1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/module.h>
7 #include <linux/slab.h>
8 #include <linux/uaccess.h>
9 #include <linux/debugfs.h>
10 #include <linux/component.h>
11 #include <linux/of_irq.h>
12 #include <linux/delay.h>
13 #include <drm/display/drm_dp_aux_bus.h>
14
15 #include "msm_drv.h"
16 #include "msm_kms.h"
17 #include "dp_hpd.h"
18 #include "dp_parser.h"
19 #include "dp_power.h"
20 #include "dp_catalog.h"
21 #include "dp_aux.h"
22 #include "dp_reg.h"
23 #include "dp_link.h"
24 #include "dp_panel.h"
25 #include "dp_ctrl.h"
26 #include "dp_display.h"
27 #include "dp_drm.h"
28 #include "dp_audio.h"
29 #include "dp_debug.h"
30
31 #define HPD_STRING_SIZE 30
32
33 enum {
34 ISR_DISCONNECTED,
35 ISR_CONNECT_PENDING,
36 ISR_CONNECTED,
37 ISR_HPD_REPLUG_COUNT,
38 ISR_IRQ_HPD_PULSE_COUNT,
39 ISR_HPD_LO_GLITH_COUNT,
40 };
41
42 /* event thread connection state */
43 enum {
44 ST_DISCONNECTED,
45 ST_MAINLINK_READY,
46 ST_CONNECTED,
47 ST_DISCONNECT_PENDING,
48 ST_DISPLAY_OFF,
49 ST_SUSPENDED,
50 };
51
52 enum {
53 EV_NO_EVENT,
54 /* hpd events */
55 EV_HPD_INIT_SETUP,
56 EV_HPD_PLUG_INT,
57 EV_IRQ_HPD_INT,
58 EV_HPD_UNPLUG_INT,
59 EV_USER_NOTIFICATION,
60 };
61
62 #define EVENT_TIMEOUT (HZ/10) /* 100ms */
63 #define DP_EVENT_Q_MAX 8
64
65 #define DP_TIMEOUT_NONE 0
66
67 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
68
69 struct dp_event {
70 u32 event_id;
71 u32 data;
72 u32 delay;
73 };
74
75 struct dp_display_private {
76 char *name;
77 int irq;
78
79 unsigned int id;
80
81 /* state variables */
82 bool core_initialized;
83 bool phy_initialized;
84 bool hpd_irq_on;
85 bool audio_supported;
86
87 struct drm_device *drm_dev;
88 struct platform_device *pdev;
89 struct dentry *root;
90
91 struct dp_usbpd *usbpd;
92 struct dp_parser *parser;
93 struct dp_power *power;
94 struct dp_catalog *catalog;
95 struct drm_dp_aux *aux;
96 struct dp_link *link;
97 struct dp_panel *panel;
98 struct dp_ctrl *ctrl;
99 struct dp_debug *debug;
100
101 struct dp_usbpd_cb usbpd_cb;
102 struct dp_display_mode dp_mode;
103 struct msm_dp dp_display;
104
105 /* wait for audio signaling */
106 struct completion audio_comp;
107
108 /* event related only access by event thread */
109 struct mutex event_mutex;
110 wait_queue_head_t event_q;
111 u32 hpd_state;
112 u32 event_pndx;
113 u32 event_gndx;
114 struct task_struct *ev_tsk;
115 struct dp_event event_list[DP_EVENT_Q_MAX];
116 spinlock_t event_lock;
117
118 bool wide_bus_en;
119
120 struct dp_audio *audio;
121 };
122
123 struct msm_dp_desc {
124 phys_addr_t io_start;
125 unsigned int connector_type;
126 bool wide_bus_en;
127 };
128
129 struct msm_dp_config {
130 const struct msm_dp_desc *descs;
131 size_t num_descs;
132 };
133
134 static const struct msm_dp_config sc7180_dp_cfg = {
135 .descs = (const struct msm_dp_desc[]) {
136 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
137 },
138 .num_descs = 1,
139 };
140
141 static const struct msm_dp_config sc7280_dp_cfg = {
142 .descs = (const struct msm_dp_desc[]) {
143 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
144 [MSM_DP_CONTROLLER_1] = { .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
145 },
146 .num_descs = 2,
147 };
148
149 static const struct msm_dp_config sc8180x_dp_cfg = {
150 .descs = (const struct msm_dp_desc[]) {
151 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
152 [MSM_DP_CONTROLLER_1] = { .io_start = 0x0ae98000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
153 [MSM_DP_CONTROLLER_2] = { .io_start = 0x0ae9a000, .connector_type = DRM_MODE_CONNECTOR_eDP },
154 },
155 .num_descs = 3,
156 };
157
158 static const struct msm_dp_config sm8350_dp_cfg = {
159 .descs = (const struct msm_dp_desc[]) {
160 [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
161 },
162 .num_descs = 1,
163 };
164
165 static const struct of_device_id dp_dt_match[] = {
166 { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
167 { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_cfg },
168 { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_cfg },
169 { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_cfg },
170 { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_cfg },
171 { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_cfg },
172 {}
173 };
174
dev_get_dp_display_private(struct device * dev)175 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
176 {
177 struct msm_dp *dp = dev_get_drvdata(dev);
178
179 return container_of(dp, struct dp_display_private, dp_display);
180 }
181
dp_add_event(struct dp_display_private * dp_priv,u32 event,u32 data,u32 delay)182 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
183 u32 data, u32 delay)
184 {
185 unsigned long flag;
186 struct dp_event *todo;
187 int pndx;
188
189 spin_lock_irqsave(&dp_priv->event_lock, flag);
190 pndx = dp_priv->event_pndx + 1;
191 pndx %= DP_EVENT_Q_MAX;
192 if (pndx == dp_priv->event_gndx) {
193 pr_err("event_q is full: pndx=%d gndx=%d\n",
194 dp_priv->event_pndx, dp_priv->event_gndx);
195 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
196 return -EPERM;
197 }
198 todo = &dp_priv->event_list[dp_priv->event_pndx++];
199 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
200 todo->event_id = event;
201 todo->data = data;
202 todo->delay = delay;
203 wake_up(&dp_priv->event_q);
204 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
205
206 return 0;
207 }
208
dp_del_event(struct dp_display_private * dp_priv,u32 event)209 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
210 {
211 unsigned long flag;
212 struct dp_event *todo;
213 u32 gndx;
214
215 spin_lock_irqsave(&dp_priv->event_lock, flag);
216 if (dp_priv->event_pndx == dp_priv->event_gndx) {
217 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
218 return -ENOENT;
219 }
220
221 gndx = dp_priv->event_gndx;
222 while (dp_priv->event_pndx != gndx) {
223 todo = &dp_priv->event_list[gndx];
224 if (todo->event_id == event) {
225 todo->event_id = EV_NO_EVENT; /* deleted */
226 todo->delay = 0;
227 }
228 gndx++;
229 gndx %= DP_EVENT_Q_MAX;
230 }
231 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
232
233 return 0;
234 }
235
dp_display_signal_audio_start(struct msm_dp * dp_display)236 void dp_display_signal_audio_start(struct msm_dp *dp_display)
237 {
238 struct dp_display_private *dp;
239
240 dp = container_of(dp_display, struct dp_display_private, dp_display);
241
242 reinit_completion(&dp->audio_comp);
243 }
244
dp_display_signal_audio_complete(struct msm_dp * dp_display)245 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
246 {
247 struct dp_display_private *dp;
