Line data Source code
1 : /*
2 : * Copyright (c) 2006-2008 Intel Corporation
3 : * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 : *
5 : * DRM core CRTC related functions
6 : *
7 : * Permission to use, copy, modify, distribute, and sell this software and its
8 : * documentation for any purpose is hereby granted without fee, provided that
9 : * the above copyright notice appear in all copies and that both that copyright
10 : * notice and this permission notice appear in supporting documentation, and
11 : * that the name of the copyright holders not be used in advertising or
12 : * publicity pertaining to distribution of the software without specific,
13 : * written prior permission. The copyright holders make no representations
14 : * about the suitability of this software for any purpose. It is provided "as
15 : * is" without express or implied warranty.
16 : *
17 : * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 : * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 : * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 : * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 : * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 : * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 : * OF THIS SOFTWARE.
24 : *
25 : * Authors:
26 : * Keith Packard
27 : * Eric Anholt <eric@anholt.net>
28 : * Dave Airlie <airlied@linux.ie>
29 : * Jesse Barnes <jesse.barnes@intel.com>
30 : */
31 :
32 : #include <linux/export.h>
33 : #include <linux/kernel.h>
34 : #include <linux/moduleparam.h>
35 : #include <linux/dynamic_debug.h>
36 :
37 : #include <drm/drm_atomic.h>
38 : #include <drm/drm_atomic_helper.h>
39 : #include <drm/drm_atomic_uapi.h>
40 : #include <drm/drm_bridge.h>
41 : #include <drm/drm_crtc.h>
42 : #include <drm/drm_crtc_helper.h>
43 : #include <drm/drm_drv.h>
44 : #include <drm/drm_edid.h>
45 : #include <drm/drm_encoder.h>
46 : #include <drm/drm_fourcc.h>
47 : #include <drm/drm_framebuffer.h>
48 : #include <drm/drm_print.h>
49 : #include <drm/drm_vblank.h>
50 :
51 : #include "drm_crtc_helper_internal.h"
52 :
53 : DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
54 : "DRM_UT_CORE",
55 : "DRM_UT_DRIVER",
56 : "DRM_UT_KMS",
57 : "DRM_UT_PRIME",
58 : "DRM_UT_ATOMIC",
59 : "DRM_UT_VBL",
60 : "DRM_UT_STATE",
61 : "DRM_UT_LEASE",
62 : "DRM_UT_DP",
63 : "DRM_UT_DRMRES");
64 :
65 : /**
66 : * DOC: overview
67 : *
68 : * The CRTC modeset helper library provides a default set_config implementation
69 : * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
70 : * the same callbacks which drivers can use to e.g. restore the modeset
71 : * configuration on resume with drm_helper_resume_force_mode().
72 : *
73 : * Note that this helper library doesn't track the current power state of CRTCs
74 : * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
75 : * though the hardware is already in the desired state. This deficiency has been
76 : * fixed in the atomic helpers.
77 : *
78 : * The driver callbacks are mostly compatible with the atomic modeset helpers,
79 : * except for the handling of the primary plane: Atomic helpers require that the
80 : * primary plane is implemented as a real standalone plane and not directly tied
81 : * to the CRTC state. For easier transition this library provides functions to
82 : * implement the old semantics required by the CRTC helpers using the new plane
83 : * and atomic helper callbacks.
84 : *
85 : * Drivers are strongly urged to convert to the atomic helpers (by way of first
86 : * converting to the plane helpers). New drivers must not use these functions
87 : * but need to implement the atomic interface instead, potentially using the
88 : * atomic helpers for that.
89 : *
90 : * These legacy modeset helpers use the same function table structures as
91 : * all other modesetting helpers. See the documentation for struct
92 : * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
93 : * &drm_connector_helper_funcs.
94 : */
95 :
96 : /**
97 : * drm_helper_encoder_in_use - check if a given encoder is in use
98 : * @encoder: encoder to check
99 : *
100 : * Checks whether @encoder is with the current mode setting output configuration
101 : * in use by any connector. This doesn't mean that it is actually enabled since
102 : * the DPMS state is tracked separately.
103 : *
104 : * Returns:
105 : * True if @encoder is used, false otherwise.
106 : */
107 0 : bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
108 : {
109 : struct drm_connector *connector;
110 : struct drm_connector_list_iter conn_iter;
111 0 : struct drm_device *dev = encoder->dev;
112 :
113 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
114 :
115 : /*
116 : * We can expect this mutex to be locked if we are not panicking.
117 : * Locking is currently fubar in the panic handler.
118 : */
119 0 : if (!oops_in_progress) {
120 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
121 0 : WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
122 : }
123 :
124 :
125 0 : drm_connector_list_iter_begin(dev, &conn_iter);
126 0 : drm_for_each_connector_iter(connector, &conn_iter) {
127 0 : if (connector->encoder == encoder) {
128 0 : drm_connector_list_iter_end(&conn_iter);
129 0 : return true;
130 : }
131 : }
132 0 : drm_connector_list_iter_end(&conn_iter);
133 0 : return false;
134 : }
135 : EXPORT_SYMBOL(drm_helper_encoder_in_use);
136 :
137 : /**
138 : * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
139 : * @crtc: CRTC to check
140 : *
141 : * Checks whether @crtc is with the current mode setting output configuration
142 : * in use by any connector. This doesn't mean that it is actually enabled since
143 : * the DPMS state is tracked separately.
