1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/module.h>
7 #include <linux/slab.h>
8 #include <linux/uaccess.h>
9 #include <linux/debugfs.h>
10 #include <linux/component.h>
11 #include <linux/of_irq.h>
12 #include <linux/delay.h>
13 #include <drm/display/drm_dp_aux_bus.h>
14
15 #include "msm_drv.h"
16 #include "msm_kms.h"
17 #include "dp_hpd.h"
18 #include "dp_parser.h"
19 #include "dp_power.h"
20 #include "dp_catalog.h"
21 #include "dp_aux.h"
22 #include "dp_reg.h"
23 #include "dp_link.h"
24 #include "dp_panel.h"
25 #include "dp_ctrl.h"
26 #include "dp_display.h"
27 #include "dp_drm.h"
28 #include "dp_audio.h"
29 #include "dp_debug.h"
30
31 #define HPD_STRING_SIZE 30
32
33 enum {
34 ISR_DISCONNECTED,
35 ISR_CONNECT_PENDING,
36 ISR_CONNECTED,
37 ISR_HPD_REPLUG_COUNT,
38 ISR_IRQ_HPD_PULSE_COUNT,
39 ISR_HPD_LO_GLITH_COUNT,
40 };
41
42 /* event thread connection state */
43 enum {
44 ST_DISCONNECTED,
45 ST_MAINLINK_READY,
46 ST_CONNECTED,
47 ST_DISCONNECT_PENDING,
48 ST_DISPLAY_OFF,
49 ST_SUSPENDED,
50 };
51
52 enum {
53 EV_NO_EVENT,
54 /* hpd events */
55 EV_HPD_INIT_SETUP,
56 EV_HPD_PLUG_INT,
57 EV_IRQ_HPD_INT,
58 EV_HPD_UNPLUG_INT,
59 EV_USER_NOTIFICATION,
60 };
61
62 #define EVENT_TIMEOUT (HZ/10) /* 100ms */
63 #define DP_EVENT_Q_MAX 8
64
65 #define DP_TIMEOUT_NONE 0
66
67 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
68
69 struct dp_event {
70 u32 event_id;
71 u32 data;
72 u32 delay;
73 };
74
75 struct dp_display_private {
76 char *name;
77 int irq;
78
79 unsigned int id;
80
81 /* state variables */
82 bool core_initialized;
83 bool phy_initialized;
84 bool hpd_irq_on;
85 bool audio_supported;
86
87 struct drm_device *drm_dev;
88 struct platform_device *pdev;
89 struct dentry *root;
90
91 struct dp_usbpd *usbpd;
92 struct dp_parser *parser;
93 struct dp_power *power;
94 struct dp_catalog *catalog;
95 struct drm_dp_aux *aux;
96 struct dp_link *link;
97 struct dp_panel *panel;
98 struct dp_ctrl *ctrl;
99 struct dp_debug *debug;
100
101 struct dp_usbpd_cb usbpd_cb;
102 struct dp_display_mode dp_mode;
103 struct msm_dp dp_display;
104
105 /* wait for audio signaling */
106 struct completion audio_comp;
107
108 /* event related only access by event thread */
109 struct mutex event_mutex;
110 wait_queue_head_t event_q;
111 u32 hpd_state;
112 u32 event_pndx;
113 u32 event_gndx;
114 struct task_struct *ev_tsk;
115 struct dp_event event_list[DP_EVENT_Q_MAX];
116 spinlock_t event_lock;
117
118 bool wide_bus_en;
119
120 struct dp_audio *audio;
121 };
122
123 struct msm_dp_desc {
124 phys_addr_t io_start;
125 unsigned int id;
126 unsigned int connector_type;
127 bool wide_bus_en;
128 };
129
130 static const struct msm_dp_desc sc7180_dp_descs[] = {
131 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
132 {}
133 };
134
135 static const struct msm_dp_desc sc7280_dp_descs[] = {
136 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
137 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
138 {}
139 };
140
141 static const struct msm_dp_desc sc8180x_dp_descs[] = {
142 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
143 { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
144 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP },
145 {}
146 };
147
148 static const struct msm_dp_desc sc8280xp_dp_descs[] = {
149 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
150 { .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
151 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
152 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
153 { .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
154 { .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
155 { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
156 { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
157 {}
158 };
159
160 static const struct msm_dp_desc sc8280xp_edp_descs[] = {
161 { .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
162 { .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
163 { .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
164 { .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
165 {}
166 };
167
168 static const struct msm_dp_desc sm8350_dp_descs[] = {
169 { .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
170 {}
171 };
172
173 static const struct of_device_id dp_dt_match[] = {
174 { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
175 { .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
176 { .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
177 { .compatible = "qcom,sc8180x-dp", .data = &sc8180x_dp_descs },
178 { .compatible = "qcom,sc8180x-edp", .data = &sc8180x_dp_descs },
179 { .compatible = "qcom,sc8280xp-dp", .data = &sc8280xp_dp_descs },
180 { .compatible = "qcom,sc8280xp-edp", .data = &sc8280xp_edp_descs },
181 { .compatible = "qcom,sdm845-dp", .data = &sc7180_dp_descs },
182 { .compatible = "qcom,sm8350-dp", .data = &sm8350_dp_descs },
183 {}
184 };
185
dev_get_dp_display_private(struct device * dev)186 static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
187 {
188 struct msm_dp *dp = dev_get_drvdata(dev);
189
190 return container_of(dp, struct dp_display_private, dp_display);
191 }
192
dp_add_event(struct dp_display_private * dp_priv,u32 event,u32 data,u32 delay)193 static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
194 u32 data, u32 delay)
195 {
196 unsigned long flag;
197 struct dp_event *todo;
198 int pndx;
199
200 spin_lock_irqsave(&dp_priv->event_lock, flag);
201 pndx = dp_priv->event_pndx + 1;
202 pndx %= DP_EVENT_Q_MAX;
203 if (pndx == dp_priv->event_gndx) {
204 pr_err("event_q is full: pndx=%d gndx=%d\n",
205 dp_priv->event_pndx, dp_priv->event_gndx);
206 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
207 return -EPERM;
208 }
209 todo = &dp_priv->event_list[dp_priv->event_pndx++];
210 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
211 todo->event_id = event;
212 todo->data = data;
213 todo->delay = delay;
214 wake_up(&dp_priv->event_q);
215 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
216
217 return 0;
218 }
219
dp_del_event(struct dp_display_private * dp_priv,u32 event)220 static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
221 {
222 unsigned long flag;
223 struct dp_event *todo;
224 u32 gndx;
225
226 spin_lock_irqsave(&dp_priv->event_lock, flag);
227 if (dp_priv->event_pndx == dp_priv->event_gndx) {
228 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
229 return -ENOENT;
230 }
231
232 gndx = dp_priv->event_gndx;
233 while (dp_priv->event_pndx != gndx) {
234 todo = &dp_priv->event_list[gndx];
235 if (todo->event_id == event) {
236 todo->event_id = EV_NO_EVENT; /* deleted */
237 todo->delay = 0;
238 }
239 gndx++;
240 gndx %= DP_EVENT_Q_MAX;
241 }
242 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
243
244 return 0;
245 }
246
dp_display_signal_audio_start(struct msm_dp * dp_display)247 void dp_display_signal_audio_start(struct msm_dp *dp_display)
248 {
249 struct dp_display_private *dp;
250
251 dp = container_of(dp_display, struct dp_display_private, dp_display);
252
253 reinit_completion(&dp->audio_comp);
254 }
255
dp_display_signal_audio_complete(struct msm_dp * dp_display)256 void dp_display_signal_audio_complete(struct msm_dp *dp_display)
257 {
258 struct dp_display_private *dp;
