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_parser.h"
18 #include "dp_power.h"
19 #include "dp_catalog.h"
20 #include "dp_aux.h"
21 #include "dp_reg.h"
22 #include "dp_link.h"
23 #include "dp_panel.h"
24 #include "dp_ctrl.h"
25 #include "dp_display.h"
26 #include "dp_drm.h"
27 #include "dp_audio.h"
28 #include "dp_debug.h"
29
30 static bool psr_enabled = false;
31 module_param(psr_enabled, bool, 0);
32 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
33
34 #define HPD_STRING_SIZE 30
35
36 enum {
37 ISR_DISCONNECTED,
38 ISR_CONNECT_PENDING,
39 ISR_CONNECTED,
40 ISR_HPD_REPLUG_COUNT,
41 ISR_IRQ_HPD_PULSE_COUNT,
42 ISR_HPD_LO_GLITH_COUNT,
43 };
44
45 /* event thread connection state */
46 enum {
47 ST_DISCONNECTED,
48 ST_MAINLINK_READY,
49 ST_CONNECTED,
50 ST_DISCONNECT_PENDING,
51 ST_DISPLAY_OFF,
52 ST_SUSPENDED,
53 };
54
55 enum {
56 EV_NO_EVENT,
57 /* hpd events */
58 EV_HPD_INIT_SETUP,
59 EV_HPD_PLUG_INT,
60 EV_IRQ_HPD_INT,
61 EV_HPD_UNPLUG_INT,
62 EV_USER_NOTIFICATION,
63 };
64
65 #define EVENT_TIMEOUT (HZ/10) /* 100ms */
66 #define DP_EVENT_Q_MAX 8
67
68 #define DP_TIMEOUT_NONE 0
69
70 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
71
72 struct dp_event {
73 u32 event_id;
74 u32 data;
75 u32 delay;
76 };
77
78 struct dp_display_private {
79 char *name;
80 int irq;
81
82 unsigned int id;
83
84 /* state variables */
85 bool core_initialized;
86 bool phy_initialized;
87 bool hpd_irq_on;
88 bool audio_supported;
89
90 struct drm_device *drm_dev;
91 struct platform_device *pdev;
92 struct dentry *root;
93
94 struct dp_parser *parser;
95 struct dp_power *power;
96 struct dp_catalog *catalog;
97 struct drm_dp_aux *aux;
98 struct dp_link *link;
99 struct dp_panel *panel;
100 struct dp_ctrl *ctrl;
101 struct dp_debug *debug;
102
103 struct dp_display_mode dp_mode;
104 struct msm_dp dp_display;
105
106 /* wait for audio signaling */
107 struct completion audio_comp;
108
109 /* event related only access by event thread */
110 struct mutex event_mutex;
111 wait_queue_head_t event_q;
112 u32 hpd_state;
113 u32 event_pndx;
114 u32 event_gndx;
115 struct task_struct *ev_tsk;
116 struct dp_event event_list[DP_EVENT_Q_MAX];
117 spinlock_t event_lock;
118
119 bool wide_bus_en;
120
121 struct dp_audio *audio;
122 };
123
124 struct msm_dp_desc {
125 phys_addr_t io_start;
126 unsigned int id;
127 unsigned int connector_type;
128 bool wide_bus_en;
129 };
130
131 static const struct msm_dp_desc sc7180_dp_descs[] = {
132 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
133 {}
134 };
135
136 static const struct msm_dp_desc sc7280_dp_descs[] = {
137 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
138 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
139 {}
140 };
141
142 static const struct msm_dp_desc sc8180x_dp_descs[] = {
143 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
144 { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
145 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
146 {}
147 };
148
149 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
150 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
151 { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
152 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
153 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
154 { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
155 { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
156 { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
157 { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
158 {}
159 };
160
161 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
162 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
163 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
164 { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
165 { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
166 {}
167 };
168
169 static const struct msm_dp_desc sm8350_dp_descs[] = {
170 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
171 {}
172 };
173
174 static const struct msm_dp_desc sm8650_dp_descs[] = {
175 { .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
176 {}
177 };
178
179 static const struct of_device_id dp_dt_match[] = {
180 { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
181 { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
182 { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
183 { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
184 { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
185 { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
186 { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
187 { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
188 { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
189 { .compatible = "qcom,sm8650-dp", .data = &sm8650_dp_descs },
190 {}
191 };
192
dev_get_dp_display_private(struct device * dev)193 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
194 {
195 struct msm_dp *dp = dev_get_drvdata(dev);
196
197 return container_of(dp, struct dp_display_private, dp_display);
198 }
199
dp_add_event(struct dp_display_private * dp_priv,u32 event,u32 data,u32 delay)200 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
201 u32 data, u32 delay)
202 {
203 unsigned long flag;
204 struct dp_event *todo;
205 int pndx;
206
207 spin_lock_irqsave(&dp_priv->event_lock, flag);
208 pndx = dp_priv->event_pndx + 1;
209 pndx %= DP_EVENT_Q_MAX;
210 if (pndx == dp_priv->event_gndx) {
211 pr_err("event_q is full: pndx=%d gndx=%d\n",
212 dp_priv->event_pndx, dp_priv->event_gndx);
213 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
214 return -EPERM;
215 }
216 todo = &dp_priv->event_list[dp_priv->event_pndx++];
217 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
218 todo->event_id = event;
219 todo->data = data;
220 todo->delay = delay;
221 wake_up(&dp_priv->event_q);
222 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
223
224 return 0;
225 }
226
dp_del_event(struct dp_display_private * dp_priv,u32 event)227 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
228 {
229 unsigned long flag;
230 struct dp_event *todo;
231 u32 gndx;
232
233 spin_lock_irqsave(&dp_priv->event_lock, flag);
