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