144 : *
145 : * Returns:
146 : * True if @crtc is used, false otherwise.
147 : */
148 0 : bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
149 : {
150 : struct drm_encoder *encoder;
151 0 : struct drm_device *dev = crtc->dev;
152 :
153 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
154 :
155 : /*
156 : * We can expect this mutex to be locked if we are not panicking.
157 : * Locking is currently fubar in the panic handler.
158 : */
159 0 : if (!oops_in_progress)
160 0 : WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
161 :
162 0 : drm_for_each_encoder(encoder, dev)
163 0 : if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
164 : return true;
165 : return false;
166 : }
167 : EXPORT_SYMBOL(drm_helper_crtc_in_use);
168 :
169 : static void
170 0 : drm_encoder_disable(struct drm_encoder *encoder)
171 : {
172 0 : const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
173 :
174 0 : if (!encoder_funcs)
175 : return;
176 :
177 0 : if (encoder_funcs->disable)
178 0 : (*encoder_funcs->disable)(encoder);
179 0 : else if (encoder_funcs->dpms)
180 0 : (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
181 : }
182 :
183 0 : static void __drm_helper_disable_unused_functions(struct drm_device *dev)
184 : {
185 : struct drm_encoder *encoder;
186 : struct drm_crtc *crtc;
187 :
188 0 : drm_warn_on_modeset_not_all_locked(dev);
189 :
190 0 : drm_for_each_encoder(encoder, dev) {
191 0 : if (!drm_helper_encoder_in_use(encoder)) {
192 0 : drm_encoder_disable(encoder);
193 : /* disconnect encoder from any connector */
194 0 : encoder->crtc = NULL;
195 : }
196 : }
197 :
198 0 : drm_for_each_crtc(crtc, dev) {
199 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
200 :
201 0 : crtc->enabled = drm_helper_crtc_in_use(crtc);
202 0 : if (!crtc->enabled) {
203 0 : if (crtc_funcs->disable)
204 0 : (*crtc_funcs->disable)(crtc);
205 : else
206 0 : (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
207 0 : crtc->primary->fb = NULL;
208 : }
209 : }
210 0 : }
211 :
212 : /**
213 : * drm_helper_disable_unused_functions - disable unused objects
214 : * @dev: DRM device
215 : *
216 : * This function walks through the entire mode setting configuration of @dev. It
217 : * will remove any CRTC links of unused encoders and encoder links of
218 : * disconnected connectors. Then it will disable all unused encoders and CRTCs
219 : * either by calling their disable callback if available or by calling their
220 : * dpms callback with DRM_MODE_DPMS_OFF.
221 : *
222 : * NOTE:
223 : *
224 : * This function is part of the legacy modeset helper library and will cause
225 : * major confusion with atomic drivers. This is because atomic helpers guarantee
226 : * to never call ->disable() hooks on a disabled function, or ->enable() hooks
227 : * on an enabled functions. drm_helper_disable_unused_functions() on the other
228 : * hand throws such guarantees into the wind and calls disable hooks
229 : * unconditionally on unused functions.
230 : */
231 0 : void drm_helper_disable_unused_functions(struct drm_device *dev)
232 : {
233 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
234 :
235 0 : drm_modeset_lock_all(dev);
236 0 : __drm_helper_disable_unused_functions(dev);
237 0 : drm_modeset_unlock_all(dev);
238 0 : }
239 : EXPORT_SYMBOL(drm_helper_disable_unused_functions);
240 :
241 : /*
242 : * Check the CRTC we're going to map each output to vs. its current
243 : * CRTC. If they don't match, we have to disable the output and the CRTC
244 : * since the driver will have to re-route things.
245 : */
246 : static void
247 0 : drm_crtc_prepare_encoders(struct drm_device *dev)
248 : {
249 : const struct drm_encoder_helper_funcs *encoder_funcs;
250 : struct drm_encoder *encoder;
251 :
252 0 : drm_for_each_encoder(encoder, dev) {
253 0 : encoder_funcs = encoder->helper_private;
254 0 : if (!encoder_funcs)
255 0 : continue;
256 :
257 : /* Disable unused encoders */
258 0 : if (encoder->crtc == NULL)
259 0 : drm_encoder_disable(encoder);
260 : }
261 0 : }
262 :
263 : /**
264 : * drm_crtc_helper_set_mode - internal helper to set a mode
265 : * @crtc: CRTC to program
266 : * @mode: mode to use
267 : * @x: horizontal offset into the surface
268 : * @y: vertical offset into the surface
269 : * @old_fb: old framebuffer, for cleanup
270 : *
271 : * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
272 : * to fixup or reject the mode prior to trying to set it. This is an internal
273 : * helper that drivers could e.g. use to update properties that require the
274 : * entire output pipe to be disabled and re-enabled in a new configuration. For
275 : * example for changing whether audio is enabled on a hdmi link or for changing
276 : * panel fitter or dither attributes. It is also called by the
277 : * drm_crtc_helper_set_config() helper function to drive the mode setting
278 : * sequence.