234 if (dp_priv->event_pndx == dp_priv->event_gndx) {
235 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
236 return -ENOENT;
237 }
238
239 gndx = dp_priv->event_gndx;
240 while (dp_priv->event_pndx != gndx) {
241 todo = &dp_priv->event_list[gndx];
242 if (todo->event_id == event) {
243 todo->event_id = EV_NO_EVENT; /* deleted */
244 todo->delay = 0;
245 }
246 gndx++;
247 gndx %= DP_EVENT_Q_MAX;
248 }
249 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
250
251 return 0;
252 }
253
dp_display_signal_audio_start(struct msm_dp * dp_display)254 void dp_display_signal_audio_start(struct msm_dp *dp_display)
255 {
256 struct dp_display_private *dp;
257
258 dp = container_of(dp_display, struct dp_display_private, dp_display);
259
260 reinit_completion(&dp->audio_comp);
261 }
262
dp_display_signal_audio_complete(struct msm_dp * dp_display)263 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
264 {
265 struct dp_display_private *dp;
266
267 dp = container_of(dp_display, struct dp_display_private, dp_display);
268
269 complete_all(&dp->audio_comp);
270 }
271
272 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
273
dp_display_bind(struct device * dev,struct device * master,void * data)274 static int dp_display_bind(struct device *dev, struct device *master,
275 void *data)
276 {
277 int rc = 0;
278 struct dp_display_private *dp = dev_get_dp_display_private(dev);
279 struct msm_drm_private *priv = dev_get_drvdata(master);
280 struct drm_device *drm = priv->dev;
281
282 dp->dp_display.drm_dev = drm;
283 priv->dp[dp->id] = &dp->dp_display;
284
285 rc = dp->parser->parse(dp->parser);
286 if (rc) {
287 DRM_ERROR("device tree parsing failed\n");
288 goto end;
289 }
290
291
292 dp->drm_dev = drm;
293 dp->aux->drm_dev = drm;
294 rc = dp_aux_register(dp->aux);
295 if (rc) {
296 DRM_ERROR("DRM DP AUX register failed\n");
297 goto end;
298 }
299
300 rc = dp_power_client_init(dp->power);
301 if (rc) {
302 DRM_ERROR("Power client create failed\n");
303 goto end;
304 }
305
306 rc = dp_register_audio_driver(dev, dp->audio);
307 if (rc) {
308 DRM_ERROR("Audio registration Dp failed\n");
309 goto end;
310 }
311
312 rc = dp_hpd_event_thread_start(dp);
313 if (rc) {
314 DRM_ERROR("Event thread create failed\n");
315 goto end;
316 }
317
318 return 0;
319 end:
320 return rc;
321 }
322
dp_display_unbind(struct device * dev,struct device * master,void * data)323 static void dp_display_unbind(struct device *dev, struct device *master,
324 void *data)
325 {
326 struct dp_display_private *dp = dev_get_dp_display_private(dev);
327 struct msm_drm_private *priv = dev_get_drvdata(master);
328
329 /* disable all HPD interrupts */
330 if (dp->core_initialized)
331 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
332
333 kthread_stop(dp->ev_tsk);
334
335 of_dp_aux_depopulate_bus(dp->aux);
336
337 dp_power_client_deinit(dp->power);
338 dp_unregister_audio_driver(dev, dp->audio);
339 dp_aux_unregister(dp->aux);
340 dp->drm_dev = NULL;
341 dp->aux->drm_dev = NULL;
342 priv->dp[dp->id] = NULL;
343 }
344
345 static const struct component_ops dp_display_comp_ops = {
346 .bind = dp_display_bind,
347 .unbind = dp_display_unbind,
348 };
349
dp_display_is_ds_bridge(struct dp_panel * panel)350 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
351 {
352 return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
353 DP_DWN_STRM_PORT_PRESENT);
354 }
355
dp_display_is_sink_count_zero(struct dp_display_private * dp)356 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
357 {
358 drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
359 dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
360 dp->link->sink_count);
361 return dp_display_is_ds_bridge(dp->panel) &&
362 (dp->link->sink_count == 0);
363 }
364
dp_display_send_hpd_event(struct msm_dp * dp_display)365 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
366 {
367 struct dp_display_private *dp;
368 struct drm_connector *connector;
369
370 dp = container_of(dp_display, struct dp_display_private, dp_display);
371
372 connector = dp->dp_display.connector;
373 drm_helper_hpd_irq_event(connector->dev);
374 }
375
376
dp_display_send_hpd_notification(struct dp_display_private * dp,bool hpd)377 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
378 bool hpd)
379 {
380 if ((hpd && dp->dp_display.is_connected) ||
381 (!hpd && !dp->dp_display.is_connected)) {
382 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
383 (hpd ? "on" : "off"));
384 return 0;
385 }
386
387 /* reset video pattern flag on disconnect */
388 if (!hpd)
389 dp->panel->video_test = false;
390
391 dp->dp_display.is_connected = hpd;
392
393 drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
394 dp->dp_display.connector_type, hpd);
395 dp_display_send_hpd_event(&dp->dp_display);
396
397 return 0;
398 }
399
dp_display_process_hpd_high(struct dp_display_private * dp)400 static int dp_display_process_hpd_high(struct dp_display_private *dp)
401 {
402 int rc = 0;
403 struct edid *edid;
404
405 dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
406 dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
407
408 drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
409 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
410
411 rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
412 if (rc)
413 goto end;
414
415 dp_link_process_request(dp->link);
416
417 edid = dp->panel->edid;
418
419 dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
420
421 dp->audio_supported = drm_detect_monitor_audio(edid);
422 dp_panel_handle_sink_request(dp->panel);
423
424 dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
425
426 /*
427 * set sink to normal operation mode -- D0
428 * before dpcd read
429 */
430 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
431
432 dp_link_reset_phy_params_vx_px(dp->link);
433 rc = dp_ctrl_on_link(dp->ctrl);
434 if (rc) {
435 DRM_ERROR("failed to complete DP link training\n");
436 goto end;
437 }
438
439 dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
440
441 end:
442 return rc;
443 }
444
