *
136 	 * Drivers are supposed to set this for any CRTC state changes that
137 	 * require a full modeset. They can also reset it to false if e.g. a
138 	 * @mode change can be done without a full modeset by only changing
139 	 * scaler settings.
140 	 */
141 	bool mode_changed : 1;
142 
143 	/**
144 	 * @active_changed: @active has been toggled. Used by the atomic
145 	 * helpers and drivers to steer the atomic commit control flow. See also
146 	 * drm_atomic_crtc_needs_modeset().
147 	 */
148 	bool active_changed : 1;
149 
150 	/**
151 	 * @connectors_changed: Connectors to this crtc have been updated,
152 	 * either in their state or routing. Used by the atomic
153 	 * helpers and drivers to steer the atomic commit control flow. See also
154 	 * drm_atomic_crtc_needs_modeset().
155 	 *
156 	 * Drivers are supposed to set this as-needed from their own atomic
157 	 * check code, e.g. from &drm_encoder_helper_funcs.atomic_check
158 	 */
159 	bool connectors_changed : 1;
160 	/**
161 	 * @zpos_changed: zpos values of planes on this crtc have been updated.
162 	 * Used by the atomic helpers and drivers to steer the atomic commit
163 	 * control flow.
164 	 */
165 	bool zpos_changed : 1;
166 	/**
167 	 * @color_mgmt_changed: Color management properties have changed
168 	 * (@gamma_lut, @degamma_lut or @ctm). Used by the atomic helpers and
169 	 * drivers to steer the atomic commit control flow.
170 	 */
171 	bool color_mgmt_changed : 1;
172 
173 	/**
174 	 * @no_vblank:
175 	 *
176 	 * Reflects the ability of a CRTC to send VBLANK events. This state
177 	 * usually depends on the pipeline configuration. If set to true, DRM
178 	 * atomic helpers will send out a fake VBLANK event during display
179 	 * updates after all hardware changes have been committed. This is
180 	 * implemented in drm_atomic_helper_fake_vblank().
181 	 *
182 	 * One usage is for drivers and/or hardware without support for VBLANK
183 	 * interrupts. Such drivers typically do not initialize vblanking
184 	 * (i.e., call drm_vblank_init() with the number of CRTCs). For CRTCs
185 	 * without initialized vblanking, this field is set to true in
186 	 * drm_atomic_helper_check_modeset(), and a fake VBLANK event will be
187 	 * send out on each update of the display pipeline by
188 	 * drm_atomic_helper_fake_vblank().
189 	 *
190 	 * Another usage is CRTCs feeding a writeback connector operating in
191 	 * oneshot mode. In this case the fake VBLANK event is only generated
192 	 * when a job is queued to the writeback connector, and we want the
193 	 * core to fake VBLANK events when this part of the pipeline hasn't
194 	 * changed but others had or when the CRTC and connectors are being
195 	 * disabled.
196 	 *
197 	 * __drm_atomic_helper_crtc_duplicate_state() will not reset the value
198 	 * from the current state, the CRTC driver is then responsible for
199 	 * updating this field when needed.
200 	 *
201 	 * Note that the combination of &drm_crtc_state.event == NULL and
202 	 * &drm_crtc_state.no_blank == true is valid and usually used when the
203 	 * writeback connector attached to the CRTC has a new job queued. In
204 	 * this case the driver will send the VBLANK event on its own when the
205 	 * writeback job is complete.
206 	 */
207 	bool no_vblank : 1;
208 
209 	/**
210 	 * @plane_mask: Bitmask of drm_plane_mask(plane) of planes attached to
211 	 * this CRTC.
212 	 */
213 	u32 plane_mask;
214 
215 	/**
216 	 * @connector_mask: Bitmask of drm_connector_mask(connector) of
217 	 * connectors attached to this CRTC.
218 	 */
219 	u32 connector_mask;
220 
221 	/**
222 	 * @encoder_mask: Bitmask of drm_encoder_mask(encoder) of encoders
223 	 * attached to this CRTC.
224 	 */
225 	u32 encoder_mask;
226 
227 	/**
228 	 * @adjusted_mode:
229 	 *
230 	 * Internal display timings which can be used by the driver to handle
231 	 * differences between the mode requested by userspace in @mode and what
232 	 * is actually programmed into the hardware.
233 	 *
234 	 * For drivers using &drm_bridge, this stores hardware display timings
235 	 * used between the CRTC and the first bridge. For other drivers, the
236 	 * meaning of the adjusted_mode field is purely driver implementation
237 	 * defined information, and will usually be used to store the hardware
238 	 * display timings used between the CRTC and encoder blocks.
239 	 */
240 	struct drm_display_mode adjusted_mode;
241 
242 	/**
243 	 * @mode:
244 	 *
245 	 * Display timings requested by userspace. The driver should try to
246 	 * match the refresh rate as close as possible (but note that it's
247 	 * undefined what exactly is close enough, e.g. some of the HDMI modes
248 	 * only differ in less than 1% of the refresh rate). The active width
249 	 * and height as observed by userspace for positioning planes must match
250 	 * exactly.
251 	 *
252 	 * For external connectors where the sink isn't fixed (like with a
253 	 * built-in panel), this mode here should match the physical mode on the
254 	 * wire to the last details (i.e. including sync polarities and
255 	 * everything).
256 	 */
257 	struct drm_display_mode mode;
258 
259 	/**
260 	 * @mode_blob: &drm_property_blob for @mode, for exposing the mode to
261 	 * atomic userspace.
262 	 */
263 	struct drm_property_blob *mode_blob;
264 
265 	/**
266 	 * @degamma_lut:
267 	 *
268 	 * Lookup table for converting framebuffer pixel data before apply the
269 	 * color conversion matrix @ctm. See drm_crtc_enable_color_mgmt(). The
270 	 * blob (if not NULL) is an array of &struct drm_color_lut.
271 	 */
272 	struct drm_property_blob *degamma_lut;
273 
274 	/**
275 	 * @ctm:
276 	 *
277 	 * Color transformation matrix. See drm_crtc_enable_color_mgmt(). The
278 	 * blob (if not NULL) is a &struct drm_color_ctm.
