1 /*
2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3  * Author: Chris Zhong <zyw@rock-chips.com>
4  *
5  * This software is licensed under the terms of the GNU General Public
6  * License version 2, as published by the Free Software Foundation, and
7  * may be copied, distributed, and modified under those terms.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14 
15 #include <drm/drmP.h>
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_dp_helper.h>
19 #include <drm/drm_edid.h>
20 #include <drm/drm_of.h>
21 
22 #include <linux/clk.h>
23 #include <linux/component.h>
24 #include <linux/extcon.h>
25 #include <linux/firmware.h>
26 #include <linux/regmap.h>
27 #include <linux/reset.h>
28 #include <linux/mfd/syscon.h>
29 #include <linux/phy/phy.h>
30 
31 #include <sound/hdmi-codec.h>
32 
33 #include "cdn-dp-core.h"
34 #include "cdn-dp-reg.h"
35 #include "rockchip_drm_vop.h"
36 
37 #define connector_to_dp(c) \
38 		container_of(c, struct cdn_dp_device, connector)
39 
40 #define encoder_to_dp(c) \
41 		container_of(c, struct cdn_dp_device, encoder)
42 
43 #define GRF_SOC_CON9		0x6224
44 #define DP_SEL_VOP_LIT		BIT(12)
45 #define GRF_SOC_CON26		0x6268
46 #define DPTX_HPD_SEL		(3 << 12)
47 #define DPTX_HPD_DEL		(2 << 12)
48 #define DPTX_HPD_SEL_MASK	(3 << 28)
49 
50 #define CDN_FW_TIMEOUT_MS	(64 * 1000)
51 #define CDN_DPCD_TIMEOUT_MS	5000
52 #define CDN_DP_FIRMWARE		"rockchip/dptx.bin"
53 
54 struct cdn_dp_data {
55 	u8 max_phy;
56 };
57 
58 struct cdn_dp_data rk3399_cdn_dp = {
59 	.max_phy = 2,
60 };
61 
62 static const struct of_device_id cdn_dp_dt_ids[] = {
63 	{ .compatible = "rockchip,rk3399-cdn-dp",
64 		.data = (void *)&rk3399_cdn_dp },
65 	{}
66 };
67 
68 MODULE_DEVICE_TABLE(of, cdn_dp_dt_ids);
69 
70 static int cdn_dp_grf_write(struct cdn_dp_device *dp,
71 			    unsigned int reg, unsigned int val)
72 {
73 	int ret;
74 
75 	ret = clk_prepare_enable(dp->grf_clk);
76 	if (ret) {
77 		DRM_DEV_ERROR(dp->dev, "Failed to prepare_enable grf clock\n");
78 		return ret;
79 	}
80 
81 	ret = regmap_write(dp->grf, reg, val);
82 	if (ret) {
83 		DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
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 		ret = drm_add_edid_modes(connector, edid);
277 		if (ret)
278 			drm_connector_update_edid_property(connector,
279 								edid);
280 	}
281 	mutex_unlock(&dp->lock);
282 
283 	return ret;
284 }
285 
286 static int 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->link.rate = 0;
490 	dp->link.num_lanes = 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 	memcpy(&dp->mode, adjusted, sizeof(*mode));
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->link.rate || !dp->link.num_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_encoder_enable(struct drm_encoder *encoder)
596 {
597 	struct cdn_dp_device *dp = encoder_to_dp(encoder);
598 	int ret, val;
599 
600 	ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
601 	if (ret < 0) {
602 		DRM_DEV_ERROR(dp->dev, "Could not get vop id, %d", ret);
603 		return;
604 	}
605 
606 	DRM_DEV_DEBUG_KMS(dp->dev, "vop %s output to cdn-dp\n",
607 			  (ret) ? "LIT" : "BIG");
608 	if (ret)
609 		val = DP_SEL_VOP_LIT | (DP_SEL_VOP_LIT << 16);
610 	else
611 		val = DP_SEL_VOP_LIT << 16;
612 
613 	ret = cdn_dp_grf_write(dp, GRF_SOC_CON9, val);
614 	if (ret)
615 		return;
616 
617 	mutex_lock(&dp->lock);
618 
619 	ret = cdn_dp_enable(dp);
620 	if (ret) {
621 		DRM_DEV_ERROR(dp->dev, "Failed to enable encoder %d\n",
622 			      ret);
623 		goto out;
624 	}
625 	if (!cdn_dp_check_link_status(dp)) {
626 		ret = cdn_dp_train_link(dp);
627 		if (ret) {
