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 of_device_id dp_dt_match[] = {
175 { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
176 { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
177 { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
178 { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
179 { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
180 { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
181 { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
182 { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
183 { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
184 {}
185 };
186
dev_get_dp_display_private(struct device * dev)187 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
188 {
189 struct msm_dp *dp = dev_get_drvdata(dev);
190
191 return container_of(dp, struct dp_display_private, dp_display);
192 }
193
dp_add_event(struct dp_display_private * dp_priv,u32 event,u32 data,u32 delay)194 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
195 u32 data, u32 delay)
196 {
197 unsigned long flag;
198 struct dp_event *todo;
199 int pndx;
200
201 spin_lock_irqsave(&dp_priv->event_lock, flag);
202 pndx = dp_priv->event_pndx + 1;
203 pndx %= DP_EVENT_Q_MAX;
204 if (pndx == dp_priv->event_gndx) {
205 pr_err("event_q is full: pndx=%d gndx=%d\n",
206 dp_priv->event_pndx, dp_priv->event_gndx);
207 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
208 return -EPERM;
209 }
210 todo = &dp_priv->event_list[dp_priv->event_pndx++];
211 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
212 todo->event_id = event;
213 todo->data = data;
214 todo->delay = delay;
215 wake_up(&dp_priv->event_q);
216 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
217
218 return 0;
219 }
220
dp_del_event(struct dp_display_private * dp_priv,u32 event)221 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
222 {
223 unsigned long flag;
224 struct dp_event *todo;
225 u32 gndx;
226
227 spin_lock_irqsave(&dp_priv->event_lock, flag);
228 if (dp_priv->event_pndx == dp_priv->event_gndx) {
229 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
230 return -ENOENT;
231 }
232
233 gndx = dp_priv->event_gndx;
234 while (dp_priv->event_pndx != gndx) {
235 todo = &dp_priv->event_list[gndx];
236 if (todo->event_id == event) {
237 todo->event_id = EV_NO_EVENT; /* deleted */
238 todo->delay = 0;
239 }
240 gndx++;
241 gndx %= DP_EVENT_Q_MAX;
242 }
243 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
244
245 return 0;
246 }
247
dp_display_signal_audio_start(struct msm_dp * dp_display)248 void dp_display_signal_audio_start(struct msm_dp *dp_display)
249 {
250 struct dp_display_private *dp;
251
252 dp = container_of(dp_display, struct dp_display_private, dp_display);
253
254 reinit_completion(&dp->audio_comp);
255 }
256
dp_display_signal_audio_complete(struct msm_dp * dp_display)257 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
258 {
259 struct dp_display_private *dp;
260
261 dp = container_of(dp_display, struct dp_display_private, dp_display);
262
263 complete_all(&dp->audio_comp);
264 }
265
266 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
267
dp_display_bind(struct device * dev,struct device * master,void * data)268 static int dp_display_bind(struct device *dev, struct device *master,
269 void *data)
270 {
271 int rc = 0;
272 struct dp_display_private *dp = dev_get_dp_display_private(dev);
273 struct msm_drm_private *priv = dev_get_drvdata(master);
274 struct drm_device *drm = priv->dev;
275
276 dp->dp_display.drm_dev = drm;
277 priv->dp[dp->id] = &dp->dp_display;
278
279 rc = dp->parser->parse(dp->parser);
280 if (rc) {
281 DRM_ERROR("device tree parsing failed\n");
282 goto end;
283 }
284
285
286 dp->drm_dev = drm;
287 dp->aux->drm_dev = drm;
288 rc = dp_aux_register(dp->aux);
289 if (rc) {
290 DRM_ERROR("DRM DP AUX register failed\n");
291 goto end;
292 }
293
294 rc = dp_power_client_init(dp->power);
295 if (rc) {
296 DRM_ERROR("Power client create failed\n");
297 goto end;
298 }
299
300 rc = dp_register_audio_driver(dev, dp->audio);
301 if (rc) {
302 DRM_ERROR("Audio registration Dp failed\n");
303 goto end;
304 }
305
306 rc = dp_hpd_event_thread_start(dp);
307 if (rc) {
308 DRM_ERROR("Event thread create failed\n");
309 goto end;
310 }
311
312 return 0;
313 end:
314 return rc;
315 }
316
dp_display_unbind(struct device * dev,struct device * master,void * data)317 static void dp_display_unbind(struct device *dev, struct device *master,
318 void *data)
319 {
320 struct dp_display_private *dp = dev_get_dp_display_private(dev);
321 struct msm_drm_private *priv = dev_get_drvdata(master);
322
323 /* disable all HPD interrupts */
324 if (dp->core_initialized)
325 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
326
327 kthread_stop(dp->ev_tsk);
328
329 of_dp_aux_depopulate_bus(dp->aux);
330
331 dp_power_client_deinit(dp->power);
332 dp_unregister_audio_driver(dev, dp->audio);
333 dp_aux_unregister(dp->aux);
334 dp->drm_dev = NULL;
335 dp->aux->drm_dev = NULL;
336 priv->dp[dp->id] = NULL;
337 }
338
339 static const struct component_ops dp_display_comp_ops = {
340 .bind = dp_display_bind,
341 .unbind = dp_display_unbind,
342 };
343
dp_display_is_ds_bridge(struct dp_panel * panel)344 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
345 {
346 return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
347 DP_DWN_STRM_PORT_PRESENT);
348 }
349
dp_display_is_sink_count_zero(struct dp_display_private * dp)350 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
351 {
352 drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
353 dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
354 dp->link->sink_count);
355 return dp_display_is_ds_bridge(dp->panel) &&
356 (dp->link->sink_count == 0);
