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