xref: /linux/drivers/gpu/drm/msm/dp/dp_display.c (revision 3ef7acec975bde28ab9cef92af76be8fc2ce684d)
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/phy/phy.h>
13 #include <linux/delay.h>
14 #include <drm/display/drm_dp_aux_bus.h>
15 #include <drm/drm_edid.h>
16 
17 #include "msm_drv.h"
18 #include "msm_kms.h"
19 #include "dp_ctrl.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_display.h"
26 #include "dp_drm.h"
27 #include "dp_audio.h"
28 #include "dp_debug.h"
29 
30 static bool psr_enabled = false;
31 module_param(psr_enabled, bool, 0);
32 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
33 
34 #define HPD_STRING_SIZE 30
35 
36 enum {
37 	ISR_DISCONNECTED,
38 	ISR_CONNECT_PENDING,
39 	ISR_CONNECTED,
40 	ISR_HPD_REPLUG_COUNT,
41 	ISR_IRQ_HPD_PULSE_COUNT,
42 	ISR_HPD_LO_GLITH_COUNT,
43 };
44 
45 /* event thread connection state */
46 enum {
47 	ST_DISCONNECTED,
48 	ST_MAINLINK_READY,
49 	ST_CONNECTED,
50 	ST_DISCONNECT_PENDING,
51 	ST_DISPLAY_OFF,
52 };
53 
54 enum {
55 	EV_NO_EVENT,
56 	/* hpd events */
57 	EV_HPD_PLUG_INT,
58 	EV_IRQ_HPD_INT,
59 	EV_HPD_UNPLUG_INT,
60 	EV_USER_NOTIFICATION,
61 };
62 
63 #define EVENT_TIMEOUT	(HZ/10)	/* 100ms */
64 #define DP_EVENT_Q_MAX	8
65 
66 #define DP_TIMEOUT_NONE		0
67 
68 #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
69 
70 struct msm_dp_event {
71 	u32 event_id;
72 	u32 data;
73 	u32 delay;
74 };
75 
76 struct msm_dp_display_private {
77 	int irq;
78 
79 	unsigned int id;
80 
81 	/* state variables */
82 	bool core_initialized;
83 	bool phy_initialized;
84 	bool audio_supported;
85 
86 	struct drm_device *drm_dev;
87 
88 	struct msm_dp_catalog *catalog;
89 	struct drm_dp_aux *aux;
90 	struct msm_dp_link    *link;
91 	struct msm_dp_panel   *panel;
92 	struct msm_dp_ctrl    *ctrl;
93 
94 	struct msm_dp_display_mode msm_dp_mode;
95 	struct msm_dp msm_dp_display;
96 
97 	/* wait for audio signaling */
98 	struct completion audio_comp;
99 
100 	/* event related only access by event thread */
101 	struct mutex event_mutex;
102 	wait_queue_head_t event_q;
103 	u32 hpd_state;
104 	u32 event_pndx;
105 	u32 event_gndx;
106 	struct task_struct *ev_tsk;
107 	struct msm_dp_event event_list[DP_EVENT_Q_MAX];
108 	spinlock_t event_lock;
109 
110 	bool wide_bus_supported;
111 
112 	struct msm_dp_audio *audio;
113 };
114 
115 struct msm_dp_desc {
116 	phys_addr_t io_start;
117 	unsigned int id;
118 	bool wide_bus_supported;
119 };
120 
121 static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
122 	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
123 	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
124 	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
125 	{ .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
126 	{}
127 };
128 
129 static const struct msm_dp_desc msm_dp_desc_sc7180[] = {
130 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
131 	{}
132 };
133 
134 static const struct msm_dp_desc msm_dp_desc_sc7280[] = {
135 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
136 	{ .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
137 	{}
138 };
139 
140 static const struct msm_dp_desc msm_dp_desc_sc8180x[] = {
141 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
142 	{ .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
143 	{ .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
144 	{}
145 };
146 
147 static const struct msm_dp_desc msm_dp_desc_sc8280xp[] = {
148 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
149 	{ .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
150 	{ .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
151 	{ .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
152 	{ .io_start = 0x22090000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
153 	{ .io_start = 0x22098000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
154 	{ .io_start = 0x2209a000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
155 	{ .io_start = 0x220a0000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
156 	{}
157 };
158 
159 static const struct msm_dp_desc msm_dp_desc_sm8650[] = {
160 	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
161 	{}
162 };
163 
164 static const struct msm_dp_desc msm_dp_desc_x1e80100[] = {
165 	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
166 	{ .io_start = 0x0ae98000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
167 	{ .io_start = 0x0ae9a000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
168 	{ .io_start = 0x0aea0000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
169 	{}
170 };
171 
172 static const struct of_device_id msm_dp_dt_match[] = {
173 	{ .compatible = "qcom,sa8775p-dp", .data = &msm_dp_desc_sa8775p },
174 	{ .compatible = "qcom,sc7180-dp", .data = &msm_dp_desc_sc7180 },
175 	{ .compatible = "qcom,sc7280-dp", .data = &msm_dp_desc_sc7280 },
176 	{ .compatible = "qcom,sc7280-edp", .data = &msm_dp_desc_sc7280 },
177 	{ .compatible = "qcom,sc8180x-dp", .data = &msm_dp_desc_sc8180x },
178 	{ .compatible = "qcom,sc8180x-edp", .data = &msm_dp_desc_sc8180x },
179 	{ .compatible = "qcom,sc8280xp-dp", .data = &msm_dp_desc_sc8280xp },
180 	{ .compatible = "qcom,sc8280xp-edp", .data = &msm_dp_desc_sc8280xp },
181 	{ .compatible = "qcom,sdm845-dp", .data = &msm_dp_desc_sc7180 },
182 	{ .compatible = "qcom,sm8350-dp", .data = &msm_dp_desc_sc7180 },
183 	{ .compatible = "qcom,sm8650-dp", .data = &msm_dp_desc_sm8650 },
184 	{ .compatible = "qcom,x1e80100-dp", .data = &msm_dp_desc_x1e80100 },
185 	{}
186 };
187 
dev_get_dp_display_private(struct device * dev)188 static struct msm_dp_display_private *dev_get_dp_display_private(struct device *dev)
189 {
190 	struct msm_dp *dp = dev_get_drvdata(dev);
191 
192 	return container_of(dp, struct msm_dp_display_private, msm_dp_display);
193 }
194 
msm_dp_add_event(struct msm_dp_display_private * msm_dp_priv,u32 event,u32 data,u32 delay)195 static int msm_dp_add_event(struct msm_dp_display_private *msm_dp_priv, u32 event,
196 						u32 data, u32 delay)
197 {
198 	unsigned long flag;
199 	struct msm_dp_event *todo;
200 	int pndx;
201 
202 	spin_lock_irqsave(&msm_dp_priv->event_lock, flag);
203 	pndx = msm_dp_priv->event_pndx + 1;
204 	pndx %= DP_EVENT_Q_MAX;
205 	if (pndx == msm_dp_priv->event_gndx) {
206 		pr_err("event_q is full: pndx=%d gndx=%d\n",
207 			msm_dp_priv->event_pndx, msm_dp_priv->event_gndx);
208 		spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
209 		return -EPERM;
210 	}
211 	todo = &msm_dp_priv->event_list[msm_dp_priv->event_pndx++];
212 	msm_dp_priv->event_pndx %= DP_EVENT_Q_MAX;
213 	todo->event_id = event;
214 	todo->data = data;
215 	todo->delay = delay;
216 	wake_up(&msm_dp_priv->event_q);
217 	spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
218 
219 	return 0;
220 }
221 
msm_dp_del_event(struct msm_dp_display_private * msm_dp_priv,u32 event)222 static int msm_dp_del_event(struct msm_dp_display_private *msm_dp_priv, u32 event)
223 {
224 	unsigned long flag;
225 	struct msm_dp_event *todo;
226 	u32	gndx;
227 
228 	spin_lock_irqsave(&msm_dp_priv->event_lock, flag);
229 	if (msm_dp_priv->event_pndx == msm_dp_priv->event_gndx) {
230 		spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
231 		return -ENOENT;
232 	}
233 
234 	gndx = msm_dp_priv->event_gndx;
235 	while (msm_dp_priv->event_pndx != gndx) {