dp_display_host_phy_init(struct dp_display_private * dp)445 static void dp_display_host_phy_init(struct dp_display_private *dp)
446 {
447 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
448 dp->dp_display.connector_type, dp->core_initialized,
449 dp->phy_initialized);
450
451 if (!dp->phy_initialized) {
452 dp_ctrl_phy_init(dp->ctrl);
453 dp->phy_initialized = true;
454 }
455 }
456
dp_display_host_phy_exit(struct dp_display_private * dp)457 static void dp_display_host_phy_exit(struct dp_display_private *dp)
458 {
459 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
460 dp->dp_display.connector_type, dp->core_initialized,
461 dp->phy_initialized);
462
463 if (dp->phy_initialized) {
464 dp_ctrl_phy_exit(dp->ctrl);
465 dp->phy_initialized = false;
466 }
467 }
468
dp_display_host_init(struct dp_display_private * dp)469 static void dp_display_host_init(struct dp_display_private *dp)
470 {
471 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
472 dp->dp_display.connector_type, dp->core_initialized,
473 dp->phy_initialized);
474
475 dp_power_init(dp->power);
476 dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
477 dp_aux_init(dp->aux);
478 dp->core_initialized = true;
479 }
480
dp_display_host_deinit(struct dp_display_private * dp)481 static void dp_display_host_deinit(struct dp_display_private *dp)
482 {
483 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
484 dp->dp_display.connector_type, dp->core_initialized,
485 dp->phy_initialized);
486
487 dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
488 dp_aux_deinit(dp->aux);
489 dp_power_deinit(dp->power);
490 dp->core_initialized = false;
491 }
492
dp_display_usbpd_configure_cb(struct device * dev)493 static int dp_display_usbpd_configure_cb(struct device *dev)
494 {
495 struct dp_display_private *dp = dev_get_dp_display_private(dev);
496
497 dp_display_host_phy_init(dp);
498
499 return dp_display_process_hpd_high(dp);
500 }
501
dp_display_notify_disconnect(struct device * dev)502 static int dp_display_notify_disconnect(struct device *dev)
503 {
504 struct dp_display_private *dp = dev_get_dp_display_private(dev);
505
506 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
507
508 return 0;
509 }
510
dp_display_handle_video_request(struct dp_display_private * dp)511 static void dp_display_handle_video_request(struct dp_display_private *dp)
512 {
513 if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
514 dp->panel->video_test = true;
515 dp_link_send_test_response(dp->link);
516 }
517 }
518
dp_display_handle_port_ststus_changed(struct dp_display_private * dp)519 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
520 {
521 int rc = 0;
522
523 if (dp_display_is_sink_count_zero(dp)) {
524 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
525 if (dp->hpd_state != ST_DISCONNECTED) {
526 dp->hpd_state = ST_DISCONNECT_PENDING;
527 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
528 }
529 } else {
530 if (dp->hpd_state == ST_DISCONNECTED) {
531 dp->hpd_state = ST_MAINLINK_READY;
532 rc = dp_display_process_hpd_high(dp);
533 if (rc)
534 dp->hpd_state = ST_DISCONNECTED;
535 }
536 }
537
538 return rc;
539 }
540
dp_display_handle_irq_hpd(struct dp_display_private * dp)541 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
542 {
543 u32 sink_request = dp->link->sink_request;
544
545 drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
546 if (dp->hpd_state == ST_DISCONNECTED) {
547 if (sink_request & DP_LINK_STATUS_UPDATED) {
548 drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
549 sink_request);
550 DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
551 return -EINVAL;
552 }
553 }
554
555 dp_ctrl_handle_sink_request(dp->ctrl);
556
557 if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
558 dp_display_handle_video_request(dp);
559
560 return 0;
561 }
562
dp_display_usbpd_attention_cb(struct device * dev)563 static int dp_display_usbpd_attention_cb(struct device *dev)
564 {
565 int rc = 0;
566 u32 sink_request;
567 struct dp_display_private *dp = dev_get_dp_display_private(dev);
568
569 /* check for any test request issued by sink */
570 rc = dp_link_process_request(dp->link);
571 if (!rc) {
572 sink_request = dp->link->sink_request;
573 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
574 dp->hpd_state, sink_request);
575 if (sink_request & DS_PORT_STATUS_CHANGED)
576 rc = dp_display_handle_port_ststus_changed(dp);
577 else
578 rc = dp_display_handle_irq_hpd(dp);
579 }
580
581 return rc;
582 }
583
dp_hpd_plug_handle(struct dp_display_private * dp,u32 data)584 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
585 {
586 u32 state;
587 int ret;
588
589 dp_aux_enable_xfers(dp->aux, true);
590
591 mutex_lock(&dp->event_mutex);
592
593 state = dp->hpd_state;
594 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
595 dp->dp_display.connector_type, state);
596
597 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
598 mutex_unlock(&dp->event_mutex);
599 return 0;
600 }
601
602 if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
603 mutex_unlock(&dp->event_mutex);
604 return 0;
605 }
606
607 if (state == ST_DISCONNECT_PENDING) {
608 /* wait until ST_DISCONNECTED */
609 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
610 mutex_unlock(&dp->event_mutex);
611 return 0;
612 }
613
614 ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
615 if (ret) { /* link train failed */
616 dp->hpd_state = ST_DISCONNECTED;
617 } else {
618 dp->hpd_state = ST_MAINLINK_READY;
619 }
620
621 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
622 dp->dp_display.connector_type, state);
623 mutex_unlock(&dp->event_mutex);
624
625 /* uevent will complete connection part */
626 return 0;
627 };
628
dp_display_handle_plugged_change(struct msm_dp * dp_display,bool plugged)629 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
630 bool plugged)
631 {
632 struct dp_display_private *dp;
633
634 dp = container_of(dp_display,
635 struct dp_display_private, dp_display);
636
637 /* notify audio subsystem only if sink supports audio */
638 if (dp_display->plugged_cb && dp_display->codec_dev &&
639 dp->audio_supported)
640 dp_display->plugged_cb(dp_display->codec_dev, plugged);
