1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4  * Author: Chris Zhong <zyw@rock-chips.com>
5  */
6 
7 #include <linux/clk.h>
8 #include <linux/component.h>
9 #include <linux/extcon.h>
10 #include <linux/firmware.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/phy/phy.h>
13 #include <linux/regmap.h>
14 #include <linux/reset.h>
15 
16 #include <sound/hdmi-codec.h>
17 
18 #include <drm/display/drm_dp_helper.h>
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_edid.h>
21 #include <drm/drm_of.h>
22 #include <drm/drm_probe_helper.h>
23 #include <drm/drm_simple_kms_helper.h>
24 
25 #include "cdn-dp-core.h"
26 #include "cdn-dp-reg.h"
27 #include "rockchip_drm_vop.h"
28 
29 static inline struct cdn_dp_device *connector_to_dp(struct drm_connector *connector)
30 {
31 	return container_of(connector, struct cdn_dp_device, connector);
32 }
33 
34 static inline struct cdn_dp_device *encoder_to_dp(struct drm_encoder *encoder)
35 {
36 	struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);
37 
38 	return container_of(rkencoder, struct cdn_dp_device, encoder);
39 }
40 
41 #define GRF_SOC_CON9		0x6224
42 #define DP_SEL_VOP_LIT		BIT(12)
43 #define GRF_SOC_CON26		0x6268
44 #define DPTX_HPD_SEL		(3 << 12)
45 #define DPTX_HPD_DEL		(2 << 12)
46 #define DPTX_HPD_SEL_MASK	(3 << 28)
47 
48 #define CDN_FW_TIMEOUT_MS	(64 * 1000)
49 #define CDN_DPCD_TIMEOUT_MS	5000
50 #define CDN_DP_FIRMWARE		"rockchip/dptx.bin"
51 MODULE_FIRMWARE(CDN_DP_FIRMWARE);
52 
53 struct cdn_dp_data {
54 	u8 max_phy;
55 };
56 
57 static struct cdn_dp_data rk3399_cdn_dp = {
58 	.max_phy = 2,
59 };
60 
61 static const struct of_device_id cdn_dp_dt_ids[] = {
62 	{ .compatible = "rockchip,rk3399-cdn-dp",
63 		.data = (void *)&rk3399_cdn_dp },
64 	{}
65 };
66 
67 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
68 
69 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
70 			    unsigned int reg, unsigned int val)
71 {
72 	int ret;
73 
74 	ret = clk_prepare_enable(dp->grf_clk);
75 	if (ret) {
76 		DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
77 		return ret;
78 	}
79 
80 	ret = regmap_write(dp->grf, reg, val);
81 	if (ret) {
82 		DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
83 		clk_disable_unprepare(dp->grf_clk);
84 		return ret;
85 	}
86 
87 	clk_disable_unprepare(dp->grf_clk);
88 
89 	return 0;
90 }
91 
92 static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
93 {
94 	int ret;
95 	unsigned long rate;
96 
97 	ret = clk_prepare_enable(dp->pclk);
98 	if (ret < 0) {
99 		DRM_DEV_ERROR(dp->dev, "cannot enable dp pclk %d\n", ret);
100 		goto err_pclk;
101 	}
102 
103 	ret = clk_prepare_enable(dp->core_clk);
104 	if (ret < 0) {
105 		DRM_DEV_ERROR(dp->dev, "cannot enable core_clk %d\n", ret);
106 		goto err_core_clk;
107 	}
108 
109 	ret = pm_runtime_get_sync(dp->dev);
110 	if (ret < 0) {
111 		DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
112 		goto err_pm_runtime_get;
113 	}
114 
115 	reset_control_assert(dp->core_rst);
116 	reset_control_assert(dp->dptx_rst);
117 	reset_control_assert(dp->apb_rst);
118 	reset_control_deassert(dp->core_rst);
119 	reset_control_deassert(dp->dptx_rst);
120 	reset_control_deassert(dp->apb_rst);
121 
122 	rate = clk_get_rate(dp->core_clk);
123 	if (!rate) {
124 		DRM_DEV_ERROR(dp->dev, "get clk rate failed\n");
125 		ret = -EINVAL;
126 		goto err_set_rate;
127 	}
128 
129 	cdn_dp_set_fw_clk(dp, rate);
130 	cdn_dp_clock_reset(dp);
131 
132 	return 0;
133 
134 err_set_rate:
135 	pm_runtime_put(dp->dev);
136 err_pm_runtime_get:
137 	clk_disable_unprepare(dp->core_clk);
138 err_core_clk:
139 	clk_disable_unprepare(dp->pclk);
140 err_pclk:
141 	return ret;
142 }
143 
144 static void cdn_dp_clk_disable(struct cdn_dp_device *dp)
145 {
146 	pm_runtime_put_sync(dp->dev);
147 	clk_disable_unprepare(dp->pclk);
148 	clk_disable_unprepare(dp->core_clk);
149 }
150 
151 static int cdn_dp_get_port_lanes(struct cdn_dp_port *port)
152 {
153 	struct extcon_dev *edev = port->extcon;
154 	union extcon_property_value property;
155 	int dptx;
156 	u8 lanes;
157 
158 	dptx = extcon_get_state(edev, EXTCON_DISP_DP);
159 	if (dptx > 0) {
160 		extcon_get_property(edev, EXTCON_DISP_DP,
161 				    EXTCON_PROP_USB_SS, &property);
162 		if (property.intval)
163 			lanes = 2;
164 		else
165 			lanes = 4;
166 	} else {