279 : *
280 : * Returns:
281 : * True if the mode was set successfully, false otherwise.
282 : */
283 0 : bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
284 : struct drm_display_mode *mode,
285 : int x, int y,
286 : struct drm_framebuffer *old_fb)
287 : {
288 0 : struct drm_device *dev = crtc->dev;
289 : struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
290 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
291 : const struct drm_encoder_helper_funcs *encoder_funcs;
292 : int saved_x, saved_y;
293 : bool saved_enabled;
294 : struct drm_encoder *encoder;
295 0 : bool ret = true;
296 :
297 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
298 :
299 0 : drm_warn_on_modeset_not_all_locked(dev);
300 :
301 0 : saved_enabled = crtc->enabled;
302 0 : crtc->enabled = drm_helper_crtc_in_use(crtc);
303 0 : if (!crtc->enabled)
304 : return true;
305 :
306 0 : adjusted_mode = drm_mode_duplicate(dev, mode);
307 0 : if (!adjusted_mode) {
308 0 : crtc->enabled = saved_enabled;
309 0 : return false;
310 : }
311 :
312 0 : drm_mode_init(&saved_mode, &crtc->mode);
313 0 : drm_mode_init(&saved_hwmode, &crtc->hwmode);
314 0 : saved_x = crtc->x;
315 0 : saved_y = crtc->y;
316 :
317 : /* Update crtc values up front so the driver can rely on them for mode
318 : * setting.
319 : */
320 0 : drm_mode_copy(&crtc->mode, mode);
321 0 : crtc->x = x;
322 0 : crtc->y = y;
323 :
324 : /* Pass our mode to the connectors and the CRTC to give them a chance to
325 : * adjust it according to limitations or connector properties, and also
326 : * a chance to reject the mode entirely.
327 : */
328 0 : drm_for_each_encoder(encoder, dev) {
329 :
330 0 : if (encoder->crtc != crtc)
331 0 : continue;
332 :
333 0 : encoder_funcs = encoder->helper_private;
334 0 : if (!encoder_funcs)
335 0 : continue;
336 :
337 0 : encoder_funcs = encoder->helper_private;
338 0 : if (encoder_funcs->mode_fixup) {
339 0 : if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
340 : adjusted_mode))) {
341 0 : DRM_DEBUG_KMS("Encoder fixup failed\n");
342 0 : goto done;
343 : }
344 : }
345 : }
346 :
347 0 : if (crtc_funcs->mode_fixup) {
348 0 : if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
349 : adjusted_mode))) {
350 0 : DRM_DEBUG_KMS("CRTC fixup failed\n");
351 0 : goto done;
352 : }
353 : }
354 0 : DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
355 :
356 0 : drm_mode_copy(&crtc->hwmode, adjusted_mode);
357 :
358 : /* Prepare the encoders and CRTCs before setting the mode. */
359 0 : drm_for_each_encoder(encoder, dev) {
360 :
361 0 : if (encoder->crtc != crtc)
362 0 : continue;
363 :
364 0 : encoder_funcs = encoder->helper_private;
365 0 : if (!encoder_funcs)
366 0 : continue;
367 :
368 : /* Disable the encoders as the first thing we do. */
369 0 : if (encoder_funcs->prepare)
370 0 : encoder_funcs->prepare(encoder);
371 : }
372 :
373 0 : drm_crtc_prepare_encoders(dev);
374 :
375 0 : crtc_funcs->prepare(crtc);
376 :
377 : /* Set up the DPLL and any encoders state that needs to adjust or depend
378 : * on the DPLL.
379 : */
380 0 : ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
381 0 : if (!ret)
382 : goto done;
383 :
384 0 : drm_for_each_encoder(encoder, dev) {
385 :
386 0 : if (encoder->crtc != crtc)
387 0 : continue;
388 :
389 0 : encoder_funcs = encoder->helper_private;
390 0 : if (!encoder_funcs)
391 0 : continue;
392 :
393 0 : DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
394 : encoder->base.id, encoder->name, mode->name);
395 0 : if (encoder_funcs->mode_set)
396 0 : encoder_funcs->mode_set(encoder, mode, adjusted_mode);
397 : }
398 :
399 : /* Now enable the clocks, plane, pipe, and connectors that we set up. */
400 0 : crtc_funcs->commit(crtc);
401 :
402 0 : drm_for_each_encoder(encoder, dev) {
403 :
404 0 : if (encoder->crtc != crtc)
405 0 : continue;
406 :
407 0 : encoder_funcs = encoder->helper_private;
408 0 : if (!encoder_funcs)
409 0 : continue;
410 :
411 0 : if (encoder_funcs->commit)
412 0 : encoder_funcs->commit(encoder);
413 : }
414 :
415 : /* Calculate and store various constants which
416 : * are later needed by vblank and swap-completion
417 : * timestamping. They are derived from true hwmode.