259
260 dp = container_of(dp_display, struct dp_display_private, dp_display);
261
262 complete_all(&dp->audio_comp);
263 }
264
265 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
266
dp_display_bind(struct device * dev,struct device * master,void * data)267 static int dp_display_bind(struct device *dev, struct device *master,
268 void *data)
269 {
270 int rc = 0;
271 struct dp_display_private *dp = dev_get_dp_display_private(dev);
272 struct msm_drm_private *priv = dev_get_drvdata(master);
273 struct drm_device *drm = priv->dev;
274
275 dp->dp_display.drm_dev = drm;
276 priv->dp[dp->id] = &dp->dp_display;
277
278 rc = dp->parser->parse(dp->parser);
279 if (rc) {
280 DRM_ERROR("device tree parsing failed\n");
281 goto end;
282 }
283
284
285 dp->drm_dev = drm;
286 dp->aux->drm_dev = drm;
287 rc = dp_aux_register(dp->aux);
288 if (rc) {
289 DRM_ERROR("DRM DP AUX register failed\n");
290 goto end;
291 }
292
293 rc = dp_power_client_init(dp->power);
294 if (rc) {
295 DRM_ERROR("Power client create failed\n");
296 goto end;
297 }
298
299 rc = dp_register_audio_driver(dev, dp->audio);
300 if (rc) {
301 DRM_ERROR("Audio registration Dp failed\n");
302 goto end;
303 }
304
305 rc = dp_hpd_event_thread_start(dp);
306 if (rc) {
307 DRM_ERROR("Event thread create failed\n");
308 goto end;
309 }
310
311 return 0;
312 end:
313 return rc;
314 }
315
dp_display_unbind(struct device * dev,struct device * master,void * data)316 static void dp_display_unbind(struct device *dev, struct device *master,
317 void *data)
318 {
319 struct dp_display_private *dp = dev_get_dp_display_private(dev);
320 struct msm_drm_private *priv = dev_get_drvdata(master);
321
322 /* disable all HPD interrupts */
323 if (dp->core_initialized)
324 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
325
326 kthread_stop(dp->ev_tsk);
327
328 dp_power_client_deinit(dp->power);
329 dp_aux_unregister(dp->aux);
330 dp->drm_dev = NULL;
331 dp->aux->drm_dev = NULL;
332 priv->dp[dp->id] = NULL;
333 }
334
335 static const struct component_ops dp_display_comp_ops = {
336 .bind = dp_display_bind,
337 .unbind = dp_display_unbind,
338 };
339
dp_display_is_ds_bridge(struct dp_panel * panel)340 static bool dp_display_is_ds_bridge(struct dp_panel *panel)
341 {
342 return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
343 DP_DWN_STRM_PORT_PRESENT);
344 }
345
dp_display_is_sink_count_zero(struct dp_display_private * dp)346 static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
347 {
348 drm_dbg_dp(dp->drm_dev, "present=%#x sink_count=%d\n",
349 dp->panel->dpcd[DP_DOWNSTREAMPORT_PRESENT],
350 dp->link->sink_count);
351 return dp_display_is_ds_bridge(dp->panel) &&
352 (dp->link->sink_count == 0);
353 }
354
dp_display_send_hpd_event(struct msm_dp * dp_display)355 static void dp_display_send_hpd_event(struct msm_dp *dp_display)
356 {
357 struct dp_display_private *dp;
358 struct drm_connector *connector;
359
360 dp = container_of(dp_display, struct dp_display_private, dp_display);
361
362 connector = dp->dp_display.connector;
363 drm_helper_hpd_irq_event(connector->dev);
364 }
365
366
dp_display_send_hpd_notification(struct dp_display_private * dp,bool hpd)367 static int dp_display_send_hpd_notification(struct dp_display_private *dp,
368 bool hpd)
369 {
370 if ((hpd && dp->dp_display.is_connected) ||
371 (!hpd && !dp->dp_display.is_connected)) {
372 drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
373 (hpd ? "on" : "off"));
374 return 0;
375 }
376
377 /* reset video pattern flag on disconnect */
378 if (!hpd)
379 dp->panel->video_test = false;
380
381 dp->dp_display.is_connected = hpd;
382
383 drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
384 dp->dp_display.connector_type, hpd);
385 dp_display_send_hpd_event(&dp->dp_display);
386
387 return 0;
388 }
389
dp_display_process_hpd_high(struct dp_display_private * dp)390 static int dp_display_process_hpd_high(struct dp_display_private *dp)
391 {
392 int rc = 0;
393 struct edid *edid;
394
395 dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
396 dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
397
398 drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
399 dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);
400
401 rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
402 if (rc)
403 goto end;
404
405 dp_link_process_request(dp->link);
406
407 edid = dp->panel->edid;
408
409 dp->audio_supported = drm_detect_monitor_audio(edid);
410 dp_panel_handle_sink_request(dp->panel);
411
412 dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
413
414 /*
415 * set sink to normal operation mode -- D0
416 * before dpcd read
417 */
418 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
419
420 dp_link_reset_phy_params_vx_px(dp->link);
421 rc = dp_ctrl_on_link(dp->ctrl);
422 if (rc) {
423 DRM_ERROR("failed to complete DP link training\n");
424 goto end;
425 }
426
427 dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
428
429 end:
430 return rc;
431 }
432
dp_display_host_phy_init(struct dp_display_private * dp)433 static void dp_display_host_phy_init(struct dp_display_private *dp)
434 {
435 drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
436 dp->dp_display.connector_type, dp->core_initialized,
437 dp->phy_initialized);
438
439 if (!dp->phy_initialized) {
440 dp_ctrl_phy_init(dp->ctrl);
441 dp->phy_initialized = true;
442 }
443 }
444
dp_display_host_phy_exit(struct dp_display_private * dp)445 static void dp_display_host_phy_exit(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_exit(dp->ctrl);
453 dp->phy_initialized = false;
454 }
455 }
456
dp_display_host_init(struct dp_display_private * dp)457 static void dp_display_host_init(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 dp_power_init(dp->power, false);
464 dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
465 dp_aux_init(dp->aux);
466 dp->core_initialized = true;
467 }
468
dp_display_host_deinit(struct dp_display_private * dp)469 static void dp_display_host_deinit(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_ctrl_reset_irq_ctrl(dp->ctrl, false);
476 dp_aux_deinit(dp->aux);
477 dp_power_deinit(dp->power);
478 dp->core_initialized = false;
479 }
480
dp_display_usbpd_configure_cb(struct device * dev)481 static int dp_display_usbpd_configure_cb(struct device *dev)
482 {
483 struct dp_display_private *dp = dev_get_dp_display_private(dev);
484
485 dp_display_host_phy_init(dp);
486
487 return dp_display_process_hpd_high(dp);
488 }
489
dp_display_usbpd_disconnect_cb(struct device * dev)490 static int dp_display_usbpd_disconnect_cb(struct device *dev)
491 {
492 return 0;
493 }
494
dp_display_notify_disconnect(struct device * dev)495 static int dp_display_notify_disconnect(struct device *dev)
496 {
497 struct dp_display_private *dp = dev_get_dp_display_private(dev);
498
499 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
500
501 return 0;
502 }
503
dp_display_handle_video_request(struct dp_display_private * dp)504 static void dp_display_handle_video_request(struct dp_display_private *dp)
505 {
506 if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
507 dp->panel->video_test = true;
508 dp_link_send_test_response(dp->link);
509 }
510 }
511