167 		lanes = 0;
168 	}
169 
170 	return lanes;
171 }
172 
173 static int cdn_dp_get_sink_count(struct cdn_dp_device *dp, u8 *sink_count)
174 {
175 	int ret;
176 	u8 value;
177 
178 	*sink_count = 0;
179 	ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &value, 1);
180 	if (ret)
181 		return ret;
182 
183 	*sink_count = DP_GET_SINK_COUNT(value);
184 	return 0;
185 }
186 
187 static struct cdn_dp_port *cdn_dp_connected_port(struct cdn_dp_device *dp)
188 {
189 	struct cdn_dp_port *port;
190 	int i, lanes;
191 
192 	for (i = 0; i < dp->ports; i++) {
193 		port = dp->port[i];
194 		lanes = cdn_dp_get_port_lanes(port);
195 		if (lanes)
196 			return port;
197 	}
198 	return NULL;
199 }
200 
201 static bool cdn_dp_check_sink_connection(struct cdn_dp_device *dp)
202 {
203 	unsigned long timeout = jiffies + msecs_to_jiffies(CDN_DPCD_TIMEOUT_MS);
204 	struct cdn_dp_port *port;
205 	u8 sink_count = 0;
206 
207 	if (dp->active_port < 0 || dp->active_port >= dp->ports) {
208 		DRM_DEV_ERROR(dp->dev, "active_port is wrong!\n");
209 		return false;
210 	}
211 
212 	port = dp->port[dp->active_port];
213 
214 	/*
215 	 * Attempt to read sink count, retry in case the sink may not be ready.
216 	 *
217 	 * Sinks are *supposed* to come up within 1ms from an off state, but
218 	 * some docks need more time to power up.
219 	 */
220 	while (time_before(jiffies, timeout)) {
221 		if (!extcon_get_state(port->extcon, EXTCON_DISP_DP))
222 			return false;
223 
224 		if (!cdn_dp_get_sink_count(dp, &sink_count))
225 			return sink_count ? true : false;
226 
227 		usleep_range(5000, 10000);
228 	}
229 
230 	DRM_DEV_ERROR(dp->dev, "Get sink capability timed out\n");
231 	return false;
232 }
233 
234 static enum drm_connector_status
235 cdn_dp_connector_detect(struct drm_connector *connector, bool force)
236 {
237 	struct cdn_dp_device *dp = connector_to_dp(connector);
238 	enum drm_connector_status status = connector_status_disconnected;
239 
240 	mutex_lock(&dp->lock);
241 	if (dp->connected)
242 		status = connector_status_connected;
243 	mutex_unlock(&dp->lock);
244 
245 	return status;
246 }
247 
248 static void cdn_dp_connector_destroy(struct drm_connector *connector)
249 {
250 	drm_connector_unregister(connector);
251 	drm_connector_cleanup(connector);
252 }
253 
254 static const struct drm_connector_funcs cdn_dp_atomic_connector_funcs = {
255 	.detect = cdn_dp_connector_detect,
256 	.destroy = cdn_dp_connector_destroy,
257 	.fill_modes = drm_helper_probe_single_connector_modes,
258 	.reset = drm_atomic_helper_connector_reset,
259 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
260 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
261 };
262 
263 static int cdn_dp_connector_get_modes(struct drm_connector *connector)
264 {
265 	struct cdn_dp_device *dp = connector_to_dp(connector);
266 	struct edid *edid;
267 	int ret = 0;
268 
269 	mutex_lock(&dp->lock);
270 	edid = dp->edid;
271 	if (edid) {
272 		DRM_DEV_DEBUG_KMS(dp->dev, "got edid: width[%d] x height[%d]\n",
273 				  edid->width_cm, edid->height_cm);
274 
275 		dp->sink_has_audio = drm_detect_monitor_audio(edid);
276 
277 		drm_connector_update_edid_property(connector, edid);
278 		ret = drm_add_edid_modes(connector, edid);
279 	}
280 	mutex_unlock(&dp->lock);
281 
282 	return ret;
283 }
284 
285 static enum drm_mode_status
286 cdn_dp_connector_mode_valid(struct drm_connector *connector,
287 			    struct drm_display_mode *mode)
288 {
289 	struct cdn_dp_device *dp = connector_to_dp(connector);
290 	struct drm_display_info *display_info = &dp->connector.display_info;
291 	u32 requested, actual, rate, sink_max, source_max = 0;
292 	u8 lanes, bpc;
293 
294 	/* If DP is disconnected, every mode is invalid */
295 	if (!dp->connected)
296 		return MODE_BAD;
297 
298 	switch (display_info->bpc) {
299 	case 10:
300 		bpc = 10;
301 		break;
302 	case 6:
303 		bpc = 6;
304 		break;
305 	default:
306 		bpc = 8;
307 		break;
308 	}
309 
310 	requested = mode->clock * bpc * 3 / 1000;
311 
312 	source_max = dp->lanes;
313 	sink_max = drm_dp_max_lane_count(dp->dpcd);
314 	lanes = min(source_max, sink_max);
315 
316 	source_max = drm_dp_bw_code_to_link_rate(CDN_DP_MAX_LINK_RATE);
317 	sink_max = drm_dp_max_link_rate(dp->dpcd);
318 	rate = min(source_max, sink_max);
319 
320 	actual = rate * lanes / 100;