628 			DRM_DEV_ERROR(dp->dev, "Failed link train %d\n", ret);
629 			goto out;
630 		}
631 	}
632 
633 	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_IDLE);
634 	if (ret) {
635 		DRM_DEV_ERROR(dp->dev, "Failed to idle video %d\n", ret);
636 		goto out;
637 	}
638 
639 	ret = cdn_dp_config_video(dp);
640 	if (ret) {
641 		DRM_DEV_ERROR(dp->dev, "Failed to config video %d\n", ret);
642 		goto out;
643 	}
644 
645 	ret = cdn_dp_set_video_status(dp, CONTROL_VIDEO_VALID);
646 	if (ret) {
647 		DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
648 		goto out;
649 	}
650 out:
651 	mutex_unlock(&dp->lock);
652 }
653 
654 static void cdn_dp_encoder_disable(struct drm_encoder *encoder)
655 {
656 	struct cdn_dp_device *dp = encoder_to_dp(encoder);
657 	int ret;
658 
659 	mutex_lock(&dp->lock);
660 	if (dp->active) {
661 		ret = cdn_dp_disable(dp);
662 		if (ret) {
663 			DRM_DEV_ERROR(dp->dev, "Failed to disable encoder %d\n",
664 				      ret);
665 		}
666 	}
667 	mutex_unlock(&dp->lock);
668 
669 	/*
670 	 * In the following 2 cases, we need to run the event_work to re-enable
671 	 * the DP:
672 	 * 1. If there is not just one port device is connected, and remove one
673 	 *    device from a port, the DP will be disabled here, at this case,
674 	 *    run the event_work to re-open DP for the other port.
675 	 * 2. If re-training or re-config failed, the DP will be disabled here.
676 	 *    run the event_work to re-connect it.
677 	 */
678 	if (!dp->connected && cdn_dp_connected_port(dp))
679 		schedule_work(&dp->event_work);
680 }
681 
682 static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
683 				       struct drm_crtc_state *crtc_state,
684 				       struct drm_connector_state *conn_state)
685 {
686 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
687 
688 	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
689 	s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
690 
691 	return 0;
692 }
693 
694 static const struct drm_encoder_helper_funcs cdn_dp_encoder_helper_funcs = {
695 	.mode_set = cdn_dp_encoder_mode_set,
696 	.enable = cdn_dp_encoder_enable,
697 	.disable = cdn_dp_encoder_disable,
698 	.atomic_check = cdn_dp_encoder_atomic_check,
699 };
700 
701 static const struct drm_encoder_funcs cdn_dp_encoder_funcs = {
702 	.destroy = drm_encoder_cleanup,
703 };
704 
705 static int cdn_dp_parse_dt(struct cdn_dp_device *dp)
706 {
707 	struct device *dev = dp->dev;
708 	struct device_node *np = dev->of_node;
709 	struct platform_device *pdev = to_platform_device(dev);
710 	struct resource *res;
711 
712 	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
713 	if (IS_ERR(dp->grf)) {
714 		DRM_DEV_ERROR(dev, "cdn-dp needs rockchip,grf property\n");
715 		return PTR_ERR(dp->grf);
716 	}
717 
718 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
719 	dp->regs = devm_ioremap_resource(dev, res);
720 	if (IS_ERR(dp->regs)) {
721 		DRM_DEV_ERROR(dev, "ioremap reg failed\n");
722 		return PTR_ERR(dp->regs);
723 	}
724 
725 	dp->core_clk = devm_clk_get(dev, "core-clk");
726 	if (IS_ERR(dp->core_clk)) {
727 		DRM_DEV_ERROR(dev, "cannot get core_clk_dp\n");
728 		return PTR_ERR(dp->core_clk);
729 	}
730 
731 	dp->pclk = devm_clk_get(dev, "pclk");
732 	if (IS_ERR(dp->pclk)) {
733 		DRM_DEV_ERROR(dev, "cannot get pclk\n");
734 		return PTR_ERR(dp->pclk);
735 	}
736 
737 	dp->spdif_clk = devm_clk_get(dev, "spdif");
738 	if (IS_ERR(dp->spdif_clk)) {
739 		DRM_DEV_ERROR(dev, "cannot get spdif_clk\n");
740 		return PTR_ERR(dp->spdif_clk);
741 	}
742 
743 	dp->grf_clk = devm_clk_get(dev, "grf");
744 	if (IS_ERR(dp->grf_clk)) {