dp_display_handle_port_ststus_changed(struct dp_display_private * dp)512 static int dp_display_handle_port_ststus_changed(struct dp_display_private *dp)
513 {
514 int rc = 0;
515
516 if (dp_display_is_sink_count_zero(dp)) {
517 drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
518 if (dp->hpd_state != ST_DISCONNECTED) {
519 dp->hpd_state = ST_DISCONNECT_PENDING;
520 dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
521 }
522 } else {
523 if (dp->hpd_state == ST_DISCONNECTED) {
524 dp->hpd_state = ST_MAINLINK_READY;
525 rc = dp_display_process_hpd_high(dp);
526 if (rc)
527 dp->hpd_state = ST_DISCONNECTED;
528 }
529 }
530
531 return rc;
532 }
533
dp_display_handle_irq_hpd(struct dp_display_private * dp)534 static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
535 {
536 u32 sink_request = dp->link->sink_request;
537
538 drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
539 if (dp->hpd_state == ST_DISCONNECTED) {
540 if (sink_request & DP_LINK_STATUS_UPDATED) {
541 drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
542 sink_request);
543 DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
544 return -EINVAL;
545 }
546 }
547
548 dp_ctrl_handle_sink_request(dp->ctrl);
549
550 if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
551 dp_display_handle_video_request(dp);
552
553 return 0;
554 }
555
dp_display_usbpd_attention_cb(struct device * dev)556 static int dp_display_usbpd_attention_cb(struct device *dev)
557 {
558 int rc = 0;
559 u32 sink_request;
560 struct dp_display_private *dp = dev_get_dp_display_private(dev);
561
562 /* check for any test request issued by sink */
563 rc = dp_link_process_request(dp->link);
564 if (!rc) {
565 sink_request = dp->link->sink_request;
566 drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
567 dp->hpd_state, sink_request);
568 if (sink_request & DS_PORT_STATUS_CHANGED)
569 rc = dp_display_handle_port_ststus_changed(dp);
570 else
571 rc = dp_display_handle_irq_hpd(dp);
572 }
573
574 return rc;
575 }
576
dp_hpd_plug_handle(struct dp_display_private * dp,u32 data)577 static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
578 {
579 struct dp_usbpd *hpd = dp->usbpd;
580 u32 state;
581 int ret;
582
583 if (!hpd)
584 return 0;
585
586 mutex_lock(&dp->event_mutex);
587
588 state = dp->hpd_state;
589 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
590 dp->dp_display.connector_type, state);
591
592 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
593 mutex_unlock(&dp->event_mutex);
594 return 0;
595 }
596
597 if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
598 mutex_unlock(&dp->event_mutex);
599 return 0;
600 }
601
602 if (state == ST_DISCONNECT_PENDING) {
603 /* wait until ST_DISCONNECTED */
604 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
605 mutex_unlock(&dp->event_mutex);
606 return 0;
607 }
608
609 ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
610 if (ret) { /* link train failed */
611 dp->hpd_state = ST_DISCONNECTED;
612 } else {
613 dp->hpd_state = ST_MAINLINK_READY;
614 }
615
616 /* enable HDP irq_hpd/replug interrupt */
617 if (dp->dp_display.internal_hpd)
618 dp_catalog_hpd_config_intr(dp->catalog,
619 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
620 true);
621
622 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
623 dp->dp_display.connector_type, state);
624 mutex_unlock(&dp->event_mutex);
625
626 /* uevent will complete connection part */
627 return 0;
628 };
629
dp_display_handle_plugged_change(struct msm_dp * dp_display,bool plugged)630 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
631 bool plugged)
632 {
633 struct dp_display_private *dp;
634
635 dp = container_of(dp_display,
636 struct dp_display_private, dp_display);
637
638 /* notify audio subsystem only if sink supports audio */
639 if (dp_display->plugged_cb && dp_display->codec_dev &&
640 dp->audio_supported)
641 dp_display->plugged_cb(dp_display->codec_dev, plugged);
642 }
643
dp_hpd_unplug_handle(struct dp_display_private * dp,u32 data)644 static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
645 {
646 struct dp_usbpd *hpd = dp->usbpd;
647 u32 state;
648
649 if (!hpd)
650 return 0;
651
652 mutex_lock(&dp->event_mutex);
653
654 state = dp->hpd_state;
655
656 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
657 dp->dp_display.connector_type, state);
658
659 /* disable irq_hpd/replug interrupts */
660 if (dp->dp_display.internal_hpd)
661 dp_catalog_hpd_config_intr(dp->catalog,
662 DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
663 false);
664
665 /* unplugged, no more irq_hpd handle */
666 dp_del_event(dp, EV_IRQ_HPD_INT);
667
668 if (state == ST_DISCONNECTED) {
669 /* triggered by irq_hdp with sink_count = 0 */
670 if (dp->link->sink_count == 0) {
671 dp_display_host_phy_exit(dp);
672 }
673 dp_display_notify_disconnect(&dp->pdev->dev);
674 mutex_unlock(&dp->event_mutex);
675 return 0;
676 } else if (state == ST_DISCONNECT_PENDING) {
677 mutex_unlock(&dp->event_mutex);
678 return 0;
679 } else if (state == ST_MAINLINK_READY) {
680 dp_ctrl_off_link(dp->ctrl);
681 dp_display_host_phy_exit(dp);
682 dp->hpd_state = ST_DISCONNECTED;
683 dp_display_notify_disconnect(&dp->pdev->dev);
684 mutex_unlock(&dp->event_mutex);
685 return 0;
686 }
687
688 /* disable HPD plug interrupts */
689 if (dp->dp_display.internal_hpd)
690 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
691
692 /*
693 * We don't need separate work for disconnect as
694 * connect/attention interrupts are disabled
695 */
696 dp_display_notify_disconnect(&dp->pdev->dev);
697
698 if (state == ST_DISPLAY_OFF) {
699 dp->hpd_state = ST_DISCONNECTED;
700 } else {
701 dp->hpd_state = ST_DISCONNECT_PENDING;
702 }
703
704 /* signal the disconnect event early to ensure proper teardown */
705 dp_display_handle_plugged_change(&dp->dp_display, false);
706
707 /* enable HDP plug interrupt to prepare for next plugin */
708 if (dp->dp_display.internal_hpd)
709 dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
710
711 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
712 dp->dp_display.connector_type, state);
713
714 /* uevent will complete disconnection part */
715 mutex_unlock(&dp->event_mutex);
716 return 0;
717 }
718
dp_irq_hpd_handle(struct dp_display_private * dp,u32 data)719 static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
720 {
721 u32 state;
722
723 mutex_lock(&dp->event_mutex);
724
725 /* irq_hpd can happen at either connected or disconnected state */
726 state = dp->hpd_state;
727 drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
728 dp->dp_display.connector_type, state);
729
730 if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
731 mutex_unlock(&dp->event_mutex);
732 return 0;
733 }
734
735 if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
736 /* wait until ST_CONNECTED */
737 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
738 mutex_unlock(&dp->event_mutex);
739 return 0;
740 }
741
742 dp_display_usbpd_attention_cb(&dp->pdev->dev);
743
744 drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
745 dp->dp_display.connector_type, state);
746
747 mutex_unlock(&dp->event_mutex);
748
749 return 0;
750 }
751
dp_display_deinit_sub_modules(struct dp_display_private * dp)752 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