321 
322 	/* efficiency is about 0.8 */
323 	actual = actual * 8 / 10;
324 
325 	if (requested > actual) {
326 		DRM_DEV_DEBUG_KMS(dp->dev,
327 				  "requested=%d, actual=%d, clock=%d\n",
328 				  requested, actual, mode->clock);
329 		return MODE_CLOCK_HIGH;
330 	}
331 
332 	return MODE_OK;
333 }
334 
335 static struct drm_connector_helper_funcs cdn_dp_connector_helper_funcs = {
336 	.get_modes = cdn_dp_connector_get_modes,
337 	.mode_valid = cdn_dp_connector_mode_valid,
338 };
339 
340 static int cdn_dp_firmware_init(struct cdn_dp_device *dp)
341 {
342 	int ret;
343 	const u32 *iram_data, *dram_data;
344 	const struct firmware *fw = dp->fw;
345 	const struct cdn_firmware_header *hdr;
346 
347 	hdr = (struct cdn_firmware_header *)fw->data;
348 	if (fw->size != le32_to_cpu(hdr->size_bytes)) {
349 		DRM_DEV_ERROR(dp->dev, "firmware is invalid\n");
350 		return -EINVAL;
351 	}
352 
353 	iram_data = (const u32 *)(fw->data + hdr->header_size);
354 	dram_data = (const u32 *)(fw->data + hdr->header_size + hdr->iram_size);
355 
356 	ret = cdn_dp_load_firmware(dp, iram_data, hdr->iram_size,
357 				   dram_data, hdr->dram_size);
358 	if (ret)
359 		return ret;
360 
361 	ret = cdn_dp_set_firmware_active(dp, true);
362 	if (ret) {
363 		DRM_DEV_ERROR(dp->dev, "active ucpu failed: %d\n", ret);
364 		return ret;
365 	}
366 
367 	return cdn_dp_event_config(dp);
368 }
369 
370 static int cdn_dp_get_sink_capability(struct cdn_dp_device *dp)
371 {
372 	int ret;
373 
374 	if (!cdn_dp_check_sink_connection(dp))
375 		return -ENODEV;
376 
377 	ret = cdn_dp_dpcd_read(dp, DP_DPCD_REV, dp->dpcd,
378 			       DP_RECEIVER_CAP_SIZE);
379 	if (ret) {
380 		DRM_DEV_ERROR(dp->dev, "Failed to get caps %d\n", ret);
381 		return ret;
382 	}
383 
384 	kfree(dp->edid);
385 	dp->edid = drm_do_get_edid(&dp->connector,
386 				   cdn_dp_get_edid_block, dp);
387 	return 0;
388 }
389 
390 static int cdn_dp_enable_phy(struct cdn_dp_device *dp, struct cdn_dp_port *port)
391 {
392 	union extcon_property_value property;
393 	int ret;
394 
395 	if (!port->phy_enabled) {
396 		ret = phy_power_on(port->phy);
397 		if (ret) {
398 			DRM_DEV_ERROR(dp->dev, "phy power on failed: %d\n",
399 				      ret);
400 			goto err_phy;
401 		}
402 		port->phy_enabled = true;
403 	}
404 
405 	ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
406 			       DPTX_HPD_SEL_MASK | DPTX_HPD_SEL);
407 	if (ret) {
408 		DRM_DEV_ERROR(dp->dev, "Failed to write HPD_SEL %d\n", ret);
409 		goto err_power_on;
410 	}
411 
412 	ret = cdn_dp_get_hpd_status(dp);
413 	if (ret <= 0) {
414 		if (!ret)
415 			DRM_DEV_ERROR(dp->dev, "hpd does not exist\n");
416 		goto err_power_on;
417 	}
418 
419 	ret = extcon_get_property(port->extcon, EXTCON_DISP_DP,
420 				  EXTCON_PROP_USB_TYPEC_POLARITY, &property);
421 	if (ret) {
422 		DRM_DEV_ERROR(dp->dev, "get property failed\n");
423 		goto err_power_on;
424 	}
425 
426 	port->lanes = cdn_dp_get_port_lanes(port);
427 	ret = cdn_dp_set_host_cap(dp, port->lanes, property.intval);
428 	if (ret) {
429 		DRM_DEV_ERROR(dp->dev, "set host capabilities failed: %d\n",
430 			      ret);
431 		goto err_power_on;
432 	}
433 
434 	dp->active_port = port->id;
435 	return 0;
436 
437 err_power_on:
438 	if (phy_power_off(port->phy))
439 		DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
440 	else
441 		port->phy_enabled = false;
442 
443 err_phy:
444 	cdn_dp_grf_write(dp, GRF_SOC_CON26,
445 			 DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
446 	return ret;
447 }
448 
449 static int cdn_dp_disable_phy(struct cdn_dp_device *dp,
450 			      struct cdn_dp_port *port)
451 {
452 	int ret;
453 
454 	if (port->phy_enabled) {
455 		ret = phy_power_off(port->phy);
456 		if (ret) {
457 			DRM_DEV_ERROR(dp->dev, "phy power off failed: %d", ret);
458 			return ret;
459 		}
460 	}
461 
462 	port->phy_enabled = false;
463 	port->lanes = 0;
464 	dp->active_port = -1;
465 	return 0;
466 }
467 
468 static int cdn_dp_disable(struct cdn_dp_device *dp)
469 {
470 	int ret, i;
471 
472 	if (!dp->active)
473 		return 0;
474 
475 	for (i = 0; i < dp->ports; i++)
476 		cdn_dp_disable_phy(dp, dp->port[i]);
477 
478 	ret = cdn_dp_grf_write(dp, GRF_SOC_CON26,
479 			       DPTX_HPD_SEL_MASK | DPTX_HPD_DEL);
480 	if (ret) {
481 		DRM_DEV_ERROR(dp->dev, "Failed to clear hpd sel %d\n",