279 	 */
280 	struct drm_property_blob *ctm;
281 
282 	/**
283 	 * @gamma_lut:
284 	 *
285 	 * Lookup table for converting pixel data after the color conversion
286 	 * matrix @ctm.  See drm_crtc_enable_color_mgmt(). The blob (if not
287 	 * NULL) is an array of &struct drm_color_lut.
288 	 *
289 	 * Note that for mostly historical reasons stemming from Xorg heritage,
290 	 * this is also used to store the color map (also sometimes color lut,
291 	 * CLUT or color palette) for indexed formats like DRM_FORMAT_C8.
292 	 */
293 	struct drm_property_blob *gamma_lut;
294 
295 	/**
296 	 * @target_vblank:
297 	 *
298 	 * Target vertical blank period when a page flip
299 	 * should take effect.
300 	 */
301 	u32 target_vblank;
302 
303 	/**
304 	 * @async_flip:
305 	 *
306 	 * This is set when DRM_MODE_PAGE_FLIP_ASYNC is set in the legacy
307 	 * PAGE_FLIP IOCTL. It's not wired up for the atomic IOCTL itself yet.
308 	 */
309 	bool async_flip;
310 
311 	/**
312 	 * @vrr_enabled:
313 	 *
314 	 * Indicates if variable refresh rate should be enabled for the CRTC.
315 	 * Support for the requested vrr state will depend on driver and
316 	 * hardware capabiltiy - lacking support is not treated as failure.
317 	 */
318 	bool vrr_enabled;
319 
320 	/**
321 	 * @self_refresh_active:
322 	 *
323 	 * Used by the self refresh helpers to denote when a self refresh
324 	 * transition is occurring. This will be set on enable/disable callbacks
325 	 * when self refresh is being enabled or disabled. In some cases, it may
326 	 * not be desirable to fully shut off the crtc during self refresh.
327 	 * CRTC's can inspect this flag and determine the best course of action.
328 	 */
329 	bool self_refresh_active;
330 
331 	/**
332 	 * @scaling_filter:
333 	 *
334 	 * Scaling filter to be applied
335 	 */
336 	enum drm_scaling_filter scaling_filter;
337 
338 	/**
339 	 * @event:
340 	 *
341 	 * Optional pointer to a DRM event to signal upon completion of the
342 	 * state update. The driver must send out the event when the atomic
343 	 * commit operation completes. There are two cases:
344 	 *
345 	 *  - The event is for a CRTC which is being disabled through this
346 	 *    atomic commit. In that case the event can be send out any time
347 	 *    after the hardware has stopped scanning out the current
348 	 *    framebuffers. It should contain the timestamp and counter for the
349 	 *    last vblank before the display pipeline was shut off. The simplest
350 	 *    way to achieve that is calling drm_crtc_send_vblank_event()
351 	 *    somewhen after drm_crtc_vblank_off() has been called.
352 	 *
353 	 *  - For a CRTC which is enabled at the end of the commit (even when it
354 	 *    undergoes an full modeset) the vblank timestamp and counter must
355 	 *    be for the vblank right before the first frame that scans out the
356 	 *    new set of buffers. Again the event can only be sent out after the
357 	 *    hardware has stopped scanning out the old buffers.
358 	 *
359 	 *  - Events for disabled CRTCs are not allowed, and drivers can ignore
360 	 *    that case.
361 	 *
362 	 * For very simple hardware without VBLANK interrupt, enabling
363 	 * &struct drm_crtc_state.no_vblank makes DRM's atomic commit helpers
364 	 * send a fake VBLANK event at the end of the display update after all
365 	 * hardware changes have been applied. See
366 	 * drm_atomic_helper_fake_vblank().
367 	 *
368 	 * For more complex hardware this
369 	 * can be handled by the drm_crtc_send_vblank_event() function,
370 	 * which the driver should call on the provided event upon completion of
371 	 * the atomic commit. Note that if the driver supports vblank signalling
372 	 * and timestamping the vblank counters and timestamps must agree with
373 	 * the ones returned from page flip events. With the current vblank
374 	 * helper infrastructure this can be achieved by holding a vblank
375 	 * reference while the page flip is pending, acquired through
376 	 * drm_crtc_vblank_get() and released with drm_crtc_vblank_put().
377 	 * Drivers are free to implement their own vblank counter and timestamp
378 	 * tracking though, e.g. if they have accurate timestamp registers in
379 	 * hardware.
380 	 *
381 	 * For hardware which supports some means to synchronize vblank
382 	 * interrupt delivery with committing display state there's also
383 	 * drm_crtc_arm_vblank_event(). See the documentation of that function
384 	 * for a detailed discussion of the constraints it needs to be used
385 	 * safely.
386 	 *
387 	 * If the device can't notify of flip completion in a race-free way
388 	 * at all, then the event should be armed just after the page flip is
389 	 * committed. In the worst case the driver will send the event to
390 	 * userspace one frame too late. This doesn't allow for a real atomic
391 	 * update, but it should avoid tearing.
392 	 */
393 	struct drm_pending_vblank_event *event;
394 
395 	/**
396 	 * @commit:
397 	 *
398 	 * This tracks how the commit for this update proceeds through the
399 	 * various phases. This is never cleared, except when we destroy the
400 	 * state, so that subsequent commits can synchronize with previous ones.
401 	 */
402 	struct drm_crtc_commit *commit;
403 
404 	/** @state: backpointer to global drm_atomic_state */
405 	struct drm_atomic_state *state;
406 };
407 
408 /**
409  * struct drm_crtc_funcs - control CRTCs for a given device
410  *
411  * The drm_crtc_funcs structure is the central CRTC management structure
412  * in the DRM.  Each CRTC controls one or more connectors (note that the name
413  * CRTC is simply historical, a CRTC may control LVDS, VGA, DVI, TV out, etc.
414  * connectors, not just CRTs).
415  *
416  * Each driver is responsible for filling out this structure at startup time,
417  * in addition to providing other modesetting features, like i2c and DDC
418  * bus accessors.
419  */
420 struct drm_crtc_funcs {
421 	/**
422 	 * @reset:
423 	 *
424 	 * Reset CRTC hardware and software state to off. This function isn't
425 	 * called by the core directly, only through drm_mode_config_reset().
426 	 * It's not a helper hook only for historical reasons.