248
249 dp = container_of(dp_display, struct dp_display_private, dp_display);
250
251 complete_all(&dp->audio_comp);
252 }
253
254 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
255
dp_display_bind(struct device * dev,struct device * master,void * data)256 static int dp_display_bind(struct device *dev, struct device *master,
257 void *data)
258 {
259 int rc = 0;
260 struct dp_display_private *dp = dev_get_dp_display_private(dev);
261 struct msm_drm_private *priv = dev_get_drvdata(master);
262 struct drm_device *drm = priv->dev;
263
264 dp->dp_display.drm_dev = drm;
265 priv->dp[dp->id] = &dp->dp_display;
266
267 rc = dp->parser->parse(dp->parser);
268 if (rc) {
269 DRM_ERROR("device tree parsing failed\n");
270 goto end;
271 }
272
273
274 dp->drm_dev = drm;
275 dp->aux->drm_dev = drm;
276 rc = dp_aux_register(dp->aux);
277 if (rc) {
278 DRM_ERROR("DRM DP AUX register failed\n");
279 goto end;
280 }
281
282 rc = dp_power_client_init(dp->power);
283 if (rc) {
284 DRM_ERROR("Power client create failed\n");
285 goto end;
286 }
287
288 rc = dp_register_audio_driver(dev, dp->audio);
289 if (rc) {
290 DRM_ERROR("Audio registration Dp failed\n");
291 goto end;
292 }
293
294 rc = dp_hpd_event_thread_start(dp);
295 if (rc) {
296 DRM_ERROR("Event thread create failed\n");
297 goto end;
298 }
299
300 return 0;
301 end:
302 return rc;
303 }
304
dp_display_unbind(struct device * dev,struct device * master,void * data)305 static void dp_display_unbind(struct device *dev, struct device *master,
306 void *data)
307 {
308 struct dp_display_private *dp = dev_get_dp_display_private(dev);
309 struct msm_drm_private *priv = dev_get_drvdata(master);
310
311 /* disable all HPD interrupts */
312 if (dp->core_initialized)
313 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
314
315 kthread_stop(dp->ev_tsk);
316
317 dp_power_client_deinit(dp->power);
318 dp_aux_unregister(dp->aux);
319 dp->drm_dev = NULL;
320 dp->aux->drm_dev = NULL;
321 priv->dp[dp->id] = NULL;
322 }
323
324 static const struct component_ops dp_display_comp_ops = {
325 .bind = dp_display_bind,
326 .unbind = dp_display_unbind,
327 };
328
dp_display_is_ds_bridge(struct dp_panel * panel)329 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
330 {
331 return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
332 DP_DWN_STRM_PORT_PRESENT);
333 }
334
dp_display_is_sink_count_zero(struct dp_display_private * dp)335 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
336 {
337 drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
338 dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
339 dp->link->sink_count);
340 return dp_display_is_ds_bridge(dp->panel) &&
341 (dp->link->sink_count == 0);
342 }
343
dp_display_send_hpd_event(struct msm_dp * dp_display)344 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
345 {
346 struct dp_display_private *dp;
347 struct drm_connector *connector;
348
349 dp = container_of(dp_display, struct dp_display_private, dp_display);
350
351 connector = dp->dp_display.connector;
352 drm_helper_hpd_irq_event(connector->dev);
353 }
354
355
dp_display_send_hpd_notification(struct dp_display_private * dp,bool hpd)356 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
357 bool hpd)
358 {
359 if ((hpd && dp->dp_display.is_connected) ||
360 (!hpd && !dp->dp_display.is_connected)) {
361 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
362 (hpd ? "on" : "off"));
363 return 0;
364 }
365
366 /* reset video pattern flag on disconnect */
367 if (!hpd)
368 dp->panel->video_test = false;
369
370 dp->dp_display.is_connected = hpd;
371
372 drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
373 dp->dp_display.connector_type, hpd);
374 dp_display_send_hpd_event(&dp->dp_display);
375
376 return 0;
377 }
378
dp_display_process_hpd_high(struct dp_display_private * dp)379 static int dp_display_process_hpd_high(struct dp_display_private *dp)
380 {
381 int rc = 0;
382 struct edid *edid;
383
384 dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
385
386 rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
387 if (rc)
388 goto end;
389
390 dp_link_process_request(dp->link);
391
392 edid = dp->panel->edid;
393
394 dp->audio_supported = drm_detect_monitor_audio(edid);
395 dp_panel_handle_sink_request(dp->panel);
396
397 dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
398
399 /*
400 * set sink to normal operation mode -- D0
401 * before dpcd read
402 */
403 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
404
405 dp_link_reset_phy_params_vx_px(dp->link);
406 rc = dp_ctrl_on_link(dp->ctrl);
407 if (rc) {
408 DRM_ERROR("failed to complete DP link training\n");
409 goto end;
410 }
411
412 dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
413
414 end:
415 return rc;
416 }
417
dp_display_host_phy_init(struct dp_display_private * dp)418 static void dp_display_host_phy_init(struct dp_display_private *dp)
419 {
420 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
421 dp->dp_display.connector_type, dp->core_initialized,
422 dp->phy_initialized);
423
424 if (!dp->phy_initialized) {
425 dp_ctrl_phy_init(dp->ctrl);
426 dp->phy_initialized = true;
427 }
428 }
429
dp_display_host_phy_exit(struct dp_display_private * dp)430 static void dp_display_host_phy_exit(struct dp_display_private *dp)
431 {
432 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
433 dp->dp_display.connector_type, dp->core_initialized,
434 dp->phy_initialized);
435
436 if (dp->phy_initialized) {
437 dp_ctrl_phy_exit(dp->ctrl);
438 dp->phy_initialized = false;
439 }
440 }
441
dp_display_host_init(struct dp_display_private * dp)442 static void dp_display_host_init(struct dp_display_private *dp)
443 {
444 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
445 dp->dp_display.connector_type, dp->core_initialized,
446 dp->phy_initialized);
447
448 dp_power_init(dp->power, false);
449 dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
450 dp_aux_init(dp->aux);
451 dp->core_initialized = true;
452 }
453
dp_display_host_deinit(struct dp_display_private * dp)454 static void dp_display_host_deinit(struct dp_display_private *dp)
455 {
456 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
457 dp->dp_display.connector_type, dp->core_initialized,
458 dp->phy_initialized);
459
460 dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
461 dp_aux_deinit(dp->aux);
462 dp_power_deinit(dp->power);
463 dp->core_initialized = false;
464 }
465
dp_display_usbpd_configure_cb(struct device * dev)466 static int dp_display_usbpd_configure_cb(struct device *dev)
467 {
468 struct dp_display_private *dp = dev_get_dp_display_private(dev);
