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1/*2 * Copyright (c) 2006-2008 Intel Corporation3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>4 *5 * DRM core CRTC related functions6 *7 * Permission to use, copy, modify, distribute, and sell this software and its8 * documentation for any purpose is hereby granted without fee, provided that9 * the above copyright notice appear in all copies and that both that copyright10 * notice and this permission notice appear in supporting documentation, and11 * that the name of the copyright holders not be used in advertising or12 * publicity pertaining to distribution of the software without specific,13 * written prior permission. The copyright holders make no representations14 * about the suitability of this software for any purpose. It is provided "as15 * 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 NO19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE23 * OF THIS SOFTWARE.24 *25 * Authors:26 * Keith Packard27 * 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 53DECLARE_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: overview67 *68 * The CRTC modeset helper library provides a default set_config implementation69 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using70 * the same callbacks which drivers can use to e.g. restore the modeset71 * configuration on resume with drm_helper_resume_force_mode().72 *73 * Note that this helper library doesn't track the current power state of CRTCs74 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even75 * though the hardware is already in the desired state. This deficiency has been76 * 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 the80 * primary plane is implemented as a real standalone plane and not directly tied81 * to the CRTC state. For easier transition this library provides functions to82 * implement the old semantics required by the CRTC helpers using the new plane83 * and atomic helper callbacks.84 *85 * Drivers are strongly urged to convert to the atomic helpers (by way of first86 * converting to the plane helpers). New drivers must not use these functions87 * but need to implement the atomic interface instead, potentially using the88 * atomic helpers for that.89 *90 * These legacy modeset helpers use the same function table structures as91 * all other modesetting helpers. See the documentation for struct92 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct93 * &drm_connector_helper_funcs.94 */95 96/**97 * drm_helper_encoder_in_use - check if a given encoder is in use98 * @encoder: encoder to check99 *100 * Checks whether @encoder is with the current mode setting output configuration101 * in use by any connector. This doesn't mean that it is actually enabled since102 * the DPMS state is tracked separately.103 *104 * Returns:105 * True if @encoder is used, false otherwise.106 */107bool drm_helper_encoder_in_use(struct drm_encoder *encoder)108{109 struct drm_connector *connector;110 struct drm_connector_list_iter conn_iter;111 struct drm_device *dev = encoder->dev;112 113 drm_WARN_ON(dev, 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 if (!oops_in_progress) {120 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));121 drm_WARN_ON(dev, !drm_modeset_is_locked(&dev->mode_config.connection_mutex));122 }123 124 125 drm_connector_list_iter_begin(dev, &conn_iter);126 drm_for_each_connector_iter(connector, &conn_iter) {127 if (connector->encoder == encoder) {128 drm_connector_list_iter_end(&conn_iter);129 return true;130 }131 }132 drm_connector_list_iter_end(&conn_iter);133 return false;134}135EXPORT_SYMBOL(drm_helper_encoder_in_use);136 137/**138 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config139 * @crtc: CRTC to check140 *141 * Checks whether @crtc is with the current mode setting output configuration142 * in use by any connector. This doesn't mean that it is actually enabled since143 * the DPMS state is tracked separately.144 *145 * Returns:146 * True if @crtc is used, false otherwise.147 */148bool drm_helper_crtc_in_use(struct drm_crtc *crtc)149{150 struct drm_encoder *encoder;151 struct drm_device *dev = crtc->dev;152 153 drm_WARN_ON(dev, 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 if (!oops_in_progress)160 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));161 162 drm_for_each_encoder(encoder, dev)163 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))164 return true;165 return false;166}167EXPORT_SYMBOL(drm_helper_crtc_in_use);168 169static void170drm_encoder_disable(struct drm_encoder *encoder)171{172 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;173 174 if (!encoder_funcs)175 return;176 177 if (encoder_funcs->disable)178 (*encoder_funcs->disable)(encoder);179 else if (encoder_funcs->dpms)180 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);181}182 183static void __drm_helper_disable_unused_functions(struct drm_device *dev)184{185 struct drm_encoder *encoder;186 struct drm_crtc *crtc;187 188 drm_warn_on_modeset_not_all_locked(dev);189 190 drm_for_each_encoder(encoder, dev) {191 if (!drm_helper_encoder_in_use(encoder)) {192 drm_encoder_disable(encoder);193 /* disconnect encoder from any connector */194 encoder->crtc = NULL;195 }196 }197 198 drm_for_each_crtc(crtc, dev) {199 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;200 201 crtc->enabled = drm_helper_crtc_in_use(crtc);202 if (!crtc->enabled) {203 if (crtc_funcs->disable)204 (*crtc_funcs->disable)(crtc);205 else206 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);207 crtc->primary->fb = NULL;208 }209 }210}211 212/**213 * drm_helper_disable_unused_functions - disable unused objects214 * @dev: DRM device215 *216 * This function walks through the entire mode setting configuration of @dev. It217 * will remove any CRTC links of unused encoders and encoder links of218 * disconnected connectors. Then it will disable all unused encoders and CRTCs219 * either by calling their disable callback if available or by calling their220 * dpms callback with DRM_MODE_DPMS_OFF.221 *222 * NOTE:223 *224 * This function is part of the legacy modeset helper library and will cause225 * major confusion with atomic drivers. This is because atomic helpers guarantee226 * to never call ->disable() hooks on a disabled function, or ->enable() hooks227 * on an enabled functions. drm_helper_disable_unused_functions() on the other228 * hand throws such guarantees into the wind and calls disable hooks229 * unconditionally on unused functions.230 */231void drm_helper_disable_unused_functions(struct drm_device *dev)232{233 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));234 235 drm_modeset_lock_all(dev);236 __drm_helper_disable_unused_functions(dev);237 drm_modeset_unlock_all(dev);238}239EXPORT_SYMBOL(drm_helper_disable_unused_functions);240 241/*242 * Check the CRTC we're going to map each output to vs. its current243 * CRTC. If they don't match, we have to disable the output and the CRTC244 * since the driver will have to re-route things.245 */246static void247drm_crtc_prepare_encoders(struct drm_device *dev)248{249 const struct drm_encoder_helper_funcs *encoder_funcs;250 struct drm_encoder *encoder;251 252 drm_for_each_encoder(encoder, dev) {253 encoder_funcs = encoder->helper_private;254 if (!encoder_funcs)255 continue;256 257 /* Disable unused encoders */258 if (encoder->crtc == NULL)259 drm_encoder_disable(encoder);260 }261}262 263/**264 * drm_crtc_helper_set_mode - internal helper to set a mode265 * @crtc: CRTC to program266 * @mode: mode to use267 * @x: horizontal offset into the surface268 * @y: vertical offset into the surface269 * @old_fb: old framebuffer, for cleanup270 *271 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance272 * to fixup or reject the mode prior to trying to set it. This is an internal273 * helper that drivers could e.g. use to update properties that require the274 * entire output pipe to be disabled and re-enabled in a new configuration. For275 * example