357 }
358
dp_display_send_hpd_event(struct msm_dp * dp_display)359 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
360 {
361 struct dp_display_private *dp;
362 struct drm_connector *connector;
363
364 dp = container_of(dp_display, struct dp_display_private, dp_display);
365
366 connector = dp->dp_display.connector;
367 drm_helper_hpd_irq_event(connector->dev);
368 }
369
370
dp_display_send_hpd_notification(struct dp_display_private * dp,bool hpd)371 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
372 bool hpd)
373 {
374 if ((hpd && dp->dp_display.is_connected) ||
375 (!hpd && !dp->dp_display.is_connected)) {
376 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
377 (hpd ? "on" : "off"));
378 return 0;
379 }
380
381 /* reset video pattern flag on disconnect */
382 if (!hpd)
383 dp->panel->video_test = false;
384
385 dp->dp_display.is_connected = hpd;
386
387 drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
388 dp->dp_display.connector_type, hpd);
389 dp_display_send_hpd_event(&dp->dp_display);
390
391 return 0;
392 }
393
dp_display_process_hpd_high(struct dp_display_private * dp)394 static int dp_display_process_hpd_high(struct dp_display_private *dp)
395 {
396 int rc = 0;
397 struct edid *edid;
398
399 dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
400 dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
401
402 drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
403 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
404
405 rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
406 if (rc)
407 goto end;
408
409 dp_link_process_request(dp->link);
410
411 edid = dp->panel->edid;
412
413 dp->dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
414
415 dp->audio_supported = drm_detect_monitor_audio(edid);
416 dp_panel_handle_sink_request(dp->panel);
417
418 dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
419
420 /*
421 * set sink to normal operation mode -- D0
422 * before dpcd read
423 */
424 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
425
426 dp_link_reset_phy_params_vx_px(dp->link);
427 rc = dp_ctrl_on_link(dp->ctrl);
428 if (rc) {
429 DRM_ERROR("failed to complete DP link training\n");
430 goto end;
431 }
432
433 dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
434
435 end:
436 return rc;
437 }
438
dp_display_host_phy_init(struct dp_display_private * dp)439 static void dp_display_host_phy_init(struct dp_display_private *dp)
440 {
441 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
442 dp->dp_display.connector_type, dp->core_initialized,
443 dp->phy_initialized);
444
445 if (!dp->phy_initialized) {
446 dp_ctrl_phy_init(dp->ctrl);
447 dp->phy_initialized = true;
448 }
449 }
450
dp_display_host_phy_exit(struct dp_display_private * dp)451 static void dp_display_host_phy_exit(struct dp_display_private *dp)
452 {
453 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
454 dp->dp_display.connector_type, dp->core_initialized,
455 dp->phy_initialized);
456
457 if (dp->phy_initialized) {
458 dp_ctrl_phy_exit(dp->ctrl);
459 dp->phy_initialized = false;
460 }
461 }
462
dp_display_host_init(struct dp_display_private * dp)463 static void dp_display_host_init(struct dp_display_private *dp)
464 {
465 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
466 dp->dp_display.connector_type, dp->core_initialized,
467 dp->phy_initialized);
468
469 dp_power_init(dp->power);
470 dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
471 dp_aux_init(dp->aux);
472 dp->core_initialized = true;
473 }
474
dp_display_host_deinit(struct dp_display_private * dp)475 static void dp_display_host_deinit(struct dp_display_private *dp)
476 {
477 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
478 dp->dp_display.connector_type, dp->core_initialized,
479 dp->phy_initialized);
480
481 dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
482 dp_aux_deinit(dp->aux);
483 dp_power_deinit(dp->power);
484 dp->core_initialized = false;
485 }
486
dp_display_usbpd_configure_cb(struct device * dev)487 static int dp_display_usbpd_configure_cb(struct device *dev)
488 {
489 struct dp_display_private *dp = dev_get_dp_display_private(dev);
490
491 dp_display_host_phy_init(dp);
492
493 return dp_display_process_hpd_high(dp);
494 }
495
dp_display_notify_disconnect(struct device * dev)496 static int dp_display_notify_disconnect(struct device *dev)
497 {
498 struct dp_display_private *dp = dev_get_dp_display_private(dev);
499
500 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
501
502 return 0;
503 }
504
dp_display_handle_video_request(struct dp_display_private * dp)505 static void dp_display_handle_video_request(struct dp_display_private *dp)
506 {
507 if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
508 dp->panel->video_test = true;
509 dp_link_send_test_response(dp->link);
510 }
511 }
512
dp_display_handle_port_ststus_changed(struct dp_display_private * dp)513 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
514 {
515 int rc = 0;
516
517 if (dp_display_is_sink_count_zero(dp)) {
518 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
519 if (dp->hpd_state != ST_DISCONNECTED) {
520 dp->hpd_state = ST_DISCONNECT_PENDING;
521 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
522 }
523 } else {
524 if (dp->hpd_state == ST_DISCONNECTED) {
525 dp->hpd_state = ST_MAINLINK_READY;
526 rc = dp_display_process_hpd_high(dp);
527 if (rc)
528 dp->hpd_state = ST_DISCONNECTED;
529 }
530 }
531
532 return rc;
533 }
534
dp_display_handle_irq_hpd(struct dp_display_private * dp)535 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
536 {
537 u32 sink_request = dp->link->sink_request;
538
539 drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
540 if (dp->hpd_state == ST_DISCONNECTED) {
