Root/drivers/gpu/drm/drm_crtc_helper.c

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/moduleparam.h>
34
35#include "drmP.h"
36#include "drm_crtc.h"
37#include "drm_fourcc.h"
38#include "drm_crtc_helper.h"
39#include "drm_fb_helper.h"
40#include "drm_edid.h"
41
42static bool drm_kms_helper_poll = true;
43module_param_named(poll, drm_kms_helper_poll, bool, 0600);
44
45static void drm_mode_validate_flag(struct drm_connector *connector,
46                   int flags)
47{
48    struct drm_display_mode *mode;
49
50    if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
51        return;
52
53    list_for_each_entry(mode, &connector->modes, head) {
54        if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
55                !(flags & DRM_MODE_FLAG_INTERLACE))
56            mode->status = MODE_NO_INTERLACE;
57        if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
58                !(flags & DRM_MODE_FLAG_DBLSCAN))
59            mode->status = MODE_NO_DBLESCAN;
60    }
61
62    return;
63}
64
65/**
66 * drm_helper_probe_single_connector_modes - get complete set of display modes
67 * @dev: DRM device
68 * @maxX: max width for modes
69 * @maxY: max height for modes
70 *
71 * LOCKING:
72 * Caller must hold mode config lock.
73 *
74 * Based on @dev's mode_config layout, scan all the connectors and try to detect
75 * modes on them. Modes will first be added to the connector's probed_modes
76 * list, then culled (based on validity and the @maxX, @maxY parameters) and
77 * put into the normal modes list.
78 *
79 * Intended to be used either at bootup time or when major configuration
80 * changes have occurred.
81 *
82 * FIXME: take into account monitor limits
83 *
84 * RETURNS:
85 * Number of modes found on @connector.
86 */
87int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
88                        uint32_t maxX, uint32_t maxY)
89{
90    struct drm_device *dev = connector->dev;
91    struct drm_display_mode *mode;
92    struct drm_connector_helper_funcs *connector_funcs =
93        connector->helper_private;
94    int count = 0;
95    int mode_flags = 0;
96
97    DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
98            drm_get_connector_name(connector));
99    /* set all modes to the unverified state */
100    list_for_each_entry(mode, &connector->modes, head)
101        mode->status = MODE_UNVERIFIED;
102
103    if (connector->force) {
104        if (connector->force == DRM_FORCE_ON)
105            connector->status = connector_status_connected;
106        else
107            connector->status = connector_status_disconnected;
108        if (connector->funcs->force)
109            connector->funcs->force(connector);
110    } else {
111        connector->status = connector->funcs->detect(connector, true);
112        drm_kms_helper_poll_enable(dev);
113    }
114
115    if (connector->status == connector_status_disconnected) {
116        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
117            connector->base.id, drm_get_connector_name(connector));
118        drm_mode_connector_update_edid_property(connector, NULL);
119        goto prune;
120    }
121
122#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
123    count = drm_load_edid_firmware(connector);
124    if (count == 0)
125#endif
126        count = (*connector_funcs->get_modes)(connector);
127
128    if (count == 0 && connector->status == connector_status_connected)
129        count = drm_add_modes_noedid(connector, 1024, 768);
130    if (count == 0)
131        goto prune;
132
133    drm_mode_connector_list_update(connector);
134
135    if (maxX && maxY)
136        drm_mode_validate_size(dev, &connector->modes, maxX,
137                       maxY, 0);
138
139    if (connector->interlace_allowed)
140        mode_flags |= DRM_MODE_FLAG_INTERLACE;
141    if (connector->doublescan_allowed)
142        mode_flags |= DRM_MODE_FLAG_DBLSCAN;
143    drm_mode_validate_flag(connector, mode_flags);
144
145    list_for_each_entry(mode, &connector->modes, head) {
146        if (mode->status == MODE_OK)
147            mode->status = connector_funcs->mode_valid(connector,
148                                   mode);
149    }
150
151prune:
152    drm_mode_prune_invalid(dev, &connector->modes, true);
153
154    if (list_empty(&connector->modes))
155        return 0;
156
157    drm_mode_sort(&connector->modes);
158
159    DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
160            drm_get_connector_name(connector));
161    list_for_each_entry(mode, &connector->modes, head) {
162        mode->vrefresh = drm_mode_vrefresh(mode);
163
164        drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
165        drm_mode_debug_printmodeline(mode);
166    }
167
168    return count;
169}
170EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
171
172/**
173 * drm_helper_encoder_in_use - check if a given encoder is in use
174 * @encoder: encoder to check
175 *
176 * LOCKING:
177 * Caller must hold mode config lock.