427 	 *
428 	 * Atomic drivers can use drm_atomic_helper_crtc_reset() to reset
429 	 * atomic state using this hook.
430 	 */
431 	void (*reset)(struct drm_crtc *crtc);
432 
433 	/**
434 	 * @cursor_set:
435 	 *
436 	 * Update the cursor image. The cursor position is relative to the CRTC
437 	 * and can be partially or fully outside of the visible area.
438 	 *
439 	 * Note that contrary to all other KMS functions the legacy cursor entry
440 	 * points don't take a framebuffer object, but instead take directly a
441 	 * raw buffer object id from the driver's buffer manager (which is
442 	 * either GEM or TTM for current drivers).
443 	 *
444 	 * This entry point is deprecated, drivers should instead implement
445 	 * universal plane support and register a proper cursor plane using
446 	 * drm_crtc_init_with_planes().
447 	 *
448 	 * This callback is optional
449 	 *
450 	 * RETURNS:
451 	 *
452 	 * 0 on success or a negative error code on failure.
453 	 */
454 	int (*cursor_set)(struct drm_crtc *crtc, struct drm_file *file_priv,
455 			  uint32_t handle, uint32_t width, uint32_t height);
456 
457 	/**
458 	 * @cursor_set2:
459 	 *
460 	 * Update the cursor image, including hotspot information. The hotspot
461 	 * must not affect the cursor position in CRTC coordinates, but is only
462 	 * meant as a hint for virtualized display hardware to coordinate the
463 	 * guests and hosts cursor position. The cursor hotspot is relative to
464 	 * the cursor image. Otherwise this works exactly like @cursor_set.
465 	 *
466 	 * This entry point is deprecated, drivers should instead implement
467 	 * universal plane support and register a proper cursor plane using
468 	 * drm_crtc_init_with_planes().
469 	 *
470 	 * This callback is optional.
471 	 *
472 	 * RETURNS:
473 	 *
474 	 * 0 on success or a negative error code on failure.
475 	 */
476 	int (*cursor_set2)(struct drm_crtc *crtc, struct drm_file *file_priv,
477 			   uint32_t handle, uint32_t width, uint32_t height,
478 			   int32_t hot_x, int32_t hot_y);
479 
480 	/**
481 	 * @cursor_move:
482 	 *
483 	 * Update the cursor position. The cursor does not need to be visible
484 	 * when this hook is called.
485 	 *
486 	 * This entry point is deprecated, drivers should instead implement
487 	 * universal plane support and register a proper cursor plane using
488 	 * drm_crtc_init_with_planes().
489 	 *
490 	 * This callback is optional.
491 	 *
492 	 * RETURNS:
493 	 *
494 	 * 0 on success or a negative error code on failure.
495 	 */
496 	int (*cursor_move)(struct drm_crtc *crtc, int x, int y);
497 
498 	/**
499 	 * @gamma_set:
500 	 *
501 	 * Set gamma on the CRTC.
502 	 *
503 	 * This callback is optional.
504 	 *
505 	 * Atomic drivers who want to support gamma tables should implement the
506 	 * atomic color management support, enabled by calling
507 	 * drm_crtc_enable_color_mgmt(), which then supports the legacy gamma
508 	 * interface through the drm_atomic_helper_legacy_gamma_set()
509 	 * compatibility implementation.
510 	 */
511 	int (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
512 			 uint32_t size,
513 			 struct drm_modeset_acquire_ctx *ctx);
514 
515 	/**
516 	 * @destroy:
517 	 *
518 	 * Clean up CRTC resources. This is only called at driver unload time
519 	 * through drm_mode_config_cleanup() since a CRTC cannot be hotplugged
520 	 * in DRM.
521 	 */
522 	void (*destroy)(struct drm_crtc *crtc);
523 
524 	/**
525 	 * @set_config:
526 	 *
527 	 * This is the main legacy entry point to change the modeset state on a
528 	 * CRTC. All the details of the desired configuration are passed in a
529 	 * &struct drm_mode_set - see there for details.
530 	 *
531 	 * Drivers implementing atomic modeset should use
532 	 * drm_atomic_helper_set_config() to implement this hook.
533 	 *
534 	 * RETURNS:
535 	 *
536 	 * 0 on success or a negative error code on failure.
537 	 */
538 	int (*set_config)(struct drm_mode_set *set,
539 			  struct drm_modeset_acquire_ctx *ctx);
540 
541 	/**
542 	 * @page_flip:
543 	 *
544 	 * Legacy entry point to schedule a flip to the given framebuffer.
545 	 *
546 	 * Page flipping is a synchronization mechanism that replaces the frame
547 	 * buffer being scanned out by the CRTC with a new frame buffer during
548 	 * vertical blanking, avoiding tearing (except when requested otherwise
549 	 * through the DRM_MODE_PAGE_FLIP_ASYNC flag). When an application
550 	 * requests a page flip the DRM core verifies that the new frame buffer
551 	 * is large enough to be scanned out by the CRTC in the currently
552 	 * configured mode and then calls this hook with a pointer to the new
553 	 * frame buffer.
554 	 *
555 	 * The driver must wait for any pending rendering to the new framebuffer
556 	 * to complete before executing the flip. It should also wait for any
557 	 * pending rendering from other drivers if the underlying buffer is a
558 	 * shared dma-buf.
559 	 *
560 	 * An application can request to be notified when the page flip has
561 	 * completed. The drm core will supply a &struct drm_event in the event
562 	 * parameter in this case. This can be handled by the
563 	 * drm_crtc_send_vblank_event() function, which the driver should call on
564 	 * the provided event upon completion of the flip. Note that if
565 	 * the driver supports vblank signalling and timestamping the vblank
566 	 * counters and timestamps must agree with the ones returned from page
567 	 * flip events. With the current vblank helper infrastructure this can
568 	 * be achieved by holding a vblank reference while the page flip is
569 	 * pending, acquired through drm_crtc_vblank_get() and released with
570 	 * drm_crtc_vblank_put(). Drivers are free to implement their own vblank
571 	 * counter and timestamp tracking though, e.g. if they have accurate
572 	 * timestamp registers in hardware.
573 	 *
574 	 * This callback is optional.