753 {
754 dp_debug_put(dp->debug);
755 dp_audio_put(dp->audio);
756 dp_panel_put(dp->panel);
757 dp_aux_put(dp->aux);
758 }
759
dp_init_sub_modules(struct dp_display_private * dp)760 static int dp_init_sub_modules(struct dp_display_private *dp)
761 {
762 int rc = 0;
763 struct device *dev = &dp->pdev->dev;
764 struct dp_usbpd_cb *cb = &dp->usbpd_cb;
765 struct dp_panel_in panel_in = {
766 .dev = dev,
767 };
768
769 /* Callback APIs used for cable status change event */
770 cb->configure = dp_display_usbpd_configure_cb;
771 cb->disconnect = dp_display_usbpd_disconnect_cb;
772 cb->attention = dp_display_usbpd_attention_cb;
773
774 dp->usbpd = dp_hpd_get(dev, cb);
775 if (IS_ERR(dp->usbpd)) {
776 rc = PTR_ERR(dp->usbpd);
777 DRM_ERROR("failed to initialize hpd, rc = %d\n", rc);
778 dp->usbpd = NULL;
779 goto error;
780 }
781
782 dp->parser = dp_parser_get(dp->pdev);
783 if (IS_ERR(dp->parser)) {
784 rc = PTR_ERR(dp->parser);
785 DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
786 dp->parser = NULL;
787 goto error;
788 }
789
790 dp->catalog = dp_catalog_get(dev, &dp->parser->io);
791 if (IS_ERR(dp->catalog)) {
792 rc = PTR_ERR(dp->catalog);
793 DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
794 dp->catalog = NULL;
795 goto error;
796 }
797
798 dp->power = dp_power_get(dev, dp->parser);
799 if (IS_ERR(dp->power)) {
800 rc = PTR_ERR(dp->power);
801 DRM_ERROR("failed to initialize power, rc = %d\n", rc);
802 dp->power = NULL;
803 goto error;
804 }
805
806 dp->aux = dp_aux_get(dev, dp->catalog, dp->dp_display.is_edp);
807 if (IS_ERR(dp->aux)) {
808 rc = PTR_ERR(dp->aux);
809 DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
810 dp->aux = NULL;
811 goto error;
812 }
813
814 dp->link = dp_link_get(dev, dp->aux);
815 if (IS_ERR(dp->link)) {
816 rc = PTR_ERR(dp->link);
817 DRM_ERROR("failed to initialize link, rc = %d\n", rc);
818 dp->link = NULL;
819 goto error_link;
820 }
821
822 panel_in.aux = dp->aux;
823 panel_in.catalog = dp->catalog;
824 panel_in.link = dp->link;
825
826 dp->panel = dp_panel_get(&panel_in);
827 if (IS_ERR(dp->panel)) {
828 rc = PTR_ERR(dp->panel);
829 DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
830 dp->panel = NULL;
831 goto error_link;
832 }
833
834 dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
835 dp->power, dp->catalog, dp->parser);
836 if (IS_ERR(dp->ctrl)) {
837 rc = PTR_ERR(dp->ctrl);
838 DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
839 dp->ctrl = NULL;
840 goto error_ctrl;
841 }
842
843 dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
844 if (IS_ERR(dp->audio)) {
845 rc = PTR_ERR(dp->audio);
846 pr_err("failed to initialize audio, rc = %d\n", rc);
847 dp->audio = NULL;
848 goto error_ctrl;
849 }
850
851 /* populate wide_bus_en to differernt layers */
852 dp->ctrl->wide_bus_en = dp->wide_bus_en;
853 dp->catalog->wide_bus_en = dp->wide_bus_en;
854
855 return rc;
856
857 error_ctrl:
858 dp_panel_put(dp->panel);
859 error_link:
860 dp_aux_put(dp->aux);
861 error:
862 return rc;
863 }
864
dp_display_set_mode(struct msm_dp * dp_display,struct dp_display_mode * mode)865 static int dp_display_set_mode(struct msm_dp *dp_display,
866 struct dp_display_mode *mode)
867 {
868 struct dp_display_private *dp;
869
870 dp = container_of(dp_display, struct dp_display_private, dp_display);
871
872 drm_mode_copy(&dp->panel->dp_mode.drm_mode, &mode->drm_mode);
873 dp->panel->dp_mode.bpp = mode->bpp;
874 dp->panel->dp_mode.capabilities = mode->capabilities;
875 dp_panel_init_panel_info(dp->panel);
876 return 0;
877 }
878
dp_display_enable(struct dp_display_private * dp,bool force_link_train)879 static int dp_display_enable(struct dp_display_private *dp, bool force_link_train)
880 {
881 int rc = 0;
882 struct msm_dp *dp_display = &dp->dp_display;
883
884 drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
885 if (dp_display->power_on) {
886 drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
887 return 0;
888 }
889
890 rc = dp_ctrl_on_stream(dp->ctrl, force_link_train);
891 if (!rc)
892 dp_display->power_on = true;
893
894 return rc;
895 }
896
dp_display_post_enable(struct msm_dp * dp_display)897 static int dp_display_post_enable(struct msm_dp *dp_display)
898 {
899 struct dp_display_private *dp;
900 u32 rate;
901
902 dp = container_of(dp_display, struct dp_display_private, dp_display);
903
904 rate = dp->link->link_params.rate;
905
906 if (dp->audio_supported) {
907 dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
908 dp->audio->lane_count = dp->link->link_params.num_lanes;
909 }
910
911 /* signal the connect event late to synchronize video and display */
912 dp_display_handle_plugged_change(dp_display, true);
913 return 0;
914 }
915
dp_display_disable(struct dp_display_private * dp)916 static int dp_display_disable(struct dp_display_private *dp)
917 {
918 struct msm_dp *dp_display = &dp->dp_display;
919
920 if (!dp_display->power_on)
921 return 0;
922
923 /* wait only if audio was enabled */
924 if (dp_display->audio_enabled) {
925 /* signal the disconnect event */
926 dp_display_handle_plugged_change(dp_display, false);
927 if (!wait_for_completion_timeout(&dp->audio_comp,
928 HZ * 5))
929 DRM_ERROR("audio comp timeout\n");
930 }
931
932 dp_display->audio_enabled = false;
933
934 if (dp->link->sink_count == 0) {
935 /*
936 * irq_hpd with sink_count = 0
937 * hdmi unplugged out of dongle
938 */
939 dp_ctrl_off_link_stream(dp->ctrl);
940 } else {
941 /*
942 * unplugged interrupt
943 * dongle unplugged out of DUT
944 */
945 dp_ctrl_off(dp->ctrl);
946 dp_display_host_phy_exit(dp);
947 }
948
949 dp_display->power_on = false;
950
951 drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
952 return 0;
953 }
954
dp_display_set_plugged_cb(struct msm_dp * dp_display,hdmi_codec_plugged_cb fn,struct device * codec_dev)955 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
956 hdmi_codec_plugged_cb fn, struct device *codec_dev)
957 {
958 bool plugged;
959
960 dp_display->plugged_cb = fn;
961 dp_display->codec_dev = codec_dev;
962 plugged = dp_display->is_connected;
963 dp_display_handle_plugged_change(dp_display, plugged);
964
965 return 0;
966 }
967
968 /**
969 * dp_bridge_mode_valid - callback to determine if specified mode is valid
970 * @bridge: Pointer to drm bridge structure
971 * @info: display info
972 * @mode: Pointer to drm mode structure
973 * Returns: Validity status for specified mode
974 */
dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)975 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
976 const struct drm_display_info *info,
977 const struct drm_display_mode *mode)
978 {
979 const u32 num_components = 3, default_bpp = 24;
980 struct dp_display_private *dp_display;
981 struct dp_link_info *link_info;
982 u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
983 struct msm_dp *dp;
984 int mode_pclk_khz = mode->clock;
985
986 dp = to_dp_bridge(bridge)->dp_display;
987
988 if (!dp || !mode_pclk_khz || !dp->connector) {
989 DRM_ERROR("invalid params\n");
990 return -EINVAL;
991 }
992
993 /*
994 * The eDP controller currently does not have a reliable way of
995 * enabling panel power to read sink capabilities. So, we rely
996 * on the panel driver to populate only supported modes for now.
