1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HDMI interface DSS driver for TI's OMAP4 family of SoCs.
4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com/
5  * Authors: Yong Zhi
6  *	Mythri pk <mythripk@ti.com>
7  */
8 
9 #define DSS_SUBSYS_NAME "HDMI"
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/io.h>
15 #include <linux/interrupt.h>
16 #include <linux/mutex.h>
17 #include <linux/delay.h>
18 #include <linux/string.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/clk.h>
22 #include <linux/of.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/component.h>
25 #include <video/omapfb_dss.h>
26 #include <sound/omap-hdmi-audio.h>
27 
28 #include "hdmi4_core.h"
29 #include "dss.h"
30 #include "dss_features.h"
31 #include "hdmi.h"
32 
33 static struct omap_hdmi hdmi;
34 
35 static int hdmi_runtime_get(void)
36 {
37 	int r;
38 
39 	DSSDBG("hdmi_runtime_get\n");
40 
41 	r = pm_runtime_get_sync(&hdmi.pdev->dev);
42 	if (WARN_ON(r < 0)) {
43 		pm_runtime_put_sync(&hdmi.pdev->dev);
44 		return r;
45 	}
46 
47 	return 0;
48 }
49 
50 static void hdmi_runtime_put(void)
51 {
52 	int r;
53 
54 	DSSDBG("hdmi_runtime_put\n");
55 
56 	r = pm_runtime_put_sync(&hdmi.pdev->dev);
57 	WARN_ON(r < 0 && r != -ENOSYS);
58 }
59 
60 static irqreturn_t hdmi_irq_handler(int irq, void *data)
61 {
62 	struct hdmi_wp_data *wp = data;
63 	u32 irqstatus;
64 
65 	irqstatus = hdmi_wp_get_irqstatus(wp);
66 	hdmi_wp_set_irqstatus(wp, irqstatus);
67 
68 	if ((irqstatus & HDMI_IRQ_LINK_CONNECT) &&
69 			irqstatus & HDMI_IRQ_LINK_DISCONNECT) {
70 		/*
71 		 * If we get both connect and disconnect interrupts at the same
72 		 * time, turn off the PHY, clear interrupts, and restart, which
73 		 * raises connect interrupt if a cable is connected, or nothing
74 		 * if cable is not connected.
75 		 */
76 		hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_OFF);
77 
78 		hdmi_wp_set_irqstatus(wp, HDMI_IRQ_LINK_CONNECT |
79 				HDMI_IRQ_LINK_DISCONNECT);
80 
81 		hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
82 	} else if (irqstatus & HDMI_IRQ_LINK_CONNECT) {
83 		hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_TXON);
84 	} else if (irqstatus & HDMI_IRQ_LINK_DISCONNECT) {
85 		hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
86 	}
87 
88 	return IRQ_HANDLED;
89 }
90 
91 static int hdmi_init_regulator(void)
92 {
93 	struct regulator *reg;
94 
95 	if (hdmi.vdda_reg != NULL)
96 		return 0;
97 
98 	reg = devm_regulator_get(&hdmi.pdev->dev, "vdda");
99 
100 	if (IS_ERR(reg)) {
101 		if (PTR_ERR(reg) != -EPROBE_DEFER)
102 			DSSERR("can't get VDDA regulator\n");
103 		return PTR_ERR(reg);
104 	}
105 
106 	hdmi.vdda_reg = reg;
107 
108 	return 0;
109 }
110 
111 static int hdmi_power_on_core(struct omap_dss_device *dssdev)
112 {