418 : */
419 0 : drm_calc_timestamping_constants(crtc, &crtc->hwmode);
420 :
421 : /* FIXME: add subpixel order */
422 : done:
423 0 : drm_mode_destroy(dev, adjusted_mode);
424 0 : if (!ret) {
425 0 : crtc->enabled = saved_enabled;
426 0 : drm_mode_copy(&crtc->mode, &saved_mode);
427 0 : drm_mode_copy(&crtc->hwmode, &saved_hwmode);
428 0 : crtc->x = saved_x;
429 0 : crtc->y = saved_y;
430 : }
431 :
432 : return ret;
433 : }
434 : EXPORT_SYMBOL(drm_crtc_helper_set_mode);
435 :
436 : /**
437 : * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state
438 : * @crtc: CRTC to check
439 : * @state: atomic state object
440 : *
441 : * Provides a default CRTC-state check handler for CRTCs that only have
442 : * one primary plane attached to it.
443 : *
444 : * This is often the case for the CRTC of simple framebuffers. See also
445 : * drm_plane_helper_atomic_check() for the respective plane-state check
446 : * helper function.
447 : *
448 : * RETURNS:
449 : * Zero on success, or an errno code otherwise.
450 : */
451 0 : int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
452 : {
453 0 : struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
454 :
455 0 : if (!new_crtc_state->enable)
456 : return 0;
457 :
458 0 : return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
459 : }
460 : EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
461 :
462 : static void
463 0 : drm_crtc_helper_disable(struct drm_crtc *crtc)
464 : {
465 0 : struct drm_device *dev = crtc->dev;
466 : struct drm_connector *connector;
467 : struct drm_encoder *encoder;
468 :
469 : /* Decouple all encoders and their attached connectors from this crtc */
470 0 : drm_for_each_encoder(encoder, dev) {
471 : struct drm_connector_list_iter conn_iter;
472 :
473 0 : if (encoder->crtc != crtc)
474 0 : continue;
475 :
476 0 : drm_connector_list_iter_begin(dev, &conn_iter);
477 0 : drm_for_each_connector_iter(connector, &conn_iter) {
478 0 : if (connector->encoder != encoder)
479 0 : continue;
480 :
481 0 : connector->encoder = NULL;
482 :
483 : /*
484 : * drm_helper_disable_unused_functions() ought to be
485 : * doing this, but since we've decoupled the encoder
486 : * from the connector above, the required connection
487 : * between them is henceforth no longer available.
488 : */
489 0 : connector->dpms = DRM_MODE_DPMS_OFF;
490 :
491 : /* we keep a reference while the encoder is bound */
492 : drm_connector_put(connector);
493 : }
494 0 : drm_connector_list_iter_end(&conn_iter);
495 : }
496 :
497 0 : __drm_helper_disable_unused_functions(dev);
498 0 : }
499 :
500 : /*
501 : * For connectors that support multiple encoders, either the
502 : * .atomic_best_encoder() or .best_encoder() operation must be implemented.
503 : */
504 : struct drm_encoder *
505 0 : drm_connector_get_single_encoder(struct drm_connector *connector)
506 : {
507 : struct drm_encoder *encoder;
508 :
509 0 : WARN_ON(hweight32(connector->possible_encoders) > 1);
510 0 : drm_connector_for_each_possible_encoder(connector, encoder)
511 : return encoder;
512 :
513 : return NULL;
514 : }
515 :
516 : /**
517 : * drm_crtc_helper_set_config - set a new config from userspace
518 : * @set: mode set configuration
519 : * @ctx: lock acquire context, not used here
520 : *
521 : * The drm_crtc_helper_set_config() helper function implements the of
522 : * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
523 : * helpers.
524 : *
525 : * It first tries to locate the best encoder for each connector by calling the
526 : * connector @drm_connector_helper_funcs.best_encoder helper operation.
527 : *
528 : * After locating the appropriate encoders, the helper function will call the
529 : * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
530 : * or reject it completely in which case an error will be returned to the
531 : * application. If the new configuration after mode adjustment is identical to
532 : * the current configuration the helper function will return without performing
533 : * any other operation.
534 : *
535 : * If the adjusted mode is identical to the current mode but changes to the
536 : * frame buffer need to be applied, the drm_crtc_helper_set_config() function
537 : * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
538 : *
539 : * If the adjusted mode differs from the current mode, or if the
540 : * ->mode_set_base() helper operation is not provided, the helper function
541 : * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
542 : * and ->commit() CRTC and encoder helper operations, in that order.
