1/*
2 * Copyright © 2006-2010 Intel Corporation
3 * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Eric Anholt <eric@anholt.net>
26 * Dave Airlie <airlied@linux.ie>
27 * Jesse Barnes <jesse.barnes@intel.com>
28 * Chris Wilson <chris@chris-wilson.co.uk>
29 */
30
31#include <linux/kernel.h>
32#include <linux/pwm.h>
33
34#include <drm/drm_edid.h>
35#include <drm/drm_print.h>
36
37#include "intel_backlight.h"
38#include "intel_connector.h"
39#include "intel_display_core.h"
40#include "intel_display_driver.h"
41#include "intel_display_types.h"
42#include "intel_drrs.h"
43#include "intel_panel.h"
44#include "intel_quirks.h"
45#include "intel_vrr.h"
46
47bool intel_panel_use_ssc(struct intel_display *display)
48{
49 if (display->params.panel_use_ssc >= 0)
50 return display->params.panel_use_ssc != 0;
51 return display->vbt.lvds_use_ssc &&
52 !intel_has_quirk(display, quirk: QUIRK_LVDS_SSC_DISABLE);
53}
54
55const struct drm_display_mode *
56intel_panel_preferred_fixed_mode(struct intel_connector *connector)
57{
58 return list_first_entry_or_null(&connector->panel.fixed_modes,
59 struct drm_display_mode, head);
60}
61
62static bool is_best_fixed_mode(struct intel_connector *connector,
63 int vrefresh, int fixed_mode_vrefresh,
64 const struct drm_display_mode *best_mode)
65{
66 /* we want to always return something */
67 if (!best_mode)
68 return true;
69
70 /*
71 * With VRR always pick a mode with equal/higher than requested
72 * vrefresh, which we can then reduce to match the requested
73 * vrefresh by extending the vblank length.
74 */
75 if (intel_vrr_is_in_range(connector, vrefresh) &&
76 intel_vrr_is_in_range(connector, vrefresh: fixed_mode_vrefresh) &&
77 fixed_mode_vrefresh < vrefresh)
78 return false;
79
80 /* pick the fixed_mode that is closest in terms of vrefresh */
81 return abs(fixed_mode_vrefresh - vrefresh) <
82 abs(drm_mode_vrefresh(best_mode) - vrefresh);
83}
84
85const struct drm_display_mode *
86intel_panel_fixed_mode(struct intel_connector *connector,
87 const struct drm_display_mode *mode)
88{
89 const struct drm_display_mode *fixed_mode, *best_mode = NULL;
90 int vrefresh = drm_mode_vrefresh(mode);
91
92 list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
93 int fixed_mode_vrefresh = drm_mode_vrefresh(mode: fixed_mode);
94
95 if (is_best_fixed_mode(connector, vrefresh,
96 fixed_mode_vrefresh, best_mode))
97 best_mode = fixed_mode;
98 }
99
100 return best_mode;
101}
102
103static bool is_alt_drrs_mode(const struct drm_display_mode *mode,
104 const struct drm_display_mode *preferred_mode)
105{
106 return drm_mode_match(mode1: mode, mode2: preferred_mode,
107 DRM_MODE_MATCH_TIMINGS |
108 DRM_MODE_MATCH_FLAGS |
109 DRM_MODE_MATCH_3D_FLAGS) &&
110 mode->clock != preferred_mode->clock;
111}
112
113static bool is_alt_fixed_mode(const struct drm_display_mode *mode,
114 const struct drm_display_mode *preferred_mode)
115{
116 u32 sync_flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC |
117 DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC;
118
119 return (mode->flags & ~sync_flags) == (preferred_mode->flags & ~sync_flags) &&
120 mode->hdisplay == preferred_mode->hdisplay &&
121 mode->vdisplay == preferred_mode->vdisplay;
122}
123