541 if (sink_request & DP_LINK_STATUS_UPDATED) {
542 drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
543 sink_request);
544 DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
545 return -EINVAL;
546 }
547 }
548
549 dp_ctrl_handle_sink_request(dp->ctrl);
550
551 if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
552 dp_display_handle_video_request(dp);
553
554 return 0;
555 }
556
dp_display_usbpd_attention_cb(struct device * dev)557 static int dp_display_usbpd_attention_cb(struct device *dev)
558 {
559 int rc = 0;
560 u32 sink_request;
561 struct dp_display_private *dp = dev_get_dp_display_private(dev);
562
563 /* check for any test request issued by sink */
564 rc = dp_link_process_request(dp->link);
565 if (!rc) {
566 sink_request = dp->link->sink_request;
567 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
568 dp->hpd_state, sink_request);
569 if (sink_request & DS_PORT_STATUS_CHANGED)
570 rc = dp_display_handle_port_ststus_changed(dp);
571 else
572 rc = dp_display_handle_irq_hpd(dp);
573 }
574
575 return rc;
576 }
577
dp_hpd_plug_handle(struct dp_display_private * dp,u32 data)578 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
579 {
580 u32 state;
581 int ret;
582
583 mutex_lock(&dp->event_mutex);
584
585 state = dp->hpd_state;
586 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
587 dp->dp_display.connector_type, state);
588
589 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
590 mutex_unlock(&dp->event_mutex);
591 return 0;
592 }
593
594 if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
595 mutex_unlock(&dp->event_mutex);
596 return 0;
597 }
598
599 if (state == ST_DISCONNECT_PENDING) {
600 /* wait until ST_DISCONNECTED */
601 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
602 mutex_unlock(&dp->event_mutex);
603 return 0;
604 }
605
606 ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
607 if (ret) { /* link train failed */
608 dp->hpd_state = ST_DISCONNECTED;
609 } else {
610 dp->hpd_state = ST_MAINLINK_READY;
611 }
612
613 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
614 dp->dp_display.connector_type, state);
615 mutex_unlock(&dp->event_mutex);
616
617 /* uevent will complete connection part */
618 return 0;
619 };
620
dp_display_handle_plugged_change(struct msm_dp * dp_display,bool plugged)621 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
622 bool plugged)
623 {
624 struct dp_display_private *dp;
625
626 dp = container_of(dp_display,
627 struct dp_display_private, dp_display);
628
629 /* notify audio subsystem only if sink supports audio */
630 if (dp_display->plugged_cb && dp_display->codec_dev &&
631 dp->audio_supported)
632 dp_display->plugged_cb(dp_display->codec_dev, plugged);
633 }
634
dp_hpd_unplug_handle(struct dp_display_private * dp,u32 data)635 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
636 {
637 u32 state;
638
639 mutex_lock(&dp->event_mutex);
640
641 state = dp->hpd_state;
642
643 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
644 dp->dp_display.connector_type, state);
645
646 /* unplugged, no more irq_hpd handle */
647 dp_del_event(dp, EV_IRQ_HPD_INT);
648
649 if (state == ST_DISCONNECTED) {
650 /* triggered by irq_hdp with sink_count = 0 */
651 if (dp->link->sink_count == 0) {
652 dp_display_host_phy_exit(dp);
653 }
654 dp_display_notify_disconnect(&dp->pdev->dev);
655 mutex_unlock(&dp->event_mutex);
656 return 0;
657 } else if (state == ST_DISCONNECT_PENDING) {
658 mutex_unlock(&dp->event_mutex);
659 return 0;
660 } else if (state == ST_MAINLINK_READY) {
661 dp_ctrl_off_link(dp->ctrl);
662 dp_display_host_phy_exit(dp);
663 dp->hpd_state = ST_DISCONNECTED;
664 dp_display_notify_disconnect(&dp->pdev->dev);
665 mutex_unlock(&dp->event_mutex);
666 return 0;
667 }
668
669 /*
670 * We don't need separate work for disconnect as
671 * connect/attention interrupts are disabled
672 */
673 dp_display_notify_disconnect(&dp->pdev->dev);
674
675 if (state == ST_DISPLAY_OFF) {
676 dp->hpd_state = ST_DISCONNECTED;
677 } else {
678 dp->hpd_state = ST_DISCONNECT_PENDING;
679 }
680
681 /* signal the disconnect event early to ensure proper teardown */
682 dp_display_handle_plugged_change(&dp->dp_display, false);
683
684 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
685 dp->dp_display.connector_type, state);
686
687 /* uevent will complete disconnection part */
688 mutex_unlock(&dp->event_mutex);
689 return 0;
690 }
691
dp_irq_hpd_handle(struct dp_display_private * dp,u32 data)692 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
693 {
694 u32 state;
695
696 mutex_lock(&dp->event_mutex);
697
698 /* irq_hpd can happen at either connected or disconnected state */
699 state = dp->hpd_state;
700 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
701 dp->dp_display.connector_type, state);
702
703 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
704 mutex_unlock(&dp->event_mutex);
705 return 0;
706 }
707
708 if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
709 /* wait until ST_CONNECTED */
710 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
711 mutex_unlock(&dp->event_mutex);
712 return 0;
713 }
714
715 dp_display_usbpd_attention_cb(&dp->pdev->dev);
716
717 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
718 dp->dp_display.connector_type, state);
719
720 mutex_unlock(&dp->event_mutex);
721
722 return 0;
723 }
724
dp_display_deinit_sub_modules(struct dp_display_private * dp)725 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
726 {
727 dp_debug_put(dp->debug);
728 dp_audio_put(dp->audio);
729 dp_panel_put(dp->panel);
730 dp_aux_put(dp->aux);
731 }
732
dp_init_sub_modules(struct dp_display_private * dp)733 static int dp_init_sub_modules(struct dp_display_private *dp)
734 {
735 int rc = 0;