178 *
179 * Walk @encoders's DRM device's mode_config and see if it's in use.
180 *
181 * RETURNS:
182 * True if @encoder is part of the mode_config, false otherwise.
183 */
184bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
185{
186    struct drm_connector *connector;
187    struct drm_device *dev = encoder->dev;
188    list_for_each_entry(connector, &dev->mode_config.connector_list, head)
189        if (connector->encoder == encoder)
190            return true;
191    return false;
192}
193EXPORT_SYMBOL(drm_helper_encoder_in_use);
194
195/**
196 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
197 * @crtc: CRTC to check
198 *
199 * LOCKING:
200 * Caller must hold mode config lock.
201 *
202 * Walk @crtc's DRM device's mode_config and see if it's in use.
203 *
204 * RETURNS:
205 * True if @crtc is part of the mode_config, false otherwise.
206 */
207bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
208{
209    struct drm_encoder *encoder;
210    struct drm_device *dev = crtc->dev;
211    /* FIXME: Locking around list access? */
212    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
213        if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
214            return true;
215    return false;
216}
217EXPORT_SYMBOL(drm_helper_crtc_in_use);
218
219static void
220drm_encoder_disable(struct drm_encoder *encoder)
221{
222    struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
223
224    if (encoder_funcs->disable)
225        (*encoder_funcs->disable)(encoder);
226    else
227        (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
228}
229
230/**
231 * drm_helper_disable_unused_functions - disable unused objects
232 * @dev: DRM device
233 *
234 * LOCKING:
235 * Caller must hold mode config lock.
236 *
237 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
238 * by calling its dpms function, which should power it off.
239 */
240void drm_helper_disable_unused_functions(struct drm_device *dev)
241{
242    struct drm_encoder *encoder;
243    struct drm_connector *connector;
244    struct drm_crtc *crtc;
245
246    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
247        if (!connector->encoder)
248            continue;
249        if (connector->status == connector_status_disconnected)
250            connector->encoder = NULL;
251    }
252
253    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
254        if (!drm_helper_encoder_in_use(encoder)) {
255            drm_encoder_disable(encoder);
256            /* disconnector encoder from any connector */
257            encoder->crtc = NULL;
258        }
259    }
260
261    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
262        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
263        crtc->enabled = drm_helper_crtc_in_use(crtc);
264        if (!crtc->enabled) {
265            if (crtc_funcs->disable)
266                (*crtc_funcs->disable)(crtc);
267            else
268                (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
269            crtc->fb = NULL;
270        }
271    }
272}
273EXPORT_SYMBOL(drm_helper_disable_unused_functions);
274
275/**
276 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
277 * @encoder: encoder to test
278 * @crtc: crtc to test
279 *
280 * Return false if @encoder can't be driven by @crtc, true otherwise.
281 */
282static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
283                struct drm_crtc *crtc)
284{
285    struct drm_device *dev;
286    struct drm_crtc *tmp;
287    int crtc_mask = 1;
288
289    WARN(!crtc, "checking null crtc?\n");
290
291    dev = crtc->dev;
292
293    list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
294        if (tmp == crtc)
295            break;
296        crtc_mask <<= 1;
297    }
298
299    if (encoder->possible_crtcs & crtc_mask)
300        return true;
301    return false;
302}
303
304/*
305 * Check the CRTC we're going to map each output to vs. its current
306 * CRTC. If they don't match, we have to disable the output and the CRTC
307 * since the driver will have to re-route things.