575 	 *
576 	 * NOTE:
577 	 *
578 	 * Very early versions of the KMS ABI mandated that the driver must
579 	 * block (but not reject) any rendering to the old framebuffer until the
580 	 * flip operation has completed and the old framebuffer is no longer
581 	 * visible. This requirement has been lifted, and userspace is instead
582 	 * expected to request delivery of an event and wait with recycling old
583 	 * buffers until such has been received.
584 	 *
585 	 * RETURNS:
586 	 *
587 	 * 0 on success or a negative error code on failure. Note that if a
588 	 * page flip operation is already pending the callback should return
589 	 * -EBUSY. Pageflips on a disabled CRTC (either by setting a NULL mode
590 	 * or just runtime disabled through DPMS respectively the new atomic
591 	 * "ACTIVE" state) should result in an -EINVAL error code. Note that
592 	 * drm_atomic_helper_page_flip() checks this already for atomic drivers.
593 	 */
594 	int (*page_flip)(struct drm_crtc *crtc,
595 			 struct drm_framebuffer *fb,
596 			 struct drm_pending_vblank_event *event,
597 			 uint32_t flags,
598 			 struct drm_modeset_acquire_ctx *ctx);
599 
600 	/**
601 	 * @page_flip_target:
602 	 *
603 	 * Same as @page_flip but with an additional parameter specifying the
604 	 * absolute target vertical blank period (as reported by
605 	 * drm_crtc_vblank_count()) when the flip should take effect.
606 	 *
607 	 * Note that the core code calls drm_crtc_vblank_get before this entry
608 	 * point, and will call drm_crtc_vblank_put if this entry point returns
609 	 * any non-0 error code. It's the driver's responsibility to call
610 	 * drm_crtc_vblank_put after this entry point returns 0, typically when
611 	 * the flip completes.
612 	 */
613 	int (*page_flip_target)(struct drm_crtc *crtc,
614 				struct drm_framebuffer *fb,
615 				struct drm_pending_vblank_event *event,
616 				uint32_t flags, uint32_t target,
617 				struct drm_modeset_acquire_ctx *ctx);
618 
619 	/**
620 	 * @set_property:
621 	 *
622 	 * This is the legacy entry point to update a property attached to the
623 	 * CRTC.
624 	 *
625 	 * This callback is optional if the driver does not support any legacy
626 	 * driver-private properties. For atomic drivers it is not used because
627 	 * property handling is done entirely in the DRM core.
628 	 *
629 	 * RETURNS:
630 	 *
631 	 * 0 on success or a negative error code on failure.
632 	 */
633 	int (*set_property)(struct drm_crtc *crtc,
634 			    struct drm_property *property, uint64_t val);
635 
636 	/**
637 	 * @atomic_duplicate_state:
638 	 *
639 	 * Duplicate the current atomic state for this CRTC and return it.
640 	 * The core and helpers guarantee that any atomic state duplicated with
641 	 * this hook and still owned by the caller (i.e. not transferred to the
642 	 * driver by calling &drm_mode_config_funcs.atomic_commit) will be
643 	 * cleaned up by calling the @atomic_destroy_state hook in this
644 	 * structure.
645 	 *
646 	 * This callback is mandatory for atomic drivers.
647 	 *
648 	 * Atomic drivers which don't subclass &struct drm_crtc_state should use
649 	 * drm_atomic_helper_crtc_duplicate_state(). Drivers that subclass the
650 	 * state structure to extend it with driver-private state should use
651 	 * __drm_atomic_helper_crtc_duplicate_state() to make sure shared state is
652 	 * duplicated in a consistent fashion across drivers.
653 	 *
654 	 * It is an error to call this hook before &drm_crtc.state has been
655 	 * initialized correctly.
656 	 *
657 	 * NOTE:
658 	 *
659 	 * If the duplicate state references refcounted resources this hook must
660 	 * acquire a reference for each of them. The driver must release these
661 	 * references again in @atomic_destroy_state.
662 	 *
663 	 * RETURNS:
664 	 *
665 	 * Duplicated atomic state or NULL when the allocation failed.
666 	 */
667 	struct drm_crtc_state *(*atomic_duplicate_state)(struct drm_crtc *crtc);
668 
669 	/**
670 	 * @atomic_destroy_state:
671 	 *
672 	 * Destroy a state duplicated with @atomic_duplicate_state and release
673 	 * or unreference all resources it references
674 	 *
675 	 * This callback is mandatory for atomic drivers.
676 	 */
677 	void (*atomic_destroy_state)(struct drm_crtc *crtc,
678 				     struct drm_crtc_state *state);
679 
680 	/**
681 	 * @atomic_set_property:
682 	 *
683 	 * Decode a driver-private property value and store the decoded value
684 	 * into the passed-in state structure. Since the atomic core decodes all
685 	 * standardized properties (even for extensions beyond the core set of
686 	 * properties which might not be implemented by all drivers) this
687 	 * requires drivers to subclass the state structure.
688 	 *
689 	 * Such driver-private properties should really only be implemented for
690 	 * truly hardware/vendor specific state. Instead it is preferred to
691 	 * standardize atomic extension and decode the properties used to expose
692 	 * such an extension in the core.
693 	 *
694 	 * Do not call this function directly, use
695 	 * drm_atomic_crtc_set_property() instead.
696 	 *
697 	 * This callback is optional if the driver does not support any
698 	 * driver-private atomic properties.
699 	 *
700 	 * NOTE:
701 	 *
702 	 * This function is called in the state assembly phase of atomic
703 	 * modesets, which can be aborted for any reason (including on
704 	 * userspace's request to just check whether a configuration would be
705 	 * possible). Drivers MUST NOT touch any persistent state (hardware or
706 	 * software) or data structures except the passed in @state parameter.
707 	 *
708 	 * Also since userspace controls in which order properties are set this
709 	 * function must not do any input validation (since the state update is
710 	 * incomplete and hence likely inconsistent). Instead any such input
711 	 * validation must be done in the various atomic_check callbacks.
712 	 *
713 	 * RETURNS:
714 	 *
715 	 * 0 if the property has been found, -EINVAL if the property isn't
716 	 * implemented by the driver (which should never happen, the core only
717 	 * asks for properties attached to this CRTC). No other validation is
718 	 * allowed by the driver. The core already checks that the property
719 	 * value is within the range (integer, valid enum value, ...) the driver
720 	 * set when registering the property.