997 */
998 if (dp->is_edp)
999 return MODE_OK;
1000
1001 if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
1002 return MODE_CLOCK_HIGH;
1003
1004 dp_display = container_of(dp, struct dp_display_private, dp_display);
1005 link_info = &dp_display->panel->link_info;
1006
1007 mode_bpp = dp->connector->display_info.bpc * num_components;
1008 if (!mode_bpp)
1009 mode_bpp = default_bpp;
1010
1011 mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
1012 mode_bpp, mode_pclk_khz);
1013
1014 mode_rate_khz = mode_pclk_khz * mode_bpp;
1015 supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
1016
1017 if (mode_rate_khz > supported_rate_khz)
1018 return MODE_BAD;
1019
1020 return MODE_OK;
1021 }
1022
dp_display_get_modes(struct msm_dp * dp)1023 int dp_display_get_modes(struct msm_dp *dp)
1024 {
1025 struct dp_display_private *dp_display;
1026
1027 if (!dp) {
1028 DRM_ERROR("invalid params\n");
1029 return 0;
1030 }
1031
1032 dp_display = container_of(dp, struct dp_display_private, dp_display);
1033
1034 return dp_panel_get_modes(dp_display->panel,
1035 dp->connector);
1036 }
1037
dp_display_check_video_test(struct msm_dp * dp)1038 bool dp_display_check_video_test(struct msm_dp *dp)
1039 {
1040 struct dp_display_private *dp_display;
1041
1042 dp_display = container_of(dp, struct dp_display_private, dp_display);
1043
1044 return dp_display->panel->video_test;
1045 }
1046
dp_display_get_test_bpp(struct msm_dp * dp)1047 int dp_display_get_test_bpp(struct msm_dp *dp)
1048 {
1049 struct dp_display_private *dp_display;
1050
1051 if (!dp) {
1052 DRM_ERROR("invalid params\n");
1053 return 0;
1054 }
1055
1056 dp_display = container_of(dp, struct dp_display_private, dp_display);
1057
1058 return dp_link_bit_depth_to_bpp(
1059 dp_display->link->test_video.test_bit_depth);
1060 }
1061
msm_dp_snapshot(struct msm_disp_state * disp_state,struct msm_dp * dp)1062 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1063 {
1064 struct dp_display_private *dp_display;
1065
1066 dp_display = container_of(dp, struct dp_display_private, dp_display);
1067
1068 /*
1069 * if we are reading registers we need the link clocks to be on
1070 * however till DP cable is connected this will not happen as we
1071 * do not know the resolution to power up with. Hence check the
1072 * power_on status before dumping DP registers to avoid crash due
1073 * to unclocked access
1074 */
1075 mutex_lock(&dp_display->event_mutex);
1076
1077 if (!dp->power_on) {
1078 mutex_unlock(&dp_display->event_mutex);
1079 return;
1080 }
1081
1082 dp_catalog_snapshot(dp_display->catalog, disp_state);
1083
1084 mutex_unlock(&dp_display->event_mutex);
1085 }
1086
dp_display_config_hpd(struct dp_display_private * dp)1087 static void dp_display_config_hpd(struct dp_display_private *dp)
1088 {
1089
1090 dp_display_host_init(dp);
1091 dp_catalog_ctrl_hpd_config(dp->catalog);
1092
1093 /* Enable plug and unplug interrupts only if requested */
1094 if (dp->dp_display.internal_hpd)
1095 dp_catalog_hpd_config_intr(dp->catalog,
1096 DP_DP_HPD_PLUG_INT_MASK |
1097 DP_DP_HPD_UNPLUG_INT_MASK,
1098 true);
1099
1100 /* Enable interrupt first time
1101 * we are leaving dp clocks on during disconnect
1102 * and never disable interrupt
1103 */
1104 enable_irq(dp->irq);
1105 }
1106
hpd_event_thread(void * data)1107 static int hpd_event_thread(void *data)
1108 {
1109 struct dp_display_private *dp_priv;
1110 unsigned long flag;
1111 struct dp_event *todo;
1112 int timeout_mode = 0;
1113
1114 dp_priv = (struct dp_display_private *)data;
1115
1116 while (1) {
1117 if (timeout_mode) {
1118 wait_event_timeout(dp_priv->event_q,
1119 (dp_priv->event_pndx == dp_priv->event_gndx) ||
1120 kthread_should_stop(), EVENT_TIMEOUT);
1121 } else {
1122 wait_event_interruptible(dp_priv->event_q,
1123 (dp_priv->event_pndx != dp_priv->event_gndx) ||
1124 kthread_should_stop());
1125 }
1126
1127 if (kthread_should_stop())
1128 break;
1129
1130 spin_lock_irqsave(&dp_priv->event_lock, flag);
1131 todo = &dp_priv->event_list[dp_priv->event_gndx];
1132 if (todo->delay) {
1133 struct dp_event *todo_next;
1134
1135 dp_priv->event_gndx++;
1136 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1137
1138 /* re enter delay event into q */
1139 todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
1140 dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1141 todo_next->event_id = todo->event_id;
1142 todo_next->data = todo->data;
1143 todo_next->delay = todo->delay - 1;
1144
1145 /* clean up older event */
1146 todo->event_id = EV_NO_EVENT;
1147 todo->delay = 0;
1148
1149 /* switch to timeout mode */
1150 timeout_mode = 1;
1151 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1152 continue;
1153 }
1154
1155 /* timeout with no events in q */
1156 if (dp_priv->event_pndx == dp_priv->event_gndx) {
1157 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1158 continue;
1159 }
1160
1161 dp_priv->event_gndx++;
1162 dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1163 timeout_mode = 0;
1164 spin_unlock_irqrestore(&dp_priv->event_lock, flag);
1165
1166 switch (todo->event_id) {
1167 case EV_HPD_INIT_SETUP:
1168 dp_display_config_hpd(dp_priv);
1169 break;
1170 case EV_HPD_PLUG_INT:
1171 dp_hpd_plug_handle(dp_priv, todo->data);
1172 break;
1173 case EV_HPD_UNPLUG_INT:
1174 dp_hpd_unplug_handle(dp_priv, todo->data);
1175 break;
1176 case EV_IRQ_HPD_INT:
1177 dp_irq_hpd_handle(dp_priv, todo->data);
1178 break;
1179 case EV_USER_NOTIFICATION:
1180 dp_display_send_hpd_notification(dp_priv,
1181 todo->data);
1182 break;
1183 default:
1184 break;
1185 }
1186 }
1187
1188 return 0;
1189 }
1190
dp_hpd_event_thread_start(struct dp_display_private * dp_priv)1191 static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
1192 {
1193 /* set event q to empty */
1194 dp_priv->event_gndx = 0;
1195 dp_priv->event_pndx = 0;
1196