308 */
309static void
310drm_crtc_prepare_encoders(struct drm_device *dev)
311{
312    struct drm_encoder_helper_funcs *encoder_funcs;
313    struct drm_encoder *encoder;
314
315    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
316        encoder_funcs = encoder->helper_private;
317        /* Disable unused encoders */
318        if (encoder->crtc == NULL)
319            drm_encoder_disable(encoder);
320        /* Disable encoders whose CRTC is about to change */
321        if (encoder_funcs->get_crtc &&
322            encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
323            drm_encoder_disable(encoder);
324    }
325}
326
327/**
328 * drm_crtc_set_mode - set a mode
329 * @crtc: CRTC to program
330 * @mode: mode to use
331 * @x: width of mode
332 * @y: height of mode
333 *
334 * LOCKING:
335 * Caller must hold mode config lock.
336 *
337 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
338 * to fixup or reject the mode prior to trying to set it.
339 *
340 * RETURNS:
341 * True if the mode was set successfully, or false otherwise.
342 */
343bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
344                  struct drm_display_mode *mode,
345                  int x, int y,
346                  struct drm_framebuffer *old_fb)
347{
348    struct drm_device *dev = crtc->dev;
349    struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
350    struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
351    struct drm_encoder_helper_funcs *encoder_funcs;
352    int saved_x, saved_y;
353    struct drm_encoder *encoder;
354    bool ret = true;
355
356    crtc->enabled = drm_helper_crtc_in_use(crtc);
357    if (!crtc->enabled)
358        return true;
359
360    adjusted_mode = drm_mode_duplicate(dev, mode);
361    if (!adjusted_mode)
362        return false;
363
364    saved_hwmode = crtc->hwmode;
365    saved_mode = crtc->mode;
366    saved_x = crtc->x;
367    saved_y = crtc->y;
368
369    /* Update crtc values up front so the driver can rely on them for mode
370     * setting.
371     */
372    crtc->mode = *mode;
373    crtc->x = x;
374    crtc->y = y;
375
376    /* Pass our mode to the connectors and the CRTC to give them a chance to
377     * adjust it according to limitations or connector properties, and also
378     * a chance to reject the mode entirely.
379     */
380    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
381
382        if (encoder->crtc != crtc)
383            continue;
384        encoder_funcs = encoder->helper_private;
385        if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
386                              adjusted_mode))) {
387            DRM_DEBUG_KMS("Encoder fixup failed\n");
388            goto done;
389        }
390    }
391
392    if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
393        DRM_DEBUG_KMS("CRTC fixup failed\n");
394        goto done;
395    }
396    DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
397
398    /* Prepare the encoders and CRTCs before setting the mode. */
399    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
400
401        if (encoder->crtc != crtc)
402            continue;
403        encoder_funcs = encoder->helper_private;
404        /* Disable the encoders as the first thing we do. */
405        encoder_funcs->prepare(encoder);
406    }
407
408    drm_crtc_prepare_encoders(dev);
409
410    crtc_funcs->prepare(crtc);
411
412    /* Set up the DPLL and any encoders state that needs to adjust or depend
413     * on the DPLL.
414     */
415    ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
416    if (!ret)
417        goto done;
418
419    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
420
421        if (encoder->crtc != crtc)
422            continue;
423
424        DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
425            encoder->base.id, drm_get_encoder_name(encoder),
426            mode->base.id, mode->name);
427        encoder_funcs = encoder->helper_private;
428        encoder_funcs->mode_set(encoder, mode, adjusted_mode);
429    }
430
431    /* Now enable the clocks, plane, pipe, and connectors that we set up. */
432    crtc_funcs->commit(crtc);
433
434    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
435
436        if (encoder->crtc != crtc)
437            continue;
438
439        encoder_funcs = encoder->helper_private;
440        encoder_funcs->commit(encoder);
441
442    }
443
444    /* Store real post-adjustment hardware mode. */
445    crtc->hwmode = *adjusted_mode;
446
447    /* Calculate and store various constants which
448     * are later needed by vblank and swap-completion
449     * timestamping. They are derived from true hwmode.