641 }
642
dp_hpd_unplug_handle(struct dp_display_private * dp,u32 data)643 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
644 {
645 u32 state;
646
647 dp_aux_enable_xfers(dp->aux, false);
648
649 mutex_lock(&dp->event_mutex);
650
651 state = dp->hpd_state;
652
653 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
654 dp->dp_display.connector_type, state);
655
656 /* unplugged, no more irq_hpd handle */
657 dp_del_event(dp, EV_IRQ_HPD_INT);
658
659 if (state == ST_DISCONNECTED) {
660 /* triggered by irq_hdp with sink_count = 0 */
661 if (dp->link->sink_count == 0) {
662 dp_display_host_phy_exit(dp);
663 }
664 dp_display_notify_disconnect(&dp->pdev->dev);
665 mutex_unlock(&dp->event_mutex);
666 return 0;
667 } else if (state == ST_DISCONNECT_PENDING) {
668 mutex_unlock(&dp->event_mutex);
669 return 0;
670 } else if (state == ST_MAINLINK_READY) {
671 dp_ctrl_off_link(dp->ctrl);
672 dp_display_host_phy_exit(dp);
673 dp->hpd_state = ST_DISCONNECTED;
674 dp_display_notify_disconnect(&dp->pdev->dev);
675 mutex_unlock(&dp->event_mutex);
676 return 0;
677 }
678
679 /*
680 * We don't need separate work for disconnect as
681 * connect/attention interrupts are disabled
682 */
683 dp_display_notify_disconnect(&dp->pdev->dev);
684
685 if (state == ST_DISPLAY_OFF) {
686 dp->hpd_state = ST_DISCONNECTED;
687 } else {
688 dp->hpd_state = ST_DISCONNECT_PENDING;
689 }
690
691 /* signal the disconnect event early to ensure proper teardown */
692 dp_display_handle_plugged_change(&dp->dp_display, false);
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_panel_in panel_in = {
748 .dev = dev,
749 };
750
751 dp->parser = dp_parser_get(dp->pdev);
752 if (IS_ERR(dp->parser)) {
753 rc = PTR_ERR(dp->parser);
754 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
755 dp->parser = NULL;
756 goto error;
757 }
758
759 dp->catalog = dp_catalog_get(dev, &dp->parser->io);
760 if (IS_ERR(dp->catalog)) {
761 rc = PTR_ERR(dp->catalog);
762 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
763 dp->catalog = NULL;
764 goto error;
765 }
766
767 dp->power = dp_power_get(dev, dp->parser);
768 if (IS_ERR(dp->power)) {
769 rc = PTR_ERR(dp->power);
770 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
771 dp->power = NULL;
772 goto error;
773 }
774
775 dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
776 if (IS_ERR(dp->aux)) {
777 rc = PTR_ERR(dp->aux);
778 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
779 dp->aux = NULL;
780 goto error;
781 }
782
783 dp->link = dp_link_get(dev, dp->aux);
784 if (IS_ERR(dp->link)) {
785 rc = PTR_ERR(dp->link);
786 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
787 dp->link = NULL;
788 goto error_link;
789 }
790
791 panel_in.aux = dp->aux;
792 panel_in.catalog = dp->catalog;
793 panel_in.link = dp->link;
794
795 dp->panel = dp_panel_get(&panel_in);
796 if (IS_ERR(dp->panel)) {
797 rc = PTR_ERR(dp->panel);
798 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
799 dp->panel = NULL;
800 goto error_link;
801 }
802
803 dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
804 dp->power, dp->catalog, dp->parser);
805 if (IS_ERR(dp->ctrl)) {
806 rc = PTR_ERR(dp->ctrl);
807 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
808 dp->ctrl = NULL;
809 goto error_ctrl;
810 }
811
812 dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
813 if (IS_ERR(dp->audio)) {
814 rc = PTR_ERR(dp->audio);
815 pr_err("failed to initialize audio, rc = %d\n", rc);
816 dp->audio = NULL;
817 goto error_ctrl;
818 }
819
820 /* populate wide_bus_en to differernt layers */
821 dp->ctrl->wide_bus_en = dp->wide_bus_en;
822 dp->catalog->wide_bus_en = dp->wide_bus_en;
823
824 return rc;
825
826 error_ctrl:
827 dp_panel_put(dp->panel);
828 error_link:
829 dp_aux_put(dp->aux);
830 error:
831 return rc;
832 }
833
dp_display_set_mode(struct msm_dp * dp_display,struct dp_display_mode * mode)834 static int dp_display_set_mode(struct msm_dp *dp_display,
835 struct dp_display_mode *mode)
836 {
837 struct dp_display_private *dp;
838
839 dp = container_of(dp_display, struct dp_display_private, dp_display);
840
841 drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
842 dp->panel->dp_mode.bpp = mode->bpp;
843 dp->panel->dp_mode.capabilities = mode->capabilities;
844 dp_panel_init_panel_info(dp->panel);
845 return 0;
846 }
847
dp_display_enable(struct dp_display_private * dp,bool force_link_train)848 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
849 {
850 int rc = 0;
851 struct msm_dp *dp_display = &dp->dp_display;
852
853 drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
854 if (dp_display->power_on) {
855 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
856 return 0;
857 }
858
859 rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
860 if (!rc)
861 dp_display->power_on = true;
862
863 return rc;
864 }
865
dp_display_post_enable(struct msm_dp * dp_display)866 static int dp_display_post_enable(struct msm_dp *dp_display)
867 {
868 struct dp_display_private *dp;
869 u32 rate;
870
871 dp = container_of(dp_display, struct dp_display_private, dp_display);
872
873 rate = dp->link->link_params.rate;
874
875 if (dp->audio_supported) {
876 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
877 dp->audio->lane_count = dp->link->link_params.num_lanes;
878 }
879
880 /* signal the connect event late to synchronize video and display */
881 dp_display_handle_plugged_change(dp_display, true);
882
883 if (dp_display->psr_supported)
884 dp_ctrl_config_psr(dp->ctrl);
885
886 return 0;
887 }
888
dp_display_disable(struct dp_display_private * dp)889 static int dp_display_disable(struct dp_display_private *dp)
890 {
891 struct msm_dp *dp_display = &dp->dp_display;
892
893 if (!dp_display->power_on)
894 return 0;
895
896 /* wait only if audio was enabled */
897 if (dp_display->audio_enabled) {
898 /* signal the disconnect event */
899 dp_display_handle_plugged_change(dp_display, false);
900 if (!wait_for_completion_timeout(&dp->audio_comp,
901 HZ * 5))
902 DRM_ERROR("audio comp timeout\n");
903 }
904
905 dp_display->audio_enabled = false;
906
907 if (dp->link->sink_count == 0) {
908 /*