for changing whether audio is enabled on a hdmi link or for changing276 * panel fitter or dither attributes. It is also called by the277 * drm_crtc_helper_set_config() helper function to drive the mode setting278 * sequence.279 *280 * Returns:281 * True if the mode was set successfully, false otherwise.282 */283bool 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 struct drm_device *dev = crtc->dev;289 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;290 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 bool ret = true;296 297 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));298 299 drm_warn_on_modeset_not_all_locked(dev);300 301 saved_enabled = crtc->enabled;302 crtc->enabled = drm_helper_crtc_in_use(crtc);303 if (!crtc->enabled)304 return true;305 306 adjusted_mode = drm_mode_duplicate(dev, mode);307 if (!adjusted_mode) {308 crtc->enabled = saved_enabled;309 return false;310 }311 312 drm_mode_init(&saved_mode, &crtc->mode);313 drm_mode_init(&saved_hwmode, &crtc->hwmode);314 saved_x = crtc->x;315 saved_y = crtc->y;316 317 /* Update crtc values up front so the driver can rely on them for mode318 * setting.319 */320 drm_mode_copy(&crtc->mode, mode);321 crtc->x = x;322 crtc->y = y;323 324 /* Pass our mode to the connectors and the CRTC to give them a chance to325 * adjust it according to limitations or connector properties, and also326 * a chance to reject the mode entirely.327 */328 drm_for_each_encoder(encoder, dev) {329 330 if (encoder->crtc != crtc)331 continue;332 333 encoder_funcs = encoder->helper_private;334 if (!encoder_funcs)335 continue;336 337 encoder_funcs = encoder->helper_private;338 if (encoder_funcs->mode_fixup) {339 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,340 adjusted_mode))) {341 drm_dbg_kms(dev, "[ENCODER:%d:%s] mode fixup failed\n",342 encoder->base.id, encoder->name);343 goto done;344 }345 }346 }347 348 if (crtc_funcs->mode_fixup) {349 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,350 adjusted_mode))) {351 drm_dbg_kms(dev, "[CRTC:%d:%s] mode fixup failed\n",352 crtc->base.id, crtc->name);353 goto done;354 }355 }356 drm_dbg_kms(dev, "[CRTC:%d:%s]\n", crtc->base.id, crtc->name);357 358 drm_mode_copy(&crtc->hwmode, adjusted_mode);359 360 /* Prepare the encoders and CRTCs before setting the mode. */361 drm_for_each_encoder(encoder, dev) {362 363 if (encoder->crtc != crtc)364 continue;365 366 encoder_funcs = encoder->helper_private;367 if (!encoder_funcs)368 continue;369 370 /* Disable the encoders as the first thing we do. */371 if (encoder_funcs->prepare)372 encoder_funcs->prepare(encoder);373 }374 375 drm_crtc_prepare_encoders(dev);376 377 crtc_funcs->prepare(crtc);378 379 /* Set up the DPLL and any encoders state that needs to adjust or depend380 * on the DPLL.381 */382 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);383 if (!ret)384 goto done;385 386 drm_for_each_encoder(encoder, dev) {387 388 if (encoder->crtc != crtc)389 continue;390 391 encoder_funcs = encoder->helper_private;392 if (!encoder_funcs)393 continue;394 395 drm_dbg_kms(dev, "[ENCODER:%d:%s] set [MODE:%s]\n",396 encoder->base.id, encoder->name, mode->name);397 if (encoder_funcs->mode_set)398 encoder_funcs->mode_set(encoder, mode, adjusted_mode);399 }400 401 /* Now enable the clocks, plane, pipe, and connectors that we set up. */402 crtc_funcs->commit(crtc);403 404 drm_for_each_encoder(encoder, dev) {405 406 if (encoder->crtc != crtc)407 continue;408 409 encoder_funcs = encoder->helper_private;410 if (!encoder_funcs)411 continue;412 413 if (encoder_funcs->commit)414 encoder_funcs->commit(encoder);415 }416 417 /* Calculate and store various constants which418 * are later needed by vblank and swap-completion419 * timestamping. They are derived from true hwmode.420 */421 drm_calc_timestamping_constants(crtc, &crtc->hwmode);422 423 /* FIXME: add subpixel order */424done:425 drm_mode_destroy(dev, adjusted_mode);426 if (!ret) {427 crtc->enabled = saved_enabled;428 drm_mode_copy(&crtc->mode, &saved_mode);429 