124const struct drm_display_mode *
125intel_panel_downclock_mode(struct intel_connector *connector,
126 const struct drm_display_mode *adjusted_mode)
127{
128 const struct drm_display_mode *fixed_mode, *best_mode = NULL;
129 int min_vrefresh = connector->panel.vbt.seamless_drrs_min_refresh_rate;
130 int max_vrefresh = drm_mode_vrefresh(mode: adjusted_mode);
131
132 /* pick the fixed_mode with the lowest refresh rate */
133 list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
134 int vrefresh = drm_mode_vrefresh(mode: fixed_mode);
135
136 if (is_alt_drrs_mode(mode: fixed_mode, preferred_mode: adjusted_mode) &&
137 vrefresh >= min_vrefresh && vrefresh < max_vrefresh) {
138 max_vrefresh = vrefresh;
139 best_mode = fixed_mode;
140 }
141 }
142
143 return best_mode;
144}
145
146const struct drm_display_mode *
147intel_panel_highest_mode(struct intel_connector *connector,
148 const struct drm_display_mode *adjusted_mode)
149{
150 const struct drm_display_mode *fixed_mode, *best_mode = adjusted_mode;
151
152 /* pick the fixed_mode that has the highest clock */
153 list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
154 if (fixed_mode->clock > best_mode->clock)
155 best_mode = fixed_mode;
156 }
157
158 return best_mode;
159}
160
161int intel_panel_get_modes(struct intel_connector *connector)
162{
163 const struct drm_display_mode *fixed_mode;
164 int num_modes = 0;
165
166 list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
167 struct drm_display_mode *mode;
168
169 mode = drm_mode_duplicate(dev: connector->base.dev, mode: fixed_mode);
170 if (mode) {
171 drm_mode_probed_add(connector: &connector->base, mode);
172 num_modes++;
173 }
174 }
175
176 return num_modes;
177}
178
179static bool has_drrs_modes(struct intel_connector *connector)
180{
181 const struct drm_display_mode *mode1;
182
183 list_for_each_entry(mode1, &connector->panel.fixed_modes, head) {
184 const struct drm_display_mode *mode2 = mode1;
185
186 list_for_each_entry_continue(mode2, &connector->panel.fixed_modes, head) {
187 if (is_alt_drrs_mode(mode: mode1, preferred_mode: mode2))
188 return true;
189 }
190 }
191
192 return false;
193}
194
195enum drrs_type intel_panel_drrs_type(struct intel_connector *connector)
196{
197 return connector->panel.vbt.drrs_type;
198}
199
200int intel_panel_compute_config(struct intel_connector *connector,
201 struct drm_display_mode *adjusted_mode)
202{
203 const struct drm_display_mode *fixed_mode =
204 intel_panel_fixed_mode(connector, mode: adjusted_mode);
205 int vrefresh, fixed_mode_vrefresh;
206 bool is_vrr;
207
208 if (!fixed_mode)
209 return 0;
210
211 vrefresh = drm_mode_vrefresh(mode: adjusted_mode);
212 fixed_mode_vrefresh = drm_mode_vrefresh(mode: fixed_mode);
213
214 /*
215 * Assume that we shouldn't muck about with the
216 * timings if they don't land in the VRR range.
217 */
218 is_vrr = intel_vrr_is_in_range(connector, vrefresh) &&
219 intel_vrr_is_in_range(connector, vrefresh: fixed_mode_vrefresh);
220
221 if (!is_vrr) {
222 /*
223 * We don't want to lie too much to the user about the refresh
224 * rate they're going to get. But we have to allow a bit of latitude
225 * for Xorg since it likes to automagically cook up modes with slightly
226 * off refresh rates.