909 * irq_hpd with sink_count = 0
910 * hdmi unplugged out of dongle
911 */
912 dp_ctrl_off_link_stream(dp->ctrl);
913 } else {
914 /*
915 * unplugged interrupt
916 * dongle unplugged out of DUT
917 */
918 dp_ctrl_off(dp->ctrl);
919 dp_display_host_phy_exit(dp);
920 }
921
922 dp_display->power_on = false;
923
924 drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
925 return 0;
926 }
927
dp_display_set_plugged_cb(struct msm_dp * dp_display,hdmi_codec_plugged_cb fn,struct device * codec_dev)928 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
929 hdmi_codec_plugged_cb fn, struct device *codec_dev)
930 {
931 bool plugged;
932
933 dp_display->plugged_cb = fn;
934 dp_display->codec_dev = codec_dev;
935 plugged = dp_display->is_connected;
936 dp_display_handle_plugged_change(dp_display, plugged);
937
938 return 0;
939 }
940
941 /**
942 * dp_bridge_mode_valid - callback to determine if specified mode is valid
943 * @bridge: Pointer to drm bridge structure
944 * @info: display info
945 * @mode: Pointer to drm mode structure
946 * Returns: Validity status for specified mode
947 */
dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)948 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
949 const struct drm_display_info *info,
950 const struct drm_display_mode *mode)
951 {
952 const u32 num_components = 3, default_bpp = 24;
953 struct dp_display_private *dp_display;
954 struct dp_link_info *link_info;
955 u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
956 struct msm_dp *dp;
957 int mode_pclk_khz = mode->clock;
958
959 dp = to_dp_bridge(bridge)->dp_display;
960
961 if (!dp || !mode_pclk_khz || !dp->connector) {
962 DRM_ERROR("invalid params\n");
963 return -EINVAL;
964 }
965
966 if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
967 return MODE_CLOCK_HIGH;
968
969 dp_display = container_of(dp, struct dp_display_private, dp_display);
970 link_info = &dp_display->panel->link_info;
971
972 mode_bpp = dp->connector->display_info.bpc * num_components;
973 if (!mode_bpp)
974 mode_bpp = default_bpp;
975
976 mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
977 mode_bpp, mode_pclk_khz);
978
979 mode_rate_khz = mode_pclk_khz * mode_bpp;
980 supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
981
982 if (mode_rate_khz > supported_rate_khz)
983 return MODE_BAD;
984
985 return MODE_OK;
986 }
987
dp_display_get_modes(struct msm_dp * dp)988 int dp_display_get_modes(struct msm_dp *dp)
989 {
990 struct dp_display_private *dp_display;
991
992 if (!dp) {
993 DRM_ERROR("invalid params\n");
994 return 0;
995 }
996
997 dp_display = container_of(dp, struct dp_display_private, dp_display);
998
999 return dp_panel_get_modes(dp_display->panel,
1000 dp->connector);
1001 }
1002
dp_display_check_video_test(struct msm_dp * dp)1003 bool dp_display_check_video_test(struct msm_dp *dp)
1004 {
1005 struct dp_display_private *dp_display;
1006
1007 dp_display = container_of(dp, struct dp_display_private, dp_display);
1008
1009 return dp_display->panel->video_test;
1010 }
1011
dp_display_get_test_bpp(struct msm_dp * dp)1012 int dp_display_get_test_bpp(struct msm_dp *dp)
1013 {
1014 struct dp_display_private *dp_display;
1015
1016 if (!dp) {
1017 DRM_ERROR("invalid params\n");
1018 return 0;
1019 }
1020
1021 dp_display = container_of(dp, struct dp_display_private, dp_display);
1022
1023 return dp_link_bit_depth_to_bpp(
1024 dp_display->link->test_video.test_bit_depth);
1025 }
1026
msm_dp_snapshot(struct msm_disp_state * disp_state,struct msm_dp * dp)1027 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1028 {
1029 struct dp_display_private *dp_display;
1030
1031 dp_display = container_of(dp, struct dp_display_private, dp_display);
1032
1033 /*
1034 * if we are reading registers we need the link clocks to be on
1035 * however till DP cable is connected this will not happen as we
1036 * do not know the resolution to power up with. Hence check the
1037 * power_on status before dumping DP registers to avoid crash due
1038 * to unclocked access
1039 */
1040 mutex_lock(&dp_display->event_mutex);
1041
1042 if (!dp->power_on) {
1043 mutex_unlock(&dp_display->event_mutex);
1044 return;
1045 }
1046
1047 dp_catalog_snapshot(dp_display->catalog, disp_state);
1048
1049 mutex_unlock(&dp_display->event_mutex);
1050 }
1051
dp_display_set_psr(struct msm_dp * dp_display,bool enter)1052 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1053 {
1054 struct dp_display_private *dp;
1055
1056 if (!dp_display) {
1057 DRM_ERROR("invalid params\n");
1058 return;
1059 }
1060
1061 dp = container_of(dp_display, struct dp_display_private, dp_display);
1062 dp_ctrl_set_psr(dp->ctrl, enter);
1063 }
1064
hpd_event_thread(void * data)1065 static int hpd_event_thread(void *data)
1066 {
1067 struct dp_display_private *dp_priv;
1068 unsigned long flag;
1069 struct dp_event *todo;
1070 int timeout_mode = 0;
1071
1072 dp_priv = (struct dp_display_private *)data;
1073
1074 while (1) {
1075 if (timeout_mode) {
1076 wait_event_timeout(dp_priv->event_q,
1077 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1078 kthread_should_stop(), EVENT_TIMEOUT);
1079 } else {
1080 wait_event_interruptible(dp_priv->event_q,
1081 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1082 kthread_should_stop());
1083 }
1084
1085 if (kthread_should_stop())
1086 break;
1087
1088 spin_lock_irqsave(&dp_priv->event_lock, flag);
1089 todo = &dp_priv->event_list[dp_priv->event_gndx];
1090 if (todo->delay) {
1091 struct dp_event *todo_next;
1092
1093 dp_priv->event_gndx++;
1094 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1095
1096 /* re enter delay event into q */
1097 todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1098 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1099 todo_next->event_id = todo->event_id;
1100 todo_next->data = todo->data;
1101 todo_next->delay = todo->delay - 1;
1102
1103 /* clean up older event */
1104 todo->event_id = EV_NO_EVENT;
1105 todo->delay = 0;
1106
1107 /* switch to timeout mode */
1108 timeout_mode = 1;
1109 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1110 continue;
1111 }
1112
1113 /* timeout with no events in q */