450     */
451    drm_calc_timestamping_constants(crtc);
452
453    /* FIXME: add subpixel order */
454done:
455    drm_mode_destroy(dev, adjusted_mode);
456    if (!ret) {
457        crtc->hwmode = saved_hwmode;
458        crtc->mode = saved_mode;
459        crtc->x = saved_x;
460        crtc->y = saved_y;
461    }
462
463    return ret;
464}
465EXPORT_SYMBOL(drm_crtc_helper_set_mode);
466
467
468static int
469drm_crtc_helper_disable(struct drm_crtc *crtc)
470{
471    struct drm_device *dev = crtc->dev;
472    struct drm_connector *connector;
473    struct drm_encoder *encoder;
474
475    /* Decouple all encoders and their attached connectors from this crtc */
476    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
477        if (encoder->crtc != crtc)
478            continue;
479
480        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
481            if (connector->encoder != encoder)
482                continue;
483
484            connector->encoder = NULL;
485        }
486    }
487
488    drm_helper_disable_unused_functions(dev);
489    return 0;
490}
491
492/**
493 * drm_crtc_helper_set_config - set a new config from userspace
494 * @crtc: CRTC to setup
495 * @crtc_info: user provided configuration
496 * @new_mode: new mode to set
497 * @connector_set: set of connectors for the new config
498 * @fb: new framebuffer
499 *
500 * LOCKING:
501 * Caller must hold mode config lock.
502 *
503 * Setup a new configuration, provided by the user in @crtc_info, and enable
504 * it.
505 *
506 * RETURNS:
507 * Zero. (FIXME)
508 */
509int drm_crtc_helper_set_config(struct drm_mode_set *set)
510{
511    struct drm_device *dev;
512    struct drm_crtc *save_crtcs, *new_crtc, *crtc;
513    struct drm_encoder *save_encoders, *new_encoder, *encoder;
514    struct drm_framebuffer *old_fb = NULL;
515    bool mode_changed = false; /* if true do a full mode set */
516    bool fb_changed = false; /* if true and !mode_changed just do a flip */
517    struct drm_connector *save_connectors, *connector;
518    int count = 0, ro, fail = 0;
519    struct drm_crtc_helper_funcs *crtc_funcs;
520    struct drm_mode_set save_set;
521    int ret;
522    int i;
523
524    DRM_DEBUG_KMS("\n");
525
526    if (!set)
527        return -EINVAL;
528
529    if (!set->crtc)
530        return -EINVAL;
531
532    if (!set->crtc->helper_private)
533        return -EINVAL;
534
535    crtc_funcs = set->crtc->helper_private;
536
537    if (!set->mode)
538        set->fb = NULL;
539
540    if (set->fb) {
541        DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
542                set->crtc->base.id, set->fb->base.id,
543                (int)set->num_connectors, set->x, set->y);
544    } else {
545        DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
546        return drm_crtc_helper_disable(set->crtc);
547    }
548
549    dev = set->crtc->dev;
550
551    /* Allocate space for the backup of all (non-pointer) crtc, encoder and
552     * connector data. */
553    save_crtcs = kzalloc(dev->mode_config.num_crtc *
554                 sizeof(struct drm_crtc), GFP_KERNEL);
555    if (!save_crtcs)
556        return -ENOMEM;
557
558    save_encoders = kzalloc(dev->mode_config.num_encoder *
559                sizeof(struct drm_encoder), GFP_KERNEL);
560    if (!save_encoders) {
561        kfree(save_crtcs);
562        return -ENOMEM;
563    }
564
565    save_connectors = kzalloc(dev->mode_config.num_connector *
566                sizeof(struct drm_connector), GFP_KERNEL);
567    if (!save_connectors) {
568        kfree(save_crtcs);
569        kfree(save_encoders);
570        return -ENOMEM;
571    }
572
573    /* Copy data. Note that driver private data is not affected.
574     * Should anything bad happen only the expected state is
575     * restored, not the drivers personal bookkeeping.