745 		DRM_DEV_ERROR(dev, "cannot get grf clk\n");
746 		return PTR_ERR(dp->grf_clk);
747 	}
748 
749 	dp->spdif_rst = devm_reset_control_get(dev, "spdif");
750 	if (IS_ERR(dp->spdif_rst)) {
751 		DRM_DEV_ERROR(dev, "no spdif reset control found\n");
752 		return PTR_ERR(dp->spdif_rst);
753 	}
754 
755 	dp->dptx_rst = devm_reset_control_get(dev, "dptx");
756 	if (IS_ERR(dp->dptx_rst)) {
757 		DRM_DEV_ERROR(dev, "no uphy reset control found\n");
758 		return PTR_ERR(dp->dptx_rst);
759 	}
760 
761 	dp->core_rst = devm_reset_control_get(dev, "core");
762 	if (IS_ERR(dp->core_rst)) {
763 		DRM_DEV_ERROR(dev, "no core reset control found\n");
764 		return PTR_ERR(dp->core_rst);
765 	}
766 
767 	dp->apb_rst = devm_reset_control_get(dev, "apb");
768 	if (IS_ERR(dp->apb_rst)) {
769 		DRM_DEV_ERROR(dev, "no apb reset control found\n");
770 		return PTR_ERR(dp->apb_rst);
771 	}
772 
773 	return 0;
774 }
775 
776 static int cdn_dp_audio_hw_params(struct device *dev,  void *data,
777 				  struct hdmi_codec_daifmt *daifmt,
778 				  struct hdmi_codec_params *params)
779 {
780 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
781 	struct audio_info audio = {
782 		.sample_width = params->sample_width,
783 		.sample_rate = params->sample_rate,
784 		.channels = params->channels,
785 	};
786 	int ret;
787 
788 	mutex_lock(&dp->lock);
789 	if (!dp->active) {
790 		ret = -ENODEV;
791 		goto out;
792 	}
793 
794 	switch (daifmt->fmt) {
795 	case HDMI_I2S:
796 		audio.format = AFMT_I2S;
797 		break;
798 	case HDMI_SPDIF:
799 		audio.format = AFMT_SPDIF;
800 		break;
801 	default:
802 		DRM_DEV_ERROR(dev, "Invalid format %d\n", daifmt->fmt);
803 		ret = -EINVAL;
804 		goto out;
805 	}
806 
807 	ret = cdn_dp_audio_config(dp, &audio);
808 	if (!ret)
809 		dp->audio_info = audio;
810 
811 out:
812 	mutex_unlock(&dp->lock);
813 	return ret;
814 }
815 
816 static void cdn_dp_audio_shutdown(struct device *dev, void *data)
817 {
818 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
819 	int ret;
820 
821 	mutex_lock(&dp->lock);
822 	if (!dp->active)
823 		goto out;
824 
825 	ret = cdn_dp_audio_stop(dp, &dp->audio_info);
826 	if (!ret)
827 		dp->audio_info.format = AFMT_UNUSED;
828 out:
829 	mutex_unlock(&dp->lock);
830 }
831 
832 static int cdn_dp_audio_digital_mute(struct device *dev, void *data,
833 				     bool enable)
834 {
835 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
836 	int ret;
837 
838 	mutex_lock(&dp->lock);
839 	if (!dp->active) {
840 		ret = -ENODEV;
841 		goto out;
842 	}
843 
844 	ret = cdn_dp_audio_mute(dp, enable);
845 
846 out:
847 	mutex_unlock(&dp->lock);
848 	return ret;
849 }
850 
851 static int cdn_dp_audio_get_eld(struct device *dev, void *data,
852 				u8 *buf, size_t len)
853 {
854 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
855 
856 	memcpy(buf, dp->connector.eld, min(sizeof(dp->connector.eld), len));
857 
858 	return 0;
859 }
860 
861 static const struct hdmi_codec_ops audio_codec_ops = {
862 	.hw_params = cdn_dp_audio_hw_params,
863 	.audio_shutdown = cdn_dp_audio_shutdown,
864 	.digital_mute = cdn_dp_audio_digital_mute,
865 	.get_eld = cdn_dp_audio_get_eld,
866 };
867 
868 static int cdn_dp_audio_codec_init(struct cdn_dp_device *dp,
869 				   struct device *dev)
870 {
871 	struct hdmi_codec_pdata codec_data = {
872 		.i2s = 1,
873 		.spdif = 1,
874 		.ops = &audio_codec_ops,
875 		.max_i2s_channels = 8,
876 	};
877 
878 	dp->audio_pdev = platform_device_register_data(
879 			 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
880 			 &codec_data, sizeof(codec_data));
881 
882 	return PTR_ERR_OR_ZERO(dp->audio_pdev);
883 }
884 