721 	 */
722 	int (*atomic_set_property)(struct drm_crtc *crtc,
723 				   struct drm_crtc_state *state,
724 				   struct drm_property *property,
725 				   uint64_t val);
726 	/**
727 	 * @atomic_get_property:
728 	 *
729 	 * Reads out the decoded driver-private property. This is used to
730 	 * implement the GETCRTC IOCTL.
731 	 *
732 	 * Do not call this function directly, use
733 	 * drm_atomic_crtc_get_property() instead.
734 	 *
735 	 * This callback is optional if the driver does not support any
736 	 * driver-private atomic properties.
737 	 *
738 	 * RETURNS:
739 	 *
740 	 * 0 on success, -EINVAL if the property isn't implemented by the
741 	 * driver (which should never happen, the core only asks for
742 	 * properties attached to this CRTC).
743 	 */
744 	int (*atomic_get_property)(struct drm_crtc *crtc,
745 				   const struct drm_crtc_state *state,
746 				   struct drm_property *property,
747 				   uint64_t *val);
748 
749 	/**
750 	 * @late_register:
751 	 *
752 	 * This optional hook can be used to register additional userspace
753 	 * interfaces attached to the crtc like debugfs interfaces.
754 	 * It is called late in the driver load sequence from drm_dev_register().
755 	 * Everything added from this callback should be unregistered in
756 	 * the early_unregister callback.
757 	 *
758 	 * Returns:
759 	 *
760 	 * 0 on success, or a negative error code on failure.
761 	 */
762 	int (*late_register)(struct drm_crtc *crtc);
763 
764 	/**
765 	 * @early_unregister:
766 	 *
767 	 * This optional hook should be used to unregister the additional
768 	 * userspace interfaces attached to the crtc from
769 	 * @late_register. It is called from drm_dev_unregister(),
770 	 * early in the driver unload sequence to disable userspace access
771 	 * before data structures are torndown.
772 	 */
773 	void (*early_unregister)(struct drm_crtc *crtc);
774 
775 	/**
776 	 * @set_crc_source:
777 	 *
778 	 * Changes the source of CRC checksums of frames at the request of
779 	 * userspace, typically for testing purposes. The sources available are
780 	 * specific of each driver and a %NULL value indicates that CRC
781 	 * generation is to be switched off.
782 	 *
783 	 * When CRC generation is enabled, the driver should call
784 	 * drm_crtc_add_crc_entry() at each frame, providing any information
785 	 * that characterizes the frame contents in the crcN arguments, as
786 	 * provided from the configured source. Drivers must accept an "auto"
787 	 * source name that will select a default source for this CRTC.
788 	 *
789 	 * This may trigger an atomic modeset commit if necessary, to enable CRC
790 	 * generation.
791 	 *
792 	 * Note that "auto" can depend upon the current modeset configuration,
793 	 * e.g. it could pick an encoder or output specific CRC sampling point.
794 	 *
795 	 * This callback is optional if the driver does not support any CRC
796 	 * generation functionality.
797 	 *
798 	 * RETURNS:
799 	 *
800 	 * 0 on success or a negative error code on failure.
801 	 */
802 	int (*set_crc_source)(struct drm_crtc *crtc, const char *source);
803 
804 	/**
805 	 * @verify_crc_source:
806 	 *
807 	 * verifies the source of CRC checksums of frames before setting the
808 	 * source for CRC and during crc open. Source parameter can be NULL
809 	 * while disabling crc source.
810 	 *
811 	 * This callback is optional if the driver does not support any CRC
812 	 * generation functionality.
813 	 *
814 	 * RETURNS:
815 	 *
816 	 * 0 on success or a negative error code on failure.
817 	 */
818 	int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
819 				 size_t *values_cnt);
820 	/**
821 	 * @get_crc_sources:
822 	 *
823 	 * Driver callback for getting a list of all the available sources for
824 	 * CRC generation. This callback depends upon verify_crc_source, So
825 	 * verify_crc_source callback should be implemented before implementing
826 	 * this. Driver can pass full list of available crc sources, this
827 	 * callback does the verification on each crc-source before passing it
828 	 * to userspace.
829 	 *
830 	 * This callback is optional if the driver does not support exporting of
831 	 * possible CRC sources list.
832 	 *
833 	 * RETURNS:
834 	 *
835 	 * a constant character pointer to the list of all the available CRC
836 	 * sources. On failure driver should return NULL. count should be
837 	 * updated with number of sources in list. if zero we don't process any
838 	 * source from the list.
839 	 */
840 	const char *const *(*get_crc_sources)(struct drm_crtc *crtc,
841 					      size_t *count);
842 
843 	/**
844 	 * @atomic_print_state:
845 	 *
846 	 * If driver subclasses &struct drm_crtc_state, it should implement
847 	 * this optional hook for printing additional driver specific state.
848 	 *
849 	 * Do not call this directly, use drm_atomic_crtc_print_state()
850 	 * instead.
851 	 */
852 	void (*atomic_print_state)(struct drm_printer *p,
853 				   const struct drm_crtc_state *state);
854 
855 	/**
856 	 * @get_vblank_counter:
857 	 *
858 	 * Driver callback for fetching a raw hardware vblank counter for the
859 	 * CRTC. It's meant to be used by new drivers as the replacement of
860 	 * &drm_driver.get_vblank_counter hook.
861 	 *
862 	 * This callback is optional. If a device doesn't have a hardware
863 	 * counter, the driver can simply leave the hook as NULL. The DRM core
864 	 * will account for missed vblank events while interrupts where disabled
865 	 * based on system timestamps.
866 	 *
867 	 * Wraparound handling and loss of events due to modesetting is dealt
868 	 * with in the DRM core code, as long as drivers call
869 	 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
870 	 * enabling a CRTC.
871 	 *
872 	 * See also &drm_device.vblank_disable_immediate and
873 	 * &drm_device.max_vblank_count.
874 	 *
875 	 * Returns:
876 	 *
877 	 * Raw vblank counter value.