113 	int r;
114 
115 	r = regulator_enable(hdmi.vdda_reg);
116 	if (r)
117 		return r;
118 
119 	r = hdmi_runtime_get();
120 	if (r)
121 		goto err_runtime_get;
122 
123 	/* Make selection of HDMI in DSS */
124 	dss_select_hdmi_venc_clk_source(DSS_HDMI_M_PCLK);
125 
126 	hdmi.core_enabled = true;
127 
128 	return 0;
129 
130 err_runtime_get:
131 	regulator_disable(hdmi.vdda_reg);
132 
133 	return r;
134 }
135 
136 static void hdmi_power_off_core(struct omap_dss_device *dssdev)
137 {
138 	hdmi.core_enabled = false;
139 
140 	hdmi_runtime_put();
141 	regulator_disable(hdmi.vdda_reg);
142 }
143 
144 static int hdmi_power_on_full(struct omap_dss_device *dssdev)
145 {
146 	int r;
147 	struct omap_video_timings *p;
148 	struct omap_overlay_manager *mgr = hdmi.output.manager;
149 	struct hdmi_wp_data *wp = &hdmi.wp;
150 	struct dss_pll_clock_info hdmi_cinfo = { 0 };
151 
152 	r = hdmi_power_on_core(dssdev);
153 	if (r)
154 		return r;
155 
156 	/* disable and clear irqs */
157 	hdmi_wp_clear_irqenable(wp, 0xffffffff);
158 	hdmi_wp_set_irqstatus(wp, 0xffffffff);
159 
160 	p = &hdmi.cfg.timings;
161 
162 	DSSDBG("hdmi_power_on x_res= %d y_res = %d\n", p->x_res, p->y_res);
163 
164 	hdmi_pll_compute(&hdmi.pll, p->pixelclock, &hdmi_cinfo);
165 
166 	r = dss_pll_enable(&hdmi.pll.pll);
167 	if (r) {
168 		DSSERR("Failed to enable PLL\n");
169 		goto err_pll_enable;
170 	}
171 
172 	r = dss_pll_set_config(&hdmi.pll.pll, &hdmi_cinfo);
173 	if (r) {
174 		DSSERR("Failed to configure PLL\n");
175 		goto err_pll_cfg;
176 	}
177 
178 	r = hdmi_phy_configure(&hdmi.phy, hdmi_cinfo.clkdco,
179 		hdmi_cinfo.clkout[0]);
180 	if (r) {
181 		DSSDBG("Failed to configure PHY\n");
182 		goto err_phy_cfg;
183 	}
184 
185 	r = hdmi_wp_set_phy_pwr(wp, HDMI_PHYPWRCMD_LDOON);
186 	if (r)
187 		goto err_phy_pwr;
188 
189 	hdmi4_configure(&hdmi.core, &hdmi.wp, &hdmi.cfg);
190 
191 	/* bypass TV gamma table */
192 	dispc_enable_gamma_table(0);
193 
194 	/* tv size */
195 	dss_mgr_set_timings(mgr, p);
196 
197 	r = hdmi_wp_video_start(&hdmi.wp);
198 	if (r)
199 		goto err_vid_enable;
200 
201 	r = dss_mgr_enable(mgr);
202 	if (r)
203 		goto err_mgr_enable;
204 
205 	hdmi_wp_set_irqenable(wp,
206 		HDMI_IRQ_LINK_CONNECT | HDMI_IRQ_LINK_DISCONNECT);
207 
208 	return 0;
209 
210 err_mgr_enable:
211 	hdmi_wp_video_stop(&hdmi.wp);
212 err_vid_enable:
213 	hdmi_wp_set_phy_pwr(&hdmi.wp, HDMI_PHYPWRCMD_OFF);
214 err_phy_pwr:
215 err_phy_cfg:
216 err_pll_cfg:
217 	dss_pll_disable(&hdmi.pll.pll);
218 err_pll_enable:
219 	hdmi_power_off_core(dssdev);
220 	return -EIO;
221 }
222 
223 static void hdmi_power_off_full(struct omap_dss_device *dssdev)
224 {
225 	struct omap_overlay_manager *mgr = hdmi.output.manager;
226 
227 	hdmi_wp_clear_irqenable(&hdmi.wp, 0xffffffff);
228 