543 : * Alternatively it can also use the dpms and disable helper operations. For
544 : * details see &struct drm_crtc_helper_funcs and struct
545 : * &drm_encoder_helper_funcs.
546 : *
547 : * This function is deprecated. New drivers must implement atomic modeset
548 : * support, for which this function is unsuitable. Instead drivers should use
549 : * drm_atomic_helper_set_config().
550 : *
551 : * Returns:
552 : * Returns 0 on success, negative errno numbers on failure.
553 : */
554 0 : int drm_crtc_helper_set_config(struct drm_mode_set *set,
555 : struct drm_modeset_acquire_ctx *ctx)
556 : {
557 : struct drm_device *dev;
558 : struct drm_crtc **save_encoder_crtcs, *new_crtc;
559 : struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
560 0 : bool mode_changed = false; /* if true do a full mode set */
561 0 : bool fb_changed = false; /* if true and !mode_changed just do a flip */
562 : struct drm_connector *connector;
563 : struct drm_connector_list_iter conn_iter;
564 0 : int count = 0, ro, fail = 0;
565 : const struct drm_crtc_helper_funcs *crtc_funcs;
566 : struct drm_mode_set save_set;
567 : int ret;
568 : int i;
569 :
570 0 : DRM_DEBUG_KMS("\n");
571 :
572 0 : BUG_ON(!set);
573 0 : BUG_ON(!set->crtc);
574 0 : BUG_ON(!set->crtc->helper_private);
575 :
576 : /* Enforce sane interface api - has been abused by the fb helper. */
577 0 : BUG_ON(!set->mode && set->fb);
578 0 : BUG_ON(set->fb && set->num_connectors == 0);
579 :
580 0 : crtc_funcs = set->crtc->helper_private;
581 :
582 0 : dev = set->crtc->dev;
583 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
584 :
585 0 : if (!set->mode)
586 0 : set->fb = NULL;
587 :
588 0 : if (set->fb) {
589 0 : DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
590 : set->crtc->base.id, set->crtc->name,
591 : set->fb->base.id,
592 : (int)set->num_connectors, set->x, set->y);
593 : } else {
594 0 : DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
595 : set->crtc->base.id, set->crtc->name);
596 0 : drm_crtc_helper_disable(set->crtc);
597 0 : return 0;
598 : }
599 :
600 0 : drm_warn_on_modeset_not_all_locked(dev);
601 :
602 : /*
603 : * Allocate space for the backup of all (non-pointer) encoder and
604 : * connector data.
605 : */
606 0 : save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
607 : sizeof(struct drm_crtc *), GFP_KERNEL);
608 0 : if (!save_encoder_crtcs)
609 : return -ENOMEM;
610 :
611 0 : save_connector_encoders = kcalloc(dev->mode_config.num_connector,
612 : sizeof(struct drm_encoder *), GFP_KERNEL);
613 0 : if (!save_connector_encoders) {
614 0 : kfree(save_encoder_crtcs);
615 0 : return -ENOMEM;
616 : }
617 :
618 : /*
619 : * Copy data. Note that driver private data is not affected.
620 : * Should anything bad happen only the expected state is
621 : * restored, not the drivers personal bookkeeping.
622 : */
623 0 : count = 0;
624 0 : drm_for_each_encoder(encoder, dev) {
625 0 : save_encoder_crtcs[count++] = encoder->crtc;
626 : }
627 :
628 0 : count = 0;
629 0 : drm_connector_list_iter_begin(dev, &conn_iter);
630 0 : drm_for_each_connector_iter(connector, &conn_iter)
631 0 : save_connector_encoders[count++] = connector->encoder;
632 0 : drm_connector_list_iter_end(&conn_iter);
633 :
634 0 : save_set.crtc = set->crtc;
635 0 : save_set.mode = &set->crtc->mode;
636 0 : save_set.x = set->crtc->x;
637 0 : save_set.y = set->crtc->y;
638 0 : save_set.fb = set->crtc->primary->fb;
639 :
640 : /* We should be able to check here if the fb has the same properties
641 : * and then just flip_or_move it */
642 0 : if (set->crtc->primary->fb != set->fb) {
643 : /* If we have no fb then treat it as a full mode set */
644 0 : if (set->crtc->primary->fb == NULL) {
645 0 : DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
646 0 : mode_changed = true;
647 0 : } else if (set->fb->format != set->crtc->primary->fb->format) {
648 : mode_changed = true;
649 : } else
650 0 : fb_changed = true;
651 : }
652 :
653 0 : if (set->x != set->crtc->x || set->y != set->crtc->y)
654 0 : fb_changed = true;
655 :
656 0 : if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
657 0 : DRM_DEBUG_KMS("modes are different, full mode set\n");