885 static int cdn_dp_request_firmware(struct cdn_dp_device *dp)
886 {
887 	int ret;
888 	unsigned long timeout = jiffies + msecs_to_jiffies(CDN_FW_TIMEOUT_MS);
889 	unsigned long sleep = 1000;
890 
891 	WARN_ON(!mutex_is_locked(&dp->lock));
892 
893 	if (dp->fw_loaded)
894 		return 0;
895 
896 	/* Drop the lock before getting the firmware to avoid blocking boot */
897 	mutex_unlock(&dp->lock);
898 
899 	while (time_before(jiffies, timeout)) {
900 		ret = request_firmware(&dp->fw, CDN_DP_FIRMWARE, dp->dev);
901 		if (ret == -ENOENT) {
902 			msleep(sleep);
903 			sleep *= 2;
904 			continue;
905 		} else if (ret) {
906 			DRM_DEV_ERROR(dp->dev,
907 				      "failed to request firmware: %d\n", ret);
908 			goto out;
909 		}
910 
911 		dp->fw_loaded = true;
912 		ret = 0;
913 		goto out;
914 	}
915 
916 	DRM_DEV_ERROR(dp->dev, "Timed out trying to load firmware\n");
917 	ret = -ETIMEDOUT;
918 out:
919 	mutex_lock(&dp->lock);
920 	return ret;
921 }
922 
923 static void cdn_dp_pd_event_work(struct work_struct *work)
924 {
925 	struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
926 						event_work);
927 	struct drm_connector *connector = &dp->connector;
928 	enum drm_connector_status old_status;
929 
930 	int ret;
931 
932 	mutex_lock(&dp->lock);
933 
934 	if (dp->suspended)
935 		goto out;
936 
937 	ret = cdn_dp_request_firmware(dp);
938 	if (ret)
939 		goto out;
940 
941 	dp->connected = true;
942 
943 	/* Not connected, notify userspace to disable the block */
944 	if (!cdn_dp_connected_port(dp)) {
945 		DRM_DEV_INFO(dp->dev, "Not connected. Disabling cdn\n");
946 		dp->connected = false;
947 
948 	/* Connected but not enabled, enable the block */
949 	} else if (!dp->active) {
950 		DRM_DEV_INFO(dp->dev, "Connected, not enabled. Enabling cdn\n");
951 		ret = cdn_dp_enable(dp);
952 		if (ret) {
953 			DRM_DEV_ERROR(dp->dev, "Enable dp failed %d\n", ret);
954 			dp->connected = false;
955 		}
956 
957 	/* Enabled and connected to a dongle without a sink, notify userspace */
958 	} else if (!cdn_dp_check_sink_connection(dp)) {
959 		DRM_DEV_INFO(dp->dev, "Connected without sink. Assert hpd\n");
960 		dp->connected = false;
961 
962 	/* Enabled and connected with a sink, re-train if requested */
963 	} else if (!cdn_dp_check_link_status(dp)) {
964 		unsigned int rate = dp->link.rate;
965 		unsigned int lanes = dp->link.num_lanes;
966 		struct drm_display_mode *mode = &dp->mode;
967 
968 		DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
969 		ret = cdn_dp_train_link(dp);
970 		if (ret) {
971 			dp->connected = false;
972 			DRM_DEV_ERROR(dp->dev, "Train link failed %d\n", ret);
973 			goto out;
974 		}
975 
976 		/* If training result is changed, update the video config */
977 		if (mode->clock &&
978 		    (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
979 			ret = cdn_dp_config_video(dp);
980 			if (ret) {
981 				dp->connected = false;
982 				DRM_DEV_ERROR(dp->dev,
983 					      "Failed to config video %d\n",
984 					      ret);
985 			}
986 		}
987 	}
988 
989 out:
990 	mutex_unlock(&dp->lock);
991 
992 	old_status = connector->status;
993 	connector->status = connector->funcs->detect(connector, false);
994 	if (old_status != connector->status)
995 		drm_kms_helper_hotplug_event(dp->drm_dev);
996 }
997 
998 static int cdn_dp_pd_event(struct notifier_block *nb,
999 			   unsigned long event, void *priv)
1000 {
1001 	struct cdn_dp_port *port = container_of(nb, struct cdn_dp_port,
1002 						event_nb);
1003 	struct cdn_dp_device *dp = port->dp;
1004 
1005 	/*
1006 	 * It would be nice to be able to just do the work inline right here.