229 	dss_mgr_disable(mgr);
230 
231 	hdmi_wp_video_stop(&hdmi.wp);
232 
233 	hdmi_wp_set_phy_pwr(&hdmi.wp, HDMI_PHYPWRCMD_OFF);
234 
235 	dss_pll_disable(&hdmi.pll.pll);
236 
237 	hdmi_power_off_core(dssdev);
238 }
239 
240 static int hdmi_display_check_timing(struct omap_dss_device *dssdev,
241 					struct omap_video_timings *timings)
242 {
243 	struct omap_dss_device *out = &hdmi.output;
244 
245 	if (!dispc_mgr_timings_ok(out->dispc_channel, timings))
246 		return -EINVAL;
247 
248 	return 0;
249 }
250 
251 static void hdmi_display_set_timing(struct omap_dss_device *dssdev,
252 		struct omap_video_timings *timings)
253 {
254 	mutex_lock(&hdmi.lock);
255 
256 	hdmi.cfg.timings = *timings;
257 
258 	dispc_set_tv_pclk(timings->pixelclock);
259 
260 	mutex_unlock(&hdmi.lock);
261 }
262 
263 static void hdmi_display_get_timings(struct omap_dss_device *dssdev,
264 		struct omap_video_timings *timings)
265 {
266 	*timings = hdmi.cfg.timings;
267 }
268 
269 static void hdmi_dump_regs(struct seq_file *s)
270 {
271 	mutex_lock(&hdmi.lock);
272 
273 	if (hdmi_runtime_get()) {
274 		mutex_unlock(&hdmi.lock);
275 		return;
276 	}
277 
278 	hdmi_wp_dump(&hdmi.wp, s);
279 	hdmi_pll_dump(&hdmi.pll, s);
280 	hdmi_phy_dump(&hdmi.phy, s);
281 	hdmi4_core_dump(&hdmi.core, s);
282 
283 	hdmi_runtime_put();
284 	mutex_unlock(&hdmi.lock);
285 }
286 
287 static int read_edid(u8 *buf, int len)
288 {
289 	int r;
290 
291 	mutex_lock(&hdmi.lock);
292 
293 	r = hdmi_runtime_get();
294 	BUG_ON(r);
295 
296 	r = hdmi4_read_edid(&hdmi.core,  buf, len);
297 
298 	hdmi_runtime_put();
299 	mutex_unlock(&hdmi.lock);
300 
301 	return r;
302 }
303 
304 static void hdmi_start_audio_stream(struct omap_hdmi *hd)
305 {
306 	hdmi_wp_audio_enable(&hd->wp, true);
307 	hdmi4_audio_start(&hd->core, &hd->wp);
308 }
309 
310 static void hdmi_stop_audio_stream(struct omap_hdmi *hd)
311 {
312 	hdmi4_audio_stop(&hd->core, &hd->wp);
313 	hdmi_wp_audio_enable(&hd->wp, false);
314 }
315 
316 static int hdmi_display_enable(struct omap_dss_device *dssdev)
317 {
318 	struct omap_dss_device *out = &hdmi.output;
319 	unsigned long flags;
320 	int r = 0;
321 
322 	DSSDBG("ENTER hdmi_display_enable\n");
323 
324 	mutex_lock(&hdmi.lock);
325 
326 	if (out->manager == NULL) {
327 		DSSERR("failed to enable display: no output/manager\n");
328 		r = -ENODEV;
329 		goto err0;
330 	}
331 
332 	r = hdmi_power_on_full(dssdev);
333 	if (r) {
334 		DSSERR("failed to power on device\n");
335 		goto err0;
336 	}
337 
338 	if (hdmi.audio_configured) {
339 		r = hdmi4_audio_config(&hdmi.core, &hdmi.wp, &hdmi.audio_config,
340 				       hdmi.cfg.timings.pixelclock);
341 		if (r) {
342 			DSSERR("Error restoring audio configuration: %d", r);
343 			hdmi.audio_abort_cb(&hdmi.pdev->dev);
344 			hdmi.audio_configured = false;