736 struct device *dev = &dp->pdev->dev;
737 struct dp_panel_in panel_in = {
738 .dev = dev,
739 };
740
741 dp->parser = dp_parser_get(dp->pdev);
742 if (IS_ERR(dp->parser)) {
743 rc = PTR_ERR(dp->parser);
744 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
745 dp->parser = NULL;
746 goto error;
747 }
748
749 dp->catalog = dp_catalog_get(dev, &dp->parser->io);
750 if (IS_ERR(dp->catalog)) {
751 rc = PTR_ERR(dp->catalog);
752 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
753 dp->catalog = NULL;
754 goto error;
755 }
756
757 dp->power = dp_power_get(dev, dp->parser);
758 if (IS_ERR(dp->power)) {
759 rc = PTR_ERR(dp->power);
760 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
761 dp->power = NULL;
762 goto error;
763 }
764
765 dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
766 if (IS_ERR(dp->aux)) {
767 rc = PTR_ERR(dp->aux);
768 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
769 dp->aux = NULL;
770 goto error;
771 }
772
773 dp->link = dp_link_get(dev, dp->aux);
774 if (IS_ERR(dp->link)) {
775 rc = PTR_ERR(dp->link);
776 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
777 dp->link = NULL;
778 goto error_link;
779 }
780
781 panel_in.aux = dp->aux;
782 panel_in.catalog = dp->catalog;
783 panel_in.link = dp->link;
784
785 dp->panel = dp_panel_get(&panel_in);
786 if (IS_ERR(dp->panel)) {
787 rc = PTR_ERR(dp->panel);
788 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
789 dp->panel = NULL;
790 goto error_link;
791 }
792
793 dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
794 dp->power, dp->catalog, dp->parser);
795 if (IS_ERR(dp->ctrl)) {
796 rc = PTR_ERR(dp->ctrl);
797 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
798 dp->ctrl = NULL;
799 goto error_ctrl;
800 }
801
802 dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
803 if (IS_ERR(dp->audio)) {
804 rc = PTR_ERR(dp->audio);
805 pr_err("failed to initialize audio, rc = %d\n", rc);
806 dp->audio = NULL;
807 goto error_ctrl;
808 }
809
810 /* populate wide_bus_en to differernt layers */
811 dp->ctrl->wide_bus_en = dp->wide_bus_en;
812 dp->catalog->wide_bus_en = dp->wide_bus_en;
813
814 return rc;
815
816 error_ctrl:
817 dp_panel_put(dp->panel);
818 error_link:
819 dp_aux_put(dp->aux);
820 error:
821 return rc;
822 }
823
dp_display_set_mode(struct msm_dp * dp_display,struct dp_display_mode * mode)824 static int dp_display_set_mode(struct msm_dp *dp_display,
825 struct dp_display_mode *mode)
826 {
827 struct dp_display_private *dp;
828
829 dp = container_of(dp_display, struct dp_display_private, dp_display);
830
831 drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
832 dp->panel->dp_mode.bpp = mode->bpp;
833 dp->panel->dp_mode.capabilities = mode->capabilities;
834 dp_panel_init_panel_info(dp->panel);
835 return 0;
836 }
837
dp_display_enable(struct dp_display_private * dp,bool force_link_train)838 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
839 {
840 int rc = 0;
841 struct msm_dp *dp_display = &dp->dp_display;
842
843 drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
844 if (dp_display->power_on) {
845 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
846 return 0;
847 }
848
849 rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
850 if (!rc)
851 dp_display->power_on = true;
852
853 return rc;
854 }
855
dp_display_post_enable(struct msm_dp * dp_display)856 static int dp_display_post_enable(struct msm_dp *dp_display)
857 {
858 struct dp_display_private *dp;
859 u32 rate;
860
861 dp = container_of(dp_display, struct dp_display_private, dp_display);
862
863 rate = dp->link->link_params.rate;
864
865 if (dp->audio_supported) {
866 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
867 dp->audio->lane_count = dp->link->link_params.num_lanes;
868 }
869
870 /* signal the connect event late to synchronize video and display */
871 dp_display_handle_plugged_change(dp_display, true);
872
873 if (dp_display->psr_supported)
874 dp_ctrl_config_psr(dp->ctrl);
875
876 return 0;
877 }
878
dp_display_disable(struct dp_display_private * dp)879 static int dp_display_disable(struct dp_display_private *dp)
880 {
881 struct msm_dp *dp_display = &dp->dp_display;
882
883 if (!dp_display->power_on)
884 return 0;
885
886 /* wait only if audio was enabled */
887 if (dp_display->audio_enabled) {
888 /* signal the disconnect event */
889 dp_display_handle_plugged_change(dp_display, false);
890 if (!wait_for_completion_timeout(&dp->audio_comp,
891 HZ * 5))
892 DRM_ERROR("audio comp timeout\n");
893 }
894
895 dp_display->audio_enabled = false;
896
897 if (dp->link->sink_count == 0) {
898 /*
899 * irq_hpd with sink_count = 0
900 * hdmi unplugged out of dongle
901 */
902 dp_ctrl_off_link_stream(dp->ctrl);
903 } else {
904 /*
905 * unplugged interrupt
906 * dongle unplugged out of DUT
907 */
908 dp_ctrl_off(dp->ctrl);
909 dp_display_host_phy_exit(dp);
910 }
911
912 dp_display->power_on = false;
913
914 drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
915 return 0;
916 }
917
dp_display_set_plugged_cb(struct msm_dp * dp_display,hdmi_codec_plugged_cb fn,struct device * codec_dev)918 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
919 hdmi_codec_plugged_cb fn, struct device *codec_dev)
920 {
921 bool plugged;
922
923 dp_display->plugged_cb = fn;
924 dp_display->codec_dev = codec_dev;
925 plugged = dp_display->is_connected;
926 dp_display_handle_plugged_change(dp_display, plugged);
927
928 return 0;
929 }
930
931 /**
932 * dp_bridge_mode_valid - callback to determine if specified mode is valid
933 * @bridge: Pointer to drm bridge structure
934 * @info: display info
935 * @mode: Pointer to drm mode structure
936 * Returns: Validity status for specified mode
937 */
dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)938 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
939 const struct drm_display_info *info,
940 const struct drm_display_mode *mode)
941 {
942 const u32 num_components = 3, default_bpp = 24;
943 struct dp_display_private *dp_display;
944 struct dp_link_info *link_info;
945 u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
946 struct msm_dp *dp;
947 int mode_pclk_khz = mode->clock;
948
949 dp = to_dp_bridge(bridge)->dp_display;
950
951 if (!dp || !mode_pclk_khz || !dp->connector) {
952 DRM_ERROR("invalid params\n");
953 return -EINVAL;
954 }
955
956 if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
957 return MODE_CLOCK_HIGH;
958
959 dp_display = container_of(dp, struct dp_display_private, dp_display);
960 link_info = &dp_display->panel->link_info;
961
962 mode_bpp = dp->connector->display_info.bpc * num_components;
963 if (!mode_bpp)
964 mode_bpp = default_bpp;
965
966 mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
967 mode_bpp, mode_pclk_khz);
968
969 mode_rate_khz = mode_pclk_khz * mode_bpp;
970 supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
971
972 if (mode_rate_khz > supported_rate_khz)
973 return MODE_BAD;
974
975 return MODE_OK;
976 }
977
dp_display_get_modes(struct msm_dp * dp)978 int dp_display_get_modes(struct msm_dp *dp)
979 {
980 struct dp_display_private *dp_display;
981
982 if (!dp) {
983 DRM_ERROR("invalid params\n");
984 return 0;
985 }
986
987 dp_display = container_of(dp, struct dp_display_private, dp_display);
988
989 return dp_panel_get_modes(dp_display->panel,
990 dp->connector);
991 }
992
dp_display_check_video_test(struct msm_dp * dp)993 bool dp_display_check_video_test(struct msm_dp *dp)
994 {
995 struct dp_display_private *dp_display;
996
997 dp_display = container_of(dp, struct dp_display_private, dp_display);
998
999 return dp_display->panel->video_test;
1000 }
1001
dp_display_get_test_bpp(struct msm_dp * dp)1002 int dp_display_get_test_bpp(struct msm_dp *dp)
1003 {
1004 struct dp_display_private *dp_display;
1005
1006 if (!dp) {
1007 DRM_ERROR("invalid params\n");
1008 return 0;
1009 }
1010
1011 dp_display = container_of(dp, struct dp_display_private, dp_display);
1012
1013 return dp_link_bit_depth_to_bpp(
1014 dp_display->link->test_video.test_bit_depth);
1015 }
1016
msm_dp_snapshot(struct msm_disp_state * disp_state,struct msm_dp * dp)1017 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1018 {
1019 struct dp_display_private *dp_display;
1020
1021 dp_display = container_of(dp, struct dp_display_private, dp_display);
1022
1023 /*
1024 * if we are reading registers we need the link clocks to be on
1025 * however till DP cable is connected this will not happen as we
1026 * do not know the resolution to power up with. Hence check the
1027 * power_on status before dumping DP registers to avoid crash due
1028 * to unclocked access
1029 */
1030 mutex_lock(&dp_display->event_mutex);
1031
1032 if (!dp->power_on) {
1033 mutex_unlock(&dp_display->event_mutex);
1034 return;
1035 }
1036
1037 dp_catalog_snapshot(dp_display->catalog, disp_state);
1038
1039 mutex_unlock(&dp_display->event_mutex);
1040 }
1041
dp_display_set_psr(struct msm_dp * dp_display,bool enter)1042 void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
1043 {
1044 struct dp_display_private *dp;
1045
1046 if (!dp_display) {
1047 DRM_ERROR("invalid params\n");
1048 return;
1049 }
1050
1051 dp = container_of(dp_display, struct dp_display_private, dp_display);
1052 dp_ctrl_set_psr(dp->ctrl, enter);
1053 }
1054
hpd_event_thread(void * data)1055 static int hpd_event_thread(void *data)
1056 {
1057 struct dp_display_private *dp_priv;
1058 unsigned long flag;
1059 struct dp_event *todo;
1060 int timeout_mode = 0;
1061
1062 dp_priv = (struct dp_display_private *)data;
1063
1064 while (1) {
1065 if (timeout_mode) {
1066 wait_event_timeout(dp_priv->event_q,
1067 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1068 kthread_should_stop(), EVENT_TIMEOUT);
1069 } else {
1070 wait_event_interruptible(dp_priv->event_q,
1071 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1072 kthread_should_stop());
1073 }
1074
1075 if (kthread_should_stop())
1076 break;
1077
1078 spin_lock_irqsave(&dp_priv->event_lock, flag);
1079 todo = &dp_priv->event_list[dp_priv->event_gndx];
1080 if (todo->delay) {
1081 struct dp_event *todo_next;
1082
1083 dp_priv->event_gndx++;
1084 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1085
1086 /* re enter delay event into q */
1087 todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1088 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1089 todo_next->event_id = todo->event_id;
1090 todo_next->data = todo->data;
1091 todo_next->delay = todo->delay - 1;
1092
1093 /* clean up older event */
1094 todo->event_id = EV_NO_EVENT;
1095 todo->delay = 0;
1096
1097 /* switch to timeout mode */
1098 timeout_mode = 1;
1099 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1100 continue;
1101 }
1102
1103 /* timeout with no events in q */
1104 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1105 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1106 continue;
1107 }
1108
1109 dp_priv->event_gndx++;
1110 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1111 timeout_mode = 0;
1112 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1113
1114 switch (todo->event_id) {
1115 case EV_HPD_INIT_SETUP:
1116 dp_display_host_init(dp_priv);
1117 break;
1118 case EV_HPD_PLUG_INT:
1119 dp_hpd_plug_handle(dp_priv, todo->data);
1120 break;
1121 case EV_HPD_UNPLUG_INT:
1122 dp_hpd_unplug_handle(dp_priv, todo->data);
1123 break;
1124 case EV_IRQ_HPD_INT:
1125 dp_irq_hpd_handle(dp_priv, todo->data);
1126 break;
1127 case EV_USER_NOTIFICATION:
1128 dp_display_send_hpd_notification(dp_priv,