1007 	 * However, we need to make a bunch of calls that might sleep in order
1008 	 * to turn on the block/phy, so use a worker instead.
1009 	 */
1010 	schedule_work(&dp->event_work);
1011 
1012 	return NOTIFY_DONE;
1013 }
1014 
1015 static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
1016 {
1017 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1018 	struct drm_encoder *encoder;
1019 	struct drm_connector *connector;
1020 	struct cdn_dp_port *port;
1021 	struct drm_device *drm_dev = data;
1022 	int ret, i;
1023 
1024 	ret = cdn_dp_parse_dt(dp);
1025 	if (ret < 0)
1026 		return ret;
1027 
1028 	dp->drm_dev = drm_dev;
1029 	dp->connected = false;
1030 	dp->active = false;
1031 	dp->active_port = -1;
1032 	dp->fw_loaded = false;
1033 
1034 	INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
1035 
1036 	encoder = &dp->encoder;
1037 
1038 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
1039 							     dev->of_node);
1040 	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
1041 
1042 	ret = drm_encoder_init(drm_dev, encoder, &cdn_dp_encoder_funcs,
1043 			       DRM_MODE_ENCODER_TMDS, NULL);
1044 	if (ret) {
1045 		DRM_ERROR("failed to initialize encoder with drm\n");
1046 		return ret;
1047 	}
1048 
1049 	drm_encoder_helper_add(encoder, &cdn_dp_encoder_helper_funcs);
1050 
1051 	connector = &dp->connector;
1052 	connector->polled = DRM_CONNECTOR_POLL_HPD;
1053 	connector->dpms = DRM_MODE_DPMS_OFF;
1054 
1055 	ret = drm_connector_init(drm_dev, connector,
1056 				 &cdn_dp_atomic_connector_funcs,
1057 				 DRM_MODE_CONNECTOR_DisplayPort);
1058 	if (ret) {
1059 		DRM_ERROR("failed to initialize connector with drm\n");
1060 		goto err_free_encoder;
1061 	}
1062 
1063 	drm_connector_helper_add(connector, &cdn_dp_connector_helper_funcs);
1064 
1065 	ret = drm_connector_attach_encoder(connector, encoder);
1066 	if (ret) {
1067 		DRM_ERROR("failed to attach connector and encoder\n");
1068 		goto err_free_connector;
1069 	}
1070 
1071 	for (i = 0; i < dp->ports; i++) {
1072 		port = dp->port[i];
1073 
1074 		port->event_nb.notifier_call = cdn_dp_pd_event;
1075 		ret = devm_extcon_register_notifier(dp->dev, port->extcon,
1076 						    EXTCON_DISP_DP,
1077 						    &port->event_nb);
1078 		if (ret) {
1079 			DRM_DEV_ERROR(dev,
1080 				      "register EXTCON_DISP_DP notifier err\n");
1081 			goto err_free_connector;
1082 		}
1083 	}
1084 
1085 	pm_runtime_enable(dev);
1086 
1087 	schedule_work(&dp->event_work);
1088 
1089 	return 0;
1090 
1091 err_free_connector:
1092 	drm_connector_cleanup(connector);
1093 err_free_encoder:
1094 	drm_encoder_cleanup(encoder);
1095 	return ret;
1096 }
1097 
1098 static void cdn_dp_unbind(struct device *dev, struct device *master, void *data)
1099 {
1100 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1101 	struct drm_encoder *encoder = &dp->encoder;
1102 	struct drm_connector *connector = &dp->connector;
1103 
1104 	cancel_work_sync(&dp->event_work);
1105 	cdn_dp_encoder_disable(encoder);
1106 	encoder->funcs->destroy(encoder);
1107 	connector->funcs->destroy(connector);
1108 
1109 	pm_runtime_disable(dev);
1110 	if (dp->fw_loaded)
1111 		release_firmware(dp->fw);
1112 	kfree(dp->edid);