227 */
228 if (abs(vrefresh - fixed_mode_vrefresh) > 1) {
229 drm_dbg_kms(connector->base.dev,
230 "[CONNECTOR:%d:%s] Requested mode vrefresh (%d Hz) does not match fixed mode vrefresh (%d Hz)\n",
231 connector->base.base.id, connector->base.name,
232 vrefresh, fixed_mode_vrefresh);
233
234 return -EINVAL;
235 }
236 }
237
238 drm_mode_copy(dst: adjusted_mode, src: fixed_mode);
239
240 if (is_vrr && fixed_mode_vrefresh != vrefresh)
241 adjusted_mode->vtotal =
242 DIV_ROUND_CLOSEST(adjusted_mode->clock * 1000,
243 adjusted_mode->htotal * vrefresh);
244
245 drm_mode_set_crtcinfo(p: adjusted_mode, adjust_flags: 0);
246
247 return 0;
248}
249
250static void intel_panel_add_edid_alt_fixed_modes(struct intel_connector *connector)
251{
252 struct intel_display *display = to_intel_display(connector);
253 const struct drm_display_mode *preferred_mode =
254 intel_panel_preferred_fixed_mode(connector);
255 struct drm_display_mode *mode, *next;
256
257 list_for_each_entry_safe(mode, next, &connector->base.probed_modes, head) {
258 if (!is_alt_fixed_mode(mode, preferred_mode))
259 continue;
260
261 drm_dbg_kms(display->drm,
262 "[CONNECTOR:%d:%s] using alternate EDID fixed mode: " DRM_MODE_FMT "\n",
263 connector->base.base.id, connector->base.name,
264 DRM_MODE_ARG(mode));
265
266 list_move_tail(list: &mode->head, head: &connector->panel.fixed_modes);
267 }
268}
269
270static void intel_panel_add_edid_preferred_mode(struct intel_connector *connector)
271{
272 struct intel_display *display = to_intel_display(connector);
273 struct drm_display_mode *scan, *fixed_mode = NULL;
274
275 if (list_empty(head: &connector->base.probed_modes))
276 return;
277
278 /* make sure the preferred mode is first */
279 list_for_each_entry(scan, &connector->base.probed_modes, head) {
280 if (scan->type & DRM_MODE_TYPE_PREFERRED) {
281 fixed_mode = scan;
282 break;
283 }
284 }
285
286 if (!fixed_mode)
287 fixed_mode = list_first_entry(&connector->base.probed_modes,
288 typeof(*fixed_mode), head);
289
290 drm_dbg_kms(display->drm,
291 "[CONNECTOR:%d:%s] using %s EDID fixed mode: " DRM_MODE_FMT "\n",
292 connector->base.base.id, connector->base.name,
293 fixed_mode->type & DRM_MODE_TYPE_PREFERRED ? "preferred" : "first",
294 DRM_MODE_ARG(fixed_mode));
295
296 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
297
298 list_move_tail(list: &fixed_mode->head, head: &connector->panel.fixed_modes);
299}
300
301static void intel_panel_destroy_probed_modes(struct intel_connector *connector)
302{
303 struct intel_display *display = to_intel_display(connector);
304 struct drm_display_mode *mode, *next;
305
306 list_for_each_entry_safe(mode, next, &connector->base.probed_modes, head) {
307 drm_dbg_kms(display->drm,
308 "[CONNECTOR:%d:%s] not using EDID mode: " DRM_MODE_FMT "\n",
309 connector->base.base.id, connector->base.name,
310 DRM_MODE_ARG(mode));
311 list_del(entry: &mode->head);
312 drm_mode_destroy(dev: display->drm, mode);
313 }
314}
315
316void intel_panel_add_edid_fixed_modes(struct intel_connector *connector,
317 bool use_alt_fixed_modes)
318{
319 intel_panel_add_edid_preferred_mode(connector);
320 if (intel_panel_preferred_fixed_mode(connector) && use_alt_fixed_modes)
321 intel_panel_add_edid_alt_fixed_modes(connector);
322 intel_panel_destroy_probed_modes(connector);
323}
324
325static void intel_panel_add_fixed_mode(struct intel_connector *connector,
326 struct drm_display_mode *fixed_mode,
327 const char *type)
328{
329 struct intel_display *display = to_intel_display(connector);
330 struct drm_display_info *info = &connector->base.display_info;
331
332 if (!fixed_mode)
333 return;
334
335 fixed_mode->type |= DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
336
337 info->width_mm = fixed_mode->width_mm;
338 info->height_mm = fixed_mode->height_mm;
339
340 drm_dbg_kms(display->drm, "[CONNECTOR:%d:%s] using %s fixed mode: " DRM_MODE_FMT "\n",
341 connector->base.base.id, connector->base.name, type,
342 DRM_MODE_ARG(fixed_mode));
343