1129 todo->data);
1130 break;
1131 default:
1132 break;
1133 }
1134 }
1135
1136 return 0;
1137 }
1138
dp_hpd_event_thread_start(struct dp_display_private * dp_priv)1139 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1140 {
1141 /* set event q to empty */
1142 dp_priv->event_gndx = 0;
1143 dp_priv->event_pndx = 0;
1144
1145 dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1146 if (IS_ERR(dp_priv->ev_tsk))
1147 return PTR_ERR(dp_priv->ev_tsk);
1148
1149 return 0;
1150 }
1151
dp_display_irq_handler(int irq,void * dev_id)1152 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1153 {
1154 struct dp_display_private *dp = dev_id;
1155 irqreturn_t ret = IRQ_NONE;
1156 u32 hpd_isr_status;
1157
1158 if (!dp) {
1159 DRM_ERROR("invalid data\n");
1160 return IRQ_NONE;
1161 }
1162
1163 hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1164
1165 if (hpd_isr_status & 0x0F) {
1166 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1167 dp->dp_display.connector_type, hpd_isr_status);
1168 /* hpd related interrupts */
1169 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1170 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1171
1172 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1173 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1174 }
1175
1176 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1177 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1178 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1179 }
1180
1181 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1182 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1183
1184 ret = IRQ_HANDLED;
1185 }
1186
1187 /* DP controller isr */
1188 ret |= dp_ctrl_isr(dp->ctrl);
1189
1190 /* DP aux isr */
1191 ret |= dp_aux_isr(dp->aux);
1192
1193 return ret;
1194 }
1195
dp_display_request_irq(struct msm_dp * dp_display)1196 int dp_display_request_irq(struct msm_dp *dp_display)
1197 {
1198 int rc = 0;
1199 struct dp_display_private *dp;
1200
1201 if (!dp_display) {
1202 DRM_ERROR("invalid input\n");
1203 return -EINVAL;
1204 }
1205
1206 dp = container_of(dp_display, struct dp_display_private, dp_display);
1207
1208 dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1209 if (!dp->irq) {
1210 DRM_ERROR("failed to get irq\n");
1211 return -EINVAL;
1212 }
1213
1214 rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
1215 dp_display_irq_handler,
1216 IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1217 if (rc < 0) {
1218 DRM_ERROR("failed to request IRQ%u: %d\n",
1219 dp->irq, rc);
1220 return rc;
1221 }
1222
1223 return 0;
1224 }
1225
dp_display_get_desc(struct platform_device * pdev)1226 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1227 {
1228 const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1229 struct resource *res;
1230 int i;
1231
1232 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1233 if (!res)
1234 return NULL;
1235
1236 for (i = 0; i < descs[i].io_start; i++) {
1237 if (descs[i].io_start == res->start)
1238 return &descs[i];
1239 }
1240
1241 dev_err(&pdev->dev, "unknown displayport instance\n");
1242 return NULL;
1243 }
1244
dp_display_probe(struct platform_device * pdev)1245 static int dp_display_probe(struct platform_device *pdev)
1246 {
1247 int rc = 0;
1248 struct dp_display_private *dp;
1249 const struct msm_dp_desc *desc;
1250
1251 if (!pdev || !pdev->dev.of_node) {
1252 DRM_ERROR("pdev not found\n");
1253 return -ENODEV;
1254 }
1255
1256 dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1257 if (!dp)
1258 return -ENOMEM;
1259
1260 desc = dp_display_get_desc(pdev);
1261 if (!desc)
1262 return -EINVAL;
1263
1264 dp->pdev = pdev;
1265 dp->name = "drm_dp";
1266 dp->id = desc->id;
1267 dp->dp_display.connector_type = desc->connector_type;
1268 dp->wide_bus_en = desc->wide_bus_en;
1269 dp->dp_display.is_edp =
1270 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1271
1272 rc = dp_init_sub_modules(dp);
1273 if (rc) {
1274 DRM_ERROR("init sub module failed\n");
1275 return -EPROBE_DEFER;
1276 }
1277
1278 /* setup event q */
1279 mutex_init(&dp->event_mutex);
1280 init_waitqueue_head(&dp->event_q);
1281 spin_lock_init(&dp->event_lock);
1282
1283 /* Store DP audio handle inside DP display */
1284 dp->dp_display.dp_audio = dp->audio;
1285
1286 init_completion(&dp->audio_comp);
1287
1288 platform_set_drvdata(pdev, &dp->dp_display);
1289
1290 rc = component_add(&pdev->dev, &dp_display_comp_ops);
1291 if (rc) {
1292 DRM_ERROR("component add failed, rc=%d\n", rc);
1293 dp_display_deinit_sub_modules(dp);
1294 }
1295
1296 return rc;
1297 }
1298
dp_display_remove(struct platform_device * pdev)1299 static int dp_display_remove(struct platform_device *pdev)
1300 {
1301 struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1302
1303 component_del(&pdev->dev, &dp_display_comp_ops);
1304 dp_display_deinit_sub_modules(dp);
1305
1306 platform_set_drvdata(pdev, NULL);
1307
1308 return 0;
1309 }
1310
dp_pm_resume(struct device * dev)1311 static int dp_pm_resume(struct device *dev)
1312 {
1313 struct platform_device *pdev = to_platform_device(dev);
1314 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1315 struct dp_display_private *dp;
1316 int sink_count = 0;
1317
1318 dp = container_of(dp_display, struct dp_display_private, dp_display);
1319
1320 mutex_lock(&dp->event_mutex);
1321
1322 drm_dbg_dp(dp->drm_dev,
1323 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1324 dp->dp_display.connector_type, dp->core_initialized,
1325 dp->phy_initialized, dp_display->power_on);
1326
1327 /* start from disconnected state */
1328 dp->hpd_state = ST_DISCONNECTED;
1329
1330 /* turn on dp ctrl/phy */
1331 dp_display_host_init(dp);
1332
1333 if (dp_display->is_edp)
1334 dp_catalog_ctrl_hpd_enable(dp->catalog);
1335