576     */
577    count = 0;
578    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
579        save_crtcs[count++] = *crtc;
580    }
581
582    count = 0;
583    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
584        save_encoders[count++] = *encoder;
585    }
586
587    count = 0;
588    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
589        save_connectors[count++] = *connector;
590    }
591
592    save_set.crtc = set->crtc;
593    save_set.mode = &set->crtc->mode;
594    save_set.x = set->crtc->x;
595    save_set.y = set->crtc->y;
596    save_set.fb = set->crtc->fb;
597
598    /* We should be able to check here if the fb has the same properties
599     * and then just flip_or_move it */
600    if (set->crtc->fb != set->fb) {
601        /* If we have no fb then treat it as a full mode set */
602        if (set->crtc->fb == NULL) {
603            DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
604            mode_changed = true;
605        } else if (set->fb == NULL) {
606            mode_changed = true;
607        } else if (set->fb->depth != set->crtc->fb->depth) {
608            mode_changed = true;
609        } else if (set->fb->bits_per_pixel !=
610               set->crtc->fb->bits_per_pixel) {
611            mode_changed = true;
612        } else
613            fb_changed = true;
614    }
615
616    if (set->x != set->crtc->x || set->y != set->crtc->y)
617        fb_changed = true;
618
619    if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
620        DRM_DEBUG_KMS("modes are different, full mode set\n");
621        drm_mode_debug_printmodeline(&set->crtc->mode);
622        drm_mode_debug_printmodeline(set->mode);
623        mode_changed = true;
624    }
625
626    /* a) traverse passed in connector list and get encoders for them */
627    count = 0;
628    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
629        struct drm_connector_helper_funcs *connector_funcs =
630            connector->helper_private;
631        new_encoder = connector->encoder;
632        for (ro = 0; ro < set->num_connectors; ro++) {
633            if (set->connectors[ro] == connector) {
634                new_encoder = connector_funcs->best_encoder(connector);
635                /* if we can't get an encoder for a connector
636                   we are setting now - then fail */
637                if (new_encoder == NULL)
638                    /* don't break so fail path works correct */
639                    fail = 1;
640                break;
641            }
642        }
643
644        if (new_encoder != connector->encoder) {
645            DRM_DEBUG_KMS("encoder changed, full mode switch\n");
646            mode_changed = true;
647            /* If the encoder is reused for another connector, then
648             * the appropriate crtc will be set later.
649             */
650            if (connector->encoder)
651                connector->encoder->crtc = NULL;
652            connector->encoder = new_encoder;
653        }
654    }
655
656    if (fail) {
657        ret = -EINVAL;
658        goto fail;
659    }
660
661    count = 0;
662    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
663        if (!connector->encoder)
664            continue;
665
666        if (connector->encoder->crtc == set->crtc)
667            new_crtc = NULL;
668        else
669            new_crtc = connector->encoder->crtc;
670
671        for (ro = 0; ro < set->num_connectors; ro++) {
672            if (set->connectors[ro] == connector)
673                new_crtc = set->crtc;
674        }
675
676        /* Make sure the new CRTC will work with the encoder */
677        if (new_crtc &&
678            !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
679            ret = -EINVAL;
680            goto fail;
681        }
682        if (new_crtc != connector->encoder->crtc) {
683            DRM_DEBUG_KMS("crtc changed, full mode switch\n");
684            mode_changed = true;
685            connector->encoder->crtc = new_crtc;
686        }
687        if (new_crtc) {
688            DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
689                connector->base.id, drm_get_connector_name(connector),
690                new_crtc->base.id);
691        } else {
692            DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
693                connector->base.id, drm_get_connector_name(connector));
694        }
695    }
696
697    /* mode_set_base is not a required function */
698    if (fb_changed && !crtc_funcs->mode_set_base)
699        mode_changed = true;
700
701    if (mode_changed) {
702        set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
703        if (set->crtc->enabled) {
704            DRM_DEBUG_KMS("attempting to set mode from"
705                    " userspace\n");
706            drm_mode_debug_printmodeline(set->mode);
707            old_fb = set->crtc->fb;
708            set->crtc->fb = set->fb;
709            if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
710                              set->x, set->y,
711                              old_fb)) {
712                DRM_ERROR("failed to set mode on [CRTC:%d]\n",
713                      set->crtc->base.id);
714                set->crtc->fb = old_fb;