344 list_add_tail(new: &fixed_mode->head, head: &connector->panel.fixed_modes);
345}
346
347void intel_panel_add_vbt_lfp_fixed_mode(struct intel_connector *connector)
348{
349 struct intel_display *display = to_intel_display(connector);
350 const struct drm_display_mode *mode;
351
352 mode = connector->panel.vbt.lfp_vbt_mode;
353 if (!mode)
354 return;
355
356 intel_panel_add_fixed_mode(connector,
357 fixed_mode: drm_mode_duplicate(dev: display->drm, mode),
358 type: "VBT LFP");
359}
360
361void intel_panel_add_vbt_sdvo_fixed_mode(struct intel_connector *connector)
362{
363 struct intel_display *display = to_intel_display(connector);
364 const struct drm_display_mode *mode;
365
366 mode = connector->panel.vbt.sdvo_lvds_vbt_mode;
367 if (!mode)
368 return;
369
370 intel_panel_add_fixed_mode(connector,
371 fixed_mode: drm_mode_duplicate(dev: display->drm, mode),
372 type: "VBT SDVO");
373}
374
375void intel_panel_add_encoder_fixed_mode(struct intel_connector *connector,
376 struct intel_encoder *encoder)
377{
378 intel_panel_add_fixed_mode(connector,
379 fixed_mode: intel_encoder_current_mode(encoder),
380 type: "current (BIOS)");
381}
382
383enum drm_connector_status
384intel_panel_detect(struct drm_connector *connector, bool force)
385{
386 struct intel_display *display = to_intel_display(connector->dev);
387
388 if (!intel_display_device_enabled(display))
389 return connector_status_disconnected;
390
391 if (!intel_display_driver_check_access(display))
392 return connector->status;
393
394 return connector_status_connected;
395}
396
397enum drm_mode_status
398intel_panel_mode_valid(struct intel_connector *connector,
399 const struct drm_display_mode *mode)
400{
401 const struct drm_display_mode *fixed_mode =
402 intel_panel_fixed_mode(connector, mode);
403
404 if (!fixed_mode)
405 return MODE_OK;
406
407 if (mode->hdisplay != fixed_mode->hdisplay)
408 return MODE_PANEL;
409
410 if (mode->vdisplay != fixed_mode->vdisplay)
411 return MODE_PANEL;
412
413 if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(mode: fixed_mode))
414 return MODE_PANEL;
415
416 return MODE_OK;
417}
418
419void intel_panel_init_alloc(struct intel_connector *connector)
420{
421 struct intel_panel *panel = &connector->panel;
422
423 connector->panel.vbt.panel_type = -1;
424 connector->panel.vbt.backlight.controller = -1;
425 INIT_LIST_HEAD(list: &panel->fixed_modes);
426}
427
428int intel_panel_init(struct intel_connector *connector,
429 const struct drm_edid *fixed_edid)
430{
431 struct intel_panel *panel = &connector->panel;
432
433 panel->fixed_edid = fixed_edid;
434
435 intel_backlight_init_funcs(panel);
436
437 if (!has_drrs_modes(connector))
438 connector->panel.vbt.drrs_type = DRRS_TYPE_NONE;
439
440 drm_dbg_kms(connector->base.dev,
441 "[CONNECTOR:%d:%s] DRRS type: %s\n",
442 connector->base.base.id, connector->base.name,
443 intel_drrs_type_str(intel_panel_drrs_type(connector)));
444
445 return 0;
446}
447
448void intel_panel_fini(struct intel_connector *connector)
449{
450 struct intel_panel *panel = &connector->panel;
451 struct drm_display_mode *fixed_mode, *next;
452
453 if (!IS_ERR_OR_NULL(ptr: panel->fixed_edid))
454 drm_edid_free(drm_edid: panel->fixed_edid);
455
456 intel_backlight_destroy(panel);
457
458 intel_bios_fini_panel(panel);
459
460 list_for_each_entry_safe(fixed_mode, next, &panel->fixed_modes, head) {
461 list_del(entry: &fixed_mode->head);
462 drm_mode_destroy(dev: connector->base.dev, mode: fixed_mode);
463 }
464}
465
466/*
467 * If the panel was already enabled at probe, and we took over the state, the
468 * panel prepared state is out of sync, and the panel followers won't be
469 * notified. We need to call drm_panel_prepare() on enabled panels.
470 *
471 * It would be natural to handle this e.g. in the connector ->sync_state hook at
472 * intel_modeset_readout_hw_state(), but that's unfortunately too early. We
473 * don't have drm_connector::kdev at that time. For now, figure out the state at
474 * ->late_register, and sync there.