469
470 dp_display_host_phy_init(dp);
471
472 return dp_display_process_hpd_high(dp);
473 }
474
dp_display_usbpd_disconnect_cb(struct device * dev)475 static int dp_display_usbpd_disconnect_cb(struct device *dev)
476 {
477 return 0;
478 }
479
dp_display_notify_disconnect(struct device * dev)480 static int dp_display_notify_disconnect(struct device *dev)
481 {
482 struct dp_display_private *dp = dev_get_dp_display_private(dev);
483
484 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
485
486 return 0;
487 }
488
dp_display_handle_video_request(struct dp_display_private * dp)489 static void dp_display_handle_video_request(struct dp_display_private *dp)
490 {
491 if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
492 dp->panel->video_test = true;
493 dp_link_send_test_response(dp->link);
494 }
495 }
496
dp_display_handle_port_ststus_changed(struct dp_display_private * dp)497 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
498 {
499 int rc = 0;
500
501 if (dp_display_is_sink_count_zero(dp)) {
502 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
503 if (dp->hpd_state != ST_DISCONNECTED) {
504 dp->hpd_state = ST_DISCONNECT_PENDING;
505 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
506 }
507 } else {
508 if (dp->hpd_state == ST_DISCONNECTED) {
509 dp->hpd_state = ST_MAINLINK_READY;
510 rc = dp_display_process_hpd_high(dp);
511 if (rc)
512 dp->hpd_state = ST_DISCONNECTED;
513 }
514 }
515
516 return rc;
517 }
518
dp_display_handle_irq_hpd(struct dp_display_private * dp)519 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
520 {
521 u32 sink_request = dp->link->sink_request;
522
523 drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
524 if (dp->hpd_state == ST_DISCONNECTED) {
525 if (sink_request & DP_LINK_STATUS_UPDATED) {
526 drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
527 sink_request);
528 DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
529 return -EINVAL;
530 }
531 }
532
533 dp_ctrl_handle_sink_request(dp->ctrl);
534
535 if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
536 dp_display_handle_video_request(dp);
537
538 return 0;
539 }
540
dp_display_usbpd_attention_cb(struct device * dev)541 static int dp_display_usbpd_attention_cb(struct device *dev)
542 {
543 int rc = 0;
544 u32 sink_request;
545 struct dp_display_private *dp = dev_get_dp_display_private(dev);
546
547 /* check for any test request issued by sink */
548 rc = dp_link_process_request(dp->link);
549 if (!rc) {
550 sink_request = dp->link->sink_request;
551 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
552 dp->hpd_state, sink_request);
553 if (sink_request & DS_PORT_STATUS_CHANGED)
554 rc = dp_display_handle_port_ststus_changed(dp);
555 else
556 rc = dp_display_handle_irq_hpd(dp);
557 }
558
559 return rc;
560 }
561
dp_hpd_plug_handle(struct dp_display_private * dp,u32 data)562 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
563 {
564 struct dp_usbpd *hpd = dp->usbpd;
565 u32 state;
566 int ret;
567
568 if (!hpd)
569 return 0;
570
571 mutex_lock(&dp->event_mutex);
572
573 state = dp->hpd_state;
574 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
575 dp->dp_display.connector_type, state);
576
577 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
578 mutex_unlock(&dp->event_mutex);
579 return 0;
580 }
581
582 if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
583 mutex_unlock(&dp->event_mutex);
584 return 0;
585 }
586
587 if (state == ST_DISCONNECT_PENDING) {
588 /* wait until ST_DISCONNECTED */
589 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
590 mutex_unlock(&dp->event_mutex);
591 return 0;
592 }
593
594 ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
595 if (ret) { /* link train failed */
596 dp->hpd_state = ST_DISCONNECTED;
597 } else {
598 dp->hpd_state = ST_MAINLINK_READY;
599 }
600
601 /* enable HDP irq_hpd/replug interrupt */
602 dp_catalog_hpd_config_intr(dp->catalog,
603 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, true);
604
605 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
606 dp->dp_display.connector_type, state);
607 mutex_unlock(&dp->event_mutex);
608
609 /* uevent will complete connection part */
610 return 0;
611 };
612
613 static int dp_display_enable(struct dp_display_private *dp, u32 data);
614 static int dp_display_disable(struct dp_display_private *dp, u32 data);
615
dp_display_handle_plugged_change(struct msm_dp * dp_display,bool plugged)616 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
617 bool plugged)
618 {
619 struct dp_display_private *dp;
620
621 dp = container_of(dp_display,
622 struct dp_display_private, dp_display);
623
624 /* notify audio subsystem only if sink supports audio */
625 if (dp_display->plugged_cb && dp_display->codec_dev &&
626 dp->audio_supported)
627 dp_display->plugged_cb(dp_display->codec_dev, plugged);
628 }
629
dp_hpd_unplug_handle(struct dp_display_private * dp,u32 data)630 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
631 {
632 struct dp_usbpd *hpd = dp->usbpd;
633 u32 state;
634
635 if (!hpd)
636 return 0;
637
638 mutex_lock(&dp->event_mutex);
639
640 state = dp->hpd_state;
641
642 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
643 dp->dp_display.connector_type, state);
644
645 /* disable irq_hpd/replug interrupts */
646 dp_catalog_hpd_config_intr(dp->catalog,
647 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, false);
648
649 /* unplugged, no more irq_hpd handle */
650 dp_del_event(dp, EV_IRQ_HPD_INT);
651
652 if (state == ST_DISCONNECTED) {
653 /* triggered by irq_hdp with sink_count = 0 */
654 if (dp->link->sink_count == 0) {
655 dp_display_host_phy_exit(dp);
656 }
657 dp_display_notify_disconnect(&dp->pdev->dev);
658 mutex_unlock(&dp->event_mutex);
659 return 0;
660 } else if (state == ST_DISCONNECT_PENDING) {
661 mutex_unlock(&dp->event_mutex);
662 return 0;
663 } else if (state == ST_MAINLINK_READY) {
664 dp_ctrl_off_link(dp->ctrl);
665 dp_display_host_phy_exit(dp);
666 dp->hpd_state = ST_DISCONNECTED;
667 dp_display_notify_disconnect(&dp->pdev->dev);
668 mutex_unlock(&dp->event_mutex);
669 return 0;
670 }
671
672 /* disable HPD plug interrupts */
673 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
674
675 /*
676 * We don't need separate work for disconnect as
677 * connect/attention interrupts are disabled
678 */
679 dp_display_notify_disconnect(&dp->pdev->dev);
680
681 if (state == ST_DISPLAY_OFF) {
682 dp->hpd_state = ST_DISCONNECTED;
683 } else {
684 dp->hpd_state = ST_DISCONNECT_PENDING;
685 }
686
687 /* signal the disconnect event early to ensure proper teardown */