drm_mode_copy(&crtc->hwmode, &saved_hwmode);430 crtc->x = saved_x;431 crtc->y = saved_y;432 }433 434 return ret;435}436EXPORT_SYMBOL(drm_crtc_helper_set_mode);437 438/**439 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state440 * @crtc: CRTC to check441 * @state: atomic state object442 *443 * Provides a default CRTC-state check handler for CRTCs that only have444 * one primary plane attached to it. This is often the case for the CRTC445 * of simple framebuffers.446 *447 * RETURNS:448 * Zero on success, or an errno code otherwise.449 */450int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)451{452 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);453 454 if (!new_crtc_state->enable)455 return 0;456 457 return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);458}459EXPORT_SYMBOL(drm_crtc_helper_atomic_check);460 461static void462drm_crtc_helper_disable(struct drm_crtc *crtc)463{464 struct drm_device *dev = crtc->dev;465 struct drm_connector *connector;466 struct drm_encoder *encoder;467 468 /* Decouple all encoders and their attached connectors from this crtc */469 drm_for_each_encoder(encoder, dev) {470 struct drm_connector_list_iter conn_iter;471 472 if (encoder->crtc != crtc)473 continue;474 475 drm_connector_list_iter_begin(dev, &conn_iter);476 drm_for_each_connector_iter(connector, &conn_iter) {477 if (connector->encoder != encoder)478 continue;479 480 connector->encoder = NULL;481 482 /*483 * drm_helper_disable_unused_functions() ought to be484 * doing this, but since we've decoupled the encoder485 * from the connector above, the required connection486 * between them is henceforth no longer available.487 */488 connector->dpms = DRM_MODE_DPMS_OFF;489 490 /* we keep a reference while the encoder is bound */491 drm_connector_put(connector);492 }493 drm_connector_list_iter_end(&conn_iter);494 }495 496 __drm_helper_disable_unused_functions(dev);497}498 499/*500 * For connectors that support multiple encoders, either the501 * .atomic_best_encoder() or .best_encoder() operation must be implemented.502 */503struct drm_encoder *504drm_connector_get_single_encoder(struct drm_connector *connector)505{506 struct drm_encoder *encoder;507 508 drm_WARN_ON(connector->dev, hweight32(connector->possible_encoders) > 1);509 drm_connector_for_each_possible_encoder(connector, encoder)510 return encoder;511 512 return NULL;513}514 515/**516 * drm_crtc_helper_set_config - set a new config from userspace517 * @set: mode set configuration518 * @ctx: lock acquire context, not used here519 *520 * The drm_crtc_helper_set_config() helper function implements the of521 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC522 * helpers.523 *524 * It first tries to locate the best encoder for each connector by calling the525 * connector @drm_connector_helper_funcs.best_encoder helper operation.526 *527 * After locating the appropriate encoders, the helper function will call the528 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,529 * or reject it completely in which case an error will be returned to the530 * application. If the new configuration after mode adjustment is identical to531 * the current configuration the helper function will return without performing532 * any other operation.533 *534 * If the adjusted mode is identical to the current mode but changes to the535 * frame buffer need to be applied, the drm_crtc_helper_set_config() function536 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.537 *538 * If the adjusted mode differs from the current mode, or if the539 * ->mode_set_base() helper operation is not provided, the helper function540 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()541 * and ->commit() CRTC and encoder helper operations, in that order.542 * Alternatively it can also use the dpms and disable helper operations. For543 * details see &struct drm_crtc_helper_funcs and struct544 * &drm_encoder_helper_funcs.545 *546 * This function is deprecated. New drivers