1197 dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
1198 if (IS_ERR(dp_priv->ev_tsk))
1199 return PTR_ERR(dp_priv->ev_tsk);
1200
1201 return 0;
1202 }
1203
dp_display_irq_handler(int irq,void * dev_id)1204 static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
1205 {
1206 struct dp_display_private *dp = dev_id;
1207 irqreturn_t ret = IRQ_HANDLED;
1208 u32 hpd_isr_status;
1209
1210 if (!dp) {
1211 DRM_ERROR("invalid data\n");
1212 return IRQ_NONE;
1213 }
1214
1215 hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
1216
1217 if (hpd_isr_status & 0x0F) {
1218 drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1219 dp->dp_display.connector_type, hpd_isr_status);
1220 /* hpd related interrupts */
1221 if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1222 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1223
1224 if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1225 dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1226 }
1227
1228 if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1229 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1230 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1231 }
1232
1233 if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1234 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1235 }
1236
1237 /* DP controller isr */
1238 dp_ctrl_isr(dp->ctrl);
1239
1240 /* DP aux isr */
1241 dp_aux_isr(dp->aux);
1242
1243 return ret;
1244 }
1245
dp_display_request_irq(struct msm_dp * dp_display)1246 int dp_display_request_irq(struct msm_dp *dp_display)
1247 {
1248 int rc = 0;
1249 struct dp_display_private *dp;
1250
1251 if (!dp_display) {
1252 DRM_ERROR("invalid input\n");
1253 return -EINVAL;
1254 }
1255
1256 dp = container_of(dp_display, struct dp_display_private, dp_display);
1257
1258 dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
1259 if (!dp->irq) {
1260 DRM_ERROR("failed to get irq\n");
1261 return -EINVAL;
1262 }
1263
1264 rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
1265 dp_display_irq_handler,
1266 IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
1267 if (rc < 0) {
1268 DRM_ERROR("failed to request IRQ%u: %d\n",
1269 dp->irq, rc);
1270 return rc;
1271 }
1272 disable_irq(dp->irq);
1273
1274 return 0;
1275 }
1276
dp_display_get_desc(struct platform_device * pdev)1277 static const struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)
1278 {
1279 const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1280 struct resource *res;
1281 int i;
1282
1283 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1284 if (!res)
1285 return NULL;
1286
1287 for (i = 0; i < descs[i].io_start; i++) {
1288 if (descs[i].io_start == res->start)
1289 return &descs[i];
1290 }
1291
1292 dev_err(&pdev->dev, "unknown displayport instance\n");
1293 return NULL;
1294 }
1295
dp_display_probe(struct platform_device * pdev)1296 static int dp_display_probe(struct platform_device *pdev)
1297 {
1298 int rc = 0;
1299 struct dp_display_private *dp;
1300 const struct msm_dp_desc *desc;
1301
1302 if (!pdev || !pdev->dev.of_node) {
1303 DRM_ERROR("pdev not found\n");
1304 return -ENODEV;
1305 }
1306
1307 dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1308 if (!dp)
1309 return -ENOMEM;
1310
1311 desc = dp_display_get_desc(pdev);
1312 if (!desc)
1313 return -EINVAL;
1314
1315 dp->pdev = pdev;
1316 dp->name = "drm_dp";
1317 dp->id = desc->id;
1318 dp->dp_display.connector_type = desc->connector_type;
1319 dp->wide_bus_en = desc->wide_bus_en;
1320 dp->dp_display.is_edp =
1321 (dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1322
1323 rc = dp_init_sub_modules(dp);
1324 if (rc) {
1325 DRM_ERROR("init sub module failed\n");
1326 return -EPROBE_DEFER;
1327 }
1328
1329 /* setup event q */
1330 mutex_init(&dp->event_mutex);
1331 init_waitqueue_head(&dp->event_q);
1332 spin_lock_init(&dp->event_lock);
1333
1334 /* Store DP audio handle inside DP display */
1335 dp->dp_display.dp_audio = dp->audio;
1336
1337 init_completion(&dp->audio_comp);
1338
1339 platform_set_drvdata(pdev, &dp->dp_display);
1340
1341 rc = component_add(&pdev->dev, &dp_display_comp_ops);
1342 if (rc) {
1343 DRM_ERROR("component add failed, rc=%d\n", rc);
1344 dp_display_deinit_sub_modules(dp);
1345 }
1346
1347 return rc;
1348 }
1349
dp_display_remove(struct platform_device * pdev)1350 static int dp_display_remove(struct platform_device *pdev)
1351 {
1352 struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1353
1354 dp_display_deinit_sub_modules(dp);
1355
1356 component_del(&pdev->dev, &dp_display_comp_ops);
1357 platform_set_drvdata(pdev, NULL);
1358
1359 return 0;
1360 }
1361
dp_pm_resume(struct device * dev)1362 static int dp_pm_resume(struct device *dev)
1363 {
1364 struct platform_device *pdev = to_platform_device(dev);
1365 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1366 struct dp_display_private *dp;
1367 int sink_count = 0;
1368
1369 dp = container_of(dp_display, struct dp_display_private, dp_display);
1370
1371 mutex_lock(&dp->event_mutex);
1372
1373 drm_dbg_dp(dp->drm_dev,
1374 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1375 dp->dp_display.connector_type, dp->core_initialized,
1376 dp->phy_initialized, dp_display->power_on);
1377
1378 /* start from disconnected state */
1379 dp->hpd_state = ST_DISCONNECTED;
1380
1381 /* turn on dp ctrl/phy */
1382 dp_display_host_init(dp);
1383
1384 dp_catalog_ctrl_hpd_config(dp->catalog);
1385
1386 if (dp->dp_display.internal_hpd)
1387 dp_catalog_hpd_config_intr(dp->catalog,
1388 DP_DP_HPD_PLUG_INT_MASK |
1389 DP_DP_HPD_UNPLUG_INT_MASK,
1390 true);
1391
1392 if (dp_catalog_link_is_connected(dp->catalog)) {
1393 /*
1394 * set sink to normal operation mode -- D0
1395 * before dpcd read
1396 */
1397 dp_display_host_phy_init(dp);
1398 dp_link_psm_config(dp->link, &dp->panel->link_info, false);