236 		todo = &msm_dp_priv->event_list[gndx];
237 		if (todo->event_id == event) {
238 			todo->event_id = EV_NO_EVENT;	/* deleted */
239 			todo->delay = 0;
240 		}
241 		gndx++;
242 		gndx %= DP_EVENT_Q_MAX;
243 	}
244 	spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
245 
246 	return 0;
247 }
248 
msm_dp_display_signal_audio_start(struct msm_dp * msm_dp_display)249 void msm_dp_display_signal_audio_start(struct msm_dp *msm_dp_display)
250 {
251 	struct msm_dp_display_private *dp;
252 
253 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
254 
255 	reinit_completion(&dp->audio_comp);
256 }
257 
msm_dp_display_signal_audio_complete(struct msm_dp * msm_dp_display)258 void msm_dp_display_signal_audio_complete(struct msm_dp *msm_dp_display)
259 {
260 	struct msm_dp_display_private *dp;
261 
262 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
263 
264 	complete_all(&dp->audio_comp);
265 }
266 
267 static int msm_dp_hpd_event_thread_start(struct msm_dp_display_private *msm_dp_priv);
268 
msm_dp_display_bind(struct device * dev,struct device * master,void * data)269 static int msm_dp_display_bind(struct device *dev, struct device *master,
270 			   void *data)
271 {
272 	int rc = 0;
273 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
274 	struct msm_drm_private *priv = dev_get_drvdata(master);
275 	struct drm_device *drm = priv->dev;
276 
277 	dp->msm_dp_display.drm_dev = drm;
278 	priv->dp[dp->id] = &dp->msm_dp_display;
279 
280 
281 
282 	dp->drm_dev = drm;
283 	dp->aux->drm_dev = drm;
284 	rc = msm_dp_aux_register(dp->aux);
285 	if (rc) {
286 		DRM_ERROR("DRM DP AUX register failed\n");
287 		goto end;
288 	}
289 
290 
291 	rc = msm_dp_register_audio_driver(dev, dp->audio);
292 	if (rc) {
293 		DRM_ERROR("Audio registration Dp failed\n");
294 		goto end;
295 	}
296 
297 	rc = msm_dp_hpd_event_thread_start(dp);
298 	if (rc) {
299 		DRM_ERROR("Event thread create failed\n");
300 		goto end;
301 	}
302 
303 	return 0;
304 end:
305 	return rc;
306 }
307 
msm_dp_display_unbind(struct device * dev,struct device * master,void * data)308 static void msm_dp_display_unbind(struct device *dev, struct device *master,
309 			      void *data)
310 {
311 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
312 	struct msm_drm_private *priv = dev_get_drvdata(master);
313 
314 	kthread_stop(dp->ev_tsk);
315 
316 	of_dp_aux_depopulate_bus(dp->aux);
317 
318 	msm_dp_unregister_audio_driver(dev, dp->audio);
319 	msm_dp_aux_unregister(dp->aux);
320 	dp->drm_dev = NULL;
321 	dp->aux->drm_dev = NULL;
322 	priv->dp[dp->id] = NULL;
323 }
324 
325 static const struct component_ops msm_dp_display_comp_ops = {
326 	.bind = msm_dp_display_bind,
327 	.unbind = msm_dp_display_unbind,
328 };
329 
msm_dp_display_send_hpd_event(struct msm_dp * msm_dp_display)330 static void msm_dp_display_send_hpd_event(struct msm_dp *msm_dp_display)
331 {
332 	struct msm_dp_display_private *dp;
333 	struct drm_connector *connector;
334 
335 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
336 
337 	connector = dp->msm_dp_display.connector;
338 	drm_helper_hpd_irq_event(connector->dev);
339 }
340 
msm_dp_display_send_hpd_notification(struct msm_dp_display_private * dp,bool hpd)341 static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *dp,
342 					    bool hpd)
343 {
344 	if ((hpd && dp->msm_dp_display.link_ready) ||
345 			(!hpd && !dp->msm_dp_display.link_ready)) {
346 		drm_dbg_dp(dp->drm_dev, "HPD already %s\n",
347 				(hpd ? "on" : "off"));
348 		return 0;
349 	}
350 
351 	/* reset video pattern flag on disconnect */
352 	if (!hpd) {
353 		dp->panel->video_test = false;
354 		if (!dp->msm_dp_display.is_edp)
355 			drm_dp_set_subconnector_property(dp->msm_dp_display.connector,
356 							 connector_status_disconnected,
357 							 dp->panel->dpcd,
358 							 dp->panel->downstream_ports);
359 	}
360 
361 	dp->msm_dp_display.link_ready = hpd;
362 
363 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
364 			dp->msm_dp_display.connector_type, hpd);
365 	msm_dp_display_send_hpd_event(&dp->msm_dp_display);
366 
367 	return 0;
368 }
369 
msm_dp_display_process_hpd_high(struct msm_dp_display_private * dp)370 static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp)
371 {
372 	struct drm_connector *connector = dp->msm_dp_display.connector;
373 	const struct drm_display_info *info = &connector->display_info;
374 	int rc = 0;
375 
376 	rc = msm_dp_panel_read_sink_caps(dp->panel, connector);
377 	if (rc)
378 		goto end;
379 
380 	msm_dp_link_process_request(dp->link);
381 
382 	if (!dp->msm_dp_display.is_edp)
383 		drm_dp_set_subconnector_property(connector,
384 						 connector_status_connected,
385 						 dp->panel->dpcd,
386 						 dp->panel->downstream_ports);
387 
388 	dp->msm_dp_display.psr_supported = dp->panel->psr_cap.version && psr_enabled;
389 
390 	dp->audio_supported = info->has_audio;
391 	msm_dp_panel_handle_sink_request(dp->panel);
392 
393 	/*
394 	 * set sink to normal operation mode -- D0
395 	 * before dpcd read
396 	 */
397 	msm_dp_link_psm_config(dp->link, &dp->panel->link_info, false);
398 
399 	msm_dp_link_reset_phy_params_vx_px(dp->link);
400 	rc = msm_dp_ctrl_on_link(dp->ctrl);
401 	if (rc) {
402 		DRM_ERROR("failed to complete DP link training\n");
403 		goto end;
404 	}
405 
406 	msm_dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
407 
408 end:
409 	return rc;
410 }
411 
msm_dp_display_host_phy_init(struct msm_dp_display_private * dp)412 static void msm_dp_display_host_phy_init(struct msm_dp_display_private *dp)
413 {
414 	drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
415 		dp->msm_dp_display.connector_type, dp->core_initialized,
416 		dp->phy_initialized);
417 
418 	if (!dp->phy_initialized) {
419 		msm_dp_ctrl_phy_init(dp->ctrl);
420 		dp->phy_initialized = true;
421 	}
422 }
423 
msm_dp_display_host_phy_exit(struct msm_dp_display_private * dp)424 static void msm_dp_display_host_phy_exit(struct msm_dp_display_private *dp)
425 {
426 	drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
427 		dp->msm_dp_display.connector_type, dp->core_initialized,
428 		dp->phy_initialized);
429 
430 	if (dp->phy_initialized) {
431 		msm_dp_ctrl_phy_exit(dp->ctrl);
432 		dp->phy_initialized = false;
433 	}
434 }
435 
msm_dp_display_host_init(struct msm_dp_display_private * dp)436 static void msm_dp_display_host_init(struct msm_dp_display_private *dp)
437 {
438 	drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
439 		dp->msm_dp_display.connector_type, dp->core_initialized,
440 		dp->phy_initialized);
441 
442 	msm_dp_ctrl_core_clk_enable(dp->ctrl);
443 	msm_dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
444 	msm_dp_aux_init(dp->aux);
445 	dp->core_initialized = true;
446 }
447 
msm_dp_display_host_deinit(struct msm_dp_display_private * dp)448 static void msm_dp_display_host_deinit(struct msm_dp_display_private *dp)
449 {
450 	drm_dbg_dp(dp->drm_dev, "type=%d core_init=%d phy_init=%d\n",
451 		dp->msm_dp_display.connector_type, dp->core_initialized,
452 		dp->phy_initialized);
453 
454 	msm_dp_ctrl_reset_irq_ctrl(dp->ctrl, false);
455 	msm_dp_aux_deinit(dp->aux);
456 	msm_dp_ctrl_core_clk_disable(dp->ctrl);
457 	dp->core_initialized = false;
458 }
459 
msm_dp_display_usbpd_configure_cb(struct device * dev)460 static int msm_dp_display_usbpd_configure_cb(struct device *dev)