658 0 : drm_mode_debug_printmodeline(&set->crtc->mode);
659 0 : drm_mode_debug_printmodeline(set->mode);
660 0 : mode_changed = true;
661 : }
662 :
663 : /* take a reference on all unbound connectors in set, reuse the
664 : * already taken reference for bound connectors
665 : */
666 0 : for (ro = 0; ro < set->num_connectors; ro++) {
667 0 : if (set->connectors[ro]->encoder)
668 0 : continue;
669 0 : drm_connector_get(set->connectors[ro]);
670 : }
671 :
672 : /* a) traverse passed in connector list and get encoders for them */
673 0 : count = 0;
674 0 : drm_connector_list_iter_begin(dev, &conn_iter);
675 0 : drm_for_each_connector_iter(connector, &conn_iter) {
676 0 : const struct drm_connector_helper_funcs *connector_funcs =
677 : connector->helper_private;
678 0 : new_encoder = connector->encoder;
679 0 : for (ro = 0; ro < set->num_connectors; ro++) {
680 0 : if (set->connectors[ro] == connector) {
681 0 : if (connector_funcs->best_encoder)
682 0 : new_encoder = connector_funcs->best_encoder(connector);
683 : else
684 0 : new_encoder = drm_connector_get_single_encoder(connector);
685 :
686 : /* if we can't get an encoder for a connector
687 : we are setting now - then fail */
688 0 : if (new_encoder == NULL)
689 : /* don't break so fail path works correct */
690 0 : fail = 1;
691 :
692 0 : if (connector->dpms != DRM_MODE_DPMS_ON) {
693 0 : DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
694 0 : mode_changed = true;
695 : }
696 :
697 : break;
698 : }
699 : }
700 :
701 0 : if (new_encoder != connector->encoder) {
702 0 : DRM_DEBUG_KMS("encoder changed, full mode switch\n");
703 0 : mode_changed = true;
704 : /* If the encoder is reused for another connector, then
705 : * the appropriate crtc will be set later.
706 : */
707 0 : if (connector->encoder)
708 0 : connector->encoder->crtc = NULL;
709 0 : connector->encoder = new_encoder;
710 : }
711 : }
712 0 : drm_connector_list_iter_end(&conn_iter);
713 :
714 0 : if (fail) {
715 : ret = -EINVAL;
716 : goto fail;
717 : }
718 :
719 0 : count = 0;
720 0 : drm_connector_list_iter_begin(dev, &conn_iter);
721 0 : drm_for_each_connector_iter(connector, &conn_iter) {
722 0 : if (!connector->encoder)
723 0 : continue;
724 :
725 0 : if (connector->encoder->crtc == set->crtc)
726 : new_crtc = NULL;
727 : else
728 0 : new_crtc = connector->encoder->crtc;
729 :
730 0 : for (ro = 0; ro < set->num_connectors; ro++) {
731 0 : if (set->connectors[ro] == connector)
732 0 : new_crtc = set->crtc;
733 : }
734 :
735 : /* Make sure the new CRTC will work with the encoder */
736 0 : if (new_crtc &&
737 0 : !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
738 0 : ret = -EINVAL;
739 0 : drm_connector_list_iter_end(&conn_iter);
740 0 : goto fail;
741 : }
742 0 : if (new_crtc != connector->encoder->crtc) {
743 0 : DRM_DEBUG_KMS("crtc changed, full mode switch\n");
744 0 : mode_changed = true;
745 0 : connector->encoder->crtc = new_crtc;
746 : }
747 0 : if (new_crtc) {
748 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
749 : connector->base.id, connector->name,
750 : new_crtc->base.id, new_crtc->name);
751 : } else {
752 0 : DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
753 : connector->base.id, connector->name);
754 : }
755 : }
756 0 : drm_connector_list_iter_end(&conn_iter);
757 :
758 : /* mode_set_base is not a required function */
759 0 : if (fb_changed && !crtc_funcs->mode_set_base)
760 0 : mode_changed = true;
761 :
762 0 : if (mode_changed) {
763 0 : if (drm_helper_crtc_in_use(set->crtc)) {
764 0 : DRM_DEBUG_KMS("attempting to set mode from"
765 : " userspace\n");
766 0 : drm_mode_debug_printmodeline(set->mode);
767 0 : set->crtc->primary->fb = set->fb;
768 0 : if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
769 0 : set->x, set->y,
770 : save_set.fb)) {
771 0 : DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
772 : set->crtc->base.id, set->crtc->name);
773 0 : set->crtc->primary->fb = save_set.fb;
774 0 : ret = -EINVAL;
775 0 : goto fail;
776 : }
777 0 : DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
778 0 : for (i = 0; i < set->num_connectors; i++) {
779 0 : DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
780 : set->connectors[i]->name);