1399 sink_count = drm_dp_read_sink_count(dp->aux);
1400 if (sink_count < 0)
1401 sink_count = 0;
1402
1403 dp_display_host_phy_exit(dp);
1404 }
1405
1406 dp->link->sink_count = sink_count;
1407 /*
1408 * can not declared display is connected unless
1409 * HDMI cable is plugged in and sink_count of
1410 * dongle become 1
1411 * also only signal audio when disconnected
1412 */
1413 if (dp->link->sink_count) {
1414 dp->dp_display.is_connected = true;
1415 } else {
1416 dp->dp_display.is_connected = false;
1417 dp_display_handle_plugged_change(dp_display, false);
1418 }
1419
1420 drm_dbg_dp(dp->drm_dev,
1421 "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
1422 dp->dp_display.connector_type, dp->link->sink_count,
1423 dp->dp_display.is_connected, dp->core_initialized,
1424 dp->phy_initialized, dp_display->power_on);
1425
1426 mutex_unlock(&dp->event_mutex);
1427
1428 return 0;
1429 }
1430
dp_pm_suspend(struct device * dev)1431 static int dp_pm_suspend(struct device *dev)
1432 {
1433 struct platform_device *pdev = to_platform_device(dev);
1434 struct msm_dp *dp_display = platform_get_drvdata(pdev);
1435 struct dp_display_private *dp;
1436
1437 dp = container_of(dp_display, struct dp_display_private, dp_display);
1438
1439 mutex_lock(&dp->event_mutex);
1440
1441 drm_dbg_dp(dp->drm_dev,
1442 "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1443 dp->dp_display.connector_type, dp->core_initialized,
1444 dp->phy_initialized, dp_display->power_on);
1445
1446 /* mainlink enabled */
1447 if (dp_power_clk_status(dp->power, DP_CTRL_PM))
1448 dp_ctrl_off_link_stream(dp->ctrl);
1449
1450 dp_display_host_phy_exit(dp);
1451
1452 /* host_init will be called at pm_resume */
1453 dp_display_host_deinit(dp);
1454
1455 dp->hpd_state = ST_SUSPENDED;
1456
1457 drm_dbg_dp(dp->drm_dev,
1458 "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
1459 dp->dp_display.connector_type, dp->core_initialized,
1460 dp->phy_initialized, dp_display->power_on);
1461
1462 mutex_unlock(&dp->event_mutex);
1463
1464 return 0;
1465 }
1466
1467 static const struct dev_pm_ops dp_pm_ops = {
1468 .suspend = dp_pm_suspend,
1469 .resume = dp_pm_resume,
1470 };
1471
1472 static struct platform_driver dp_display_driver = {
1473 .probe = dp_display_probe,
1474 .remove = dp_display_remove,
1475 .driver = {
1476 .name = "msm-dp-display",
1477 .of_match_table = dp_dt_match,
1478 .suppress_bind_attrs = true,
1479 .pm = &dp_pm_ops,
1480 },
1481 };
1482
msm_dp_register(void)1483 int __init msm_dp_register(void)
1484 {
1485 int ret;
1486
1487 ret = platform_driver_register(&dp_display_driver);
1488 if (ret)
1489 DRM_ERROR("Dp display driver register failed");
1490
1491 return ret;
1492 }
1493
msm_dp_unregister(void)1494 void __exit msm_dp_unregister(void)
1495 {
1496 platform_driver_unregister(&dp_display_driver);
1497 }
1498
msm_dp_irq_postinstall(struct msm_dp * dp_display)1499 void msm_dp_irq_postinstall(struct msm_dp *dp_display)
1500 {
1501 struct dp_display_private *dp;
1502
1503 if (!dp_display)
1504 return;
1505
1506 dp = container_of(dp_display, struct dp_display_private, dp_display);
1507
1508 if (!dp_display->is_edp)
1509 dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 0);
1510 }
1511
msm_dp_wide_bus_available(const struct msm_dp * dp_display)1512 bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
1513 {
1514 struct dp_display_private *dp;
1515
1516 dp = container_of(dp_display, struct dp_display_private, dp_display);
1517
1518 return dp->wide_bus_en;
1519 }
1520
msm_dp_debugfs_init(struct msm_dp * dp_display,struct drm_minor * minor)1521 void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
1522 {
1523 struct dp_display_private *dp;
1524 struct device *dev;
1525 int rc;
1526
1527 dp = container_of(dp_display, struct dp_display_private, dp_display);
1528 dev = &dp->pdev->dev;
1529
1530 dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
1531 dp->link, dp->dp_display.connector,
1532 minor);
1533 if (IS_ERR(dp->debug)) {
1534 rc = PTR_ERR(dp->debug);
1535 DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1536 dp->debug = NULL;
1537 }
1538 }
1539
of_dp_aux_depopulate_bus_void(void * data)1540 static void of_dp_aux_depopulate_bus_void(void *data)
1541 {
1542 of_dp_aux_depopulate_bus(data);
1543 }
1544
dp_display_get_next_bridge(struct msm_dp * dp)1545 static int dp_display_get_next_bridge(struct msm_dp *dp)
1546 {
1547 int rc;
1548 struct dp_display_private *dp_priv;
1549 struct device_node *aux_bus;
1550 struct device *dev;
1551
1552 dp_priv = container_of(dp, struct dp_display_private, dp_display);
1553 dev = &dp_priv->pdev->dev;
1554 aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
1555
1556 if (aux_bus && dp->is_edp) {
1557 dp_display_host_init(dp_priv);
1558 dp_catalog_ctrl_hpd_config(dp_priv->catalog);
1559 dp_display_host_phy_init(dp_priv);
1560 enable_irq(dp_priv->irq);
1561
1562 /*
1563 * The code below assumes that the panel will finish probing
1564 * by the time devm_of_dp_aux_populate_ep_devices() returns.
1565 * This isn't a great assumption since it will fail if the
1566 * panel driver is probed asynchronously but is the best we
1567 * can do without a bigger driver reorganization.
1568 */
1569 rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
1570 of_node_put(aux_bus);
1571 if (rc)
1572 goto error;
1573
1574 rc = devm_add_action_or_reset(dp->drm_dev->dev,
1575 of_dp_aux_depopulate_bus_void,
1576 dp_priv->aux);
1577 if (rc)
1578 goto error;
1579 } else if (dp->is_edp) {
1580 DRM_ERROR("eDP aux_bus not found\n");
1581 return -ENODEV;
1582 }
1583
1584 /*
1585 * External bridges are mandatory for eDP interfaces: one has to
1586 * provide at least an eDP panel (which gets wrapped into panel-bridge).
1587 *
1588 * For DisplayPort interfaces external bridges are optional, so
1589 * silently ignore an error if one is not present (-ENODEV).