must implement atomic modeset547 * support, for which this function is unsuitable. Instead drivers should use548 * drm_atomic_helper_set_config().549 *550 * Returns:551 * Returns 0 on success, negative errno numbers on failure.552 */553int drm_crtc_helper_set_config(struct drm_mode_set *set,554 struct drm_modeset_acquire_ctx *ctx)555{556 struct drm_device *dev;557 struct drm_crtc **save_encoder_crtcs, *new_crtc;558 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;559 bool mode_changed = false; /* if true do a full mode set */560 bool fb_changed = false; /* if true and !mode_changed just do a flip */561 struct drm_connector *connector;562 struct drm_connector_list_iter conn_iter;563 int count = 0, ro, fail = 0;564 const struct drm_crtc_helper_funcs *crtc_funcs;565 struct drm_mode_set save_set;566 int ret;567 int i;568 569 BUG_ON(!set);570 BUG_ON(!set->crtc);571 BUG_ON(!set->crtc->helper_private);572 573 /* Enforce sane interface api - has been abused by the fb helper. */574 BUG_ON(!set->mode && set->fb);575 BUG_ON(set->fb && set->num_connectors == 0);576 577 crtc_funcs = set->crtc->helper_private;578 579 dev = set->crtc->dev;580 581 drm_dbg_kms(dev, "\n");582 583 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));584 585 if (!set->mode)586 set->fb = NULL;587 588 if (set->fb) {589 drm_dbg_kms(dev, "[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 drm_dbg_kms(dev, "[CRTC:%d:%s] [NOFB]\n",595 set->crtc->base.id, set->crtc->name);596 drm_crtc_helper_disable(set->crtc);597 return 0;598 }599 600 drm_warn_on_modeset_not_all_locked(dev);601 602 /*603 * Allocate space for the backup of all (non-pointer) encoder and604 * connector data.605 */606 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,607 sizeof(struct drm_crtc *), GFP_KERNEL);608 if (!save_encoder_crtcs)609 return -ENOMEM;610 611 save_connector_encoders = kcalloc(dev->mode_config.num_connector,612 sizeof(struct drm_encoder *), GFP_KERNEL);613 if (!save_connector_encoders) {614 kfree(save_encoder_crtcs);615 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 is621 * restored, not the drivers personal bookkeeping.622 */623 count = 0;624 drm_for_each_encoder(encoder, dev) {625 save_encoder_crtcs[count++] = encoder->crtc;626 }627 628 count = 0;629 drm_connector_list_iter_begin(dev, &conn_iter);630 drm_for_each_connector_iter(connector, &conn_iter)631 save_connector_encoders[count++] = connector->encoder;632 drm_connector_list_iter_end(&conn_iter);633 634 save_set.crtc = set->crtc;635 save_set.mode = &set->crtc->mode;636 save_set.x = set->crtc->x;637 save_set.y = set->crtc->y;638 save_set.fb = set->crtc->primary->fb;639 640 /* We should be able to check here if the fb has the same properties641 * and then just flip_or_move it */642 if (set->crtc->primary->fb != set->fb) {643 /* If we have no fb then treat it as a full mode set */644 if (set->crtc->primary->fb == NULL) {645 drm_dbg_kms(dev, "[CRTC:%d:%s] no fb, full mode set\n",646 set->crtc->base.id, set->crtc->name);647 mode_changed = true;648 } else if (set->fb->format != set->crtc->primary->fb->format) {649 mode_changed = true;650 } else651 fb_changed = true;652 }653 654 if (set->x != set->crtc->x || set->y != set->crtc->y)655 fb_changed = true;656 657 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {658 drm_dbg_kms(dev, "[CRTC:%d:%s] modes are different, full mode set:\n",659 set->crtc->base.id, set->crtc->name);660 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(&set->crtc->mode));661 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(set->mode));662 mode_changed = true;663 }664 665 /* take a reference on all unbound connectors in set, reuse the666 * already taken reference for bound connectors667 */668 for (ro = 0; ro < set->num_connectors; ro++) {669 if (set->connectors[ro]->encoder)670 continue;671 drm_connector_get(set->connectors[ro]);672 }673 674 /* a) traverse passed in connector list and get encoders for them */675 count = 0;676 drm_connector_list_iter_begin(dev, &conn_iter);677 