878 	 */
879 	u32 (*get_vblank_counter)(struct drm_crtc *crtc);
880 
881 	/**
882 	 * @enable_vblank:
883 	 *
884 	 * Enable vblank interrupts for the CRTC. It's meant to be used by
885 	 * new drivers as the replacement of &drm_driver.enable_vblank hook.
886 	 *
887 	 * Returns:
888 	 *
889 	 * Zero on success, appropriate errno if the vblank interrupt cannot
890 	 * be enabled.
891 	 */
892 	int (*enable_vblank)(struct drm_crtc *crtc);
893 
894 	/**
895 	 * @disable_vblank:
896 	 *
897 	 * Disable vblank interrupts for the CRTC. It's meant to be used by
898 	 * new drivers as the replacement of &drm_driver.disable_vblank hook.
899 	 */
900 	void (*disable_vblank)(struct drm_crtc *crtc);
901 
902 	/**
903 	 * @get_vblank_timestamp:
904 	 *
905 	 * Called by drm_get_last_vbltimestamp(). Should return a precise
906 	 * timestamp when the most recent vblank interval ended or will end.
907 	 *
908 	 * Specifically, the timestamp in @vblank_time should correspond as
909 	 * closely as possible to the time when the first video scanline of
910 	 * the video frame after the end of vblank will start scanning out,
911 	 * the time immediately after end of the vblank interval. If the
912 	 * @crtc is currently inside vblank, this will be a time in the future.
913 	 * If the @crtc is currently scanning out a frame, this will be the
914 	 * past start time of the current scanout. This is meant to adhere
915 	 * to the OpenML OML_sync_control extension specification.
916 	 *
917 	 * Parameters:
918 	 *
919 	 * crtc:
920 	 *     CRTC for which timestamp should be returned.
921 	 * max_error:
922 	 *     Maximum allowable timestamp error in nanoseconds.
923 	 *     Implementation should strive to provide timestamp
924 	 *     with an error of at most max_error nanoseconds.
925 	 *     Returns true upper bound on error for timestamp.
926 	 * vblank_time:
927 	 *     Target location for returned vblank timestamp.
928 	 * in_vblank_irq:
929 	 *     True when called from drm_crtc_handle_vblank().  Some drivers
930 	 *     need to apply some workarounds for gpu-specific vblank irq quirks
931 	 *     if flag is set.
932 	 *
933 	 * Returns:
934 	 *
935 	 * True on success, false on failure, which means the core should
936 	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
937 	 */
938 	bool (*get_vblank_timestamp)(struct drm_crtc *crtc,
939 				     int *max_error,
940 				     ktime_t *vblank_time,
941 				     bool in_vblank_irq);
942 };
943 
944 /**
945  * struct drm_crtc - central CRTC control structure
946  *
947  * Each CRTC may have one or more connectors associated with it.  This structure
948  * allows the CRTC to be controlled.
949  */
950 struct drm_crtc {
951 	/** @dev: parent DRM device */
952 	struct drm_device *dev;
953 	/** @port: OF node used by drm_of_find_possible_crtcs(). */
954 	struct device_node *port;
955 	/**
956 	 * @head:
957 	 *
958 	 * List of all CRTCs on @dev, linked from &drm_mode_config.crtc_list.
959 	 * Invariant over the lifetime of @dev and therefore does not need
960 	 * locking.
961 	 */
962 	struct list_head head;
963 
964 	/** @name: human readable name, can be overwritten by the driver */
965 	char *name;
966 
967 	/**
968 	 * @mutex:
969 	 *
970 	 * This provides a read lock for the overall CRTC state (mode, dpms
971 	 * state, ...) and a write lock for everything which can be update
972 	 * without a full modeset (fb, cursor data, CRTC properties ...). A full
973 	 * modeset also need to grab &drm_mode_config.connection_mutex.
974 	 *
975 	 * For atomic drivers specifically this protects @state.
976 	 */
977 	struct drm_modeset_lock mutex;
978 
979 	/** @base: base KMS object for ID tracking etc. */
980 	struct drm_mode_object base;
981 
982 	/**
983 	 * @primary:
984 	 * Primary plane for this CRTC. Note that this is only
985 	 * relevant for legacy IOCTL, it specifies the plane implicitly used by
986 	 * the SETCRTC and PAGE_FLIP IOCTLs. It does not have any significance
987 	 * beyond that.
988 	 */
989 	struct drm_plane *primary;
990 
991 	/**
992 	 * @cursor:
993 	 * Cursor plane for this CRTC. Note that this is only relevant for
994 	 * legacy IOCTL, it specifies the plane implicitly used by the SETCURSOR
995 	 * and SETCURSOR2 IOCTLs. It does not have any significance
996 	 * beyond that.
997 	 */
998 	struct drm_plane *cursor;
999 
1000 	/**
1001 	 * @index: Position inside the mode_config.list, can be used as an array
1002 	 * index. It is invariant over the lifetime of the CRTC.
1003 	 */
1004 	unsigned index;
1005 
1006 	/**
1007 	 * @cursor_x: Current x position of the cursor, used for universal
1008 	 * cursor planes because the SETCURSOR IOCTL only can update the
1009 	 * framebuffer without supplying the coordinates. Drivers should not use
1010 	 * this directly, atomic drivers should look at &drm_plane_state.crtc_x
1011 	 * of the cursor plane instead.
1012 	 */
1013 	int cursor_x;
1014 	/**
1015 	 * @cursor_y: Current y position of the cursor, used for universal
1016 	 * cursor planes because the SETCURSOR IOCTL only can update the
1017 	 * framebuffer without supplying the coordinates. Drivers should not use
1018 	 * this directly, atomic drivers should look at &drm_plane_state.crtc_y
1019 	 * of the cursor plane instead.
1020 	 */
1021 	int cursor_y;
1022 
1023 	/**
1024 	 * @enabled:
1025 	 *
1026 	 * Is this CRTC enabled? Should only be used by legacy drivers, atomic
1027 	 * drivers should instead consult &drm_crtc_state.enable and
1028 	 * &drm_crtc_state.active. Atomic drivers can update this by calling
1029 	 * drm_atomic_helper_update_legacy_modeset_state().