482 			      ret);
483 		return ret;
484 	}
485 
486 	cdn_dp_set_firmware_active(dp, false);
487 	cdn_dp_clk_disable(dp);
488 	dp->active = false;
489 	dp->max_lanes = 0;
490 	dp->max_rate = 0;
491 	if (!dp->connected) {
492 		kfree(dp->edid);
493 		dp->edid = NULL;
494 	}
495 
496 	return 0;
497 }
498 
499 static int cdn_dp_enable(struct cdn_dp_device *dp)
500 {
501 	int ret, i, lanes;
502 	struct cdn_dp_port *port;
503 
504 	port = cdn_dp_connected_port(dp);
505 	if (!port) {
506 		DRM_DEV_ERROR(dp->dev,
507 			      "Can't enable without connection\n");
508 		return -ENODEV;
509 	}
510 
511 	if (dp->active)
512 		return 0;
513 
514 	ret = cdn_dp_clk_enable(dp);
515 	if (ret)
516 		return ret;
517 
518 	ret = cdn_dp_firmware_init(dp);
519 	if (ret) {
520 		DRM_DEV_ERROR(dp->dev, "firmware init failed: %d", ret);
521 		goto err_clk_disable;
522 	}
523 
524 	/* only enable the port that connected with downstream device */
525 	for (i = port->id; i < dp->ports; i++) {
526 		port = dp->port[i];
527 		lanes = cdn_dp_get_port_lanes(port);
528 		if (lanes) {
529 			ret = cdn_dp_enable_phy(dp, port);
530 			if (ret)
531 				continue;
532 
533 			ret = cdn_dp_get_sink_capability(dp);
534 			if (ret) {
535 				cdn_dp_disable_phy(dp, port);
536 			} else {
537 				dp->active = true;
538 				dp->lanes = port->lanes;
539 				return 0;
540 			}
541 		}
542 	}
543 
544 err_clk_disable:
545 	cdn_dp_clk_disable(dp);
546 	return ret;
547 }
548 
549 static void cdn_dp_encoder_mode_set(struct drm_encoder *encoder,
550 				    struct drm_display_mode *mode,
551 				    struct drm_display_mode *adjusted)
552 {
553 	struct cdn_dp_device *dp = encoder_to_dp(encoder);
554 	struct drm_display_info *display_info = &dp->connector.display_info;
555 	struct video_info *video = &dp->video_info;
556 
557 	switch (display_info->bpc) {
558 	case 10:
559 		video->color_depth = 10;
560 		break;
561 	case 6:
562 		video->color_depth = 6;
563 		break;
564 	default:
565 		video->color_depth = 8;
566 		break;
567 	}
568 
569 	video->color_fmt = PXL_RGB;
570 	video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
571 	video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
572 
573 	drm_mode_copy(&dp->mode, adjusted);
574 }
575 
576 static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
577 {
578 	u8 link_status[DP_LINK_STATUS_SIZE];
579 	struct cdn_dp_port *port = cdn_dp_connected_port(dp);
580 	u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
581 
582 	if (!port || !dp->max_rate || !dp->max_lanes)
583 		return false;
584 
585 	if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
586 			     DP_LINK_STATUS_SIZE)) {
587 		DRM_ERROR("Failed to get link status\n");
588 		return false;
589 	}
590 
591 	/* if link training is requested we should perform it always */
592 	return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
593 }
594 
595 static void cdn_dp_audio_handle_plugged_change(struct cdn_dp_device *dp,
596 					       bool plugged)
597 {
598 	if (dp->codec_dev)
599 		dp->plugged_cb(dp->codec_dev, plugged);
600 }
601 
602 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
603 {
604 	struct cdn_dp_device *dp = encoder_to_dp(encoder);
605 	int ret, val;
606 
607 	ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
608 	if (ret < 0) {
609 		DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
610 		return;
611 	}
612 
613 	DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
614 			  (ret) ? "LIT" : "BIG");
615 	if (ret)
616 		val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
617 	else
618 		val = DP_SEL_VOP_LIT << 16;
619 
620 	ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
621 	if (ret)
622 		return;
623 
624 	mutex_lock(&dp->lock);
625 
626 	ret = cdn_dp_enable(dp);
627 	if (ret) {
628 		DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
629 			      ret);
630 		goto out;
631 	}
632 	if (!cdn_dp_check_link_status(dp)) {
633 		ret = cdn_dp_train_link(dp);
634 		if (ret) {
635 			DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
636 			goto out;
637 		}
638 	}
639 
640 	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
641 	if (ret) {
642 		DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
643 		goto out;
644 	}
645 
646 	ret = cdn_dp_config_video(dp);
647 	if (ret) {