688 dp_display_handle_plugged_change(&dp->dp_display, false);
689
690 /* enable HDP plug interrupt to prepare for next plugin */
691 if (!dp->dp_display.is_edp)
692 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
693
694 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
695 dp->dp_display.connector_type, state);
696
697 /* uevent will complete disconnection part */
698 mutex_unlock(&dp->event_mutex);
699 return 0;
700 }
701
dp_irq_hpd_handle(struct dp_display_private * dp,u32 data)702 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
703 {
704 u32 state;
705
706 mutex_lock(&dp->event_mutex);
707
708 /* irq_hpd can happen at either connected or disconnected state */
709 state = dp->hpd_state;
710 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
711 dp->dp_display.connector_type, state);
712
713 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
714 mutex_unlock(&dp->event_mutex);
715 return 0;
716 }
717
718 if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
719 /* wait until ST_CONNECTED */
720 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
721 mutex_unlock(&dp->event_mutex);
722 return 0;
723 }
724
725 dp_display_usbpd_attention_cb(&dp->pdev->dev);
726
727 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
728 dp->dp_display.connector_type, state);
729
730 mutex_unlock(&dp->event_mutex);
731
732 return 0;
733 }
734
dp_display_deinit_sub_modules(struct dp_display_private * dp)735 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
736 {
737 dp_debug_put(dp->debug);
738 dp_audio_put(dp->audio);
739 dp_panel_put(dp->panel);
740 dp_aux_put(dp->aux);
741 }
742
dp_init_sub_modules(struct dp_display_private * dp)743 static int dp_init_sub_modules(struct dp_display_private *dp)
744 {
745 int rc = 0;
746 struct device *dev = &dp->pdev->dev;
747 struct dp_usbpd_cb *cb = &dp->usbpd_cb;
748 struct dp_panel_in panel_in = {
749 .dev = dev,
750 };
751
752 /* Callback APIs used for cable status change event */
753 cb->configure = dp_display_usbpd_configure_cb;
754 cb->disconnect = dp_display_usbpd_disconnect_cb;
755 cb->attention = dp_display_usbpd_attention_cb;
756
757 dp->usbpd = dp_hpd_get(dev, cb);
758 if (IS_ERR(dp->usbpd)) {
759 rc = PTR_ERR(dp->usbpd);
760 DRM_ERROR("failed to initialize hpd, rc = %d\n", rc);
761 dp->usbpd = NULL;
762 goto error;
763 }
764
765 dp->parser = dp_parser_get(dp->pdev);
766 if (IS_ERR(dp->parser)) {
767 rc = PTR_ERR(dp->parser);
768 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
769 dp->parser = NULL;
770 goto error;
771 }
772
773 dp->catalog = dp_catalog_get(dev, &dp->parser->io);
774 if (IS_ERR(dp->catalog)) {
775 rc = PTR_ERR(dp->catalog);
776 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
777 dp->catalog = NULL;
778 goto error;
779 }
780
781 dp->power = dp_power_get(dev, dp->parser);
782 if (IS_ERR(dp->power)) {
783 rc = PTR_ERR(dp->power);
784 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
785 dp->power = NULL;
786 goto error;
787 }
788
789 dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
790 if (IS_ERR(dp->aux)) {
791 rc = PTR_ERR(dp->aux);
792 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
793 dp->aux = NULL;
794 goto error;
795 }
796
797 dp->link = dp_link_get(dev, dp->aux);
798 if (IS_ERR(dp->link)) {
799 rc = PTR_ERR(dp->link);
800 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
801 dp->link = NULL;
802 goto error_link;
803 }
804
805 panel_in.aux = dp->aux;
806 panel_in.catalog = dp->catalog;
807 panel_in.link = dp->link;
808
809 dp->panel = dp_panel_get(&panel_in);
810 if (IS_ERR(dp->panel)) {
811 rc = PTR_ERR(dp->panel);
812 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
813 dp->panel = NULL;
814 goto error_link;
815 }
816
817 dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
818 dp->power, dp->catalog, dp->parser);
819 if (IS_ERR(dp->ctrl)) {
820 rc = PTR_ERR(dp->ctrl);
821 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
822 dp->ctrl = NULL;
823 goto error_ctrl;
824 }
825
826 dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
827 if (IS_ERR(dp->audio)) {
828 rc = PTR_ERR(dp->audio);
829 pr_err("failed to initialize audio, rc = %d\n", rc);
830 dp->audio = NULL;
831 goto error_ctrl;
832 }
833
834 /* populate wide_bus_en to differernt layers */
835 dp->ctrl->wide_bus_en = dp->wide_bus_en;
836 dp->catalog->wide_bus_en = dp->wide_bus_en;
837
838 return rc;
839
840 error_ctrl:
841 dp_panel_put(dp->panel);
842 error_link:
843 dp_aux_put(dp->aux);
844 error:
845 return rc;
846 }
847
dp_display_set_mode(struct msm_dp * dp_display,struct dp_display_mode * mode)848 static int dp_display_set_mode(struct msm_dp *dp_display,
849 struct dp_display_mode *mode)
850 {
851 struct dp_display_private *dp;
852
853 dp = container_of(dp_display, struct dp_display_private, dp_display);
854
855 dp->panel->dp_mode.drm_mode = mode->drm_mode;
856 dp->panel->dp_mode.bpp = mode->bpp;
857 dp->panel->dp_mode.capabilities = mode->capabilities;
858 dp_panel_init_panel_info(dp->panel);
859 return 0;
860 }
861
dp_display_prepare(struct msm_dp * dp_display)862 static int dp_display_prepare(struct msm_dp *dp_display)
863 {
864 return 0;
865 }
866
dp_display_enable(struct dp_display_private * dp,u32 data)867 static int dp_display_enable(struct dp_display_private *dp, u32 data)
868 {
869 int rc = 0;
870 struct msm_dp *dp_display = &dp->dp_display;
871
872 drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
873 if (dp_display->power_on) {
874 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
875 return 0;
876 }
877
878 rc = dp_ctrl_on_stream(dp->ctrl, data);
879 if (!rc)
880 dp_display->power_on = true;
881
882 return rc;
883 }
884
dp_display_post_enable(struct msm_dp * dp_display)885 static int dp_display_post_enable(struct msm_dp *dp_display)
886 {
887 struct dp_display_private *dp;
888 u32 rate;
889
890 dp = container_of(dp_display, struct dp_display_private, dp_display);
891
892 rate = dp->link->link_params.rate;
893
894 if (dp->audio_supported) {
895 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
896 dp->audio->lane_count = dp->link->link_params.num_lanes;
897 }
898
899 /* signal the connect event late to synchronize video and display */
900 dp_display_handle_plugged_change(dp_display, true);
901 return 0;
902 }
903
dp_display_disable(struct dp_display_private * dp,u32 data)904 static int dp_display_disable(struct dp_display_private *dp, u32 data)
905 {
906 struct msm_dp *dp_display = &dp->dp_display;
907
908 if (!dp_display->power_on)
909 return 0;
910
911 /* wait only if audio was enabled */