1336 if (dp_catalog_link_is_connected(dp->catalog)) {
1337 /*
1338 * set sink to normal operation mode -- D0
1339 * before dpcd read
1340 */
1341 dp_display_host_phy_init(dp);
1342 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1343 sink_count = drm_dp_read_sink_count(dp->aux);
1344 if (sink_count < 0)
1345 sink_count = 0;
1346
1347 dp_display_host_phy_exit(dp);
1348 }
1349
1350 dp->link->sink_count = sink_count;
1351 /*
1352 * can not declared display is connected unless
1353 * HDMI cable is plugged in and sink_count of
1354 * dongle become 1
1355 * also only signal audio when disconnected
1356 */
1357 if (dp->link->sink_count) {
1358 dp->dp_display.is_connected = true;
1359 } else {
1360 dp->dp_display.is_connected = false;
1361 dp_display_handle_plugged_change(dp_display, false);
1362 }
1363
1364 drm_dbg_dp(dp->drm_dev,
1365 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1366 dp->dp_display.connector_type, dp->link->sink_count,
1367 dp->dp_display.is_connected, dp->core_initialized,
1368 dp->phy_initialized, dp_display->power_on);
1369
1370 mutex_unlock(&dp->event_mutex);
1371
1372 return 0;
1373 }
1374
dp_pm_suspend(struct device * dev)1375 static int dp_pm_suspend(struct device *dev)
1376 {
1377 struct platform_device *pdev = to_platform_device(dev);
1378 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1379 struct dp_display_private *dp;
1380
1381 dp = container_of(dp_display, struct dp_display_private, dp_display);
1382
1383 mutex_lock(&dp->event_mutex);
1384
1385 drm_dbg_dp(dp->drm_dev,
1386 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1387 dp->dp_display.connector_type, dp->core_initialized,
1388 dp->phy_initialized, dp_display->power_on);
1389
1390 /* mainlink enabled */
1391 if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1392 dp_ctrl_off_link_stream(dp->ctrl);
1393
1394 dp_display_host_phy_exit(dp);
1395
1396 /* host_init will be called at pm_resume */
1397 dp_display_host_deinit(dp);
1398
1399 dp->hpd_state = ST_SUSPENDED;
1400
1401 drm_dbg_dp(dp->drm_dev,
1402 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1403 dp->dp_display.connector_type, dp->core_initialized,
1404 dp->phy_initialized, dp_display->power_on);
1405
1406 mutex_unlock(&dp->event_mutex);
1407
1408 return 0;
1409 }
1410
1411 static const struct dev_pm_ops dp_pm_ops = {
1412 .suspend = dp_pm_suspend,
1413 .resume = dp_pm_resume,
1414 };
1415
1416 static struct platform_driver dp_display_driver = {
1417 .probe = dp_display_probe,
1418 .remove = dp_display_remove,
1419 .driver = {
1420 .name = "msm-dp-display",
1421 .of_match_table = dp_dt_match,
1422 .suppress_bind_attrs = true,
1423 .pm = &dp_pm_ops,
1424 },
1425 };
1426
msm_dp_register(void)1427 int __init msm_dp_register(void)
1428 {
1429 int ret;
1430
1431 ret = platform_driver_register(&dp_display_driver);
1432 if (ret)
1433 DRM_ERROR("Dp display driver register failed");
1434
1435 return ret;
1436 }
1437
msm_dp_unregister(void)1438 void __exit msm_dp_unregister(void)
1439 {
1440 platform_driver_unregister(&dp_display_driver);
1441 }
1442
msm_dp_irq_postinstall(struct msm_dp * dp_display)1443 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1444 {
1445 struct dp_display_private *dp;
1446
1447 if (!dp_display)
1448 return;
1449
1450 dp = container_of(dp_display, struct dp_display_private, dp_display);
1451
1452 if (!dp_display->is_edp)
1453 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
1454 }
1455
msm_dp_wide_bus_available(const struct msm_dp * dp_display)1456 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1457 {
1458 struct dp_display_private *dp;
1459
1460 dp = container_of(dp_display, struct dp_display_private, dp_display);
1461
1462 return dp->wide_bus_en;
1463 }
1464
msm_dp_debugfs_init(struct msm_dp * dp_display,struct drm_minor * minor)1465 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1466 {
1467 struct dp_display_private *dp;
1468 struct device *dev;
1469 int rc;
1470
1471 dp = container_of(dp_display, struct dp_display_private, dp_display);
1472 dev = &dp->pdev->dev;
1473
1474 dp->debug = dp_debug_get(dev, dp->panel,
1475 dp->link, dp->dp_display.connector,
1476 minor);
1477 if (IS_ERR(dp->debug)) {
1478 rc = PTR_ERR(dp->debug);
1479 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1480 dp->debug = NULL;
1481 }
1482 }
1483
dp_display_get_next_bridge(struct msm_dp * dp)1484 static int dp_display_get_next_bridge(struct msm_dp *dp)
1485 {
1486 int rc;
1487 struct dp_display_private *dp_priv;
1488 struct device_node *aux_bus;
1489 struct device *dev;
1490
1491 dp_priv = container_of(dp, struct dp_display_private, dp_display);
1492 dev = &dp_priv->pdev->dev;
1493 aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1494
1495 if (aux_bus && dp->is_edp) {
1496 dp_display_host_init(dp_priv);
1497 dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
1498 dp_display_host_phy_init(dp_priv);
1499
1500 /*
1501 * The code below assumes that the panel will finish probing
1502 * by the time devm_of_dp_aux_populate_ep_devices() returns.
1503 * This isn't a great assumption since it will fail if the
1504 * panel driver is probed asynchronously but is the best we
1505 * can do without a bigger driver reorganization.
1506 */
1507 rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
1508 of_node_put(aux_bus);
1509 if (rc)
1510 goto error;
1511 } else if (dp->is_edp) {
1512 DRM_ERROR("eDP aux_bus not found\n");
1513 return -ENODEV;
1514 }
1515
1516 /*
1517 * External bridges are mandatory for eDP interfaces: one has to
1518 * provide at least an eDP panel (which gets wrapped into panel-bridge).
1519 *
1520 * For DisplayPort interfaces external bridges are optional, so
1521 * silently ignore an error if one is not present (-ENODEV).