781 0 : set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
782 : }
783 : }
784 0 : __drm_helper_disable_unused_functions(dev);
785 0 : } else if (fb_changed) {
786 0 : set->crtc->x = set->x;
787 0 : set->crtc->y = set->y;
788 0 : set->crtc->primary->fb = set->fb;
789 0 : ret = crtc_funcs->mode_set_base(set->crtc,
790 0 : set->x, set->y, save_set.fb);
791 0 : if (ret != 0) {
792 0 : set->crtc->x = save_set.x;
793 0 : set->crtc->y = save_set.y;
794 0 : set->crtc->primary->fb = save_set.fb;
795 0 : goto fail;
796 : }
797 : }
798 :
799 0 : kfree(save_connector_encoders);
800 0 : kfree(save_encoder_crtcs);
801 0 : return 0;
802 :
803 : fail:
804 : /* Restore all previous data. */
805 0 : count = 0;
806 0 : drm_for_each_encoder(encoder, dev) {
807 0 : encoder->crtc = save_encoder_crtcs[count++];
808 : }
809 :
810 0 : count = 0;
811 0 : drm_connector_list_iter_begin(dev, &conn_iter);
812 0 : drm_for_each_connector_iter(connector, &conn_iter)
813 0 : connector->encoder = save_connector_encoders[count++];
814 0 : drm_connector_list_iter_end(&conn_iter);
815 :
816 : /* after fail drop reference on all unbound connectors in set, let
817 : * bound connectors keep their reference
818 : */
819 0 : for (ro = 0; ro < set->num_connectors; ro++) {
820 0 : if (set->connectors[ro]->encoder)
821 0 : continue;
822 0 : drm_connector_put(set->connectors[ro]);
823 : }
824 :
825 : /* Try to restore the config */
826 0 : if (mode_changed &&
827 0 : !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
828 : save_set.y, save_set.fb))
829 0 : DRM_ERROR("failed to restore config after modeset failure\n");
830 :
831 0 : kfree(save_connector_encoders);
832 0 : kfree(save_encoder_crtcs);
833 0 : return ret;
834 : }
835 : EXPORT_SYMBOL(drm_crtc_helper_set_config);
836 :
837 0 : static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
838 : {
839 0 : int dpms = DRM_MODE_DPMS_OFF;
840 : struct drm_connector *connector;
841 : struct drm_connector_list_iter conn_iter;
842 0 : struct drm_device *dev = encoder->dev;
843 :
844 0 : drm_connector_list_iter_begin(dev, &conn_iter);
845 0 : drm_for_each_connector_iter(connector, &conn_iter)
846 0 : if (connector->encoder == encoder)
847 0 : if (connector->dpms < dpms)
848 0 : dpms = connector->dpms;
849 0 : drm_connector_list_iter_end(&conn_iter);
850 :
851 0 : return dpms;
852 : }
853 :
854 : /* Helper which handles bridge ordering around encoder dpms */
855 : static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
856 : {
857 : const struct drm_encoder_helper_funcs *encoder_funcs;
858 :
859 0 : encoder_funcs = encoder->helper_private;
860 0 : if (!encoder_funcs)
861 : return;
862 :
863 0 : if (encoder_funcs->dpms)
864 0 : encoder_funcs->dpms(encoder, mode);
865 : }
866 :
867 0 : static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
868 : {
869 0 : int dpms = DRM_MODE_DPMS_OFF;
870 : struct drm_connector *connector;
871 : struct drm_connector_list_iter conn_iter;
872 0 : struct drm_device *dev = crtc->dev;
873 :
874 0 : drm_connector_list_iter_begin(dev, &conn_iter);
875 0 : drm_for_each_connector_iter(connector, &conn_iter)
876 0 : if (connector->encoder && connector->encoder->crtc == crtc)
877 0 : if (connector->dpms < dpms)
878 0 : dpms = connector->dpms;
879 0 : drm_connector_list_iter_end(&conn_iter);
880 :
881 0 : return dpms;
882 : }
883 :
884 : /**
885 : * drm_helper_connector_dpms() - connector dpms helper implementation
886 : * @connector: affected connector
887 : * @mode: DPMS mode
888 : *
889 : * The drm_helper_connector_dpms() helper function implements the
890 : * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
891 : * helpers.
892 : *
893 : * This is the main helper function provided by the CRTC helper framework for
894 : * implementing the DPMS connector attribute. It computes the new desired DPMS
895 : * state for all encoders and CRTCs in the output mesh and calls the
896 : * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
897 : * provided by the driver.
898 : *
899 : * This function is deprecated. New drivers must implement atomic modeset
900 : * support, where DPMS is handled in the DRM core.
901 : *
902 : * Returns:
903 : * Always returns 0.