912 if (dp_display->audio_enabled) {
913 /* signal the disconnect event */
914 dp_display_handle_plugged_change(dp_display, false);
915 if (!wait_for_completion_timeout(&dp->audio_comp,
916 HZ * 5))
917 DRM_ERROR("audio comp timeout\n");
918 }
919
920 dp_display->audio_enabled = false;
921
922 if (dp->link->sink_count == 0) {
923 /*
924 * irq_hpd with sink_count = 0
925 * hdmi unplugged out of dongle
926 */
927 dp_ctrl_off_link_stream(dp->ctrl);
928 } else {
929 /*
930 * unplugged interrupt
931 * dongle unplugged out of DUT
932 */
933 dp_ctrl_off(dp->ctrl);
934 dp_display_host_phy_exit(dp);
935 }
936
937 dp_display->power_on = false;
938
939 drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
940 return 0;
941 }
942
dp_display_unprepare(struct msm_dp * dp_display)943 static int dp_display_unprepare(struct msm_dp *dp_display)
944 {
945 return 0;
946 }
947
dp_display_set_plugged_cb(struct msm_dp * dp_display,hdmi_codec_plugged_cb fn,struct device * codec_dev)948 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
949 hdmi_codec_plugged_cb fn, struct device *codec_dev)
950 {
951 bool plugged;
952
953 dp_display->plugged_cb = fn;
954 dp_display->codec_dev = codec_dev;
955 plugged = dp_display->is_connected;
956 dp_display_handle_plugged_change(dp_display, plugged);
957
958 return 0;
959 }
960
961 /**
962 * dp_bridge_mode_valid - callback to determine if specified mode is valid
963 * @bridge: Pointer to drm bridge structure
964 * @info: display info
965 * @mode: Pointer to drm mode structure
966 * Returns: Validity status for specified mode
967 */
dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)968 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
969 const struct drm_display_info *info,
970 const struct drm_display_mode *mode)
971 {
972 const u32 num_components = 3, default_bpp = 24;
973 struct dp_display_private *dp_display;
974 struct dp_link_info *link_info;
975 u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
976 struct msm_dp *dp;
977 int mode_pclk_khz = mode->clock;
978
979 dp = to_dp_bridge(bridge)->dp_display;
980
981 if (!dp || !mode_pclk_khz || !dp->connector) {
982 DRM_ERROR("invalid params\n");
983 return -EINVAL;
984 }
985
986 /*
987 * The eDP controller currently does not have a reliable way of
988 * enabling panel power to read sink capabilities. So, we rely
989 * on the panel driver to populate only supported modes for now.
990 */
991 if (dp->is_edp)
992 return MODE_OK;
993
994 if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
995 return MODE_BAD;
996
997 dp_display = container_of(dp, struct dp_display_private, dp_display);
998 link_info = &dp_display->panel->link_info;
999
1000 mode_bpp = dp->connector->display_info.bpc * num_components;
1001 if (!mode_bpp)
1002 mode_bpp = default_bpp;
1003
1004 mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
1005 mode_bpp, mode_pclk_khz);
1006
1007 mode_rate_khz = mode_pclk_khz * mode_bpp;
1008 supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
1009
1010 if (mode_rate_khz > supported_rate_khz)
1011 return MODE_BAD;
1012
1013 return MODE_OK;
1014 }
1015
dp_display_get_modes(struct msm_dp * dp)1016 int dp_display_get_modes(struct msm_dp *dp)
1017 {
1018 struct dp_display_private *dp_display;
1019
1020 if (!dp) {
1021 DRM_ERROR("invalid params\n");
1022 return 0;
1023 }
1024
1025 dp_display = container_of(dp, struct dp_display_private, dp_display);
1026
1027 return dp_panel_get_modes(dp_display->panel,
1028 dp->connector);
1029 }
1030
dp_display_check_video_test(struct msm_dp * dp)1031 bool dp_display_check_video_test(struct msm_dp *dp)
1032 {
1033 struct dp_display_private *dp_display;
1034
1035 dp_display = container_of(dp, struct dp_display_private, dp_display);
1036
1037 return dp_display->panel->video_test;
1038 }
1039
dp_display_get_test_bpp(struct msm_dp * dp)1040 int dp_display_get_test_bpp(struct msm_dp *dp)
1041 {
1042 struct dp_display_private *dp_display;
1043
1044 if (!dp) {
1045 DRM_ERROR("invalid params\n");
1046 return 0;
1047 }
1048
1049 dp_display = container_of(dp, struct dp_display_private, dp_display);
1050
1051 return dp_link_bit_depth_to_bpp(
1052 dp_display->link->test_video.test_bit_depth);
1053 }
1054
msm_dp_snapshot(struct msm_disp_state * disp_state,struct msm_dp * dp)1055 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1056 {
1057 struct dp_display_private *dp_display;
1058
1059 dp_display = container_of(dp, struct dp_display_private, dp_display);
1060
1061 /*
1062 * if we are reading registers we need the link clocks to be on
1063 * however till DP cable is connected this will not happen as we
1064 * do not know the resolution to power up with. Hence check the
1065 * power_on status before dumping DP registers to avoid crash due
1066 * to unclocked access
1067 */
1068 mutex_lock(&dp_display->event_mutex);
1069
1070 if (!dp->power_on) {
1071 mutex_unlock(&dp_display->event_mutex);
1072 return;
1073 }
1074
1075 dp_catalog_snapshot(dp_display->catalog, disp_state);
1076
1077 mutex_unlock(&dp_display->event_mutex);
1078 }
1079
dp_display_config_hpd(struct dp_display_private * dp)1080 static void dp_display_config_hpd(struct dp_display_private *dp)
1081 {
1082
1083 dp_display_host_init(dp);
1084 dp_catalog_ctrl_hpd_config(dp->catalog);
1085
1086 /* Enable plug and unplug interrupts only for external DisplayPort */
1087 if (!dp->dp_display.is_edp)
1088 dp_catalog_hpd_config_intr(dp->catalog,
1089 DP_DP_HPD_PLUG_INT_MASK |
1090 DP_DP_HPD_UNPLUG_INT_MASK,
1091 true);
1092
1093 /* Enable interrupt first time
1094 * we are leaving dp clocks on during disconnect
1095 * and never disable interrupt
1096 */
1097 enable_irq(dp->irq);
1098 }
1099
hpd_event_thread(void * data)1100 static int hpd_event_thread(void *data)
1101 {
1102 struct dp_display_private *dp_priv;
1103 unsigned long flag;
1104 struct dp_event *todo;
1105 int timeout_mode = 0;
1106
1107 dp_priv = (struct dp_display_private *)data;
1108
1109 while (1) {
1110 if (timeout_mode) {
1111 wait_event_timeout(dp_priv->event_q,
1112 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1113 kthread_should_stop(), EVENT_TIMEOUT);
1114 } else {
1115 wait_event_interruptible(dp_priv->event_q,
1116 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1117 kthread_should_stop());
1118 }
1119
1120 if (kthread_should_stop())
1121 break;
1122
1123 spin_lock_irqsave(&dp_priv->event_lock, flag);
1124 todo = &dp_priv->event_list[dp_priv->event_gndx];
1125 if (todo->delay) {
1126 struct dp_event *todo_next;
1127
1128 dp_priv->event_gndx++;
1129 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1130