345 		}
346 	}
347 
348 	spin_lock_irqsave(&hdmi.audio_playing_lock, flags);
349 	if (hdmi.audio_configured && hdmi.audio_playing)
350 		hdmi_start_audio_stream(&hdmi);
351 	hdmi.display_enabled = true;
352 	spin_unlock_irqrestore(&hdmi.audio_playing_lock, flags);
353 
354 	mutex_unlock(&hdmi.lock);
355 	return 0;
356 
357 err0:
358 	mutex_unlock(&hdmi.lock);
359 	return r;
360 }
361 
362 static void hdmi_display_disable(struct omap_dss_device *dssdev)
363 {
364 	unsigned long flags;
365 
366 	DSSDBG("Enter hdmi_display_disable\n");
367 
368 	mutex_lock(&hdmi.lock);
369 
370 	spin_lock_irqsave(&hdmi.audio_playing_lock, flags);
371 	hdmi_stop_audio_stream(&hdmi);
372 	hdmi.display_enabled = false;
373 	spin_unlock_irqrestore(&hdmi.audio_playing_lock, flags);
374 
375 	hdmi_power_off_full(dssdev);
376 
377 	mutex_unlock(&hdmi.lock);
378 }
379 
380 static int hdmi_core_enable(struct omap_dss_device *dssdev)
381 {
382 	int r = 0;
383 
384 	DSSDBG("ENTER omapdss_hdmi_core_enable\n");
385 
386 	mutex_lock(&hdmi.lock);
387 
388 	r = hdmi_power_on_core(dssdev);
389 	if (r) {
390 		DSSERR("failed to power on device\n");
391 		goto err0;
392 	}
393 
394 	mutex_unlock(&hdmi.lock);
395 	return 0;
396 
397 err0:
398 	mutex_unlock(&hdmi.lock);
399 	return r;
400 }
401 
402 static void hdmi_core_disable(struct omap_dss_device *dssdev)
403 {
404 	DSSDBG("Enter omapdss_hdmi_core_disable\n");
405 
406 	mutex_lock(&hdmi.lock);
407 
408 	hdmi_power_off_core(dssdev);
409 
410 	mutex_unlock(&hdmi.lock);
411 }
412 
413 static int hdmi_connect(struct omap_dss_device *dssdev,
414 		struct omap_dss_device *dst)
415 {
416 	struct omap_overlay_manager *mgr;
417 	int r;
418 
419 	r = hdmi_init_regulator();
420 	if (r)
421 		return r;
422 
423 	mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
424 	if (!mgr)
425 		return -ENODEV;
426 
427 	r = dss_mgr_connect(mgr, dssdev);
428 	if (r)
429 		return r;
430 
431 	r = omapdss_output_set_device(dssdev, dst);
432 	if (r) {
433 		DSSERR("failed to connect output to new device: %s\n",
434 				dst->name);
435 		dss_mgr_disconnect(mgr, dssdev);
436 		return r;
437 	}
438 
439 	return 0;
440 }
441 
442 static void hdmi_disconnect(struct omap_dss_device *dssdev,
443 		struct omap_dss_device *dst)
444 {
445 	WARN_ON(dst != dssdev->dst);
446 
447 	if (dst != dssdev->dst)
448 		return;
449 
450 	omapdss_output_unset_device(dssdev);
451 
452 	if (dssdev->manager)
453 		dss_mgr_disconnect(dssdev->manager, dssdev);
454 }
455 
456 static int hdmi_read_edid(struct omap_dss_device *dssdev,
457 		u8 *edid, int len)
458 {
459 	bool need_enable = !hdmi.core_enabled;
460 	int r;
461 
462 	if (need_enable) {
463 		r = hdmi_core_enable(dssdev);
464 		if (r)
465 			return r;
466 	}
467 
468 	r = read_edid(edid, len);