drm_for_each_connector_iter(connector, &conn_iter) {678 const struct drm_connector_helper_funcs *connector_funcs =679 connector->helper_private;680 new_encoder = connector->encoder;681 for (ro = 0; ro < set->num_connectors; ro++) {682 if (set->connectors[ro] == connector) {683 if (connector_funcs->best_encoder)684 new_encoder = connector_funcs->best_encoder(connector);685 else686 new_encoder = drm_connector_get_single_encoder(connector);687 688 /* if we can't get an encoder for a connector689 we are setting now - then fail */690 if (new_encoder == NULL)691 /* don't break so fail path works correct */692 fail = 1;693 694 if (connector->dpms != DRM_MODE_DPMS_ON) {695 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] DPMS not on, full mode switch\n",696 connector->base.id, connector->name);697 mode_changed = true;698 }699 700 break;701 }702 }703 704 if (new_encoder != connector->encoder) {705 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] encoder changed, full mode switch\n",706 connector->base.id, connector->name);707 mode_changed = true;708 /* If the encoder is reused for another connector, then709 * the appropriate crtc will be set later.710 */711 if (connector->encoder)712 connector->encoder->crtc = NULL;713 connector->encoder = new_encoder;714 }715 }716 drm_connector_list_iter_end(&conn_iter);717 718 if (fail) {719 ret = -EINVAL;720 goto fail;721 }722 723 count = 0;724 drm_connector_list_iter_begin(dev, &conn_iter);725 drm_for_each_connector_iter(connector, &conn_iter) {726 if (!connector->encoder)727 continue;728 729 if (connector->encoder->crtc == set->crtc)730 new_crtc = NULL;731 else732 new_crtc = connector->encoder->crtc;733 734 for (ro = 0; ro < set->num_connectors; ro++) {735 if (set->connectors[ro] == connector)736 new_crtc = set->crtc;737 }738 739 /* Make sure the new CRTC will work with the encoder */740 if (new_crtc &&741 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {742 ret = -EINVAL;743 drm_connector_list_iter_end(&conn_iter);744 goto fail;745 }746 if (new_crtc != connector->encoder->crtc) {747 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] CRTC changed, full mode switch\n",748 connector->base.id, connector->name);749 mode_changed = true;750 connector->encoder->crtc = new_crtc;751 }752 if (new_crtc) {753 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",754 connector->base.id, connector->name,755 new_crtc->base.id, new_crtc->name);756 } else {757 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [NOCRTC]\n",758 connector->base.id, connector->name);759 }760 }761 drm_connector_list_iter_end(&conn_iter);762 763 /* mode_set_base is not a required function */764 if (fb_changed && !crtc_funcs->mode_set_base)765 mode_changed = true;766 767 if (mode_changed) {768 if (drm_helper_crtc_in_use(set->crtc)) {769 drm_dbg_kms(dev, "[CRTC:%d:%s] attempting to set mode from userspace: " DRM_MODE_FMT "\n",770 set->crtc->base.id, set->crtc->name, DRM_MODE_ARG(set->mode));771 set->crtc->primary->fb = set->fb;772 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,773 set->x, set->y,774 save_set.fb)) {775 drm_err(dev, "[CRTC:%d:%s] failed to set mode\n",776 set->crtc->base.id, set->crtc->name);777 set->crtc->primary->fb = save_set.fb;778 ret = -EINVAL;779 goto fail;780 }781 drm_dbg_kms(dev, "[CRTC:%d:%s] Setting connector DPMS state to on\n",782 set->crtc->base.id, set->crtc->name);783 for (i = 0; i < set->num_connectors; i++) {784 drm_dbg_kms(dev, "\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,785 set->connectors[i]->name);786 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);787 }788 }789 __drm_helper_disable_unused_functions(dev);790 } else if (fb_changed) {791 set->crtc->x = set->x;792 set->crtc->y = set->y;793 set->crtc->primary->fb = set->fb;794 ret = crtc_funcs->mode_set_base(set->crtc,795 set->x, set->y, save_set.fb);796 if (ret != 0) {797 set->crtc->x = save_set.x;798 set->crtc->y = save_set.y;799 set->crtc->primary->fb = save_set.fb;800 goto fail;801 }802 }803 804 kfree(save_connector_encoders);805 kfree(save_encoder_crtcs);806 return 0;807 808fail:809 /* Restore all previous data. */810 count = 0;811 drm_for_each_encoder(encoder, dev) {812 encoder->crtc = save_encoder_crtcs[count++];813 }814 815 count = 0;816 drm_connector_list_iter_begin(dev, &conn_iter);817 drm_for_each_connector_iter(connector, &conn_iter)818 connector->encoder = save_connector_encoders[count++];819 drm_connector_list_iter_end(&conn_iter);820 821 /* after fail drop reference on all unbound connectors in set, let822 * bound connectors keep their reference823 */824 for (ro = 0; ro < set->num_connectors; ro++) {825 if (set->connectors[ro]->encoder)826 continue;827 drm_connector_put(set->connectors[ro]);828 }829 830 /* Try to restore the config */831 if (mode_changed &&832 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,833 save_set.y, save_set.fb))834 drm_err(dev, "failed to restore config after modeset failure\n");835 836 kfree(save_connector_encoders);837 kfree(save_encoder_crtcs);838 return ret;839}840EXPORT_SYMBOL(drm_crtc_helper_set_config);841 842static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)843{844 int dpms = DRM_MODE_DPMS_OFF;845 struct drm_connector *connector;846 struct drm_connector_list_iter conn_iter;847 struct drm_device *dev = encoder->dev;848 849 drm_connector_list_iter_begin(dev, &conn_iter);850 drm_for_each_connector_iter(connector, &conn_iter)851 if (connector->encoder == encoder)852 if (connector->dpms < dpms)853 dpms = connector->dpms;854 drm_connector_list_iter_end(&conn_iter);855 856 return dpms;857}858 859/* Helper which handles bridge ordering around encoder dpms */860static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)861{862 const struct drm_encoder_helper_funcs *encoder_funcs;863 864 encoder_funcs = encoder->helper_private;865 if (!encoder_funcs)866 return;867 868 if (encoder_funcs->dpms)869 encoder_funcs->dpms(encoder, mode);870}871 872static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)873{874 int dpms = DRM_MODE_DPMS_OFF;875 struct drm_connector *connector;876 struct drm_connector_list_iter conn_iter;877 struct drm_device *dev = crtc->dev;878 879 drm_connector_list_iter_begin(dev, &conn_iter);880 drm_for_each_connector_iter(connector, &conn_iter)881 if (connector->encoder && connector->encoder->crtc == crtc)882 if (connector->dpms < dpms)883 dpms = connector->dpms;884 drm_connector_list_iter_end(&conn_iter);885 886 return dpms;887}888 889/**890 * drm_helper_connector_dpms() - connector dpms helper implementation891 * @connector: affected connector892 * @mode: DPMS mode893 *894 * The drm_helper_connector_dpms() helper function implements the895 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC896 * helpers.897 *898 * This is the main helper function provided by the CRTC helper framework for899 * implementing the DPMS connector attribute. It computes the new desired DPMS900 * state for all encoders and CRTCs in the output mesh and calls the901 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks902 * provided by the driver.903 *904 * This function is deprecated. New drivers must implement atomic modeset905 * support, where DPMS is handled in the DRM core.906 *907 * Returns:908 * Always returns 0.909 */910int drm_helper_connector_dpms(struct drm_connector *connector, int mode)911{912 struct drm_encoder *encoder = connector->encoder;913 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;914 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;915 916 drm_WARN_ON(connector->dev, drm_drv_uses_atomic_modeset(connector->dev));917 918 if (mode == connector->dpms)919 return 0;920 921 old_dpms = connector->dpms;922 connector->dpms = mode;923 924 if (encoder)925 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);926 927 /* from off to on, do crtc then encoder */928 if (mode < old_dpms) {929 if (crtc) {930 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;931 932 if (crtc_funcs->dpms)933 (*crtc_funcs->dpms) (crtc,934 