1131 /* re enter delay event into q */
1132 todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1133 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1134 todo_next->event_id = todo->event_id;
1135 todo_next->data = todo->data;
1136 todo_next->delay = todo->delay - 1;
1137
1138 /* clean up older event */
1139 todo->event_id = EV_NO_EVENT;
1140 todo->delay = 0;
1141
1142 /* switch to timeout mode */
1143 timeout_mode = 1;
1144 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1145 continue;
1146 }
1147
1148 /* timeout with no events in q */
1149 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1150 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1151 continue;
1152 }
1153
1154 dp_priv->event_gndx++;
1155 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1156 timeout_mode = 0;
1157 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1158
1159 switch (todo->event_id) {
1160 case EV_HPD_INIT_SETUP:
1161 dp_display_config_hpd(dp_priv);
1162 break;
1163 case EV_HPD_PLUG_INT:
1164 dp_hpd_plug_handle(dp_priv, todo->data);
1165 break;
1166 case EV_HPD_UNPLUG_INT:
1167 dp_hpd_unplug_handle(dp_priv, todo->data);
1168 break;
1169 case EV_IRQ_HPD_INT:
1170 dp_irq_hpd_handle(dp_priv, todo->data);
1171 break;
1172 case EV_USER_NOTIFICATION:
1173 dp_display_send_hpd_notification(dp_priv,
1174 todo->data);
1175 break;
1176 default:
1177 break;
1178 }
1179 }
1180
1181 return 0;
1182 }
1183
dp_hpd_event_thread_start(struct dp_display_private * dp_priv)1184 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1185 {
1186 /* set event q to empty */
1187 dp_priv->event_gndx = 0;
1188 dp_priv->event_pndx = 0;
1189
1190 dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1191 if (IS_ERR(dp_priv->ev_tsk))
1192 return PTR_ERR(dp_priv->ev_tsk);
1193
1194 return 0;
1195 }
1196
dp_display_irq_handler(int irq,void * dev_id)1197 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1198 {
1199 struct dp_display_private *dp = dev_id;
1200 irqreturn_t ret = IRQ_HANDLED;
1201 u32 hpd_isr_status;
1202
1203 if (!dp) {
1204 DRM_ERROR("invalid data\n");
1205 return IRQ_NONE;
1206 }
1207
1208 hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1209
1210 if (hpd_isr_status & 0x0F) {
1211 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1212 dp->dp_display.connector_type, hpd_isr_status);
1213 /* hpd related interrupts */
1214 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1215 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1216
1217 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1218 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1219 }
1220
1221 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1222 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1223 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1224 }
1225
1226 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1227 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1228 }
1229
1230 /* DP controller isr */
1231 dp_ctrl_isr(dp->ctrl);
1232
1233 /* DP aux isr */
1234 dp_aux_isr(dp->aux);
1235
1236 return ret;
1237 }
1238
dp_display_request_irq(struct msm_dp * dp_display)1239 int dp_display_request_irq(struct msm_dp *dp_display)
1240 {
1241 int rc = 0;
1242 struct dp_display_private *dp;
1243
1244 if (!dp_display) {
1245 DRM_ERROR("invalid input\n");
1246 return -EINVAL;
1247 }
1248
1249 dp = container_of(dp_display, struct dp_display_private, dp_display);
1250
1251 dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1252 if (!dp->irq) {
1253 DRM_ERROR("failed to get irq\n");
1254 return -EINVAL;
1255 }
1256
1257 rc = devm_request_irq(&dp->pdev->dev, dp->irq,
1258 dp_display_irq_handler,
1259 IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1260 if (rc < 0) {
1261 DRM_ERROR("failed to request IRQ%u: %d\n",
1262 dp->irq, rc);
1263 return rc;
1264 }
1265 disable_irq(dp->irq);
1266
1267 return 0;
1268 }
1269
dp_display_get_desc(struct platform_device * pdev,unsigned int * id)1270 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev,
1271 unsigned int *id)
1272 {
1273 const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
1274 struct resource *res;
1275 int i;
1276
1277 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1278 if (!res)
1279 return NULL;
1280
1281 for (i = 0; i < cfg->num_descs; i++) {
1282 if (cfg->descs[i].io_start == res->start) {
1283 *id = i;
1284 return &cfg->descs[i];
1285 }
1286 }
1287
1288 dev_err(&pdev->dev, "unknown displayport instance\n");
1289 return NULL;
1290 }
1291
dp_display_probe(struct platform_device * pdev)1292 static int dp_display_probe(struct platform_device *pdev)
1293 {
1294 int rc = 0;
1295 struct dp_display_private *dp;
1296 const struct msm_dp_desc *desc;
1297
1298 if (!pdev || !pdev->dev.of_node) {
1299 DRM_ERROR("pdev not found\n");
1300 return -ENODEV;
1301 }
1302
1303 dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1304 if (!dp)
1305 return -ENOMEM;
1306
1307 desc = dp_display_get_desc(pdev, &dp->id);
1308 if (!desc)
1309 return -EINVAL;
1310
1311 dp->pdev = pdev;
1312 dp->name = "drm_dp";
1313 dp->dp_display.connector_type = desc->connector_type;
1314 dp->wide_bus_en = desc->wide_bus_en;
1315 dp->dp_display.is_edp =
1316 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1317
1318 rc = dp_init_sub_modules(dp);
1319 if (rc) {
1320 DRM_ERROR("init sub module failed\n");
1321 return -EPROBE_DEFER;
1322 }
1323
1324 /* setup event q */
1325 mutex_init(&dp->event_mutex);
1326 init_waitqueue_head(&dp->event_q);
1327 spin_lock_init(&dp->event_lock);
1328
1329 /* Store DP audio handle inside DP display */
1330 dp->dp_display.dp_audio = dp->audio;
1331
1332 init_completion(&dp->audio_comp);
1333
1334 platform_set_drvdata(pdev, &dp->dp_display);
1335
1336 rc = component_add(&pdev->dev, &dp_display_comp_ops);
1337 if (rc) {
1338 DRM_ERROR("component add failed, rc=%d\n", rc);
1339 dp_display_deinit_sub_modules(dp);
1340 }
1341
1342 return rc;
1343 }
1344
dp_display_remove(struct platform_device * pdev)1345 static int dp_display_remove(struct platform_device *pdev)
1346 {
1347 struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1348
1349 dp_display_deinit_sub_modules(dp);
1350
1351 component_del(&pdev->dev, &dp_display_comp_ops);
1352 platform_set_drvdata(pdev, NULL);
1353
1354 return 0;
1355 }
1356
dp_pm_resume(struct device * dev)1357 static int dp_pm_resume(struct device *dev)
1358 {
1359 struct platform_device *pdev = to_platform_device(dev);
1360 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1361 struct dp_display_private *dp;
1362 int sink_count = 0;
1363