461 {
462 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
463 
464 	msm_dp_display_host_phy_init(dp);
465 
466 	return msm_dp_display_process_hpd_high(dp);
467 }
468 
msm_dp_display_notify_disconnect(struct device * dev)469 static int msm_dp_display_notify_disconnect(struct device *dev)
470 {
471 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
472 
473 	msm_dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
474 
475 	return 0;
476 }
477 
msm_dp_display_handle_video_request(struct msm_dp_display_private * dp)478 static void msm_dp_display_handle_video_request(struct msm_dp_display_private *dp)
479 {
480 	if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
481 		dp->panel->video_test = true;
482 		msm_dp_link_send_test_response(dp->link);
483 	}
484 }
485 
msm_dp_display_handle_port_status_changed(struct msm_dp_display_private * dp)486 static int msm_dp_display_handle_port_status_changed(struct msm_dp_display_private *dp)
487 {
488 	int rc = 0;
489 
490 	if (drm_dp_is_branch(dp->panel->dpcd) && dp->link->sink_count == 0) {
491 		drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
492 		if (dp->hpd_state != ST_DISCONNECTED) {
493 			dp->hpd_state = ST_DISCONNECT_PENDING;
494 			msm_dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
495 		}
496 	} else {
497 		if (dp->hpd_state == ST_DISCONNECTED) {
498 			dp->hpd_state = ST_MAINLINK_READY;
499 			rc = msm_dp_display_process_hpd_high(dp);
500 			if (rc)
501 				dp->hpd_state = ST_DISCONNECTED;
502 		}
503 	}
504 
505 	return rc;
506 }
507 
msm_dp_display_handle_irq_hpd(struct msm_dp_display_private * dp)508 static int msm_dp_display_handle_irq_hpd(struct msm_dp_display_private *dp)
509 {
510 	u32 sink_request = dp->link->sink_request;
511 
512 	drm_dbg_dp(dp->drm_dev, "%d\n", sink_request);
513 	if (dp->hpd_state == ST_DISCONNECTED) {
514 		if (sink_request & DP_LINK_STATUS_UPDATED) {
515 			drm_dbg_dp(dp->drm_dev, "Disconnected sink_request: %d\n",
516 							sink_request);
517 			DRM_ERROR("Disconnected, no DP_LINK_STATUS_UPDATED\n");
518 			return -EINVAL;
519 		}
520 	}
521 
522 	msm_dp_ctrl_handle_sink_request(dp->ctrl);
523 
524 	if (sink_request & DP_TEST_LINK_VIDEO_PATTERN)
525 		msm_dp_display_handle_video_request(dp);
526 
527 	return 0;
528 }
529 
msm_dp_display_usbpd_attention_cb(struct device * dev)530 static int msm_dp_display_usbpd_attention_cb(struct device *dev)
531 {
532 	int rc = 0;
533 	u32 sink_request;
534 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
535 
536 	/* check for any test request issued by sink */
537 	rc = msm_dp_link_process_request(dp->link);
538 	if (!rc) {
539 		sink_request = dp->link->sink_request;
540 		drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
541 					dp->hpd_state, sink_request);
542 		if (sink_request & DS_PORT_STATUS_CHANGED)
543 			rc = msm_dp_display_handle_port_status_changed(dp);
544 		else
545 			rc = msm_dp_display_handle_irq_hpd(dp);
546 	}
547 
548 	return rc;
549 }
550 
msm_dp_hpd_plug_handle(struct msm_dp_display_private * dp,u32 data)551 static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp, u32 data)
552 {
553 	u32 state;
554 	int ret;
555 	struct platform_device *pdev = dp->msm_dp_display.pdev;
556 
557 	msm_dp_aux_enable_xfers(dp->aux, true);
558 
559 	mutex_lock(&dp->event_mutex);
560 
561 	state =  dp->hpd_state;
562 	drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
563 			dp->msm_dp_display.connector_type, state);
564 
565 	if (state == ST_DISPLAY_OFF) {
566 		mutex_unlock(&dp->event_mutex);
567 		return 0;
568 	}
569 
570 	if (state == ST_MAINLINK_READY || state == ST_CONNECTED) {
571 		mutex_unlock(&dp->event_mutex);
572 		return 0;
573 	}
574 
575 	if (state == ST_DISCONNECT_PENDING) {
576 		/* wait until ST_DISCONNECTED */
577 		msm_dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
578 		mutex_unlock(&dp->event_mutex);
579 		return 0;
580 	}
581 
582 	ret = pm_runtime_resume_and_get(&pdev->dev);
583 	if (ret) {
584 		DRM_ERROR("failed to pm_runtime_resume\n");
585 		mutex_unlock(&dp->event_mutex);
586 		return ret;
587 	}
588 
589 	ret = msm_dp_display_usbpd_configure_cb(&pdev->dev);
590 	if (ret) {	/* link train failed */
591 		dp->hpd_state = ST_DISCONNECTED;
592 		pm_runtime_put_sync(&pdev->dev);
593 	} else {
594 		dp->hpd_state = ST_MAINLINK_READY;
595 	}
596 
597 	drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
598 			dp->msm_dp_display.connector_type, state);
599 	mutex_unlock(&dp->event_mutex);
600 
601 	/* uevent will complete connection part */
602 	return 0;
603 };
604 
msm_dp_display_handle_plugged_change(struct msm_dp * msm_dp_display,bool plugged)605 static void msm_dp_display_handle_plugged_change(struct msm_dp *msm_dp_display,
606 		bool plugged)
607 {
608 	struct msm_dp_display_private *dp;
609 
610 	dp = container_of(msm_dp_display,
611 			struct msm_dp_display_private, msm_dp_display);
612 
613 	/* notify audio subsystem only if sink supports audio */
614 	if (msm_dp_display->plugged_cb && msm_dp_display->codec_dev &&
615 			dp->audio_supported)
616 		msm_dp_display->plugged_cb(msm_dp_display->codec_dev, plugged);
617 }
618 
msm_dp_hpd_unplug_handle(struct msm_dp_display_private * dp,u32 data)619 static int msm_dp_hpd_unplug_handle(struct msm_dp_display_private *dp, u32 data)
620 {
621 	u32 state;
622 	struct platform_device *pdev = dp->msm_dp_display.pdev;
623 
624 	msm_dp_aux_enable_xfers(dp->aux, false);
625 
626 	mutex_lock(&dp->event_mutex);
627 
628 	state = dp->hpd_state;
629 
630 	drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
631 			dp->msm_dp_display.connector_type, state);
632 
633 	/* unplugged, no more irq_hpd handle */
634 	msm_dp_del_event(dp, EV_IRQ_HPD_INT);
635 
636 	if (state == ST_DISCONNECTED) {
637 		/* triggered by irq_hdp with sink_count = 0 */
638 		if (dp->link->sink_count == 0) {
639 			msm_dp_display_host_phy_exit(dp);
640 		}
641 		msm_dp_display_notify_disconnect(&dp->msm_dp_display.pdev->dev);
642 		mutex_unlock(&dp->event_mutex);
643 		return 0;
644 	} else if (state == ST_DISCONNECT_PENDING) {
645 		mutex_unlock(&dp->event_mutex);
646 		return 0;
647 	} else if (state == ST_MAINLINK_READY) {
648 		msm_dp_ctrl_off_link(dp->ctrl);
649 		msm_dp_display_host_phy_exit(dp);
650 		dp->hpd_state = ST_DISCONNECTED;
651 		msm_dp_display_notify_disconnect(&dp->msm_dp_display.pdev->dev);
652 		pm_runtime_put_sync(&pdev->dev);
653 		mutex_unlock(&dp->event_mutex);
654 		return 0;
655 	}
656 
657 	/*
658 	 * We don't need separate work for disconnect as
659 	 * connect/attention interrupts are disabled
660 	 */
661 	msm_dp_display_notify_disconnect(&dp->msm_dp_display.pdev->dev);
662 
663 	if (state == ST_DISPLAY_OFF) {
664 		dp->hpd_state = ST_DISCONNECTED;
665 	} else {
666 		dp->hpd_state = ST_DISCONNECT_PENDING;
667 	}
668 
669 	/* signal the disconnect event early to ensure proper teardown */
670 	msm_dp_display_handle_plugged_change(&dp->msm_dp_display, false);
671 
672 	drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
673 			dp->msm_dp_display.connector_type, state);
674 
675 	/* uevent will complete disconnection part */
676 	pm_runtime_put_sync(&pdev->dev);
677 	mutex_unlock(&dp->event_mutex);
678 	return 0;
679 }
680 
msm_dp_irq_hpd_handle(struct msm_dp_display_private * dp,u32 data)681 static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp, u32 data)