648 		DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
649 		goto out;
650 	}
651 
652 	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
653 	if (ret) {
654 		DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
655 		goto out;
656 	}
657 
658 	cdn_dp_audio_handle_plugged_change(dp, true);
659 
660 out:
661 	mutex_unlock(&dp->lock);
662 }
663 
664 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
665 {
666 	struct cdn_dp_device *dp = encoder_to_dp(encoder);
667 	int ret;
668 
669 	mutex_lock(&dp->lock);
670 	cdn_dp_audio_handle_plugged_change(dp, false);
671 
672 	if (dp->active) {
673 		ret = cdn_dp_disable(dp);
674 		if (ret) {
675 			DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
676 				      ret);
677 		}
678 	}
679 	mutex_unlock(&dp->lock);
680 
681 	/*
682 	 * In the following 2 cases, we need to run the event_work to re-enable
683 	 * the DP:
684 	 * 1. If there is not just one port device is connected, and remove one
685 	 *    device from a port, the DP will be disabled here, at this case,
686 	 *    run the event_work to re-open DP for the other port.
687 	 * 2. If re-training or re-config failed, the DP will be disabled here.
688 	 *    run the event_work to re-connect it.
689 	 */
690 	if (!dp->connected && cdn_dp_connected_port(dp))
691 		schedule_work(&dp->event_work);
692 }
693 
694 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
695 				       struct drm_crtc_state *crtc_state,
696 				       struct drm_connector_state *conn_state)
697 {
698 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
699 
700 	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
701 	s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
702 
703 	return 0;
704 }
705 
706 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
707 	.mode_set = cdn_dp_encoder_mode_set,
708 	.enable = cdn_dp_encoder_enable,
709 	.disable = cdn_dp_encoder_disable,
710 	.atomic_check = cdn_dp_encoder_atomic_check,
711 };
712 
713 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
714 {
715 	struct device *dev = dp->dev;
716 	struct device_node *np = dev->of_node;
717 	struct platform_device *pdev = to_platform_device(dev);
718 
719 	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
720 	if (IS_ERR(dp->grf)) {
721 		DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
722 		return PTR_ERR(dp->grf);
723 	}
724 
725 	dp->regs = devm_platform_ioremap_resource(pdev, 0);
726 	if (IS_ERR(dp->regs)) {
727 		DRM_DEV_ERROR(dev, "ioremap reg failed\n");
728 		return PTR_ERR(dp->regs);
729 	}
730 
731 	dp->core_clk = devm_clk_get(dev, "core-clk");
732 	if (IS_ERR(dp->core_clk)) {
733 		DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
734 		return PTR_ERR(dp->core_clk);
735 	}
736 
737 	dp->pclk = devm_clk_get(dev, "pclk");
738 	if (IS_ERR(dp->pclk)) {
739 		DRM_DEV_ERROR(dev, "cannot get pclk\n");
740 		return PTR_ERR(dp->pclk);
741 	}
742 
743 	dp->spdif_clk = devm_clk_get(dev, "spdif");
744 	if (IS_ERR(dp->spdif_clk)) {
745 		DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
746 		return PTR_ERR(dp->spdif_clk);
747 	}
748 
749 	dp->grf_clk = devm_clk_get(dev, "grf");
750 	if (IS_ERR(dp->grf_clk)) {
751 		DRM_DEV_ERROR(dev, "cannot get grf clk\n");
752 		return PTR_ERR(dp->grf_clk);
753 	}
754 
755 	dp->spdif_rst = devm_reset_control_get(dev, "spdif");
756 	if (IS_ERR(dp->spdif_rst)) {
757 		DRM_DEV_ERROR(dev, "no spdif reset control found\n");
758 		return PTR_ERR(dp->spdif_rst);
759 	}
760 
761 	dp->dptx_rst = devm_reset_control_get(dev, "dptx");
762 	if (IS_ERR(dp->dptx_rst)) {
763 		DRM_DEV_ERROR(dev, "no uphy reset control found\n");
764 		return PTR_ERR(dp->dptx_rst);
765 	}
766 
767 	dp->core_rst = devm_reset_control_get(dev, "core");
768 	if (IS_ERR(dp->core_rst)) {
769 		DRM_DEV_ERROR(dev, "no core reset control found\n");
770 		return PTR_ERR(dp->core_rst);
771 	}
772 
773 	dp->apb_rst = devm_reset_control_get(dev, "apb");
774 	if (IS_ERR(dp->apb_rst)) {
775 		DRM_DEV_ERROR(dev, "no apb reset control found\n");
776 		return PTR_ERR(dp->apb_rst);
777 	}
778 
779 	return 0;
780 }
781 
782 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
783 				  struct hdmi_codec_daifmt *daifmt,
784 				  struct hdmi_codec_params *params)
785 {
786 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
787 	struct audio_info audio = {