715                ret = -EINVAL;
716                goto fail;
717            }
718            DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
719            for (i = 0; i < set->num_connectors; i++) {
720                DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
721                          drm_get_connector_name(set->connectors[i]));
722                set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
723            }
724        }
725        drm_helper_disable_unused_functions(dev);
726    } else if (fb_changed) {
727        set->crtc->x = set->x;
728        set->crtc->y = set->y;
729
730        old_fb = set->crtc->fb;
731        if (set->crtc->fb != set->fb)
732            set->crtc->fb = set->fb;
733        ret = crtc_funcs->mode_set_base(set->crtc,
734                        set->x, set->y, old_fb);
735        if (ret != 0) {
736            set->crtc->fb = old_fb;
737            goto fail;
738        }
739    }
740
741    kfree(save_connectors);
742    kfree(save_encoders);
743    kfree(save_crtcs);
744    return 0;
745
746fail:
747    /* Restore all previous data. */
748    count = 0;
749    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
750        *crtc = save_crtcs[count++];
751    }
752
753    count = 0;
754    list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
755        *encoder = save_encoders[count++];
756    }
757
758    count = 0;
759    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
760        *connector = save_connectors[count++];
761    }
762
763    /* Try to restore the config */
764    if (mode_changed &&
765        !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
766                      save_set.y, save_set.fb))
767        DRM_ERROR("failed to restore config after modeset failure\n");
768
769    kfree(save_connectors);
770    kfree(save_encoders);
771    kfree(save_crtcs);
772    return ret;
773}
774EXPORT_SYMBOL(drm_crtc_helper_set_config);
775
776static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
777{
778    int dpms = DRM_MODE_DPMS_OFF;
779    struct drm_connector *connector;
780    struct drm_device *dev = encoder->dev;
781
782    list_for_each_entry(connector, &dev->mode_config.connector_list, head)
783        if (connector->encoder == encoder)
784            if (connector->dpms < dpms)
785                dpms = connector->dpms;
786    return dpms;
787}
788
789static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
790{
791    int dpms = DRM_MODE_DPMS_OFF;
792    struct drm_connector *connector;
793    struct drm_device *dev = crtc->dev;
794
795    list_for_each_entry(connector, &dev->mode_config.connector_list, head)
796        if (connector->encoder && connector->encoder->crtc == crtc)
797            if (connector->dpms < dpms)
798                dpms = connector->dpms;
799    return dpms;
800}
801
802/**
803 * drm_helper_connector_dpms
804 * @connector affected connector
805 * @mode DPMS mode
806 *
807 * Calls the low-level connector DPMS function, then
808 * calls appropriate encoder and crtc DPMS functions as well
809 */
810void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
811{
812    struct drm_encoder *encoder = connector->encoder;
813    struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
814    int old_dpms;
815
816    if (mode == connector->dpms)
817        return;
818
819    old_dpms = connector->dpms;
820    connector->dpms = mode;
821
822    /* from off to on, do crtc then encoder */
823    if (mode < old_dpms) {
824        if (crtc) {
825            struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
826            if (crtc_funcs->dpms)
827                (*crtc_funcs->dpms) (crtc,
828                             drm_helper_choose_crtc_dpms(crtc));
829        }
830        if (encoder) {
831            struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
832            if (encoder_funcs->dpms)
833                (*encoder_funcs->dpms) (encoder,
834                            drm_helper_choose_encoder_dpms(encoder));
835        }
836    }
837
838    /* from on to off, do encoder then crtc */
839    if (mode > old_dpms) {
840        if (encoder) {
841            struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
842            if (encoder_funcs->dpms)
843                (*encoder_funcs->dpms) (encoder,
844                            drm_helper_choose_encoder_dpms(encoder));
845        }
846        if (crtc) {
847            struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
848            if (crtc_funcs->dpms)
849                (*crtc_funcs->dpms) (crtc,
850                             drm_helper_choose_crtc_dpms(crtc));
851        }
852    }
853
854    return;
855}
856EXPORT_SYMBOL(drm_helper_connector_dpms);
857
858int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
859                   struct drm_mode_fb_cmd2 *mode_cmd)
860{
861    int i;
862
863    fb->width = mode_cmd->width;
864    fb->height = mode_cmd->height;
865    for (i = 0; i < 4; i++) {
866        fb->pitches[i] = mode_cmd->pitches[i];
867        fb->offsets[i] = mode_cmd->offsets[i];
868    }
869    drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
870                    &fb->bits_per_pixel);
871    fb->pixel_format = mode_cmd->pixel_format;
872
873    return 0;