682 {
683 	u32 state;
684 
685 	mutex_lock(&dp->event_mutex);
686 
687 	/* irq_hpd can happen at either connected or disconnected state */
688 	state =  dp->hpd_state;
689 	drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
690 			dp->msm_dp_display.connector_type, state);
691 
692 	if (state == ST_DISPLAY_OFF) {
693 		mutex_unlock(&dp->event_mutex);
694 		return 0;
695 	}
696 
697 	if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
698 		/* wait until ST_CONNECTED */
699 		msm_dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
700 		mutex_unlock(&dp->event_mutex);
701 		return 0;
702 	}
703 
704 	msm_dp_display_usbpd_attention_cb(&dp->msm_dp_display.pdev->dev);
705 
706 	drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
707 			dp->msm_dp_display.connector_type, state);
708 
709 	mutex_unlock(&dp->event_mutex);
710 
711 	return 0;
712 }
713 
msm_dp_display_deinit_sub_modules(struct msm_dp_display_private * dp)714 static void msm_dp_display_deinit_sub_modules(struct msm_dp_display_private *dp)
715 {
716 	msm_dp_audio_put(dp->audio);
717 	msm_dp_panel_put(dp->panel);
718 	msm_dp_aux_put(dp->aux);
719 }
720 
msm_dp_init_sub_modules(struct msm_dp_display_private * dp)721 static int msm_dp_init_sub_modules(struct msm_dp_display_private *dp)
722 {
723 	int rc = 0;
724 	struct device *dev = &dp->msm_dp_display.pdev->dev;
725 	struct phy *phy;
726 
727 	phy = devm_phy_get(dev, "dp");
728 	if (IS_ERR(phy))
729 		return PTR_ERR(phy);
730 
731 	rc = phy_set_mode_ext(phy, PHY_MODE_DP,
732 			      dp->msm_dp_display.is_edp ? PHY_SUBMODE_EDP : PHY_SUBMODE_DP);
733 	if (rc) {
734 		DRM_ERROR("failed to set phy submode, rc = %d\n", rc);
735 		dp->catalog = NULL;
736 		goto error;
737 	}
738 
739 	dp->catalog = msm_dp_catalog_get(dev);
740 	if (IS_ERR(dp->catalog)) {
741 		rc = PTR_ERR(dp->catalog);
742 		DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
743 		dp->catalog = NULL;
744 		goto error;
745 	}
746 
747 	dp->aux = msm_dp_aux_get(dev, dp->catalog,
748 			     phy,
749 			     dp->msm_dp_display.is_edp);
750 	if (IS_ERR(dp->aux)) {
751 		rc = PTR_ERR(dp->aux);
752 		DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
753 		dp->aux = NULL;
754 		goto error;
755 	}
756 
757 	dp->link = msm_dp_link_get(dev, dp->aux);
758 	if (IS_ERR(dp->link)) {
759 		rc = PTR_ERR(dp->link);
760 		DRM_ERROR("failed to initialize link, rc = %d\n", rc);
761 		dp->link = NULL;
762 		goto error_link;
763 	}
764 
765 	dp->panel = msm_dp_panel_get(dev, dp->aux, dp->link, dp->catalog);
766 	if (IS_ERR(dp->panel)) {
767 		rc = PTR_ERR(dp->panel);
768 		DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
769 		dp->panel = NULL;
770 		goto error_link;
771 	}
772 
773 	dp->ctrl = msm_dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
774 			       dp->catalog,
775 			       phy);
776 	if (IS_ERR(dp->ctrl)) {
777 		rc = PTR_ERR(dp->ctrl);
778 		DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
779 		dp->ctrl = NULL;
780 		goto error_ctrl;
781 	}
782 
783 	dp->audio = msm_dp_audio_get(dp->msm_dp_display.pdev, dp->catalog);
784 	if (IS_ERR(dp->audio)) {
785 		rc = PTR_ERR(dp->audio);
786 		pr_err("failed to initialize audio, rc = %d\n", rc);
787 		dp->audio = NULL;
788 		goto error_ctrl;
789 	}
790 
791 	return rc;
792 
793 error_ctrl:
794 	msm_dp_panel_put(dp->panel);
795 error_link:
796 	msm_dp_aux_put(dp->aux);
797 error:
798 	return rc;
799 }
800 
msm_dp_display_set_mode(struct msm_dp * msm_dp_display,struct msm_dp_display_mode * mode)801 static int msm_dp_display_set_mode(struct msm_dp *msm_dp_display,
802 			       struct msm_dp_display_mode *mode)
803 {
804 	struct msm_dp_display_private *dp;
805 
806 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
807 
808 	drm_mode_copy(&dp->panel->msm_dp_mode.drm_mode, &mode->drm_mode);
809 	dp->panel->msm_dp_mode.bpp = mode->bpp;
810 	dp->panel->msm_dp_mode.out_fmt_is_yuv_420 = mode->out_fmt_is_yuv_420;
811 	msm_dp_panel_init_panel_info(dp->panel);
812 	return 0;
813 }
814 
msm_dp_display_enable(struct msm_dp_display_private * dp,bool force_link_train)815 static int msm_dp_display_enable(struct msm_dp_display_private *dp, bool force_link_train)
816 {
817 	int rc = 0;
818 	struct msm_dp *msm_dp_display = &dp->msm_dp_display;
819 
820 	drm_dbg_dp(dp->drm_dev, "sink_count=%d\n", dp->link->sink_count);
821 	if (msm_dp_display->power_on) {
822 		drm_dbg_dp(dp->drm_dev, "Link already setup, return\n");
823 		return 0;
824 	}
825 
826 	rc = msm_dp_ctrl_on_stream(dp->ctrl, force_link_train);
827 	if (!rc)
828 		msm_dp_display->power_on = true;
829 
830 	return rc;
831 }
832 
msm_dp_display_post_enable(struct msm_dp * msm_dp_display)833 static int msm_dp_display_post_enable(struct msm_dp *msm_dp_display)
834 {
835 	struct msm_dp_display_private *dp;
836 	u32 rate;
837 
838 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
839 
840 	rate = dp->link->link_params.rate;
841 
842 	if (dp->audio_supported) {
843 		dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
844 		dp->audio->lane_count = dp->link->link_params.num_lanes;
845 	}
846 
847 	/* signal the connect event late to synchronize video and display */
848 	msm_dp_display_handle_plugged_change(msm_dp_display, true);
849 
850 	if (msm_dp_display->psr_supported)
851 		msm_dp_ctrl_config_psr(dp->ctrl);
852 
853 	return 0;
854 }
855 
msm_dp_display_disable(struct msm_dp_display_private * dp)856 static int msm_dp_display_disable(struct msm_dp_display_private *dp)
857 {
858 	struct msm_dp *msm_dp_display = &dp->msm_dp_display;
859 
860 	if (!msm_dp_display->power_on)
861 		return 0;
862 
863 	/* wait only if audio was enabled */
864 	if (msm_dp_display->audio_enabled) {
865 		/* signal the disconnect event */
866 		msm_dp_display_handle_plugged_change(msm_dp_display, false);
867 		if (!wait_for_completion_timeout(&dp->audio_comp,
868 				HZ * 5))
869 			DRM_ERROR("audio comp timeout\n");
870 	}
871 
872 	msm_dp_display->audio_enabled = false;
873 
874 	if (dp->link->sink_count == 0) {
875 		/*
876 		 * irq_hpd with sink_count = 0
877 		 * hdmi unplugged out of dongle
878 		 */
879 		msm_dp_ctrl_off_link_stream(dp->ctrl);
880 	} else {
881 		/*
882 		 * unplugged interrupt
883 		 * dongle unplugged out of DUT
884 		 */
885 		msm_dp_ctrl_off(dp->ctrl);
886 		msm_dp_display_host_phy_exit(dp);
887 	}
888 
889 	msm_dp_display->power_on = false;
890 
891 	drm_dbg_dp(dp->drm_dev, "sink count: %d\n", dp->link->sink_count);
892 	return 0;
893 }
894 
msm_dp_display_set_plugged_cb(struct msm_dp * msm_dp_display,hdmi_codec_plugged_cb fn,struct device * codec_dev)895 int msm_dp_display_set_plugged_cb(struct msm_dp *msm_dp_display,
896 		hdmi_codec_plugged_cb fn, struct device *codec_dev)
897 {
898 	bool plugged;
899 
900 	msm_dp_display->plugged_cb = fn;
901 	msm_dp_display->codec_dev = codec_dev;
902 	plugged = msm_dp_display->link_ready;
903 	msm_dp_display_handle_plugged_change(msm_dp_display, plugged);
904 
905 	return 0;
906 }
907 
908 /**
909  * msm_dp_bridge_mode_valid - callback to determine if specified mode is valid
910  * @bridge: Pointer to drm bridge structure
911  * @info: display info
912  * @mode: Pointer to drm mode structure
913  * Returns: Validity status for specified mode
914  */
