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