475 */
476static void intel_panel_sync_state(struct intel_connector *connector)
477{
478 struct intel_display *display = to_intel_display(connector);
479 struct drm_connector_state *conn_state;
480 struct intel_crtc *crtc;
481 int ret;
482
483 ret = drm_modeset_lock(lock: &display->drm->mode_config.connection_mutex, NULL);
484 if (ret)
485 return;
486
487 conn_state = connector->base.state;
488
489 crtc = to_intel_crtc(conn_state->crtc);
490 if (crtc) {
491 struct intel_crtc_state *crtc_state;
492
493 crtc_state = to_intel_crtc_state(crtc->base.state);
494
495 if (crtc_state->hw.active) {
496 drm_dbg_kms(display->drm, "[CONNECTOR:%d:%s] Panel prepare\n",
497 connector->base.base.id, connector->base.name);
498 intel_panel_prepare(crtc_state, conn_state);
499 }
500 }
501
502 drm_modeset_unlock(lock: &display->drm->mode_config.connection_mutex);
503}
504
505static const struct drm_panel_funcs dummy_panel_funcs = {
506};
507
508int intel_panel_register(struct intel_connector *connector)
509{
510 struct intel_display *display = to_intel_display(connector);
511 struct intel_panel *panel = &connector->panel;
512 int ret;
513
514 ret = intel_backlight_device_register(connector);
515 if (ret)
516 return ret;
517
518 if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI ||
519 connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
520 struct device *dev = connector->base.kdev;
521 struct drm_panel *base;
522
523 /* Sanity check. */
524 if (drm_WARN_ON(display->drm, !dev))
525 goto out;
526
527 /*
528 * We need drm_connector::kdev for allocating the panel, to make
529 * drm_panel_add_follower() lookups work. The kdev is
530 * initialized in drm_sysfs_connector_add(), just before the
531 * connector .late_register() hooks. So we can't allocate the
532 * panel at connector init time, and can't allocate struct
533 * intel_panel with a drm_panel sub-struct. For now, use
534 * __devm_drm_panel_alloc() directly.
535 *
536 * The lookups also depend on drm_connector::fwnode being set in
537 * intel_acpi_assign_connector_fwnodes(). However, if that's
538 * missing, it will gracefully lead to -EPROBE_DEFER in
539 * drm_panel_add_follower().
540 */
541 base = __devm_drm_panel_alloc(dev, size: sizeof(*base), offset: 0,
542 funcs: &dummy_panel_funcs,
543 connector_type: connector->base.connector_type);
544 if (IS_ERR(ptr: base)) {
545 ret = PTR_ERR(ptr: base);
546 goto err;
547 }
548
549 panel->base = base;
550
551 drm_panel_add(panel: panel->base);
552
553 drm_dbg_kms(display->drm, "[CONNECTOR:%d:%s] Registered panel device '%s', has fwnode: %s\n",
554 connector->base.base.id, connector->base.name,
555 dev_name(dev), str_yes_no(dev_fwnode(dev)));
556
557 intel_panel_sync_state(connector);
558 }
559
560out:
561 return 0;
562
563err:
564 intel_backlight_device_unregister(connector);
565
566 return ret;
567}
568
569void intel_panel_unregister(struct intel_connector *connector)
570{
571 struct intel_panel *panel = &connector->panel;
572
573 if (panel->base)
574 drm_panel_remove(panel: panel->base);
575
576 intel_backlight_device_unregister(connector);
577}
578
579/* Notify followers, if any, about power being up. */
580void intel_panel_prepare(const struct intel_crtc_state *crtc_state,
581 const struct drm_connector_state *conn_state)
582{
583 struct intel_connector *connector = to_intel_connector(conn_state->connector);
584 struct intel_panel *panel = &connector->panel;
585
586 drm_panel_prepare(panel: panel->base);
587}
588
589/* Notify followers, if any, about power going down. */
590void intel_panel_unprepare(const struct drm_connector_state *old_conn_state)
591{
592 struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
593 struct intel_panel *panel = &connector->panel;
594
595 drm_panel_unprepare(panel: panel->base);
596}
597

source code of linux/drivers/gpu/drm/i915/display/intel_panel.c