msm_dp_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)915 enum drm_mode_status msm_dp_bridge_mode_valid(struct drm_bridge *bridge,
916 					  const struct drm_display_info *info,
917 					  const struct drm_display_mode *mode)
918 {
919 	const u32 num_components = 3, default_bpp = 24;
920 	struct msm_dp_display_private *msm_dp_display;
921 	struct msm_dp_link_info *link_info;
922 	u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
923 	struct msm_dp *dp;
924 	int mode_pclk_khz = mode->clock;
925 
926 	dp = to_dp_bridge(bridge)->msm_dp_display;
927 
928 	if (!dp || !mode_pclk_khz || !dp->connector) {
929 		DRM_ERROR("invalid params\n");
930 		return -EINVAL;
931 	}
932 
933 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
934 	link_info = &msm_dp_display->panel->link_info;
935 
936 	if ((drm_mode_is_420_only(&dp->connector->display_info, mode) &&
937 	     msm_dp_display->panel->vsc_sdp_supported) ||
938 	     msm_dp_wide_bus_available(dp))
939 		mode_pclk_khz /= 2;
940 
941 	if (mode_pclk_khz > DP_MAX_PIXEL_CLK_KHZ)
942 		return MODE_CLOCK_HIGH;
943 
944 	mode_bpp = dp->connector->display_info.bpc * num_components;
945 	if (!mode_bpp)
946 		mode_bpp = default_bpp;
947 
948 	mode_bpp = msm_dp_panel_get_mode_bpp(msm_dp_display->panel,
949 			mode_bpp, mode_pclk_khz);
950 
951 	mode_rate_khz = mode_pclk_khz * mode_bpp;
952 	supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
953 
954 	if (mode_rate_khz > supported_rate_khz)
955 		return MODE_BAD;
956 
957 	return MODE_OK;
958 }
959 
msm_dp_display_get_modes(struct msm_dp * dp)960 int msm_dp_display_get_modes(struct msm_dp *dp)
961 {
962 	struct msm_dp_display_private *msm_dp_display;
963 
964 	if (!dp) {
965 		DRM_ERROR("invalid params\n");
966 		return 0;
967 	}
968 
969 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
970 
971 	return msm_dp_panel_get_modes(msm_dp_display->panel,
972 		dp->connector);
973 }
974 
msm_dp_display_check_video_test(struct msm_dp * dp)975 bool msm_dp_display_check_video_test(struct msm_dp *dp)
976 {
977 	struct msm_dp_display_private *msm_dp_display;
978 
979 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
980 
981 	return msm_dp_display->panel->video_test;
982 }
983 
msm_dp_display_get_test_bpp(struct msm_dp * dp)984 int msm_dp_display_get_test_bpp(struct msm_dp *dp)
985 {
986 	struct msm_dp_display_private *msm_dp_display;
987 
988 	if (!dp) {
989 		DRM_ERROR("invalid params\n");
990 		return 0;
991 	}
992 
993 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
994 
995 	return msm_dp_link_bit_depth_to_bpp(
996 		msm_dp_display->link->test_video.test_bit_depth);
997 }
998 
msm_dp_snapshot(struct msm_disp_state * disp_state,struct msm_dp * dp)999 void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
1000 {
1001 	struct msm_dp_display_private *msm_dp_display;
1002 
1003 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
1004 
1005 	/*
1006 	 * if we are reading registers we need the link clocks to be on
1007 	 * however till DP cable is connected this will not happen as we
1008 	 * do not know the resolution to power up with. Hence check the
1009 	 * power_on status before dumping DP registers to avoid crash due
1010 	 * to unclocked access
1011 	 */
1012 	mutex_lock(&msm_dp_display->event_mutex);
1013 
1014 	if (!dp->power_on) {
1015 		mutex_unlock(&msm_dp_display->event_mutex);
1016 		return;
1017 	}
1018 
1019 	msm_dp_catalog_snapshot(msm_dp_display->catalog, disp_state);
1020 
1021 	mutex_unlock(&msm_dp_display->event_mutex);
1022 }
1023 
msm_dp_display_set_psr(struct msm_dp * msm_dp_display,bool enter)1024 void msm_dp_display_set_psr(struct msm_dp *msm_dp_display, bool enter)
1025 {
1026 	struct msm_dp_display_private *dp;
1027 
1028 	if (!msm_dp_display) {
1029 		DRM_ERROR("invalid params\n");
1030 		return;
1031 	}
1032 
1033 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1034 	msm_dp_ctrl_set_psr(dp->ctrl, enter);
1035 }
1036 
hpd_event_thread(void * data)1037 static int hpd_event_thread(void *data)
1038 {
1039 	struct msm_dp_display_private *msm_dp_priv;
1040 	unsigned long flag;
1041 	struct msm_dp_event *todo;
1042 	int timeout_mode = 0;
1043 
1044 	msm_dp_priv = (struct msm_dp_display_private *)data;
1045 
1046 	while (1) {
1047 		if (timeout_mode) {
1048 			wait_event_timeout(msm_dp_priv->event_q,
1049 				(msm_dp_priv->event_pndx == msm_dp_priv->event_gndx) ||
1050 					kthread_should_stop(), EVENT_TIMEOUT);
1051 		} else {
1052 			wait_event_interruptible(msm_dp_priv->event_q,
1053 				(msm_dp_priv->event_pndx != msm_dp_priv->event_gndx) ||
1054 					kthread_should_stop());
1055 		}
1056 
1057 		if (kthread_should_stop())
1058 			break;
1059 
1060 		spin_lock_irqsave(&msm_dp_priv->event_lock, flag);
1061 		todo = &msm_dp_priv->event_list[msm_dp_priv->event_gndx];
1062 		if (todo->delay) {
1063 			struct msm_dp_event *todo_next;
1064 
1065 			msm_dp_priv->event_gndx++;
1066 			msm_dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1067 
1068 			/* re enter delay event into q */
1069 			todo_next = &msm_dp_priv->event_list[msm_dp_priv->event_pndx++];
1070 			msm_dp_priv->event_pndx %= DP_EVENT_Q_MAX;
1071 			todo_next->event_id = todo->event_id;
1072 			todo_next->data = todo->data;
1073 			todo_next->delay = todo->delay - 1;
1074 
1075 			/* clean up older event */
1076 			todo->event_id = EV_NO_EVENT;
1077 			todo->delay = 0;
1078 
1079 			/* switch to timeout mode */
1080 			timeout_mode = 1;
1081 			spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
1082 			continue;
1083 		}
1084 
1085 		/* timeout with no events in q */
1086 		if (msm_dp_priv->event_pndx == msm_dp_priv->event_gndx) {
1087 			spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
1088 			continue;
1089 		}
1090 
1091 		msm_dp_priv->event_gndx++;
1092 		msm_dp_priv->event_gndx %= DP_EVENT_Q_MAX;
1093 		timeout_mode = 0;
1094 		spin_unlock_irqrestore(&msm_dp_priv->event_lock, flag);
1095 
1096 		switch (todo->event_id) {
1097 		case EV_HPD_PLUG_INT:
1098 			msm_dp_hpd_plug_handle(msm_dp_priv, todo->data);
1099 			break;
1100 		case EV_HPD_UNPLUG_INT:
1101 			msm_dp_hpd_unplug_handle(msm_dp_priv, todo->data);
1102 			break;
1103 		case EV_IRQ_HPD_INT:
1104 			msm_dp_irq_hpd_handle(msm_dp_priv, todo->data);
1105 			break;
1106 		case EV_USER_NOTIFICATION:
1107 			msm_dp_display_send_hpd_notification(msm_dp_priv,
1108 						todo->data);
1109 			break;
1110 		default:
1111 			break;
1112 		}
1113 	}
1114 
1115 	return 0;
1116 }
1117 
msm_dp_hpd_event_thread_start(struct msm_dp_display_private * msm_dp_priv)1118 static int msm_dp_hpd_event_thread_start(struct msm_dp_display_private *msm_dp_priv)
1119 {
1120 	/* set event q to empty */
1121 	msm_dp_priv->event_gndx = 0;
1122 	msm_dp_priv->event_pndx = 0;
1123 
1124 	msm_dp_priv->ev_tsk = kthread_run(hpd_event_thread, msm_dp_priv, "dp_hpd_handler");
1125 	if (IS_ERR(msm_dp_priv->ev_tsk))
1126 		return PTR_ERR(msm_dp_priv->ev_tsk);
1127 
1128 	return 0;
1129 }
1130 
msm_dp_display_irq_handler(int irq,void * dev_id)1131 static irqreturn_t msm_dp_display_irq_handler(int irq, void *dev_id)
1132 {
1133 	struct msm_dp_display_private *dp = dev_id;
1134 	irqreturn_t ret = IRQ_NONE;
1135 	u32 hpd_isr_status;
1136 
1137 	if (!dp) {
1138 		DRM_ERROR("invalid data\n");
1139 		return IRQ_NONE;
1140 	}
1141 
1142 	hpd_isr_status = msm_dp_catalog_hpd_get_intr_status(dp->catalog);