1114 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1115 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1116 continue;
1117 }
1118
1119 dp_priv->event_gndx++;
1120 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1121 timeout_mode = 0;
1122 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1123
1124 switch (todo->event_id) {
1125 case EV_HPD_INIT_SETUP:
1126 dp_display_host_init(dp_priv);
1127 break;
1128 case EV_HPD_PLUG_INT:
1129 dp_hpd_plug_handle(dp_priv, todo->data);
1130 break;
1131 case EV_HPD_UNPLUG_INT:
1132 dp_hpd_unplug_handle(dp_priv, todo->data);
1133 break;
1134 case EV_IRQ_HPD_INT:
1135 dp_irq_hpd_handle(dp_priv, todo->data);
1136 break;
1137 case EV_USER_NOTIFICATION:
1138 dp_display_send_hpd_notification(dp_priv,
1139 todo->data);
1140 break;
1141 default:
1142 break;
1143 }
1144 }
1145
1146 return 0;
1147 }
1148
dp_hpd_event_thread_start(struct dp_display_private * dp_priv)1149 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1150 {
1151 /* set event q to empty */
1152 dp_priv->event_gndx = 0;
1153 dp_priv->event_pndx = 0;
1154
1155 dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1156 if (IS_ERR(dp_priv->ev_tsk))
1157 return PTR_ERR(dp_priv->ev_tsk);
1158
1159 return 0;
1160 }
1161
dp_display_irq_handler(int irq,void * dev_id)1162 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1163 {
1164 struct dp_display_private *dp = dev_id;
1165 irqreturn_t ret = IRQ_NONE;
1166 u32 hpd_isr_status;
1167
1168 if (!dp) {
1169 DRM_ERROR("invalid data\n");
1170 return IRQ_NONE;
1171 }
1172
1173 hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1174
1175 if (hpd_isr_status & 0x0F) {
1176 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1177 dp->dp_display.connector_type, hpd_isr_status);
1178 /* hpd related interrupts */
1179 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1180 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1181
1182 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1183 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1184 }
1185
1186 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1187 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1188 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1189 }
1190
1191 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1192 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1193
1194 ret = IRQ_HANDLED;
1195 }
1196
1197 /* DP controller isr */
1198 ret |= dp_ctrl_isr(dp->ctrl);
1199
1200 /* DP aux isr */
1201 ret |= dp_aux_isr(dp->aux);
1202
1203 return ret;
1204 }
1205
dp_display_request_irq(struct msm_dp * dp_display)1206 int dp_display_request_irq(struct msm_dp *dp_display)
1207 {
1208 int rc = 0;
1209 struct dp_display_private *dp;
1210
1211 if (!dp_display) {
1212 DRM_ERROR("invalid input\n");
1213 return -EINVAL;
1214 }
1215
1216 dp = container_of(dp_display, struct dp_display_private, dp_display);
1217
1218 dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1219 if (!dp->irq) {
1220 DRM_ERROR("failed to get irq\n");
1221 return -EINVAL;
1222 }
1223
1224 rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
1225 dp_display_irq_handler,
1226 IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1227 if (rc < 0) {
1228 DRM_ERROR("failed to request IRQ%u: %d\n",
1229 dp->irq, rc);
1230 return rc;
1231 }
1232
1233 return 0;
1234 }
1235
dp_display_get_desc(struct platform_device * pdev)1236 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1237 {
1238 const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1239 struct resource *res;
1240 int i;
1241
1242 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1243 if (!res)
1244 return NULL;
1245
1246 for (i = 0; i < descs[i].io_start; i++) {
1247 if (descs[i].io_start == res->start)
1248 return &descs[i];
1249 }
1250
1251 dev_err(&pdev->dev, "unknown displayport instance\n");
1252 return NULL;
1253 }
1254
dp_display_probe(struct platform_device * pdev)1255 static int dp_display_probe(struct platform_device *pdev)
1256 {
1257 int rc = 0;
1258 struct dp_display_private *dp;
1259 const struct msm_dp_desc *desc;
1260
1261 if (!pdev || !pdev->dev.of_node) {
1262 DRM_ERROR("pdev not found\n");
1263 return -ENODEV;
1264 }
1265
1266 dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1267 if (!dp)
1268 return -ENOMEM;
1269
1270 desc = dp_display_get_desc(pdev);
1271 if (!desc)
1272 return -EINVAL;
1273
1274 dp->pdev = pdev;
1275 dp->name = "drm_dp";
1276 dp->id = desc->id;
1277 dp->dp_display.connector_type = desc->connector_type;
1278 dp->wide_bus_en = desc->wide_bus_en;
1279 dp->dp_display.is_edp =
1280 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1281
1282 rc = dp_init_sub_modules(dp);
1283 if (rc) {
1284 DRM_ERROR("init sub module failed\n");
1285 return -EPROBE_DEFER;
1286 }
1287
1288 /* setup event q */
1289 mutex_init(&dp->event_mutex);
1290 init_waitqueue_head(&dp->event_q);
1291 spin_lock_init(&dp->event_lock);
1292
1293 /* Store DP audio handle inside DP display */
1294 dp->dp_display.dp_audio = dp->audio;
1295
1296 init_completion(&dp->audio_comp);
1297
1298 platform_set_drvdata(pdev, &dp->dp_display);
1299
1300 rc = component_add(&pdev->dev, &dp_display_comp_ops);
1301 if (rc) {
1302 DRM_ERROR("component add failed, rc=%d\n", rc);
1303 dp_display_deinit_sub_modules(dp);
1304 }
1305
1306 return rc;
1307 }
1308
dp_display_remove(struct platform_device * pdev)1309 static int dp_display_remove(struct platform_device *pdev)
1310 {
1311 struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1312
1313 component_del(&pdev->dev, &dp_display_comp_ops);
1314 dp_display_deinit_sub_modules(dp);
1315
1316 platform_set_drvdata(pdev, NULL);
1317
1318 return 0;
1319 }
1320
dp_pm_resume(struct device * dev)1321 static int dp_pm_resume(struct device *dev)
1322 {
1323 struct platform_device *pdev = to_platform_device(dev);
1324 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1325 struct dp_display_private *dp;
1326 int sink_count = 0;
1327
1328 dp = container_of(dp_display, struct dp_display_private, dp_display);
1329
1330 mutex_lock(&dp->event_mutex);
1331
1332 drm_dbg_dp(dp->drm_dev,