788 		.sample_width = params->sample_width,
789 		.sample_rate = params->sample_rate,
790 		.channels = params->channels,
791 	};
792 	int ret;
793 
794 	mutex_lock(&dp->lock);
795 	if (!dp->active) {
796 		ret = -ENODEV;
797 		goto out;
798 	}
799 
800 	switch (daifmt->fmt) {
801 	case HDMI_I2S:
802 		audio.format = AFMT_I2S;
803 		break;
804 	case HDMI_SPDIF:
805 		audio.format = AFMT_SPDIF;
806 		break;
807 	default:
808 		DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
809 		ret = -EINVAL;
810 		goto out;
811 	}
812 
813 	ret = cdn_dp_audio_config(dp, &audio);
814 	if (!ret)
815 		dp->audio_info = audio;
816 
817 out:
818 	mutex_unlock(&dp->lock);
819 	return ret;
820 }
821 
822 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
823 {
824 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
825 	int ret;
826 
827 	mutex_lock(&dp->lock);
828 	if (!dp->active)
829 		goto out;
830 
831 	ret = cdn_dp_audio_stop(dp, &dp->audio_info);
832 	if (!ret)
833 		dp->audio_info.format = AFMT_UNUSED;
834 out:
835 	mutex_unlock(&dp->lock);
836 }
837 
838 static int cdn_dp_audio_mute_stream(struct device *dev, void *data,
839 				    bool enable, int direction)
840 {
841 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
842 	int ret;
843 
844 	mutex_lock(&dp->lock);
845 	if (!dp->active) {
846 		ret = -ENODEV;
847 		goto out;
848 	}
849 
850 	ret = cdn_dp_audio_mute(dp, enable);
851 
852 out:
853 	mutex_unlock(&dp->lock);
854 	return ret;
855 }
856 
857 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
858 				u8 *buf, size_t len)
859 {
860 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
861 
862 	memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
863 
864 	return 0;
865 }
866 
867 static int cdn_dp_audio_hook_plugged_cb(struct device *dev, void *data,
868 					hdmi_codec_plugged_cb fn,
869 					struct device *codec_dev)
870 {
871 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
872 
873 	mutex_lock(&dp->lock);
874 	dp->plugged_cb = fn;
875 	dp->codec_dev = codec_dev;
876 	cdn_dp_audio_handle_plugged_change(dp, dp->connected);
877 	mutex_unlock(&dp->lock);
878 
879 	return 0;
880 }
881 
882 static const struct hdmi_codec_ops audio_codec_ops = {
883 	.hw_params = cdn_dp_audio_hw_params,
884 	.audio_shutdown = cdn_dp_audio_shutdown,
885 	.mute_stream = cdn_dp_audio_mute_stream,
886 	.get_eld = cdn_dp_audio_get_eld,
887 	.hook_plugged_cb = cdn_dp_audio_hook_plugged_cb,
888 	.no_capture_mute = 1,
889 };
890 
891 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
892 				   struct device *dev)
893 {
894 	struct hdmi_codec_pdata codec_data = {
895 		.i2s = 1,
896 		.spdif = 1,
897 		.ops = &audio_codec_ops,
898 		.max_i2s_channels = 8,
899 	};
900 
901 	dp->audio_pdev = platform_device_register_data(
902 			 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
903 			 &codec_data, sizeof(codec_data));
904 
905 	return PTR_ERR_OR_ZERO(dp->audio_pdev);
906 }
907 
908 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
909 {
910 	int ret;
911 	unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
912 	unsigned long sleep = 1000;
913 
914 	WARN_ON(!mutex_is_locked(&dp->lock));
915 
916 	if (dp->fw_loaded)
917 		return 0;
918 
919 	/* Drop the lock before getting the firmware to avoid blocking boot */
920 	mutex_unlock(&dp->lock);
921 
922 	while (time_before(jiffies, timeout)) {
923 		ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
924 		if (ret == -ENOENT) {
925 			msleep(sleep);
926 			sleep *= 2;
927 			continue;
928 		} else if (ret) {
929 			DRM_DEV_ERROR(dp->dev,
930 				      "failed to request firmware: %d\n", ret);
931 			goto out;
932 		}
933 
934 		dp->fw_loaded = true;
935 		ret = 0;
936 		goto out;
937 	}
938 
939 	DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
940 	ret = -ETIMEDOUT;
941 out:
942 	mutex_lock(&dp->lock);
943 	return ret;
944 }
945 
946 static void cdn_dp_pd_event_work(struct work_struct *work)
947 {
948 	struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
949 						event_work);
950 	struct drm_connector *connector = &dp->connector;
951 	enum drm_connector_status old_status;
952 
953 	int ret;
954 
955 	mutex_lock(&dp->lock);
956 
957 	if (dp->suspended)
958 		goto out;
959 
960 	ret = cdn_dp_request_firmware(dp);
961 	if (ret)
962 		goto out;
963 
964 	dp->connected = true;