drm_helper_choose_crtc_dpms(crtc));935 }936 if (encoder)937 drm_helper_encoder_dpms(encoder, encoder_dpms);938 }939 940 /* from on to off, do encoder then crtc */941 if (mode > old_dpms) {942 if (encoder)943 drm_helper_encoder_dpms(encoder, encoder_dpms);944 if (crtc) {945 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;946 947 if (crtc_funcs->dpms)948 (*crtc_funcs->dpms) (crtc,949 drm_helper_choose_crtc_dpms(crtc));950 }951 }952 953 return 0;954}955EXPORT_SYMBOL(drm_helper_connector_dpms);956 957/**958 * drm_helper_resume_force_mode - force-restore mode setting configuration959 * @dev: drm_device which should be restored960 *961 * Drivers which use the mode setting helpers can use this function to962 * force-restore the mode setting configuration e.g. on resume or when something963 * else might have trampled over the hw state (like some overzealous old BIOSen964 * tended to do).965 *966 * This helper doesn't provide a error return value since restoring the old967 * config should never fail due to resource allocation issues since the driver968 * has successfully set the restored configuration already. Hence this should969 * boil down to the equivalent of a few dpms on calls, which also don't provide970 * an error code.971 *972 * Drivers where simply restoring an old configuration again might fail (e.g.973 * due to slight differences in allocating shared resources when the974 * configuration is restored in a different order than when userspace set it up)975 * need to use their own restore logic.976 *977 * This function is deprecated. New drivers should implement atomic mode-978 * setting and use the atomic suspend/resume helpers.979 *980 * See also:981 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()982 */983void drm_helper_resume_force_mode(struct drm_device *dev)984{985 struct drm_crtc *crtc;986 struct drm_encoder *encoder;987 const struct drm_crtc_helper_funcs *crtc_funcs;988 int encoder_dpms;989 bool ret;990 991 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));992 993 drm_modeset_lock_all(dev);994 drm_for_each_crtc(crtc, dev) {995 996 if (!crtc->enabled)997 continue;998 999 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,1000 crtc->x, crtc->y, crtc->primary->fb);1001 1002 /* Restoring the old config should never fail! */1003 if (ret == false)1004 drm_err(dev, "failed to set mode on crtc %p\n", crtc);1005 1006 /* Turn off outputs that were already powered off */1007 if (drm_helper_choose_crtc_dpms(crtc)) {1008 drm_for_each_encoder(encoder, dev) {1009 1010 if(encoder->crtc != crtc)1011 continue;1012 1013 encoder_dpms = drm_helper_choose_encoder_dpms(1014 encoder);1015 1016 drm_helper_encoder_dpms(encoder, encoder_dpms);1017 }1018 1019 crtc_funcs = crtc->helper_private;1020 if (crtc_funcs->dpms)1021 (*crtc_funcs->dpms) (crtc,1022 drm_helper_choose_crtc_dpms(crtc));1023 }1024 }1025 1026 /* disable the unused connectors while restoring the modesetting */1027 __drm_helper_disable_unused_functions(dev);1028 drm_modeset_unlock_all(dev);1029}1030EXPORT_SYMBOL(drm_helper_resume_force_mode);1031 1032/**1033 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs1034 * @dev: DRM device whose CRTCs to turn off1035 *1036 * Drivers may want to call this on unload to ensure that all displays are1037 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.1038 *1039 * Note: This should only be used by non-atomic legacy drivers. For an atomic1040 * version look at drm_atomic_helper_shutdown().1041 *1042 * Returns:1043 * Zero on success, error code on failure.1044 */1045int drm_helper_force_disable_all(struct drm_device *dev)1046{1047 struct drm_crtc *crtc;1048 int ret = 0;1049 1050 drm_modeset_lock_all(dev);1051 drm_for_each_crtc(crtc, dev)1052 if (crtc->enabled) {1053 struct drm_mode_set set = {1054 .crtc = crtc,1055 };1056 1057 ret = drm_mode_set_config_internal(&set);1058 if (ret)1059 goto out;1060 }1061out:1062 drm_modeset_unlock_all(dev);1063 return ret;1064}1065EXPORT_SYMBOL(drm_helper_force_disable_all);1066