1333 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1334 dp->dp_display.connector_type, dp->core_initialized,
1335 dp->phy_initialized, dp_display->power_on);
1336
1337 /* start from disconnected state */
1338 dp->hpd_state = ST_DISCONNECTED;
1339
1340 /* turn on dp ctrl/phy */
1341 dp_display_host_init(dp);
1342
1343 if (dp_display->is_edp)
1344 dp_catalog_ctrl_hpd_enable(dp->catalog);
1345
1346 if (dp_catalog_link_is_connected(dp->catalog)) {
1347 /*
1348 * set sink to normal operation mode -- D0
1349 * before dpcd read
1350 */
1351 dp_display_host_phy_init(dp);
1352 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1353 sink_count = drm_dp_read_sink_count(dp->aux);
1354 if (sink_count < 0)
1355 sink_count = 0;
1356
1357 dp_display_host_phy_exit(dp);
1358 }
1359
1360 dp->link->sink_count = sink_count;
1361 /*
1362 * can not declared display is connected unless
1363 * HDMI cable is plugged in and sink_count of
1364 * dongle become 1
1365 * also only signal audio when disconnected
1366 */
1367 if (dp->link->sink_count) {
1368 dp->dp_display.is_connected = true;
1369 } else {
1370 dp->dp_display.is_connected = false;
1371 dp_display_handle_plugged_change(dp_display, false);
1372 }
1373
1374 drm_dbg_dp(dp->drm_dev,
1375 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1376 dp->dp_display.connector_type, dp->link->sink_count,
1377 dp->dp_display.is_connected, dp->core_initialized,
1378 dp->phy_initialized, dp_display->power_on);
1379
1380 mutex_unlock(&dp->event_mutex);
1381
1382 return 0;
1383 }
1384
dp_pm_suspend(struct device * dev)1385 static int dp_pm_suspend(struct device *dev)
1386 {
1387 struct platform_device *pdev = to_platform_device(dev);
1388 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1389 struct dp_display_private *dp;
1390
1391 dp = container_of(dp_display, struct dp_display_private, dp_display);
1392
1393 mutex_lock(&dp->event_mutex);
1394
1395 drm_dbg_dp(dp->drm_dev,
1396 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1397 dp->dp_display.connector_type, dp->core_initialized,
1398 dp->phy_initialized, dp_display->power_on);
1399
1400 /* mainlink enabled */
1401 if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1402 dp_ctrl_off_link_stream(dp->ctrl);
1403
1404 dp_display_host_phy_exit(dp);
1405
1406 /* host_init will be called at pm_resume */
1407 dp_display_host_deinit(dp);
1408
1409 dp->hpd_state = ST_SUSPENDED;
1410
1411 drm_dbg_dp(dp->drm_dev,
1412 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1413 dp->dp_display.connector_type, dp->core_initialized,
1414 dp->phy_initialized, dp_display->power_on);
1415
1416 mutex_unlock(&dp->event_mutex);
1417
1418 return 0;
1419 }
1420
1421 static const struct dev_pm_ops dp_pm_ops = {
1422 .suspend = dp_pm_suspend,
1423 .resume = dp_pm_resume,
1424 };
1425
1426 static struct platform_driver dp_display_driver = {
1427 .probe = dp_display_probe,
1428 .remove = dp_display_remove,
1429 .driver = {
1430 .name = "msm-dp-display",
1431 .of_match_table = dp_dt_match,
1432 .suppress_bind_attrs = true,
1433 .pm = &dp_pm_ops,
1434 },
1435 };
1436
msm_dp_register(void)1437 int __init msm_dp_register(void)
1438 {
1439 int ret;
1440
1441 ret = platform_driver_register(&dp_display_driver);
1442 if (ret)
1443 DRM_ERROR("Dp display driver register failed");
1444
1445 return ret;
1446 }
1447
msm_dp_unregister(void)1448 void __exit msm_dp_unregister(void)
1449 {
1450 platform_driver_unregister(&dp_display_driver);
1451 }
1452
msm_dp_irq_postinstall(struct msm_dp * dp_display)1453 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1454 {
1455 struct dp_display_private *dp;
1456
1457 if (!dp_display)
1458 return;
1459
1460 dp = container_of(dp_display, struct dp_display_private, dp_display);
1461
1462 if (!dp_display->is_edp)
1463 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
1464 }
1465
msm_dp_wide_bus_available(const struct msm_dp * dp_display)1466 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1467 {
1468 struct dp_display_private *dp;
1469
1470 dp = container_of(dp_display, struct dp_display_private, dp_display);
1471
1472 return dp->wide_bus_en;
1473 }
1474
msm_dp_debugfs_init(struct msm_dp * dp_display,struct drm_minor * minor)1475 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1476 {
1477 struct dp_display_private *dp;
1478 struct device *dev;
1479 int rc;
1480
1481 dp = container_of(dp_display, struct dp_display_private, dp_display);
1482 dev = &dp->pdev->dev;
1483
1484 dp->debug = dp_debug_get(dev, dp->panel,
1485 dp->link, dp->dp_display.connector,
1486 minor);
1487 if (IS_ERR(dp->debug)) {
1488 rc = PTR_ERR(dp->debug);
1489 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1490 dp->debug = NULL;
1491 }
1492 }
1493
dp_display_get_next_bridge(struct msm_dp * dp)1494 static int dp_display_get_next_bridge(struct msm_dp *dp)
1495 {
1496 int rc;
1497 struct dp_display_private *dp_priv;
1498 struct device_node *aux_bus;
1499 struct device *dev;
1500
1501 dp_priv = container_of(dp, struct dp_display_private, dp_display);
1502 dev = &dp_priv->pdev->dev;
1503 aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1504
1505 if (aux_bus && dp->is_edp) {
1506 dp_display_host_init(dp_priv);
1507 dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
1508 dp_display_host_phy_init(dp_priv);
1509
1510 /*
1511 * The code below assumes that the panel will finish probing
1512 * by the time devm_of_dp_aux_populate_ep_devices() returns.
1513 * This isn't a great assumption since it will fail if the
1514 * panel driver is probed asynchronously but is the best we
1515 * can do without a bigger driver reorganization.
1516 */
1517 rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
1518 of_node_put(aux_bus);
1519 if (rc)
1520 goto error;
1521 } else if (dp->is_edp) {
1522 DRM_ERROR("eDP aux_bus not found\n");
1523 return -ENODEV;
1524 }
1525
1526 /*
1527 * External bridges are mandatory for eDP interfaces: one has to
1528 * provide at least an eDP panel (which gets wrapped into panel-bridge).
1529 *
1530 * For DisplayPort interfaces external bridges are optional, so
1531 * silently ignore an error if one is not present (-ENODEV).