874}
875EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
876
877int drm_helper_resume_force_mode(struct drm_device *dev)
878{
879    struct drm_crtc *crtc;
880    struct drm_encoder *encoder;
881    struct drm_encoder_helper_funcs *encoder_funcs;
882    struct drm_crtc_helper_funcs *crtc_funcs;
883    int ret;
884
885    list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
886
887        if (!crtc->enabled)
888            continue;
889
890        ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
891                           crtc->x, crtc->y, crtc->fb);
892
893        if (ret == false)
894            DRM_ERROR("failed to set mode on crtc %p\n", crtc);
895
896        /* Turn off outputs that were already powered off */
897        if (drm_helper_choose_crtc_dpms(crtc)) {
898            list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
899
900                if(encoder->crtc != crtc)
901                    continue;
902
903                encoder_funcs = encoder->helper_private;
904                if (encoder_funcs->dpms)
905                    (*encoder_funcs->dpms) (encoder,
906                                drm_helper_choose_encoder_dpms(encoder));
907            }
908
909            crtc_funcs = crtc->helper_private;
910            if (crtc_funcs->dpms)
911                (*crtc_funcs->dpms) (crtc,
912                             drm_helper_choose_crtc_dpms(crtc));
913        }
914    }
915    /* disable the unused connectors while restoring the modesetting */
916    drm_helper_disable_unused_functions(dev);
917    return 0;
918}
919EXPORT_SYMBOL(drm_helper_resume_force_mode);
920
921#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
922static void output_poll_execute(struct work_struct *work)
923{
924    struct delayed_work *delayed_work = to_delayed_work(work);
925    struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
926    struct drm_connector *connector;
927    enum drm_connector_status old_status;
928    bool repoll = false, changed = false;
929
930    if (!drm_kms_helper_poll)
931        return;
932
933    mutex_lock(&dev->mode_config.mutex);
934    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
935
936        /* if this is HPD or polled don't check it -
937           TV out for instance */
938        if (!connector->polled)
939            continue;
940
941        else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
942            repoll = true;
943
944        old_status = connector->status;
945        /* if we are connected and don't want to poll for disconnect
946           skip it */
947        if (old_status == connector_status_connected &&
948            !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
949            !(connector->polled & DRM_CONNECTOR_POLL_HPD))
950            continue;
951
952        connector->status = connector->funcs->detect(connector, false);
953        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
954                  connector->base.id,
955                  drm_get_connector_name(connector),
956                  old_status, connector->status);
957        if (old_status != connector->status)
958            changed = true;
959    }
960
961    mutex_unlock(&dev->mode_config.mutex);
962
963    if (changed) {
964        /* send a uevent + call fbdev */
965        drm_sysfs_hotplug_event(dev);
966        if (dev->mode_config.funcs->output_poll_changed)
967            dev->mode_config.funcs->output_poll_changed(dev);
968    }
969
970    if (repoll)
971        queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
972}
973
974void drm_kms_helper_poll_disable(struct drm_device *dev)
975{
976    if (!dev->mode_config.poll_enabled)
977        return;
978    cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
979}
980EXPORT_SYMBOL(drm_kms_helper_poll_disable);
981
982void drm_kms_helper_poll_enable(struct drm_device *dev)
983{
984    bool poll = false;
985    struct drm_connector *connector;
986
987    if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
988        return;
989
990    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
991        if (connector->polled)
992            poll = true;
993    }
994
995    if (poll)
996        queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
997}
998EXPORT_SYMBOL(drm_kms_helper_poll_enable);
999
1000void drm_kms_helper_poll_init(struct drm_device *dev)
1001{
1002    INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1003    dev->mode_config.poll_enabled = true;
1004
1005    drm_kms_helper_poll_enable(dev);
1006}
1007EXPORT_SYMBOL(drm_kms_helper_poll_init);
1008
1009void drm_kms_helper_poll_fini(struct drm_device *dev)
1010{
1011    drm_kms_helper_poll_disable(dev);
1012}
1013EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1014
1015void drm_helper_hpd_irq_event(struct drm_device *dev)
1016{
1017    if (!dev->mode_config.poll_enabled)
1018        return;
1019
1020    /* kill timer and schedule immediate execution, this doesn't block */
1021    cancel_delayed_work(&dev->mode_config.output_poll_work);
1022    if (drm_kms_helper_poll)
1023        queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
1024}
1025EXPORT_SYMBOL(drm_helper_hpd_irq_event);
1026

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