1364 dp = container_of(dp_display, struct dp_display_private, dp_display);
1365
1366 mutex_lock(&dp->event_mutex);
1367
1368 drm_dbg_dp(dp->drm_dev,
1369 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1370 dp->dp_display.connector_type, dp->core_initialized,
1371 dp->phy_initialized, dp_display->power_on);
1372
1373 /* start from disconnected state */
1374 dp->hpd_state = ST_DISCONNECTED;
1375
1376 /* turn on dp ctrl/phy */
1377 dp_display_host_init(dp);
1378
1379 dp_catalog_ctrl_hpd_config(dp->catalog);
1380
1381
1382 if (!dp->dp_display.is_edp)
1383 dp_catalog_hpd_config_intr(dp->catalog,
1384 DP_DP_HPD_PLUG_INT_MASK |
1385 DP_DP_HPD_UNPLUG_INT_MASK,
1386 true);
1387
1388 if (dp_catalog_link_is_connected(dp->catalog)) {
1389 /*
1390 * set sink to normal operation mode -- D0
1391 * before dpcd read
1392 */
1393 dp_display_host_phy_init(dp);
1394 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1395 sink_count = drm_dp_read_sink_count(dp->aux);
1396 if (sink_count < 0)
1397 sink_count = 0;
1398
1399 dp_display_host_phy_exit(dp);
1400 }
1401
1402 dp->link->sink_count = sink_count;
1403 /*
1404 * can not declared display is connected unless
1405 * HDMI cable is plugged in and sink_count of
1406 * dongle become 1
1407 * also only signal audio when disconnected
1408 */
1409 if (dp->link->sink_count) {
1410 dp->dp_display.is_connected = true;
1411 } else {
1412 dp->dp_display.is_connected = false;
1413 dp_display_handle_plugged_change(dp_display, false);
1414 }
1415
1416 drm_dbg_dp(dp->drm_dev,
1417 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1418 dp->dp_display.connector_type, dp->link->sink_count,
1419 dp->dp_display.is_connected, dp->core_initialized,
1420 dp->phy_initialized, dp_display->power_on);
1421
1422 mutex_unlock(&dp->event_mutex);
1423
1424 return 0;
1425 }
1426
dp_pm_suspend(struct device * dev)1427 static int dp_pm_suspend(struct device *dev)
1428 {
1429 struct platform_device *pdev = to_platform_device(dev);
1430 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1431 struct dp_display_private *dp;
1432
1433 dp = container_of(dp_display, struct dp_display_private, dp_display);
1434
1435 mutex_lock(&dp->event_mutex);
1436
1437 drm_dbg_dp(dp->drm_dev,
1438 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1439 dp->dp_display.connector_type, dp->core_initialized,
1440 dp->phy_initialized, dp_display->power_on);
1441
1442 /* mainlink enabled */
1443 if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1444 dp_ctrl_off_link_stream(dp->ctrl);
1445
1446 dp_display_host_phy_exit(dp);
1447
1448 /* host_init will be called at pm_resume */
1449 dp_display_host_deinit(dp);
1450
1451 dp->hpd_state = ST_SUSPENDED;
1452
1453 drm_dbg_dp(dp->drm_dev,
1454 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1455 dp->dp_display.connector_type, dp->core_initialized,
1456 dp->phy_initialized, dp_display->power_on);
1457
1458 mutex_unlock(&dp->event_mutex);
1459
1460 return 0;
1461 }
1462
dp_pm_prepare(struct device * dev)1463 static int dp_pm_prepare(struct device *dev)
1464 {
1465 return 0;
1466 }
1467
dp_pm_complete(struct device * dev)1468 static void dp_pm_complete(struct device *dev)
1469 {
1470
1471 }
1472
1473 static const struct dev_pm_ops dp_pm_ops = {
1474 .suspend = dp_pm_suspend,
1475 .resume = dp_pm_resume,
1476 .prepare = dp_pm_prepare,
1477 .complete = dp_pm_complete,
1478 };
1479
1480 static struct platform_driver dp_display_driver = {
1481 .probe = dp_display_probe,
1482 .remove = dp_display_remove,
1483 .driver = {
1484 .name = "msm-dp-display",
1485 .of_match_table = dp_dt_match,
1486 .suppress_bind_attrs = true,
1487 .pm = &dp_pm_ops,
1488 },
1489 };
1490
msm_dp_register(void)1491 int __init msm_dp_register(void)
1492 {
1493 int ret;
1494
1495 ret = platform_driver_register(&dp_display_driver);
1496 if (ret)
1497 DRM_ERROR("Dp display driver register failed");
1498
1499 return ret;
1500 }
1501
msm_dp_unregister(void)1502 void __exit msm_dp_unregister(void)
1503 {
1504 platform_driver_unregister(&dp_display_driver);
1505 }
1506
msm_dp_irq_postinstall(struct msm_dp * dp_display)1507 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1508 {
1509 struct dp_display_private *dp;
1510
1511 if (!dp_display)
1512 return;
1513
1514 dp = container_of(dp_display, struct dp_display_private, dp_display);
1515
1516 if (!dp_display->is_edp)
1517 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
1518 }
1519
msm_dp_wide_bus_available(const struct msm_dp * dp_display)1520 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1521 {
1522 struct dp_display_private *dp;
1523
1524 dp = container_of(dp_display, struct dp_display_private, dp_display);
1525
1526 return dp->wide_bus_en;
1527 }
1528
msm_dp_debugfs_init(struct msm_dp * dp_display,struct drm_minor * minor)1529 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1530 {
1531 struct dp_display_private *dp;
1532 struct device *dev;
1533 int rc;
1534
1535 dp = container_of(dp_display, struct dp_display_private, dp_display);
1536 dev = &dp->pdev->dev;
1537
1538 dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
1539 dp->link, dp->dp_display.connector,
1540 minor);
1541 if (IS_ERR(dp->debug)) {
1542 rc = PTR_ERR(dp->debug);
1543 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1544 dp->debug = NULL;
1545 }
1546 }
1547
dp_display_get_next_bridge(struct msm_dp * dp)1548 static int dp_display_get_next_bridge(struct msm_dp *dp)
1549 {
1550 int rc;
1551 struct dp_display_private *dp_priv;
1552 struct device_node *aux_bus;
1553 struct device *dev;
1554
1555 dp_priv = container_of(dp, struct dp_display_private, dp_display);
1556 dev = &dp_priv->pdev->dev;
1557 aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1558
1559 if (aux_bus && dp->is_edp) {
1560 dp_display_host_init(dp_priv);
1561 dp_catalog_ctrl_hpd_config(dp_priv->catalog);
1562 dp_display_host_phy_init(dp_priv);
1563 enable_irq(dp_priv->irq);
1564
1565 /*
1566 * The code below assumes that the panel will finish probing
1567 * by the time devm_of_dp_aux_populate_ep_devices() returns.
1568 * This isn't a great assumption since it will fail if the
1569 * panel driver is probed asynchronously but is the best we
1570 * can do without a bigger driver reorganization.
1571 */
1572 rc = devm_of_dp_aux_populate_ep_devices(dp_priv->aux);
1573 of_node_put(aux_bus);
1574 if (rc)
1575 goto error;
1576 } else if (dp->is_edp) {
1577 DRM_ERROR("eDP aux_bus not found\n");
1578 return -ENODEV;
1579 }
1580
1581 /*
1582 * External bridges are mandatory for eDP interfaces: one has to
1583 * provide at least an eDP panel (which gets wrapped into panel-bridge).