1590 */
1591 rc = devm_dp_parser_find_next_bridge(dp->drm_dev->dev, dp_priv->parser);
1592 if (!dp->is_edp && rc == -ENODEV)
1593 return 0;
1594
1595 if (!rc) {
1596 dp->next_bridge = dp_priv->parser->next_bridge;
1597 return 0;
1598 }
1599
1600 error:
1601 if (dp->is_edp) {
1602 disable_irq(dp_priv->irq);
1603 dp_display_host_phy_exit(dp_priv);
1604 dp_display_host_deinit(dp_priv);
1605 }
1606 return rc;
1607 }
1608
msm_dp_modeset_init(struct msm_dp * dp_display,struct drm_device * dev,struct drm_encoder * encoder)1609 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
1610 struct drm_encoder *encoder)
1611 {
1612 struct msm_drm_private *priv = dev->dev_private;
1613 struct dp_display_private *dp_priv;
1614 int ret;
1615
1616 dp_display->drm_dev = dev;
1617
1618 dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
1619
1620 ret = dp_display_request_irq(dp_display);
1621 if (ret) {
1622 DRM_ERROR("request_irq failed, ret=%d\n", ret);
1623 return ret;
1624 }
1625
1626 ret = dp_display_get_next_bridge(dp_display);
1627 if (ret)
1628 return ret;
1629
1630 dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
1631 if (IS_ERR(dp_display->bridge)) {
1632 ret = PTR_ERR(dp_display->bridge);
1633 DRM_DEV_ERROR(dev->dev,
1634 "failed to create dp bridge: %d\n", ret);
1635 dp_display->bridge = NULL;
1636 return ret;
1637 }
1638
1639 priv->bridges[priv->num_bridges++] = dp_display->bridge;
1640
1641 dp_display->connector = dp_drm_connector_init(dp_display, encoder);
1642 if (IS_ERR(dp_display->connector)) {
1643 ret = PTR_ERR(dp_display->connector);
1644 DRM_DEV_ERROR(dev->dev,
1645 "failed to create dp connector: %d\n", ret);
1646 dp_display->connector = NULL;
1647 return ret;
1648 }
1649
1650 dp_priv->panel->connector = dp_display->connector;
1651
1652 return 0;
1653 }
1654
dp_bridge_enable(struct drm_bridge * drm_bridge)1655 void dp_bridge_enable(struct drm_bridge *drm_bridge)
1656 {
1657 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1658 struct msm_dp *dp = dp_bridge->dp_display;
1659 int rc = 0;
1660 struct dp_display_private *dp_display;
1661 u32 state;
1662 bool force_link_train = false;
1663
1664 dp_display = container_of(dp, struct dp_display_private, dp_display);
1665 if (!dp_display->dp_mode.drm_mode.clock) {
1666 DRM_ERROR("invalid params\n");
1667 return;
1668 }
1669
1670 if (dp->is_edp)
1671 dp_hpd_plug_handle(dp_display, 0);
1672
1673 mutex_lock(&dp_display->event_mutex);
1674
1675 state = dp_display->hpd_state;
1676 if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1677 mutex_unlock(&dp_display->event_mutex);
1678 return;
1679 }
1680
1681 rc = dp_display_set_mode(dp, &dp_display->dp_mode);
1682 if (rc) {
1683 DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1684 mutex_unlock(&dp_display->event_mutex);
1685 return;
1686 }
1687
1688 state = dp_display->hpd_state;
1689
1690 if (state == ST_DISPLAY_OFF) {
1691 dp_display_host_phy_init(dp_display);
1692 force_link_train = true;
1693 }
1694
1695 dp_display_enable(dp_display, force_link_train);
1696
1697 rc = dp_display_post_enable(dp);
1698 if (rc) {
1699 DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1700 dp_display_disable(dp_display);
1701 }
1702
1703 /* completed connection */
1704 dp_display->hpd_state = ST_CONNECTED;
1705
1706 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1707 mutex_unlock(&dp_display->event_mutex);
1708 }
1709
dp_bridge_disable(struct drm_bridge * drm_bridge)1710 void dp_bridge_disable(struct drm_bridge *drm_bridge)
1711 {
1712 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1713 struct msm_dp *dp = dp_bridge->dp_display;
1714 struct dp_display_private *dp_display;
1715
1716 dp_display = container_of(dp, struct dp_display_private, dp_display);
1717
1718 dp_ctrl_push_idle(dp_display->ctrl);
1719 }
1720
dp_bridge_post_disable(struct drm_bridge * drm_bridge)1721 void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
1722 {
1723 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1724 struct msm_dp *dp = dp_bridge->dp_display;
1725 u32 state;
1726 struct dp_display_private *dp_display;
1727
1728 dp_display = container_of(dp, struct dp_display_private, dp_display);
1729
1730 if (dp->is_edp)
1731 dp_hpd_unplug_handle(dp_display, 0);
1732
1733 mutex_lock(&dp_display->event_mutex);
1734
1735 state = dp_display->hpd_state;
1736 if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
1737 mutex_unlock(&dp_display->event_mutex);
1738 return;
1739 }
1740
1741 dp_display_disable(dp_display);
1742
1743 state = dp_display->hpd_state;
1744 if (state == ST_DISCONNECT_PENDING) {
1745 /* completed disconnection */
1746 dp_display->hpd_state = ST_DISCONNECTED;
1747 } else {
1748 dp_display->hpd_state = ST_DISPLAY_OFF;
1749 }
1750
1751 drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1752 mutex_unlock(&dp_display->event_mutex);
1753 }
1754
dp_bridge_mode_set(struct drm_bridge * drm_bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)1755 void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1756 const struct drm_display_mode *mode,
1757 const struct drm_display_mode *adjusted_mode)
1758 {
1759 struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
1760 struct msm_dp *dp = dp_bridge->dp_display;
1761 struct dp_display_private *dp_display;
1762
1763 dp_display = container_of(dp, struct dp_display_private, dp_display);
1764
1765 memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
1766
1767 if (dp_display_check_video_test(dp))
1768 dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
1769 else /* Default num_components per pixel = 3 */
1770 dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
1771
1772 if (!dp_display->dp_mode.bpp)
1773 dp_display->dp_mode.bpp = 24; /* Default bpp */
1774
1775 drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
1776
1777 dp_display->dp_mode.v_active_low =
1778 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1779
1780 dp_display->dp_mode.h_active_low =
1781 !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1782 }
1783
dp_bridge_hpd_enable(struct drm_bridge * bridge)1784 void dp_bridge_hpd_enable(struct drm_bridge *bridge)
1785 {
1786 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1787 struct msm_dp *dp_display = dp_bridge->dp_display;
1788
1789 dp_display->internal_hpd = true;
1790 }
1791
dp_bridge_hpd_disable(struct drm_bridge * bridge)1792 void dp_bridge_hpd_disable(struct drm_bridge *bridge)
1793 {
1794 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1795 struct msm_dp *dp_display = dp_bridge->dp_display;
1796
1797 dp_display->internal_hpd = false;
1798 }
1799
dp_bridge_hpd_notify(struct drm_bridge * bridge,enum drm_connector_status status)1800 void dp_bridge_hpd_notify(struct drm_bridge *bridge,
1801 enum drm_connector_status status)
1802 {
1803 struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
1804 struct msm_dp *dp_display = dp_bridge->dp_display;
1805 struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
1806
1807 /* Without next_bridge interrupts are handled by the DP core directly */
1808 if (dp_display->internal_hpd)
1809 return;
1810
1811 if (!dp->core_initialized) {
1812 drm_dbg_dp(dp->drm_dev, "not initialized\n");
1813 return;
1814 }
1815
1816 if (!dp_display->is_connected && status == connector_status_connected)
1817 dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1818 else if (dp_display->is_connected && status == connector_status_disconnected)
1819 dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1820 }
1821