1030 	 */
1031 	bool enabled;
1032 
1033 	/**
1034 	 * @mode:
1035 	 *
1036 	 * Current mode timings. Should only be used by legacy drivers, atomic
1037 	 * drivers should instead consult &drm_crtc_state.mode. Atomic drivers
1038 	 * can update this by calling
1039 	 * drm_atomic_helper_update_legacy_modeset_state().
1040 	 */
1041 	struct drm_display_mode mode;
1042 
1043 	/**
1044 	 * @hwmode:
1045 	 *
1046 	 * Programmed mode in hw, after adjustments for encoders, crtc, panel
1047 	 * scaling etc. Should only be used by legacy drivers, for high
1048 	 * precision vblank timestamps in
1049 	 * drm_crtc_vblank_helper_get_vblank_timestamp().
1050 	 *
1051 	 * Note that atomic drivers should not use this, but instead use
1052 	 * &drm_crtc_state.adjusted_mode. And for high-precision timestamps
1053 	 * drm_crtc_vblank_helper_get_vblank_timestamp() used
1054 	 * &drm_vblank_crtc.hwmode,
1055 	 * which is filled out by calling drm_calc_timestamping_constants().
1056 	 */
1057 	struct drm_display_mode hwmode;
1058 
1059 	/**
1060 	 * @x:
1061 	 * x position on screen. Should only be used by legacy drivers, atomic
1062 	 * drivers should look at &drm_plane_state.crtc_x of the primary plane
1063 	 * instead. Updated by calling
1064 	 * drm_atomic_helper_update_legacy_modeset_state().
1065 	 */
1066 	int x;
1067 	/**
1068 	 * @y:
1069 	 * y position on screen. Should only be used by legacy drivers, atomic
1070 	 * drivers should look at &drm_plane_state.crtc_y of the primary plane
1071 	 * instead. Updated by calling
1072 	 * drm_atomic_helper_update_legacy_modeset_state().
1073 	 */
1074 	int y;
1075 
1076 	/** @funcs: CRTC control functions */
1077 	const struct drm_crtc_funcs *funcs;
1078 
1079 	/**
1080 	 * @gamma_size: Size of legacy gamma ramp reported to userspace. Set up
1081 	 * by calling drm_mode_crtc_set_gamma_size().
1082 	 *
1083 	 * Note that atomic drivers need to instead use
1084 	 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt().
1085 	 */
1086 	uint32_t gamma_size;
1087 
1088 	/**
1089 	 * @gamma_store: Gamma ramp values used by the legacy SETGAMMA and
1090 	 * GETGAMMA IOCTls. Set up by calling drm_mode_crtc_set_gamma_size().
1091 	 *
1092 	 * Note that atomic drivers need to instead use
1093 	 * &drm_crtc_state.gamma_lut. See drm_crtc_enable_color_mgmt().
1094 	 */
1095 	uint16_t *gamma_store;
1096 
1097 	/** @helper_private: mid-layer private data */
1098 	const struct drm_crtc_helper_funcs *helper_private;
1099 
1100 	/** @properties: property tracking for this CRTC */
1101 	struct drm_object_properties properties;
1102 
1103 	/**
1104 	 * @scaling_filter_property: property to apply a particular filter while
1105 	 * scaling.
1106 	 */
1107 	struct drm_property *scaling_filter_property;
1108 
1109 	/**
1110 	 * @state:
1111 	 *
1112 	 * Current atomic state for this CRTC.
1113 	 *
1114 	 * This is protected by @mutex. Note that nonblocking atomic commits
1115 	 * access the current CRTC state without taking locks. Either by going
1116 	 * through the &struct drm_atomic_state pointers, see
1117 	 * for_each_oldnew_crtc_in_state(), for_each_old_crtc_in_state() and
1118 	 * for_each_new_crtc_in_state(). Or through careful ordering of atomic
1119 	 * commit operations as implemented in the atomic helpers, see
1120 	 * &struct drm_crtc_commit.
1121 	 */
1122 	struct drm_crtc_state *state;
1123 
1124 	/**
1125 	 * @commit_list:
1126 	 *
1127 	 * List of &drm_crtc_commit structures tracking pending commits.
1128 	 * Protected by @commit_lock. This list holds its own full reference,
1129 	 * as does the ongoing commit.
1130 	 *
1131 	 * "Note that the commit for a state change is also tracked in
1132 	 * &drm_crtc_state.commit. For accessing the immediately preceding
1133 	 * commit in an atomic update it is recommended to just use that
1134 	 * pointer in the old CRTC state, since accessing that doesn't need
1135 	 * any locking or list-walking. @commit_list should only be used to
1136 	 * stall for framebuffer cleanup that's signalled through
1137 	 * &drm_crtc_commit.cleanup_done."
1138 	 */
1139 	struct list_head commit_list;
1140 
1141 	/**
1142 	 * @commit_lock:
1143 	 *
1144 	 * Spinlock to protect @commit_list.
1145 	 */
1146 	spinlock_t commit_lock;
1147 
1148 	/**
1149 	 * @debugfs_entry:
1150 	 *
1151 	 * Debugfs directory for this CRTC.
1152 	 */
1153 	struct dentry *debugfs_entry;
1154 
1155 	/**
1156 	 * @crc:
1157 	 *
1158 	 * Configuration settings of CRC capture.
1159 	 */
1160 	struct drm_crtc_crc crc;
1161 
1162 	/**
1163 	 * @fence_context:
1164 	 *
1165 	 * timeline context used for fence operations.
1166 	 */
1167 	unsigned int fence_context;
1168 
1169 	/**
1170 	 * @fence_lock:
1171 	 *
1172 	 * spinlock to protect the fences in the fence_context.
1173 	 */
1174 	spinlock_t fence_lock;
1175 	/**
1176 	 * @fence_seqno:
1177 	 *
1178 	 * Seqno variable used as monotonic counter for the fences
1179 	 * created on the CRTC's timeline.
1180 	 */
1181 	unsigned long fence_seqno;
1182 
1183 	/**
1184 	 * @timeline_name:
1185 	 *
1186 	 * The name of the CRTC's fence timeline.
1187 	 */
1188 	char timeline_name[32];
1189 
1190 	/**
1191 	 * @self_refresh_data: Holds the state for the self refresh helpers
1192 	 *
1193 	 * Initialized via drm_self_refresh_helper_init().