1113 	dp->edid = NULL;
1114 }
1115 
1116 static const struct component_ops cdn_dp_component_ops = {
1117 	.bind = cdn_dp_bind,
1118 	.unbind = cdn_dp_unbind,
1119 };
1120 
1121 int cdn_dp_suspend(struct device *dev)
1122 {
1123 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1124 	int ret = 0;
1125 
1126 	mutex_lock(&dp->lock);
1127 	if (dp->active)
1128 		ret = cdn_dp_disable(dp);
1129 	dp->suspended = true;
1130 	mutex_unlock(&dp->lock);
1131 
1132 	return ret;
1133 }
1134 
1135 int cdn_dp_resume(struct device *dev)
1136 {
1137 	struct cdn_dp_device *dp = dev_get_drvdata(dev);
1138 
1139 	mutex_lock(&dp->lock);
1140 	dp->suspended = false;
1141 	if (dp->fw_loaded)
1142 		schedule_work(&dp->event_work);
1143 	mutex_unlock(&dp->lock);
1144 
1145 	return 0;
1146 }
1147 
1148 static int cdn_dp_probe(struct platform_device *pdev)
1149 {
1150 	struct device *dev = &pdev->dev;
1151 	const struct of_device_id *match;
1152 	struct cdn_dp_data *dp_data;
1153 	struct cdn_dp_port *port;
1154 	struct cdn_dp_device *dp;
1155 	struct extcon_dev *extcon;
1156 	struct phy *phy;
1157 	int i;
1158 
1159 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
1160 	if (!dp)
1161 		return -ENOMEM;
1162 	dp->dev = dev;
1163 
1164 	match = of_match_node(cdn_dp_dt_ids, pdev->dev.of_node);
1165 	dp_data = (struct cdn_dp_data *)match->data;
1166 
1167 	for (i = 0; i < dp_data->max_phy; i++) {
1168 		extcon = extcon_get_edev_by_phandle(dev, i);
1169 		phy = devm_of_phy_get_by_index(dev, dev->of_node, i);
1170 
1171 		if (PTR_ERR(extcon) == -EPROBE_DEFER ||
1172 		    PTR_ERR(phy) == -EPROBE_DEFER)
1173 			return -EPROBE_DEFER;
1174 
1175 		if (IS_ERR(extcon) || IS_ERR(phy))
1176 			continue;
1177 
1178 		port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
1179 		if (!port)
1180 			return -ENOMEM;
1181 
1182 		port->extcon = extcon;
1183 		port->phy = phy;
1184 		port->dp = dp;
1185 		port->id = i;
1186 		dp->port[dp->ports++] = port;
1187 	}
1188 
1189 	if (!dp->ports) {
1190 		DRM_DEV_ERROR(dev, "missing extcon or phy\n");
1191 		return -EINVAL;
1192 	}
1193 
1194 	mutex_init(&dp->lock);
1195 	dev_set_drvdata(dev, dp);
1196 
1197 	cdn_dp_audio_codec_init(dp, dev);
1198 
1199 	return component_add(dev, &cdn_dp_component_ops);
1200 }
1201 
1202 static int cdn_dp_remove(struct platform_device *pdev)
1203 {
1204 	struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1205 
1206 	platform_device_unregister(dp->audio_pdev);
1207 	cdn_dp_suspend(dp->dev);
1208 	component_del(&pdev->dev, &cdn_dp_component_ops);
1209 
1210 	return 0;
1211 }
1212 
1213 static void cdn_dp_shutdown(struct platform_device *pdev)
1214 {
1215 	struct cdn_dp_device *dp = platform_get_drvdata(pdev);
1216 
1217 	cdn_dp_suspend(dp->dev);
1218 }
1219 
1220 static const struct dev_pm_ops cdn_dp_pm_ops = {
1221 	SET_SYSTEM_SLEEP_PM_OPS(cdn_dp_suspend,
1222 				cdn_dp_resume)
1223 };
1224 
1225 struct platform_driver cdn_dp_driver = {
1226 	.probe = cdn_dp_probe,
1227 	.remove = cdn_dp_remove,
1228 	.shutdown = cdn_dp_shutdown,
1229 	.driver = {
1230 		   .name = "cdn-dp",
1231 		   .owner = THIS_MODULE,
1232 		   .of_match_table = of_match_ptr(cdn_dp_dt_ids),
1233 		   .pm = &cdn_dp_pm_ops,
1234 	},
1235 };
1236