1143 
1144 	if (hpd_isr_status & 0x0F) {
1145 		drm_dbg_dp(dp->drm_dev, "type=%d isr=0x%x\n",
1146 			dp->msm_dp_display.connector_type, hpd_isr_status);
1147 		/* hpd related interrupts */
1148 		if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK)
1149 			msm_dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1150 
1151 		if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
1152 			msm_dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
1153 		}
1154 
1155 		if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
1156 			msm_dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1157 			msm_dp_add_event(dp, EV_HPD_PLUG_INT, 0, 3);
1158 		}
1159 
1160 		if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
1161 			msm_dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1162 
1163 		ret = IRQ_HANDLED;
1164 	}
1165 
1166 	/* DP controller isr */
1167 	ret |= msm_dp_ctrl_isr(dp->ctrl);
1168 
1169 	/* DP aux isr */
1170 	ret |= msm_dp_aux_isr(dp->aux);
1171 
1172 	return ret;
1173 }
1174 
msm_dp_display_request_irq(struct msm_dp_display_private * dp)1175 static int msm_dp_display_request_irq(struct msm_dp_display_private *dp)
1176 {
1177 	int rc = 0;
1178 	struct platform_device *pdev = dp->msm_dp_display.pdev;
1179 
1180 	dp->irq = platform_get_irq(pdev, 0);
1181 	if (dp->irq < 0) {
1182 		DRM_ERROR("failed to get irq\n");
1183 		return dp->irq;
1184 	}
1185 
1186 	rc = devm_request_irq(&pdev->dev, dp->irq, msm_dp_display_irq_handler,
1187 			      IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
1188 			      "dp_display_isr", dp);
1189 
1190 	if (rc < 0) {
1191 		DRM_ERROR("failed to request IRQ%u: %d\n",
1192 				dp->irq, rc);
1193 		return rc;
1194 	}
1195 
1196 	return 0;
1197 }
1198 
msm_dp_display_get_desc(struct platform_device * pdev)1199 static const struct msm_dp_desc *msm_dp_display_get_desc(struct platform_device *pdev)
1200 {
1201 	const struct msm_dp_desc *descs = of_device_get_match_data(&pdev->dev);
1202 	struct resource *res;
1203 	int i;
1204 
1205 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1206 	if (!res)
1207 		return NULL;
1208 
1209 	for (i = 0; i < descs[i].io_start; i++) {
1210 		if (descs[i].io_start == res->start)
1211 			return &descs[i];
1212 	}
1213 
1214 	dev_err(&pdev->dev, "unknown displayport instance\n");
1215 	return NULL;
1216 }
1217 
msm_dp_display_probe_tail(struct device * dev)1218 static int msm_dp_display_probe_tail(struct device *dev)
1219 {
1220 	struct msm_dp *dp = dev_get_drvdata(dev);
1221 	int ret;
1222 
1223 	/*
1224 	 * External bridges are mandatory for eDP interfaces: one has to
1225 	 * provide at least an eDP panel (which gets wrapped into panel-bridge).
1226 	 *
1227 	 * For DisplayPort interfaces external bridges are optional, so
1228 	 * silently ignore an error if one is not present (-ENODEV).
1229 	 */
1230 	dp->next_bridge = devm_drm_of_get_bridge(&dp->pdev->dev, dp->pdev->dev.of_node, 1, 0);
1231 	if (IS_ERR(dp->next_bridge)) {
1232 		ret = PTR_ERR(dp->next_bridge);
1233 		dp->next_bridge = NULL;
1234 		if (dp->is_edp || ret != -ENODEV)
1235 			return ret;
1236 	}
1237 
1238 	ret = component_add(dev, &msm_dp_display_comp_ops);
1239 	if (ret)
1240 		DRM_ERROR("component add failed, rc=%d\n", ret);
1241 
1242 	return ret;
1243 }
1244 
msm_dp_auxbus_done_probe(struct drm_dp_aux * aux)1245 static int msm_dp_auxbus_done_probe(struct drm_dp_aux *aux)
1246 {
1247 	return msm_dp_display_probe_tail(aux->dev);
1248 }
1249 
msm_dp_display_get_connector_type(struct platform_device * pdev,const struct msm_dp_desc * desc)1250 static int msm_dp_display_get_connector_type(struct platform_device *pdev,
1251 					 const struct msm_dp_desc *desc)
1252 {
1253 	struct device_node *node = pdev->dev.of_node;
1254 	struct device_node *aux_bus = of_get_child_by_name(node, "aux-bus");
1255 	struct device_node *panel = of_get_child_by_name(aux_bus, "panel");
1256 	int connector_type;
1257 
1258 	if (panel)
1259 		connector_type = DRM_MODE_CONNECTOR_eDP;
1260 	else
1261 		connector_type = DRM_MODE_SUBCONNECTOR_DisplayPort;
1262 
1263 	of_node_put(panel);
1264 	of_node_put(aux_bus);
1265 
1266 	return connector_type;
1267 }
1268 
msm_dp_display_probe(struct platform_device * pdev)1269 static int msm_dp_display_probe(struct platform_device *pdev)
1270 {
1271 	int rc = 0;
1272 	struct msm_dp_display_private *dp;
1273 	const struct msm_dp_desc *desc;
1274 
1275 	if (!pdev || !pdev->dev.of_node) {
1276 		DRM_ERROR("pdev not found\n");
1277 		return -ENODEV;
1278 	}
1279 
1280 	dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
1281 	if (!dp)
1282 		return -ENOMEM;
1283 
1284 	desc = msm_dp_display_get_desc(pdev);
1285 	if (!desc)
1286 		return -EINVAL;
1287 
1288 	dp->msm_dp_display.pdev = pdev;
1289 	dp->id = desc->id;
1290 	dp->msm_dp_display.connector_type = msm_dp_display_get_connector_type(pdev, desc);
1291 	dp->wide_bus_supported = desc->wide_bus_supported;
1292 	dp->msm_dp_display.is_edp =
1293 		(dp->msm_dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
1294 
1295 	rc = msm_dp_init_sub_modules(dp);
1296 	if (rc) {
1297 		DRM_ERROR("init sub module failed\n");
1298 		return -EPROBE_DEFER;
1299 	}
1300 
1301 	/* setup event q */
1302 	mutex_init(&dp->event_mutex);
1303 	init_waitqueue_head(&dp->event_q);
1304 	spin_lock_init(&dp->event_lock);
1305 
1306 	/* Store DP audio handle inside DP display */
1307 	dp->msm_dp_display.msm_dp_audio = dp->audio;
1308 
1309 	init_completion(&dp->audio_comp);
1310 
1311 	platform_set_drvdata(pdev, &dp->msm_dp_display);
1312 
1313 	rc = devm_pm_runtime_enable(&pdev->dev);
1314 	if (rc)
1315 		goto err;
1316 
1317 	rc = msm_dp_display_request_irq(dp);
1318 	if (rc)
1319 		goto err;
1320 
1321 	if (dp->msm_dp_display.is_edp) {
1322 		rc = devm_of_dp_aux_populate_bus(dp->aux, msm_dp_auxbus_done_probe);
1323 		if (rc) {
1324 			DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc);
1325 			goto err;
1326 		}
1327 	} else {
1328 		rc = msm_dp_display_probe_tail(&pdev->dev);
1329 		if (rc)
1330 			goto err;
1331 	}
1332 
1333 	return rc;
1334 
1335 err:
1336 	msm_dp_display_deinit_sub_modules(dp);
1337 	return rc;
1338 }
1339 
msm_dp_display_remove(struct platform_device * pdev)1340 static void msm_dp_display_remove(struct platform_device *pdev)
1341 {
1342 	struct msm_dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
1343 
1344 	component_del(&pdev->dev, &msm_dp_display_comp_ops);
1345 	msm_dp_display_deinit_sub_modules(dp);
1346 	platform_set_drvdata(pdev, NULL);
1347 }
1348 
msm_dp_pm_runtime_suspend(struct device * dev)1349 static int msm_dp_pm_runtime_suspend(struct device *dev)
1350 {
1351 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
1352 
1353 	disable_irq(dp->irq);
1354 
1355 	if (dp->msm_dp_display.is_edp) {
1356 		msm_dp_display_host_phy_exit(dp);
1357 		msm_dp_catalog_ctrl_hpd_disable(dp->catalog);
1358 	}
1359 	msm_dp_display_host_deinit(dp);
1360 
1361 	return 0;
1362 }
1363 
msm_dp_pm_runtime_resume(struct device * dev)1364 static int msm_dp_pm_runtime_resume(struct device *dev)
1365 {
1366 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
1367 
1368 	/*
1369 	 * for eDP, host cotroller, HPD block and PHY are enabled here
1370 	 * but with HPD irq disabled
1371 	 *
1372 	 * for DP, only host controller is enabled here.