1194 	 */
1195 	struct drm_self_refresh_data *self_refresh_data;
1196 };
1197 
1198 /**
1199  * struct drm_mode_set - new values for a CRTC config change
1200  * @fb: framebuffer to use for new config
1201  * @crtc: CRTC whose configuration we're about to change
1202  * @mode: mode timings to use
1203  * @x: position of this CRTC relative to @fb
1204  * @y: position of this CRTC relative to @fb
1205  * @connectors: array of connectors to drive with this CRTC if possible
1206  * @num_connectors: size of @connectors array
1207  *
1208  * This represents a modeset configuration for the legacy SETCRTC ioctl and is
1209  * also used internally. Atomic drivers instead use &drm_atomic_state.
1210  */
1211 struct drm_mode_set {
1212 	struct drm_framebuffer *fb;
1213 	struct drm_crtc *crtc;
1214 	struct drm_display_mode *mode;
1215 
1216 	uint32_t x;
1217 	uint32_t y;
1218 
1219 	struct drm_connector **connectors;
1220 	size_t num_connectors;
1221 };
1222 
1223 #define obj_to_crtc(x) container_of(x, struct drm_crtc, base)
1224 
1225 __printf(6, 7)
1226 int drm_crtc_init_with_planes(struct drm_device *dev,
1227 			      struct drm_crtc *crtc,
1228 			      struct drm_plane *primary,
1229 			      struct drm_plane *cursor,
1230 			      const struct drm_crtc_funcs *funcs,
1231 			      const char *name, ...);
1232 void drm_crtc_cleanup(struct drm_crtc *crtc);
1233 
1234 __printf(7, 8)
1235 void *__drmm_crtc_alloc_with_planes(struct drm_device *dev,
1236 				    size_t size, size_t offset,
1237 				    struct drm_plane *primary,
1238 				    struct drm_plane *cursor,
1239 				    const struct drm_crtc_funcs *funcs,
1240 				    const char *name, ...);
1241 
1242 /**
1243  * drmm_crtc_alloc_with_planes - Allocate and initialize a new CRTC object with
1244  *    specified primary and cursor planes.
1245  * @dev: DRM device
1246  * @type: the type of the struct which contains struct &drm_crtc
1247  * @member: the name of the &drm_crtc within @type.
1248  * @primary: Primary plane for CRTC
1249  * @cursor: Cursor plane for CRTC
1250  * @funcs: callbacks for the new CRTC
1251  * @name: printf style format string for the CRTC name, or NULL for default name
1252  *
1253  * Allocates and initializes a new crtc object. Cleanup is automatically
1254  * handled through registering drmm_crtc_cleanup() with drmm_add_action().
1255  *
1256  * The @drm_crtc_funcs.destroy hook must be NULL.
1257  *
1258  * Returns:
1259  * Pointer to new crtc, or ERR_PTR on failure.
1260  */
1261 #define drmm_crtc_alloc_with_planes(dev, type, member, primary, cursor, funcs, name, ...) \
1262 	((type *)__drmm_crtc_alloc_with_planes(dev, sizeof(type), \
1263 					       offsetof(type, member), \
1264 					       primary, cursor, funcs, \
1265 					       name, ##__VA_ARGS__))
1266 
1267 /**
1268  * drm_crtc_index - find the index of a registered CRTC
1269  * @crtc: CRTC to find index for
1270  *
1271  * Given a registered CRTC, return the index of that CRTC within a DRM
1272  * device's list of CRTCs.
1273  */
drm_crtc_index(const struct drm_crtc * crtc)1274 static inline unsigned int drm_crtc_index(const struct drm_crtc *crtc)
1275 {
1276 	return crtc->index;
1277 }
1278 
1279 /**
1280  * drm_crtc_mask - find the mask of a registered CRTC
1281  * @crtc: CRTC to find mask for
1282  *
1283  * Given a registered CRTC, return the mask bit of that CRTC for the
1284  * &drm_encoder.possible_crtcs and &drm_plane.possible_crtcs fields.
1285  */
drm_crtc_mask(const struct drm_crtc * crtc)1286 static inline uint32_t drm_crtc_mask(const struct drm_crtc *crtc)
1287 {
1288 	return 1 << drm_crtc_index(crtc);
1289 }
1290 
1291 int drm_mode_set_config_internal(struct drm_mode_set *set);
1292 struct drm_crtc *drm_crtc_from_index(struct drm_device *dev, int idx);
1293 
1294 /**
1295  * drm_crtc_find - look up a CRTC object from its ID
1296  * @dev: DRM device
1297  * @file_priv: drm file to check for lease against.
1298  * @id: &drm_mode_object ID
1299  *
1300  * This can be used to look up a CRTC from its userspace ID. Only used by
1301  * drivers for legacy IOCTLs and interface, nowadays extensions to the KMS
1302  * userspace interface should be done using &drm_property.
1303  */
drm_crtc_find(struct drm_device * dev,struct drm_file * file_priv,uint32_t id)1304 static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
1305 		struct drm_file *file_priv,
1306 		uint32_t id)
1307 {
1308 	struct drm_mode_object *mo;
1309 	mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_CRTC);
1310 	return mo ? obj_to_crtc(mo) : NULL;
1311 }
1312 
1313 /**
1314  * drm_for_each_crtc - iterate over all CRTCs
1315  * @crtc: a &struct drm_crtc as the loop cursor
1316  * @dev: the &struct drm_device
1317  *
1318  * Iterate over all CRTCs of @dev.
1319  */
1320 #define drm_for_each_crtc(crtc, dev) \
1321 	list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
1322 
1323 /**
1324  * drm_for_each_crtc_reverse - iterate over all CRTCs in reverse order
1325  * @crtc: a &struct drm_crtc as the loop cursor
1326  * @dev: the &struct drm_device
1327  *
1328  * Iterate over all CRTCs of @dev.
1329  */
1330 #define drm_for_each_crtc_reverse(crtc, dev) \
1331 	list_for_each_entry_reverse(crtc, &(dev)->mode_config.crtc_list, head)
1332 
1333 int drm_crtc_create_scaling_filter_property(struct drm_crtc *crtc,
1334 					    unsigned int supported_filters);
1335 
1336 #endif /* __DRM_CRTC_H__ */
1337