469 
470 	if (need_enable)
471 		hdmi_core_disable(dssdev);
472 
473 	return r;
474 }
475 
476 static int hdmi_set_infoframe(struct omap_dss_device *dssdev,
477 		const struct hdmi_avi_infoframe *avi)
478 {
479 	hdmi.cfg.infoframe = *avi;
480 	return 0;
481 }
482 
483 static int hdmi_set_hdmi_mode(struct omap_dss_device *dssdev,
484 		bool hdmi_mode)
485 {
486 	hdmi.cfg.hdmi_dvi_mode = hdmi_mode ? HDMI_HDMI : HDMI_DVI;
487 	return 0;
488 }
489 
490 static const struct omapdss_hdmi_ops hdmi_ops = {
491 	.connect		= hdmi_connect,
492 	.disconnect		= hdmi_disconnect,
493 
494 	.enable			= hdmi_display_enable,
495 	.disable		= hdmi_display_disable,
496 
497 	.check_timings		= hdmi_display_check_timing,
498 	.set_timings		= hdmi_display_set_timing,
499 	.get_timings		= hdmi_display_get_timings,
500 
501 	.read_edid		= hdmi_read_edid,
502 	.set_infoframe		= hdmi_set_infoframe,
503 	.set_hdmi_mode		= hdmi_set_hdmi_mode,
504 };
505 
506 static void hdmi_init_output(struct platform_device *pdev)
507 {
508 	struct omap_dss_device *out = &hdmi.output;
509 
510 	out->dev = &pdev->dev;
511 	out->id = OMAP_DSS_OUTPUT_HDMI;
512 	out->output_type = OMAP_DISPLAY_TYPE_HDMI;
513 	out->name = "hdmi.0";
514 	out->dispc_channel = OMAP_DSS_CHANNEL_DIGIT;
515 	out->ops.hdmi = &hdmi_ops;
516 	out->owner = THIS_MODULE;
517 
518 	omapdss_register_output(out);
519 }
520 
521 static void hdmi_uninit_output(struct platform_device *pdev)
522 {
523 	struct omap_dss_device *out = &hdmi.output;
524 
525 	omapdss_unregister_output(out);
526 }
527 
528 static int hdmi_probe_of(struct platform_device *pdev)
529 {
530 	struct device_node *node = pdev->dev.of_node;
531 	struct device_node *ep;
532 	int r;
533 
534 	ep = omapdss_of_get_first_endpoint(node);
535 	if (!ep)
536 		return 0;
537 
538 	r = hdmi_parse_lanes_of(pdev, ep, &hdmi.phy);
539 	if (r)
540 		goto err;
541 
542 	of_node_put(ep);
543 	return 0;
544 
545 err:
546 	of_node_put(ep);
547 	return r;
548 }
549 
550 /* Audio callbacks */
551 static int hdmi_audio_startup(struct device *dev,
552 			      void (*abort_cb)(struct device *dev))
553 {
554 	struct omap_hdmi *hd = dev_get_drvdata(dev);
555 	int ret = 0;
556 
557 	mutex_lock(&hd->lock);
558 
559 	if (!hdmi_mode_has_audio(&hd->cfg) || !hd->display_enabled) {
560 		ret = -EPERM;
561 		goto out;
562 	}
563 
564 	hd->audio_abort_cb = abort_cb;
565 
566 out:
567 	mutex_unlock(&hd->lock);
568 
569 	return ret;
570 }
571 
572 static int hdmi_audio_shutdown(struct device *dev)
573 {
574 	struct omap_hdmi *hd = dev_get_drvdata(dev);
575 
576 	mutex_lock(&hd->lock);
577 	hd->audio_abort_cb = NULL;
578 	hd->audio_configured = false;
579 	hd->audio_playing = false;
580 	mutex_unlock(&hd->lock);
581 
582 	return 0;
583 }
584 
585 static int hdmi_audio_start(struct device *dev)
