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