1373 	 * HPD block is enabled at msm_dp_bridge_hpd_enable()
1374 	 * PHY will be enabled at plugin handler later
1375 	 */
1376 	msm_dp_display_host_init(dp);
1377 	if (dp->msm_dp_display.is_edp) {
1378 		msm_dp_catalog_ctrl_hpd_enable(dp->catalog);
1379 		msm_dp_display_host_phy_init(dp);
1380 	}
1381 
1382 	enable_irq(dp->irq);
1383 	return 0;
1384 }
1385 
1386 static const struct dev_pm_ops msm_dp_pm_ops = {
1387 	SET_RUNTIME_PM_OPS(msm_dp_pm_runtime_suspend, msm_dp_pm_runtime_resume, NULL)
1388 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1389 				pm_runtime_force_resume)
1390 };
1391 
1392 static struct platform_driver msm_dp_display_driver = {
1393 	.probe  = msm_dp_display_probe,
1394 	.remove = msm_dp_display_remove,
1395 	.driver = {
1396 		.name = "msm-dp-display",
1397 		.of_match_table = msm_dp_dt_match,
1398 		.suppress_bind_attrs = true,
1399 		.pm = &msm_dp_pm_ops,
1400 	},
1401 };
1402 
msm_dp_register(void)1403 int __init msm_dp_register(void)
1404 {
1405 	int ret;
1406 
1407 	ret = platform_driver_register(&msm_dp_display_driver);
1408 	if (ret)
1409 		DRM_ERROR("Dp display driver register failed");
1410 
1411 	return ret;
1412 }
1413 
msm_dp_unregister(void)1414 void __exit msm_dp_unregister(void)
1415 {
1416 	platform_driver_unregister(&msm_dp_display_driver);
1417 }
1418 
msm_dp_is_yuv_420_enabled(const struct msm_dp * msm_dp_display,const struct drm_display_mode * mode)1419 bool msm_dp_is_yuv_420_enabled(const struct msm_dp *msm_dp_display,
1420 			       const struct drm_display_mode *mode)
1421 {
1422 	struct msm_dp_display_private *dp;
1423 	const struct drm_display_info *info;
1424 
1425 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1426 	info = &msm_dp_display->connector->display_info;
1427 
1428 	return dp->panel->vsc_sdp_supported && drm_mode_is_420_only(info, mode);
1429 }
1430 
msm_dp_needs_periph_flush(const struct msm_dp * msm_dp_display,const struct drm_display_mode * mode)1431 bool msm_dp_needs_periph_flush(const struct msm_dp *msm_dp_display,
1432 			       const struct drm_display_mode *mode)
1433 {
1434 	return msm_dp_is_yuv_420_enabled(msm_dp_display, mode);
1435 }
1436 
msm_dp_wide_bus_available(const struct msm_dp * msm_dp_display)1437 bool msm_dp_wide_bus_available(const struct msm_dp *msm_dp_display)
1438 {
1439 	struct msm_dp_display_private *dp;
1440 
1441 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1442 
1443 	if (dp->msm_dp_mode.out_fmt_is_yuv_420)
1444 		return false;
1445 
1446 	return dp->wide_bus_supported;
1447 }
1448 
msm_dp_display_debugfs_init(struct msm_dp * msm_dp_display,struct dentry * root,bool is_edp)1449 void msm_dp_display_debugfs_init(struct msm_dp *msm_dp_display, struct dentry *root, bool is_edp)
1450 {
1451 	struct msm_dp_display_private *dp;
1452 	struct device *dev;
1453 	int rc;
1454 
1455 	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1456 	dev = &dp->msm_dp_display.pdev->dev;
1457 
1458 	rc = msm_dp_debug_init(dev, dp->panel, dp->link, dp->msm_dp_display.connector, root, is_edp);
1459 	if (rc)
1460 		DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
1461 }
1462 
msm_dp_modeset_init(struct msm_dp * msm_dp_display,struct drm_device * dev,struct drm_encoder * encoder,bool yuv_supported)1463 int msm_dp_modeset_init(struct msm_dp *msm_dp_display, struct drm_device *dev,
1464 			struct drm_encoder *encoder, bool yuv_supported)
1465 {
1466 	struct msm_dp_display_private *msm_dp_priv;
1467 	int ret;
1468 
1469 	msm_dp_display->drm_dev = dev;
1470 
1471 	msm_dp_priv = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1472 
1473 	ret = msm_dp_bridge_init(msm_dp_display, dev, encoder, yuv_supported);
1474 	if (ret) {
1475 		DRM_DEV_ERROR(dev->dev,
1476 			"failed to create dp bridge: %d\n", ret);
1477 		return ret;
1478 	}
1479 
1480 	msm_dp_display->connector = msm_dp_drm_connector_init(msm_dp_display, encoder);
1481 	if (IS_ERR(msm_dp_display->connector)) {
1482 		ret = PTR_ERR(msm_dp_display->connector);
1483 		DRM_DEV_ERROR(dev->dev,
1484 			"failed to create dp connector: %d\n", ret);
1485 		msm_dp_display->connector = NULL;
1486 		return ret;
1487 	}
1488 
1489 	msm_dp_priv->panel->connector = msm_dp_display->connector;
1490 
1491 	return 0;
1492 }
1493 
msm_dp_bridge_atomic_enable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1494 void msm_dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
1495 			     struct drm_bridge_state *old_bridge_state)
1496 {
1497 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(drm_bridge);
1498 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;
1499 	int rc = 0;
1500 	struct msm_dp_display_private *msm_dp_display;
1501 	u32 state;
1502 	bool force_link_train = false;
1503 
1504 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
1505 	if (!msm_dp_display->msm_dp_mode.drm_mode.clock) {
1506 		DRM_ERROR("invalid params\n");
1507 		return;
1508 	}
1509 
1510 	if (dp->is_edp)
1511 		msm_dp_hpd_plug_handle(msm_dp_display, 0);
1512 
1513 	mutex_lock(&msm_dp_display->event_mutex);
1514 	if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
1515 		DRM_ERROR("failed to pm_runtime_resume\n");
1516 		mutex_unlock(&msm_dp_display->event_mutex);
1517 		return;
1518 	}
1519 
1520 	state = msm_dp_display->hpd_state;
1521 	if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
1522 		mutex_unlock(&msm_dp_display->event_mutex);
1523 		return;
1524 	}
1525 
1526 	rc = msm_dp_display_set_mode(dp, &msm_dp_display->msm_dp_mode);
1527 	if (rc) {
1528 		DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
1529 		mutex_unlock(&msm_dp_display->event_mutex);
1530 		return;
1531 	}
1532 
1533 	state =  msm_dp_display->hpd_state;
1534 
1535 	if (state == ST_DISPLAY_OFF) {
1536 		msm_dp_display_host_phy_init(msm_dp_display);
1537 		force_link_train = true;
1538 	}
1539 
1540 	msm_dp_display_enable(msm_dp_display, force_link_train);
1541 
1542 	rc = msm_dp_display_post_enable(dp);
1543 	if (rc) {
1544 		DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
1545 		msm_dp_display_disable(msm_dp_display);
1546 	}
1547 
1548 	/* completed connection */
1549 	msm_dp_display->hpd_state = ST_CONNECTED;
1550 
1551 	drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1552 	mutex_unlock(&msm_dp_display->event_mutex);
1553 }
1554 
msm_dp_bridge_atomic_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1555 void msm_dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
1556 			      struct drm_bridge_state *old_bridge_state)