586 {
587 	struct omap_hdmi *hd = dev_get_drvdata(dev);
588 	unsigned long flags;
589 
590 	WARN_ON(!hdmi_mode_has_audio(&hd->cfg));
591 
592 	spin_lock_irqsave(&hd->audio_playing_lock, flags);
593 
594 	if (hd->display_enabled)
595 		hdmi_start_audio_stream(hd);
596 	hd->audio_playing = true;
597 
598 	spin_unlock_irqrestore(&hd->audio_playing_lock, flags);
599 	return 0;
600 }
601 
602 static void hdmi_audio_stop(struct device *dev)
603 {
604 	struct omap_hdmi *hd = dev_get_drvdata(dev);
605 	unsigned long flags;
606 
607 	WARN_ON(!hdmi_mode_has_audio(&hd->cfg));
608 
609 	spin_lock_irqsave(&hd->audio_playing_lock, flags);
610 
611 	if (hd->display_enabled)
612 		hdmi_stop_audio_stream(hd);
613 	hd->audio_playing = false;
614 
615 	spin_unlock_irqrestore(&hd->audio_playing_lock, flags);
616 }
617 
618 static int hdmi_audio_config(struct device *dev,
619 			     struct omap_dss_audio *dss_audio)
620 {
621 	struct omap_hdmi *hd = dev_get_drvdata(dev);
622 	int ret;
623 
624 	mutex_lock(&hd->lock);
625 
626 	if (!hdmi_mode_has_audio(&hd->cfg) || !hd->display_enabled) {
627 		ret = -EPERM;
628 		goto out;
629 	}
630 
631 	ret = hdmi4_audio_config(&hd->core, &hd->wp, dss_audio,
632 				 hd->cfg.timings.pixelclock);
633 	if (!ret) {
634 		hd->audio_configured = true;
635 		hd->audio_config = *dss_audio;
636 	}
637 out:
638 	mutex_unlock(&hd->lock);
639 
640 	return ret;
641 }
642 
643 static const struct omap_hdmi_audio_ops hdmi_audio_ops = {
644 	.audio_startup = hdmi_audio_startup,
645 	.audio_shutdown = hdmi_audio_shutdown,
646 	.audio_start = hdmi_audio_start,
647 	.audio_stop = hdmi_audio_stop,
648 	.audio_config = hdmi_audio_config,
649 };
650 
651 static int hdmi_audio_register(struct device *dev)
652 {
653 	struct omap_hdmi_audio_pdata pdata = {
654 		.dev = dev,
655 		.version = 4,
656 		.audio_dma_addr = hdmi_wp_get_audio_dma_addr(&hdmi.wp),
657 		.ops = &hdmi_audio_ops,
658 	};
659 
660 	hdmi.audio_pdev = platform_device_register_data(
661 		dev, "omap-hdmi-audio", PLATFORM_DEVID_AUTO,
662 		&pdata, sizeof(pdata));
663 
664 	return PTR_ERR_OR_ZERO(hdmi.audio_pdev);
665 }
666 
667 /* HDMI HW IP initialisation */
668 static int hdmi4_bind(struct device *dev, struct device *master, void *data)
669 {
670 	struct platform_device *pdev = to_platform_device(dev);
671 	int r;
672 	int irq;
673 
674 	hdmi.pdev = pdev;
675 	dev_set_drvdata(&pdev->dev, &hdmi);
676 
677 	mutex_init(&hdmi.lock);
678 	spin_lock_init(&hdmi.audio_playing_lock);
679 
680 	if (pdev->dev.of_node) {
681 		r = hdmi_probe_of(pdev);
682 		if (r)
683 			return r;
684 	}
685 
686 	r = hdmi_wp_init(pdev, &hdmi.wp);
687 	if (r)
688 		return r;
689 
690 	r = hdmi_pll_init(pdev, &hdmi.pll, &hdmi.wp);
691 	if (r)
692 		return r;
693 