1532 */
1533 rc = devm_dp_parser_find_next_bridge(dp->drm_dev->dev, dp_priv->parser);
1534 if (!dp->is_edp && rc == -ENODEV)
1535 return 0;
1536
1537 if (!rc) {
1538 dp->next_bridge = dp_priv->parser->next_bridge;
1539 return 0;
1540 }
1541
1542 error:
1543 if (dp->is_edp) {
1544 of_dp_aux_depopulate_bus(dp_priv->aux);
1545 dp_display_host_phy_exit(dp_priv);
1546 dp_display_host_deinit(dp_priv);
1547 }
1548 return rc;
1549 }
1550
msm_dp_modeset_init(struct msm_dp * dp_display,struct drm_device * dev,struct drm_encoder * encoder)1551 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1552 struct drm_encoder *encoder)
1553 {
1554 struct msm_drm_private *priv = dev->dev_private;
1555 struct dp_display_private *dp_priv;
1556 int ret;
1557
1558 dp_display->drm_dev = dev;
1559
1560 dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1561
1562 ret = dp_display_request_irq(dp_display);
1563 if (ret) {
1564 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1565 return ret;
1566 }
1567
1568 ret = dp_display_get_next_bridge(dp_display);
1569 if (ret)
1570 return ret;
1571
1572 dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1573 if (IS_ERR(dp_display->bridge)) {
1574 ret = PTR_ERR(dp_display->bridge);
1575 DRM_DEV_ERROR(dev->dev,
1576 "failed to create dp bridge: %d\n", ret);
1577 dp_display->bridge = NULL;
1578 return ret;
1579 }
1580
1581 priv->bridges[priv->num_bridges++] = dp_display->bridge;
1582
1583 dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1584 if (IS_ERR(dp_display->connector)) {
1585 ret = PTR_ERR(dp_display->connector);
1586 DRM_DEV_ERROR(dev->dev,
1587 "failed to create dp connector: %d\n", ret);
1588 dp_display->connector = NULL;
1589 return ret;
1590 }
1591
1592 dp_priv->panel->connector = dp_display->connector;
1593
1594 return 0;
1595 }
1596
dp_bridge_atomic_enable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1597 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1598 struct drm_bridge_state *old_bridge_state)
1599 {
1600 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1601 struct msm_dp *dp = dp_bridge->dp_display;
1602 int rc = 0;
1603 struct dp_display_private *dp_display;
1604 u32 state;
1605 bool force_link_train = false;
1606
1607 dp_display = container_of(dp, struct dp_display_private, dp_display);
1608 if (!dp_display->dp_mode.drm_mode.clock) {
1609 DRM_ERROR("invalid params\n");
1610 return;
1611 }
1612
1613 if (dp->is_edp)
1614 dp_hpd_plug_handle(dp_display, 0);
1615
1616 mutex_lock(&dp_display->event_mutex);
1617
1618 state = dp_display->hpd_state;
1619 if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1620 mutex_unlock(&dp_display->event_mutex);
1621 return;
1622 }
1623
1624 rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1625 if (rc) {
1626 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1627 mutex_unlock(&dp_display->event_mutex);
1628 return;
1629 }
1630
1631 state = dp_display->hpd_state;
1632
1633 if (state == ST_DISPLAY_OFF) {
1634 dp_display_host_phy_init(dp_display);
1635 force_link_train = true;
1636 }
1637
1638 dp_display_enable(dp_display, force_link_train);
1639
1640 rc = dp_display_post_enable(dp);
1641 if (rc) {
1642 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1643 dp_display_disable(dp_display);
1644 }
1645
1646 /* completed connection */
1647 dp_display->hpd_state = ST_CONNECTED;
1648
1649 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1650 mutex_unlock(&dp_display->event_mutex);
1651 }
1652
dp_bridge_atomic_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1653 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1654 struct drm_bridge_state *old_bridge_state)
1655 {
1656 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1657 struct msm_dp *dp = dp_bridge->dp_display;
1658 struct dp_display_private *dp_display;
1659
1660 dp_display = container_of(dp, struct dp_display_private, dp_display);
1661
1662 dp_ctrl_push_idle(dp_display->ctrl);
1663 }
1664
dp_bridge_atomic_post_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1665 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1666 struct drm_bridge_state *old_bridge_state)
1667 {
1668 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1669 struct msm_dp *dp = dp_bridge->dp_display;
1670 u32 state;
1671 struct dp_display_private *dp_display;
1672
1673 dp_display = container_of(dp, struct dp_display_private, dp_display);
1674
1675 if (dp->is_edp)
1676 dp_hpd_unplug_handle(dp_display, 0);
1677
1678 mutex_lock(&dp_display->event_mutex);
1679
1680 state = dp_display->hpd_state;
1681 if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1682 mutex_unlock(&dp_display->event_mutex);
1683 return;
1684 }
1685
1686 dp_display_disable(dp_display);
1687
1688 state = dp_display->hpd_state;
1689 if (state == ST_DISCONNECT_PENDING) {
1690 /* completed disconnection */
1691 dp_display->hpd_state = ST_DISCONNECTED;
1692 } else {
1693 dp_display->hpd_state = ST_DISPLAY_OFF;
1694 }
1695
1696 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1697 mutex_unlock(&dp_display->event_mutex);
1698 }
1699
dp_bridge_mode_set(struct drm_bridge * drm_bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)1700 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1701 const struct drm_display_mode *mode,
1702 const struct drm_display_mode *adjusted_mode)
1703 {
1704 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1705 struct msm_dp *dp = dp_bridge->dp_display;
1706 struct dp_display_private *dp_display;
1707
1708 dp_display = container_of(dp, struct dp_display_private, dp_display);
1709
1710 memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1711
1712 if (dp_display_check_video_test(dp))
1713 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1714 else /* Default num_components per pixel = 3 */
1715 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1716
1717 if (!dp_display->dp_mode.bpp)
1718 dp_display->dp_mode.bpp = 24; /* Default bpp */
1719
1720 drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1721
1722 dp_display->dp_mode.v_active_low =
1723 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1724
1725 dp_display->dp_mode.h_active_low =
1726 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1727 }
1728
dp_bridge_hpd_enable(struct drm_bridge * bridge)1729 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1730 {
1731 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1732 struct msm_dp *dp_display = dp_bridge->dp_display;
1733 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1734
1735 mutex_lock(&dp->event_mutex);
1736 dp_catalog_ctrl_hpd_enable(dp->catalog);
1737
1738 /* enable HDP interrupts */
1739 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1740
1741 dp_display->internal_hpd = true;
1742 mutex_unlock(&dp->event_mutex);
1743 }
1744
dp_bridge_hpd_disable(struct drm_bridge * bridge)1745 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1746 {
1747 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1748 struct msm_dp *dp_display = dp_bridge->dp_display;
1749 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1750
1751 mutex_lock(&dp->event_mutex);
1752 /* disable HDP interrupts */
1753 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1754 dp_catalog_ctrl_hpd_disable(dp->catalog);
1755
1756 dp_display->internal_hpd = false;
1757 mutex_unlock(&dp->event_mutex);
1758 }
1759
dp_bridge_hpd_notify(struct drm_bridge * bridge,enum drm_connector_status status)1760 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1761 enum drm_connector_status status)
1762 {
1763 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1764 struct msm_dp *dp_display = dp_bridge->dp_display;
1765 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1766
1767 /* Without next_bridge interrupts are handled by the DP core directly */
1768 if (dp_display->internal_hpd)
1769 return;
1770
1771 if (!dp->core_initialized) {
1772 drm_dbg_dp(dp->drm_dev, "not initialized\n");
1773 return;
1774 }
1775
1776 if (!dp_display->is_connected && status == connector_status_connected)
1777 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1778 else if (dp_display->is_connected && status == connector_status_disconnected)
1779 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1780 }
1781