1584 *
1585 * For DisplayPort interfaces external bridges are optional, so
1586 * silently ignore an error if one is not present (-ENODEV).
1587 */
1588 rc = dp_parser_find_next_bridge(dp_priv->parser);
1589 if (!dp->is_edp && rc == -ENODEV)
1590 return 0;
1591
1592 if (!rc) {
1593 dp->next_bridge = dp_priv->parser->next_bridge;
1594 return 0;
1595 }
1596
1597 error:
1598 if (dp->is_edp) {
1599 disable_irq(dp_priv->irq);
1600 dp_display_host_phy_exit(dp_priv);
1601 dp_display_host_deinit(dp_priv);
1602 }
1603 return rc;
1604 }
1605
msm_dp_modeset_init(struct msm_dp * dp_display,struct drm_device * dev,struct drm_encoder * encoder)1606 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1607 struct drm_encoder *encoder)
1608 {
1609 struct msm_drm_private *priv;
1610 struct dp_display_private *dp_priv;
1611 int ret;
1612
1613 if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
1614 return -EINVAL;
1615
1616 priv = dev->dev_private;
1617 dp_display->drm_dev = dev;
1618
1619 dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1620
1621 ret = dp_display_request_irq(dp_display);
1622 if (ret) {
1623 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1624 return ret;
1625 }
1626
1627 dp_display->encoder = encoder;
1628
1629 ret = dp_display_get_next_bridge(dp_display);
1630 if (ret)
1631 return ret;
1632
1633 dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1634 if (IS_ERR(dp_display->bridge)) {
1635 ret = PTR_ERR(dp_display->bridge);
1636 DRM_DEV_ERROR(dev->dev,
1637 "failed to create dp bridge: %d\n", ret);
1638 dp_display->bridge = NULL;
1639 return ret;
1640 }
1641
1642 priv->bridges[priv->num_bridges++] = dp_display->bridge;
1643
1644 dp_display->connector = dp_drm_connector_init(dp_display);
1645 if (IS_ERR(dp_display->connector)) {
1646 ret = PTR_ERR(dp_display->connector);
1647 DRM_DEV_ERROR(dev->dev,
1648 "failed to create dp connector: %d\n", ret);
1649 dp_display->connector = NULL;
1650 return ret;
1651 }
1652
1653 dp_priv->panel->connector = dp_display->connector;
1654
1655 return 0;
1656 }
1657
dp_bridge_enable(struct drm_bridge * drm_bridge)1658 void dp_bridge_enable(struct drm_bridge *drm_bridge)
1659 {
1660 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1661 struct msm_dp *dp = dp_bridge->dp_display;
1662 int rc = 0;
1663 struct dp_display_private *dp_display;
1664 u32 state;
1665 bool force_link_train = false;
1666
1667 dp_display = container_of(dp, struct dp_display_private, dp_display);
1668 if (!dp_display->dp_mode.drm_mode.clock) {
1669 DRM_ERROR("invalid params\n");
1670 return;
1671 }
1672
1673 if (dp->is_edp)
1674 dp_hpd_plug_handle(dp_display, 0);
1675
1676 mutex_lock(&dp_display->event_mutex);
1677
1678 state = dp_display->hpd_state;
1679 if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1680 mutex_unlock(&dp_display->event_mutex);
1681 return;
1682 }
1683
1684 rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1685 if (rc) {
1686 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1687 mutex_unlock(&dp_display->event_mutex);
1688 return;
1689 }
1690
1691 rc = dp_display_prepare(dp);
1692 if (rc) {
1693 DRM_ERROR("DP display prepare failed, rc=%d\n", rc);
1694 mutex_unlock(&dp_display->event_mutex);
1695 return;
1696 }
1697
1698 state = dp_display->hpd_state;
1699
1700 if (state == ST_DISPLAY_OFF) {
1701 dp_display_host_phy_init(dp_display);
1702 force_link_train = true;
1703 }
1704
1705 dp_display_enable(dp_display, force_link_train);
1706
1707 rc = dp_display_post_enable(dp);
1708 if (rc) {
1709 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1710 dp_display_disable(dp_display, 0);
1711 dp_display_unprepare(dp);
1712 }
1713
1714 /* completed connection */
1715 dp_display->hpd_state = ST_CONNECTED;
1716
1717 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1718 mutex_unlock(&dp_display->event_mutex);
1719 }
1720
dp_bridge_disable(struct drm_bridge * drm_bridge)1721 void dp_bridge_disable(struct drm_bridge *drm_bridge)
1722 {
1723 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1724 struct msm_dp *dp = dp_bridge->dp_display;
1725 struct dp_display_private *dp_display;
1726
1727 dp_display = container_of(dp, struct dp_display_private, dp_display);
1728
1729 dp_ctrl_push_idle(dp_display->ctrl);
1730 }
1731
dp_bridge_post_disable(struct drm_bridge * drm_bridge)1732 void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
1733 {
1734 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1735 struct msm_dp *dp = dp_bridge->dp_display;
1736 int rc = 0;
1737 u32 state;
1738 struct dp_display_private *dp_display;
1739
1740 dp_display = container_of(dp, struct dp_display_private, dp_display);
1741
1742 if (dp->is_edp)
1743 dp_hpd_unplug_handle(dp_display, 0);
1744
1745 mutex_lock(&dp_display->event_mutex);
1746
1747 state = dp_display->hpd_state;
1748 if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1749 mutex_unlock(&dp_display->event_mutex);
1750 return;
1751 }
1752
1753 dp_display_disable(dp_display, 0);
1754
1755 rc = dp_display_unprepare(dp);
1756 if (rc)
1757 DRM_ERROR("DP display unprepare failed, rc=%d\n", rc);
1758
1759 state = dp_display->hpd_state;
1760 if (state == ST_DISCONNECT_PENDING) {
1761 /* completed disconnection */
1762 dp_display->hpd_state = ST_DISCONNECTED;
1763 } else {
1764 dp_display->hpd_state = ST_DISPLAY_OFF;
1765 }
1766
1767 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1768 mutex_unlock(&dp_display->event_mutex);
1769 }
1770
dp_bridge_mode_set(struct drm_bridge * drm_bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)1771 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1772 const struct drm_display_mode *mode,
1773 const struct drm_display_mode *adjusted_mode)
1774 {
1775 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1776 struct msm_dp *dp = dp_bridge->dp_display;
1777 struct dp_display_private *dp_display;
1778
1779 dp_display = container_of(dp, struct dp_display_private, dp_display);
1780
1781 memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1782
1783 if (dp_display_check_video_test(dp))
1784 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1785 else /* Default num_components per pixel = 3 */
1786 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1787
1788 if (!dp_display->dp_mode.bpp)
1789 dp_display->dp_mode.bpp = 24; /* Default bpp */
1790
1791 drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1792
1793 dp_display->dp_mode.v_active_low =
1794 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1795
1796 dp_display->dp_mode.h_active_low =
1797 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1798 }
1799