965 
966 	/* Not connected, notify userspace to disable the block */
967 	if (!cdn_dp_connected_port(dp)) {
968 		DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
969 		dp->connected = false;
970 
971 	/* Connected but not enabled, enable the block */
972 	} else if (!dp->active) {
973 		DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
974 		ret = cdn_dp_enable(dp);
975 		if (ret) {
976 			DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
977 			dp->connected = false;
978 		}
979 
980 	/* Enabled and connected to a dongle without a sink, notify userspace */
981 	} else if (!cdn_dp_check_sink_connection(dp)) {
982 		DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
983 		dp->connected = false;
984 
985 	/* Enabled and connected with a sink, re-train if requested */
986 	} else if (!cdn_dp_check_link_status(dp)) {
987 		unsigned int rate = dp->max_rate;
988 		unsigned int lanes = dp->max_lanes;
989 		struct drm_display_mode *mode = &dp->mode;
990 
991 		DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
992 		ret = cdn_dp_train_link(dp);
993 		if (ret) {
994 			dp->connected = false;
995 			DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
996 			goto out;
997 		}
998 
999 		/* If training result is changed, update the video config */
1000 		if (mode->clock &&
1001 		    (rate != dp->max_rate || lanes != dp->max_lanes)) {
1002 			ret = cdn_dp_config_video(dp);
1003 			if (ret) {
1004 				dp->connected = false;
1005 				DRM_DEV_ERROR(dp->dev,
1006 					      "Failed to config video %d\n",
1007 					      ret);
1008 			}
1009 		}
1010 	}
1011 
1012 out:
1013 	mutex_unlock(&dp->lock);
1014 
1015 	old_status = connector->status;
1016 	connector->status = connector->funcs->detect(connector, false);
1017 	if (old_status != connector->status)
1018 		drm_kms_helper_hotplug_event(dp->drm_dev);
1019 }
1020 
1021 static int cdn_dp_pd_event(struct notifier_block *nb,
1022 			   unsigned long event, void *priv)
1023 {
1024 	struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1025 						event_nb);
1026 	struct cdn_dp_device *dp = port->dp;
1027 
1028 	/*
1029 	 * It would be nice to be able to just do the work inline right here.
1030 	 * However, we need to make a bunch of calls that might sleep in order
1031 	 * to turn on the block/phy, so use a worker instead.
1032 	 */
1033 	schedule_work(&dp->event_work);
1034 
1035 	return NOTIFY_DONE;
1036 }
1037 
1038 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1039 {
1040 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1041 	struct drm_encoder *encoder;
1042 	struct drm_connector *connector;
1043 	struct cdn_dp_port *port;
1044 	struct drm_device *drm_dev = data;
1045 	int ret, i;
1046 
1047 	ret = cdn_dp_parse_dt(dp);
1048 	if (ret < 0)
1049 		return ret;
1050 
1051 	dp->drm_dev = drm_dev;
1052 	dp->connected = false;
1053 	dp->active = false;
1054 	dp->active_port = -1;
1055 	dp->fw_loaded = false;
1056 
1057 	INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1058 
1059 	encoder = &dp->encoder.encoder;
1060 
1061 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1062 							     dev->of_node);
1063 	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1064 
1065 	ret = drm_simple_encoder_init(drm_dev, encoder,
1066 				      DRM_MODE_ENCODER_TMDS);
1067 	if (ret) {
1068 		DRM_ERROR("failed to initialize encoder with drm\n");
1069 		return ret;
1070 	}
1071 
1072 	drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1073 
1074 	connector = &dp->connector;
1075 	connector->polled = DRM_CONNECTOR_POLL_HPD;
1076 	connector->dpms = DRM_MODE_DPMS_OFF;
1077 
1078 	ret = drm_connector_init(drm_dev, connector,
1079 				 &cdn_dp_atomic_connector_funcs,
1080 				 DRM_MODE_CONNECTOR_DisplayPort);
1081 	if (ret) {
1082 		DRM_ERROR("failed to initialize connector with drm\n");
1083 		goto err_free_encoder;
1084 	}
1085 
1086 	drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1087 
1088 	ret = drm_connector_attach_encoder(connector, encoder);
1089 	if (ret) {
1090 		DRM_ERROR("failed to attach connector and encoder\n");
1091 		goto err_free_connector;
1092 	}
1093 
1094 	for (i = 0; i < dp->ports; i++) {
1095 		port = dp->port[i];
1096 
1097 		port->event_nb.notifier_call = cdn_dp_pd_event;
1098 		ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1099 						    EXTCON_DISP_DP,