1557 {
1558 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(drm_bridge);
1559 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;
1560 	struct msm_dp_display_private *msm_dp_display;
1561 
1562 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
1563 
1564 	msm_dp_ctrl_push_idle(msm_dp_display->ctrl);
1565 }
1566 
msm_dp_bridge_atomic_post_disable(struct drm_bridge * drm_bridge,struct drm_bridge_state * old_bridge_state)1567 void msm_dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
1568 				   struct drm_bridge_state *old_bridge_state)
1569 {
1570 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(drm_bridge);
1571 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;
1572 	u32 state;
1573 	struct msm_dp_display_private *msm_dp_display;
1574 
1575 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
1576 
1577 	if (dp->is_edp)
1578 		msm_dp_hpd_unplug_handle(msm_dp_display, 0);
1579 
1580 	mutex_lock(&msm_dp_display->event_mutex);
1581 
1582 	state = msm_dp_display->hpd_state;
1583 	if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
1584 		drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
1585 			   dp->connector_type, state);
1586 
1587 	msm_dp_display_disable(msm_dp_display);
1588 
1589 	state =  msm_dp_display->hpd_state;
1590 	if (state == ST_DISCONNECT_PENDING) {
1591 		/* completed disconnection */
1592 		msm_dp_display->hpd_state = ST_DISCONNECTED;
1593 	} else {
1594 		msm_dp_display->hpd_state = ST_DISPLAY_OFF;
1595 	}
1596 
1597 	drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
1598 
1599 	pm_runtime_put_sync(&dp->pdev->dev);
1600 	mutex_unlock(&msm_dp_display->event_mutex);
1601 }
1602 
msm_dp_bridge_mode_set(struct drm_bridge * drm_bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)1603 void msm_dp_bridge_mode_set(struct drm_bridge *drm_bridge,
1604 			const struct drm_display_mode *mode,
1605 			const struct drm_display_mode *adjusted_mode)
1606 {
1607 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(drm_bridge);
1608 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;
1609 	struct msm_dp_display_private *msm_dp_display;
1610 	struct msm_dp_panel *msm_dp_panel;
1611 
1612 	msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
1613 	msm_dp_panel = msm_dp_display->panel;
1614 
1615 	memset(&msm_dp_display->msm_dp_mode, 0x0, sizeof(struct msm_dp_display_mode));
1616 
1617 	if (msm_dp_display_check_video_test(dp))
1618 		msm_dp_display->msm_dp_mode.bpp = msm_dp_display_get_test_bpp(dp);
1619 	else /* Default num_components per pixel = 3 */
1620 		msm_dp_display->msm_dp_mode.bpp = dp->connector->display_info.bpc * 3;
1621 
1622 	if (!msm_dp_display->msm_dp_mode.bpp)
1623 		msm_dp_display->msm_dp_mode.bpp = 24; /* Default bpp */
1624 
1625 	drm_mode_copy(&msm_dp_display->msm_dp_mode.drm_mode, adjusted_mode);
1626 
1627 	msm_dp_display->msm_dp_mode.v_active_low =
1628 		!!(msm_dp_display->msm_dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
1629 
1630 	msm_dp_display->msm_dp_mode.h_active_low =
1631 		!!(msm_dp_display->msm_dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
1632 
1633 	msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 =
1634 		drm_mode_is_420_only(&dp->connector->display_info, adjusted_mode) &&
1635 		msm_dp_panel->vsc_sdp_supported;
1636 
1637 	/* populate wide_bus_support to different layers */
1638 	msm_dp_display->ctrl->wide_bus_en =
1639 		msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 ? false : msm_dp_display->wide_bus_supported;
1640 	msm_dp_display->catalog->wide_bus_en =
1641 		msm_dp_display->msm_dp_mode.out_fmt_is_yuv_420 ? false : msm_dp_display->wide_bus_supported;
1642 }
1643 
msm_dp_bridge_hpd_enable(struct drm_bridge * bridge)1644 void msm_dp_bridge_hpd_enable(struct drm_bridge *bridge)
1645 {
1646 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(bridge);
1647 	struct msm_dp *msm_dp_display = msm_dp_bridge->msm_dp_display;
1648 	struct msm_dp_display_private *dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1649 
1650 	/*
1651 	 * this is for external DP with hpd irq enabled case,
1652 	 * step-1: msm_dp_pm_runtime_resume() enable dp host only
1653 	 * step-2: enable hdp block and have hpd irq enabled here
1654 	 * step-3: waiting for plugin irq while phy is not initialized
1655 	 * step-4: DP PHY is initialized at plugin handler before link training
1656 	 *
1657 	 */
1658 	mutex_lock(&dp->event_mutex);
1659 	if (pm_runtime_resume_and_get(&msm_dp_display->pdev->dev)) {
1660 		DRM_ERROR("failed to resume power\n");
1661 		mutex_unlock(&dp->event_mutex);
1662 		return;
1663 	}
1664 
1665 	msm_dp_catalog_ctrl_hpd_enable(dp->catalog);
1666 
1667 	/* enable HDP interrupts */
1668 	msm_dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
1669 
1670 	msm_dp_display->internal_hpd = true;
1671 	mutex_unlock(&dp->event_mutex);
1672 }
1673 
msm_dp_bridge_hpd_disable(struct drm_bridge * bridge)1674 void msm_dp_bridge_hpd_disable(struct drm_bridge *bridge)
1675 {
1676 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(bridge);
1677 	struct msm_dp *msm_dp_display = msm_dp_bridge->msm_dp_display;
1678 	struct msm_dp_display_private *dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1679 
1680 	mutex_lock(&dp->event_mutex);
1681 	/* disable HDP interrupts */
1682 	msm_dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
1683 	msm_dp_catalog_ctrl_hpd_disable(dp->catalog);
1684 
1685 	msm_dp_display->internal_hpd = false;
1686 
1687 	pm_runtime_put_sync(&msm_dp_display->pdev->dev);
1688 	mutex_unlock(&dp->event_mutex);
1689 }
1690 
msm_dp_bridge_hpd_notify(struct drm_bridge * bridge,enum drm_connector_status status)1691 void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
1692 			  enum drm_connector_status status)
1693 {
1694 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(bridge);
1695 	struct msm_dp *msm_dp_display = msm_dp_bridge->msm_dp_display;
1696 	struct msm_dp_display_private *dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
1697 
1698 	/* Without next_bridge interrupts are handled by the DP core directly */
1699 	if (msm_dp_display->internal_hpd)
1700 		return;
1701 
1702 	if (!msm_dp_display->link_ready && status == connector_status_connected)
1703 		msm_dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
1704 	else if (msm_dp_display->link_ready && status == connector_status_disconnected)
1705 		msm_dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
1706 }
1707