694 	r = hdmi_phy_init(pdev, &hdmi.phy);
695 	if (r)
696 		goto err;
697 
698 	r = hdmi4_core_init(pdev, &hdmi.core);
699 	if (r)
700 		goto err;
701 
702 	irq = platform_get_irq(pdev, 0);
703 	if (irq < 0) {
704 		DSSERR("platform_get_irq failed\n");
705 		r = -ENODEV;
706 		goto err;
707 	}
708 
709 	r = devm_request_threaded_irq(&pdev->dev, irq,
710 			NULL, hdmi_irq_handler,
711 			IRQF_ONESHOT, "OMAP HDMI", &hdmi.wp);
712 	if (r) {
713 		DSSERR("HDMI IRQ request failed\n");
714 		goto err;
715 	}
716 
717 	pm_runtime_enable(&pdev->dev);
718 
719 	hdmi_init_output(pdev);
720 
721 	r = hdmi_audio_register(&pdev->dev);
722 	if (r) {
723 		DSSERR("Registering HDMI audio failed\n");
724 		hdmi_uninit_output(pdev);
725 		pm_runtime_disable(&pdev->dev);
726 		return r;
727 	}
728 
729 	dss_debugfs_create_file("hdmi", hdmi_dump_regs);
730 
731 	return 0;
732 err:
733 	hdmi_pll_uninit(&hdmi.pll);
734 	return r;
735 }
736 
737 static void hdmi4_unbind(struct device *dev, struct device *master, void *data)
738 {
739 	struct platform_device *pdev = to_platform_device(dev);
740 
741 	if (hdmi.audio_pdev)
742 		platform_device_unregister(hdmi.audio_pdev);
743 
744 	hdmi_uninit_output(pdev);
745 
746 	hdmi_pll_uninit(&hdmi.pll);
747 
748 	pm_runtime_disable(&pdev->dev);
749 }
750 
751 static const struct component_ops hdmi4_component_ops = {
752 	.bind	= hdmi4_bind,
753 	.unbind	= hdmi4_unbind,
754 };
755 
756 static int hdmi4_probe(struct platform_device *pdev)
757 {
758 	return component_add(&pdev->dev, &hdmi4_component_ops);
759 }
760 
761 static int hdmi4_remove(struct platform_device *pdev)
762 {
763 	component_del(&pdev->dev, &hdmi4_component_ops);
764 	return 0;
765 }
766 
767 static int hdmi_runtime_suspend(struct device *dev)
768 {
769 	dispc_runtime_put();
770 
771 	return 0;
772 }
773 
774 static int hdmi_runtime_resume(struct device *dev)
775 {
776 	int r;
777 
778 	r = dispc_runtime_get();
779 	if (r < 0)
780 		return r;
781 
782 	return 0;
783 }
784 
785 static const struct dev_pm_ops hdmi_pm_ops = {
786 	.runtime_suspend = hdmi_runtime_suspend,
787 	.runtime_resume = hdmi_runtime_resume,
788 };
789 
790 static const struct of_device_id hdmi_of_match[] = {
791 	{ .compatible = "ti,omap4-hdmi", },
792 	{},
793 };
794 
795 static struct platform_driver omapdss_hdmihw_driver = {
796 	.probe		= hdmi4_probe,
797 	.remove		= hdmi4_remove,
798 	.driver         = {
799 		.name   = "omapdss_hdmi",
800 		.pm	= &hdmi_pm_ops,
801 		.of_match_table = hdmi_of_match,
802 		.suppress_bind_attrs = true,
803 	},
804 };
805 
806 int __init hdmi4_init_platform_driver(void)
807 {
808 	return platform_driver_register(&omapdss_hdmihw_driver);
809 }
810 
811 void hdmi4_uninit_platform_driver(void)
812 {
813 	platform_driver_unregister(&omapdss_hdmihw_driver);
814 }
815