1100 						    &port->event_nb);
1101 		if (ret) {
1102 			DRM_DEV_ERROR(dev,
1103 				      "register EXTCON_DISP_DP notifier err\n");
1104 			goto err_free_connector;
1105 		}
1106 	}
1107 
1108 	pm_runtime_enable(dev);
1109 
1110 	schedule_work(&dp->event_work);
1111 
1112 	return 0;
1113 
1114 err_free_connector:
1115 	drm_connector_cleanup(connector);
1116 err_free_encoder:
1117 	drm_encoder_cleanup(encoder);
1118 	return ret;
1119 }
1120 
1121 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1122 {
1123 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1124 	struct drm_encoder *encoder = &dp->encoder.encoder;
1125 	struct drm_connector *connector = &dp->connector;
1126 
1127 	cancel_work_sync(&dp->event_work);
1128 	cdn_dp_encoder_disable(encoder);
1129 	encoder->funcs->destroy(encoder);
1130 	connector->funcs->destroy(connector);
1131 
1132 	pm_runtime_disable(dev);
1133 	if (dp->fw_loaded)
1134 		release_firmware(dp->fw);
1135 	kfree(dp->edid);
1136 	dp->edid = NULL;
1137 }
1138 
1139 static const struct component_ops cdn_dp_component_ops = {
1140 	.bind = cdn_dp_bind,
1141 	.unbind = cdn_dp_unbind,
1142 };
1143 
1144 static int cdn_dp_suspend(struct device *dev)
1145 {
1146 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1147 	int ret = 0;
1148 
1149 	mutex_lock(&dp->lock);
1150 	if (dp->active)
1151 		ret = cdn_dp_disable(dp);
1152 	dp->suspended = true;
1153 	mutex_unlock(&dp->lock);
1154 
1155 	return ret;
1156 }
1157 
1158 static __maybe_unused int cdn_dp_resume(struct device *dev)
1159 {
1160 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1161 
1162 	mutex_lock(&dp->lock);
1163 	dp->suspended = false;
1164 	if (dp->fw_loaded)
1165 		schedule_work(&dp->event_work);
1166 	mutex_unlock(&dp->lock);
1167 
1168 	return 0;
1169 }
1170 
1171 static int cdn_dp_probe(struct platform_device *pdev)
1172 {
1173 	struct device *dev = &pdev->dev;
1174 	const struct of_device_id *match;
1175 	struct cdn_dp_data *dp_data;
1176 	struct cdn_dp_port *port;
1177 	struct cdn_dp_device *dp;
1178 	struct extcon_dev *extcon;
1179 	struct phy *phy;
1180 	int i;
1181 
1182 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1183 	if (!dp)
1184 		return -ENOMEM;
1185 	dp->dev = dev;
1186 
1187 	match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1188 	dp_data = (struct cdn_dp_data *)match->data;
1189 
1190 	for (i = 0; i < dp_data->max_phy; i++) {
1191 		extcon = extcon_get_edev_by_phandle(dev, i);
1192 		phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1193 
1194 		if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1195 		    PTR_ERR(phy) == -EPROBE_DEFER)
1196 			return -EPROBE_DEFER;
1197 
1198 		if (IS_ERR(extcon) || IS_ERR(phy))
1199 			continue;
1200 
1201 		port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1202 		if (!port)
1203 			return -ENOMEM;
1204 
1205 		port->extcon = extcon;
1206 		port->phy = phy;
1207 		port->dp = dp;
1208 		port->id = i;
1209 		dp->port[dp->ports++] = port;
1210 	}
1211 
1212 	if (!dp->ports) {
1213 		DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1214 		return -EINVAL;
1215 	}
1216 
1217 	mutex_init(&dp->lock);
1218 	dev_set_drvdata(dev, dp);
1219 
1220 	cdn_dp_audio_codec_init(dp, dev);
1221 
1222 	return component_add(dev, &cdn_dp_component_ops);
1223 }
1224 
1225 static int cdn_dp_remove(struct platform_device *pdev)
1226 {
1227 	struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1228 
1229 	platform_device_unregister(dp->audio_pdev);
1230 	cdn_dp_suspend(dp->dev);
1231 	component_del(&pdev->dev, &cdn_dp_component_ops);
1232 
1233 	return 0;
1234 }
1235 
1236 static void cdn_dp_shutdown(struct platform_device *pdev)
1237 {
1238 	struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1239 
1240 	cdn_dp_suspend(dp->dev);
1241 }
1242 
1243 static const struct dev_pm_ops cdn_dp_pm_ops = {
1244 	SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1245 				cdn_dp_resume)
1246 };
1247 
1248 struct platform_driver cdn_dp_driver = {
1249 	.probe = cdn_dp_probe,
1250 	.remove = cdn_dp_remove,
1251 	.shutdown = cdn_dp_shutdown,
1252 	.driver = {
1253 		   .name = "cdn-dp",
1254 		   .owner = THIS_MODULE,
1255 		   .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1256 		   .pm = &cdn_dp_pm_ops,
1257 	},
1258 };
1259