1522 */
1523 rc = devm_dp_parser_find_next_bridge(dp->drm_dev->dev, dp_priv->parser);
1524 if (!dp->is_edp && rc == -ENODEV)
1525 return 0;
1526
1527 if (!rc) {
1528 dp->next_bridge = dp_priv->parser->next_bridge;
1529 return 0;
1530 }
1531
1532 error:
1533 if (dp->is_edp) {
1534 of_dp_aux_depopulate_bus(dp_priv->aux);
1535 dp_display_host_phy_exit(dp_priv);
1536 dp_display_host_deinit(dp_priv);
1537 }
1538 return rc;
1539 }
1540
msm_dp_modeset_init(struct msm_dp * dp_display,struct drm_device * dev,struct drm_encoder * encoder)1541 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1542 struct drm_encoder *encoder)
1543 {
1544 struct msm_drm_private *priv = dev->dev_private;
1545 struct dp_display_private *dp_priv;
1546 int ret;
1547
1548 dp_display->drm_dev = dev;
1549
1550 dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1551
1552 ret = dp_display_request_irq(dp_display);
1553 if (ret) {
1554 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1555 return ret;
1556 }
1557
1558 ret = dp_display_get_next_bridge(dp_display);
1559 if (ret)
1560 return ret;
1561
1562 dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1563 if (IS_ERR(dp_display->bridge)) {
1564 ret = PTR_ERR(dp_display->bridge);
1565 DRM_DEV_ERROR(dev->dev,
1566 "failed to create dp bridge: %d\n", ret);
1567 dp_display->bridge = NULL;
1568 return ret;
1569 }
1570
1571 priv->bridges[priv->num_bridges++] = dp_display->bridge;
1572
1573 dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1574 if (IS_ERR(dp_display->connector)) {
1575 ret = PTR_ERR(dp_display->connector);
1576 DRM_DEV_ERROR(dev->dev,
1577 "failed to create dp connector: %d\n", ret);
1578 dp_display->connector = NULL;
1579 return ret;
1580 }
1581
1582 dp_priv->panel->connector = dp_display->connector;
1583
1584 return 0;
1585 }
1586
dp_bridge_atomic_enable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1587 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1588 struct drm_bridge_state *old_bridge_state)
1589 {
1590 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1591 struct msm_dp *dp = dp_bridge->dp_display;
1592 int rc = 0;
1593 struct dp_display_private *dp_display;
1594 u32 state;
1595 bool force_link_train = false;
1596
1597 dp_display = container_of(dp, struct dp_display_private, dp_display);
1598 if (!dp_display->dp_mode.drm_mode.clock) {
1599 DRM_ERROR("invalid params\n");
1600 return;
1601 }
1602
1603 if (dp->is_edp)
1604 dp_hpd_plug_handle(dp_display, 0);
1605
1606 mutex_lock(&dp_display->event_mutex);
1607
1608 state = dp_display->hpd_state;
1609 if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1610 mutex_unlock(&dp_display->event_mutex);
1611 return;
1612 }
1613
1614 rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1615 if (rc) {
1616 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1617 mutex_unlock(&dp_display->event_mutex);
1618 return;
1619 }
1620
1621 state = dp_display->hpd_state;
1622
1623 if (state == ST_DISPLAY_OFF) {
1624 dp_display_host_phy_init(dp_display);
1625 force_link_train = true;
1626 }
1627
1628 dp_display_enable(dp_display, force_link_train);
1629
1630 rc = dp_display_post_enable(dp);
1631 if (rc) {
1632 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1633 dp_display_disable(dp_display);
1634 }
1635
1636 /* completed connection */
1637 dp_display->hpd_state = ST_CONNECTED;
1638
1639 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1640 mutex_unlock(&dp_display->event_mutex);
1641 }
1642
dp_bridge_atomic_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1643 void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1644 struct drm_bridge_state *old_bridge_state)
1645 {
1646 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1647 struct msm_dp *dp = dp_bridge->dp_display;
1648 struct dp_display_private *dp_display;
1649
1650 dp_display = container_of(dp, struct dp_display_private, dp_display);
1651
1652 dp_ctrl_push_idle(dp_display->ctrl);
1653 }
1654
dp_bridge_atomic_post_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1655 void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1656 struct drm_bridge_state *old_bridge_state)
1657 {
1658 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1659 struct msm_dp *dp = dp_bridge->dp_display;
1660 u32 state;
1661 struct dp_display_private *dp_display;
1662
1663 dp_display = container_of(dp, struct dp_display_private, dp_display);
1664
1665 if (dp->is_edp)
1666 dp_hpd_unplug_handle(dp_display, 0);
1667
1668 mutex_lock(&dp_display->event_mutex);
1669
1670 state = dp_display->hpd_state;
1671 if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1672 mutex_unlock(&dp_display->event_mutex);
1673 return;
1674 }
1675
1676 dp_display_disable(dp_display);
1677
1678 state = dp_display->hpd_state;
1679 if (state == ST_DISCONNECT_PENDING) {
1680 /* completed disconnection */
1681 dp_display->hpd_state = ST_DISCONNECTED;
1682 } else {
1683 dp_display->hpd_state = ST_DISPLAY_OFF;
1684 }
1685
1686 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1687 mutex_unlock(&dp_display->event_mutex);
1688 }
1689
dp_bridge_mode_set(struct drm_bridge * drm_bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)1690 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1691 const struct drm_display_mode *mode,
1692 const struct drm_display_mode *adjusted_mode)
1693 {
1694 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1695 struct msm_dp *dp = dp_bridge->dp_display;
1696 struct dp_display_private *dp_display;
1697
1698 dp_display = container_of(dp, struct dp_display_private, dp_display);
1699
1700 memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1701
1702 if (dp_display_check_video_test(dp))
1703 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1704 else /* Default num_components per pixel = 3 */
1705 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1706
1707 if (!dp_display->dp_mode.bpp)
1708 dp_display->dp_mode.bpp = 24; /* Default bpp */
1709
1710 drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1711
1712 dp_display->dp_mode.v_active_low =
1713 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1714
1715 dp_display->dp_mode.h_active_low =
1716 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1717 }
1718
dp_bridge_hpd_enable(struct drm_bridge * bridge)1719 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1720 {
1721 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1722 struct msm_dp *dp_display = dp_bridge->dp_display;
1723 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1724
1725 mutex_lock(&dp->event_mutex);
1726 dp_catalog_ctrl_hpd_enable(dp->catalog);
1727
1728 /* enable HDP interrupts */
1729 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1730
1731 dp_display->internal_hpd = true;
1732 mutex_unlock(&dp->event_mutex);
1733 }
1734
dp_bridge_hpd_disable(struct drm_bridge * bridge)1735 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1736 {
1737 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1738 struct msm_dp *dp_display = dp_bridge->dp_display;
1739 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1740
1741 mutex_lock(&dp->event_mutex);
1742 /* disable HDP interrupts */
1743 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1744 dp_catalog_ctrl_hpd_disable(dp->catalog);
1745
1746 dp_display->internal_hpd = false;
1747 mutex_unlock(&dp->event_mutex);
1748 }
1749
dp_bridge_hpd_notify(struct drm_bridge * bridge,enum drm_connector_status status)1750 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1751 enum drm_connector_status status)
1752 {
1753 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1754 struct msm_dp *dp_display = dp_bridge->dp_display;
1755 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1756
1757 /* Without next_bridge interrupts are handled by the DP core directly */
1758 if (dp_display->internal_hpd)
1759 return;
1760
1761 if (!dp->core_initialized) {
1762 drm_dbg_dp(dp->drm_dev, "not initialized\n");
1763 return;
1764 }
1765
1766 if (!dp_display->is_connected && status == connector_status_connected)
1767 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1768 else if (dp_display->is_connected && status == connector_status_disconnected)
1769 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1770 }
1771