904 : */
905 0 : int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
906 : {
907 0 : struct drm_encoder *encoder = connector->encoder;
908 0 : struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
909 0 : int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
910 :
911 0 : WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
912 :
913 0 : if (mode == connector->dpms)
914 : return 0;
915 :
916 0 : old_dpms = connector->dpms;
917 0 : connector->dpms = mode;
918 :
919 0 : if (encoder)
920 0 : encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
921 :
922 : /* from off to on, do crtc then encoder */
923 0 : if (mode < old_dpms) {
924 0 : if (crtc) {
925 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
926 :
927 0 : if (crtc_funcs->dpms)
928 0 : (*crtc_funcs->dpms) (crtc,
929 : drm_helper_choose_crtc_dpms(crtc));
930 : }
931 0 : if (encoder)
932 : drm_helper_encoder_dpms(encoder, encoder_dpms);
933 : }
934 :
935 : /* from on to off, do encoder then crtc */
936 0 : if (mode > old_dpms) {
937 0 : if (encoder)
938 : drm_helper_encoder_dpms(encoder, encoder_dpms);
939 0 : if (crtc) {
940 0 : const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
941 :
942 0 : if (crtc_funcs->dpms)
943 0 : (*crtc_funcs->dpms) (crtc,
944 : drm_helper_choose_crtc_dpms(crtc));
945 : }
946 : }
947 :
948 : return 0;
949 : }
950 : EXPORT_SYMBOL(drm_helper_connector_dpms);
951 :
952 : /**
953 : * drm_helper_resume_force_mode - force-restore mode setting configuration
954 : * @dev: drm_device which should be restored
955 : *
956 : * Drivers which use the mode setting helpers can use this function to
957 : * force-restore the mode setting configuration e.g. on resume or when something
958 : * else might have trampled over the hw state (like some overzealous old BIOSen
959 : * tended to do).
960 : *
961 : * This helper doesn't provide a error return value since restoring the old
962 : * config should never fail due to resource allocation issues since the driver
963 : * has successfully set the restored configuration already. Hence this should
964 : * boil down to the equivalent of a few dpms on calls, which also don't provide
965 : * an error code.
966 : *
967 : * Drivers where simply restoring an old configuration again might fail (e.g.
968 : * due to slight differences in allocating shared resources when the
969 : * configuration is restored in a different order than when userspace set it up)
970 : * need to use their own restore logic.
971 : *
972 : * This function is deprecated. New drivers should implement atomic mode-
973 : * setting and use the atomic suspend/resume helpers.
974 : *
975 : * See also:
976 : * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
977 : */
978 0 : void drm_helper_resume_force_mode(struct drm_device *dev)
979 : {
980 : struct drm_crtc *crtc;
981 : struct drm_encoder *encoder;
982 : const struct drm_crtc_helper_funcs *crtc_funcs;
983 : int encoder_dpms;
984 : bool ret;
985 :
986 0 : WARN_ON(drm_drv_uses_atomic_modeset(dev));
987 :
988 0 : drm_modeset_lock_all(dev);
989 0 : drm_for_each_crtc(crtc, dev) {
990 :
991 0 : if (!crtc->enabled)
992 0 : continue;
993 :
994 0 : ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
995 0 : crtc->x, crtc->y, crtc->primary->fb);
996 :
997 : /* Restoring the old config should never fail! */
998 0 : if (ret == false)
999 0 : DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1000 :
1001 : /* Turn off outputs that were already powered off */
1002 0 : if (drm_helper_choose_crtc_dpms(crtc)) {
1003 0 : drm_for_each_encoder(encoder, dev) {
1004 :
1005 0 : if(encoder->crtc != crtc)
1006 0 : continue;
1007 :
1008 0 : encoder_dpms = drm_helper_choose_encoder_dpms(
1009 : encoder);
1010 :
1011 : drm_helper_encoder_dpms(encoder, encoder_dpms);
1012 : }
1013 :
1014 0 : crtc_funcs = crtc->helper_private;
1015 0 : if (crtc_funcs->dpms)
1016 0 : (*crtc_funcs->dpms) (crtc,
1017 : drm_helper_choose_crtc_dpms(crtc));
1018 : }
1019 : }
1020 :
1021 : /* disable the unused connectors while restoring the modesetting */
1022 0 : __drm_helper_disable_unused_functions(dev);
1023 0 : drm_modeset_unlock_all(dev);
1024 0 : }
1025 : EXPORT_SYMBOL(drm_helper_resume_force_mode);
1026 :
1027 : /**
1028 : * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
1029 : * @dev: DRM device whose CRTCs to turn off
1030 : *
1031 : * Drivers may want to call this on unload to ensure that all displays are
1032 : * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1033 : *
1034 : * Note: This should only be used by non-atomic legacy drivers. For an atomic
1035 : * version look at drm_atomic_helper_shutdown().
1036 : *
1037 : * Returns:
1038 : * Zero on success, error code on failure.
1039 : */
1040 0 : int drm_helper_force_disable_all(struct drm_device *dev)
1041 : {
1042 : struct drm_crtc *crtc;
1043 0 : int ret = 0;
1044 :
1045 0 : drm_modeset_lock_all(dev);
1046 0 : drm_for_each_crtc(crtc, dev)
1047 0 : if (crtc->enabled) {
1048 0 : struct drm_mode_set set = {
1049 : .crtc = crtc,
1050 : };
1051 :
1052 0 : ret = drm_mode_set_config_internal(&set);
1053 0 : if (ret)
1054 : goto out;
1055 : }
1056 : out:
1057 0 : drm_modeset_unlock_all(dev);
1058 0 : return ret;
1059 : }
1060 : EXPORT_SYMBOL(drm_helper_force_disable_all);
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